DC-DC boost system, control circuit, control chip and control method

Abstract

The invention discloses a DC-DC boost system, a control circuit, a control chip and a control method. The system comprises a power supply conversion module and a boost control module. And the power conversion module is used for accessing a first direct-current power supply and converting the first direct-current power supply into a second direct-current power supply to be output under the action of the boost control module. The boost control module comprises a first boost control chip and a second boost control chip. Unified conduction and cut-off of the internal switch tubes are controlled through the plurality of boost control chips connected in parallel, and the first direct-current power supply is converted into the second direct-current power supply in cooperation with the power supply conversion module, so that a boost function is realized. Part of chips work in the slave mode, circuit elements are reduced, and the design is simplified. Multiple chips are connected in parallel, power devices are dispersed, and the heat dissipation effect of the system is improved. The structures of the chips are the same, so that the design difficulty of the chips is reduced; in addition, the chip combination can be flexibly configured according to the load requirement, the output capacity is easily adjusted, and various complex application scenes can be adapted.

Description

Technical Field

[0001] The present invention relates to the technical field of power management, and in particular to a DC-DC boost system, a control circuit, a control chip and a control method. Background Art

[0002] In the field of power management technology for electronic devices, DC-DC (Direct Current-Direct Current Converter) boost chips are widely used. However, existing DC-DC boost chips have some significant limitations in practical applications.

[0003] Usually, after the design of the DC-DC boost chip is completed, its maximum load capacity is fixed. This fixed maximum load capacity is often subject to dual constraints of cost and system thermal design. From a cost perspective, in order to increase the load capacity of the chip, more circuit elements and more complex designs need to be added, which will undoubtedly significantly increase the manufacturing cost of the chip. In terms of system thermal design, when the chip needs to provide a large power output, the heat dissipation problem becomes the key. If the heat dissipation conditions are not good, the heat generated locally on the chip will accumulate rapidly, causing the chip temperature to rise, thereby reducing its working efficiency.

[0004] In order to meet different load requirements, the current practice is to design a combination of multiple DC-DC boost chips with different specifications. However, this not only increases the complexity of chip design and production, but also brings troubles to system design, because it is necessary to select the appropriate DC-DC boost chip according to different load conditions, which increases the difficulty and cost of design.

[0005] In addition, for high-power DC-DC boost chips, since the power devices are concentrated on a single chip, local overheating is difficult to avoid, which places extremely high demands on the overall heat dissipation design of the system. Once the heat dissipation is not ideal, the efficiency of the chip will be seriously affected, and may even cause system failure. Summary of the invention

[0006] The present invention provides a DC-DC boost system, a control circuit, a control chip and a control method, which solve the problem that the existing DC-DC boost chip adopts a design mode of combining multiple DC-DC boost chips of different specifications to meet different load requirements, resulting in increased difficulty in chip internal structure design and heat dissipation design, increased manufacturing cost, complex production process and poor heat dissipation effect of high-power chips.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a DC-DC boost system, including a power conversion module and a boost control module; the power conversion module is used to connect to a first DC power supply, and under the action of the boost control module, the first DC power supply is converted into a second DC power supply output; the boost control module includes a first boost control chip and a second boost control chip, the internal circuit structures of the first boost control chip and the second boost control chip are the same, and the first boost control chip is used to control the second boost control chip; the switch control pin, ground pin, voltage output pin and voltage feedback pin of the first boost control chip are electrically connected to the power conversion module respectively, and the control output pin of the first boost control chip is electrically connected to the overcurrent protection pin of the second boost control chip; the switch control pin and voltage output pin of the second boost control chip are electrically connected to the power conversion module respectively, and the voltage feedback pin of the second boost control chip is grounded.

[0008] In some embodiments, the power conversion module includes an inductor, a diode and an output capacitor; the first end of the inductor is used to connect to the positive electrode of the first DC power supply, the second end of the inductor is respectively electrically connected to the switch control pin of the first boost control chip, the switch control pin of the second boost control chip and the positive electrode of the diode, and the negative electrode of the first DC power supply is used to be electrically connected to the ground pin of the first boost control chip and grounded; the negative electrode of the diode is respectively electrically connected to the first end of the output capacitor, the voltage output pin and the voltage feedback pin of the first boost control chip, and the voltage output pin of the second boost control chip; the second end of the output capacitor is grounded, and the voltage across the output capacitor is the voltage of the second DC power supply.

[0009] The present invention also provides a DC-DC boost control circuit, comprising a switch control end, a voltage output end, a control output end, an overcurrent protection end, a voltage feedback end, a ground end, a switch tube, a gate control circuit and a master-slave identification circuit; the switch control end and the voltage output end are respectively used to be electrically connected to a controlled power conversion module, and the control output end is used to output a master control signal; the drain of the switch tube is electrically connected to the switch control end, the source of the switch tube is electrically connected to the ground end, and the gate of the switch tube is electrically connected to the first output end of the gate control circuit; the first input end of the gate control circuit is electrically connected to the voltage feedback end, the second input end of the gate control circuit is electrically connected to the overcurrent protection end, the third input end of the gate control circuit is electrically connected to the output end of the master-slave identification circuit, the second output end of the gate control circuit is electrically connected to the control output end, and the gate control circuit is used to control the switch tube; the input end of the master-slave identification circuit is electrically connected to the overcurrent protection end, and the master-slave identification circuit is used to identify the master-slave working mode of the DC-DC boost control circuit.

[0010] In some embodiments, the master-slave identification circuit includes a first D flip-flop, a second D flip-flop, a third D flip-flop and a fourth D flip-flop connected in sequence; the set end of the first D flip-flop is electrically connected to the overcurrent protection end, the data input end of the first D flip-flop is electrically connected to its first output end, and the first output end of the first D flip-flop is also electrically connected to the set end of the second D flip-flop; the data input end of the second D flip-flop is electrically connected to its first output end, and the first output end of the second D flip-flop is also electrically connected to the set end of the third D flip-flop; the data input end of the third D flip-flop is electrically connected to its first output end, and the first output end of the third D flip-flop is also electrically connected to the set end of the fourth D flip-flop; the data input end of the fourth D flip-flop is connected to the third DC power supply, and the second output end of the fourth D flip-flop is electrically connected to the third input end of the gate control circuit.

[0011] In some embodiments, the gate control circuit includes an error amplifier, a comparison circuit, a controller and a drive circuit; the inverting input terminal of the error amplifier is electrically connected to the voltage feedback terminal, the non-inverting input terminal of the error amplifier is connected to a reference voltage, and the error amplifier is used to output an error voltage according to the reference voltage and the feedback voltage; wherein the reference voltage is generated by a reference voltage source, and the feedback voltage is obtained by sampling the voltage feedback terminal; the input terminal of the comparison circuit is electrically connected to the output terminal of the error amplifier and the overcurrent protection terminal, respectively, the output terminal of the comparison circuit is electrically connected to the controller, the controller is also electrically connected to the master-slave identification circuit, the drive circuit and the control output terminal, respectively, and the drive circuit is also electrically connected to the gate of the switch tube; the comparison circuit is used to receive the error voltage and the overcurrent protection voltage, and compare the error voltage and the overcurrent protection voltage with the first reference voltage, respectively, and control the drive circuit together with the controller; the drive circuit is used to control the switch tube.

[0012] In some embodiments, it also includes an enable terminal and a clock control circuit, wherein the enable terminal is used to receive an external enable signal; the clock control circuit includes an oscillator, a slope compensation circuit, a current sampling circuit, a summer and a transmission gate; the input terminal of the oscillator is electrically connected to the enable terminal, the first output terminal of the oscillator is electrically connected to the input terminal of the transmission gate, and the second output terminal of the oscillator is electrically connected to the input terminal of the slope compensation circuit; the first input terminal of the summer is electrically connected to the output terminal of the slope compensation circuit, the second input terminal of the summer is electrically connected to the output terminal of the current sampling circuit, the output terminal of the summer is electrically connected to the gate control circuit, and the summer is used to output a first reference voltage; the input terminal of the current sampling circuit is electrically connected to the source of the switch tube and the ground terminal respectively; the input terminal of the transmission gate is also electrically connected to the overcurrent protection terminal and the output terminal of the master-slave identification circuit respectively, and the output terminal of the transmission gate is electrically connected to the gate control circuit.

[0013] In some embodiments, a soft start circuit is also included. The soft start circuit is electrically connected to the gate control circuit and the master-slave identification circuit respectively, and the soft start circuit is used to achieve soft start of the DC-DC boost control circuit.

[0014] In some embodiments, a voltage stabilizing circuit is further included, wherein the input end of the voltage stabilizing circuit is electrically connected to the voltage output end, the output end of the voltage stabilizing circuit is electrically connected to the master-slave identification circuit, and the voltage stabilizing circuit is used to output a third DC power supply.

[0015] The present invention also provides a DC-DC boost control chip, comprising the DC-DC boost control circuit as described above; wherein the switch control end is a switch control pin, the voltage output end is a voltage output pin, the control output end is a control output pin, the overcurrent protection end is an overcurrent protection pin, the voltage feedback end is a voltage feedback pin, and the ground end is a ground pin.

[0016] The present invention also provides a DC-DC boost control method, comprising the steps of: connecting to a first DC power supply, receiving an enable signal, and performing initialization configuration; identifying the current working mode; if working in the master mode, entering a PWM modulation state, and controlling the main switch tube to be continuously turned on and off, and outputting a master control signal; if working in the slave mode, receiving the master control signal, and according to the master control signal, controlling the slave switch tube to be turned on and off synchronously with the master switch tube; according to the continuous turning on and off of the main switch tube and the slave switch tube, converting the first DC power supply into a second DC power supply and outputting it.

[0017] The beneficial effects of the present invention are as follows: the present invention discloses a DC-DC boost system, a control circuit, a control chip and a control method, wherein the DC-DC boost system includes a power conversion module and a boost control module; the power conversion module is used to access a first DC power supply, and under the action of the boost control module, the first DC power supply is converted into a second DC power supply output; the boost control module includes a first boost control chip and a second boost control chip, the internal circuit structures of the first boost control chip and the second boost control chip are the same, and the first boost control chip is used to control the second boost control chip; the switch control pin, the ground pin, the voltage output pin and the voltage feedback pin of the first boost control chip are respectively electrically connected to the power conversion module, and the control output pin of the first boost control chip is electrically connected to the overcurrent protection pin of the second boost control chip; the switch control pin and the voltage output pin of the second boost control chip are respectively electrically connected to the power conversion module, and the voltage feedback pin of the second boost control chip is grounded. The DC-DC boost system of the present application controls the unified conduction and cutoff of the internal switch tube through multiple parallel boost control chips, cooperates with the power conversion module, converts the first DC power supply into the second DC power supply, and realizes the boost function. Specifically, the remaining boost control chips are controlled by the first boost control chip working in the master mode, so that the remaining boost control chips all work in the slave mode, and follow the working state of the first boost control chip in the master mode, maintain the consistency of the on and off of the internal switch tube, and then perform high-frequency switching action to achieve the boost function. By making the remaining boost control chips all work in the slave mode, the external circuit elements of the remaining boost control chips can be reduced, the design of the system can be simplified, and the manufacturing cost can be reduced. At the same time, the parallel connection of multiple boost control chips can also disperse the power devices, improve the heat dissipation effect of the system, and improve the working efficiency of the boost control chip. The multiple boost control chips of the present application have the same composition structure, and there is no need to design multiple different chips for different loads, which reduces the design and production costs, reduces the difficulty of chip design under different requirements, and improves the flexibility of chip design; and the DC-DC boost system of the present application can select different numbers of boost control chips for parallel connection according to actual load requirements, flexibly configure chip combinations, easily adjust output capacity, and adapt to various complex application scenarios. Multiple boost control chips are connected in parallel and work together. Even if an individual chip fails, the other chips can continue to work, ensuring the normal operation of the system and improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a circuit diagram of a DC-DC boost system of the present invention;

[0019] Figure 2 It is a principle block diagram of a DC-DC boost control circuit of the present invention;

[0020] Figure 3 It is a schematic diagram of a master-slave identification circuit in a DC-DC boost control circuit of the present invention;

[0021] Figure 4 It is a specific circuit diagram of a DC-DC boost control circuit of the present invention;

[0022] Figure 5 It is a principle block diagram of a DC-DC boost control chip of the present invention;

[0023] Figure 6 The first DC power supply voltage V in a plurality of circuit operation cycles in a DC-DC boost system and a DC-DC boost control circuit of the present invention is IN , Enable terminal voltage V EN , soft start circuit output voltage V SSOK , overcurrent protection terminal voltage V ILIM(21) , control output signal duty, switch control terminal voltage V LX , the second DC power supply voltage V OUT and a timing waveform diagram of the identification signal CON;

[0024] Figure 7 The present invention is a DC-DC boost system, a DC-DC boost control circuit, and a switch control terminal voltage V in multiple circuit operation cycles. LX , switch tube current I Q1 , diode current I D1 , inductor current I L1 , clock signal CK, control output signal duty, compensation terminal voltage V COMP and the first reference voltage V Σ The timing waveform diagram of

[0025] Figure 8 It is a flow chart of a DC-DC boost control method of the present invention. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0029] like Figure 1 As shown, the DC-DC boost system of the present invention includes a power conversion module 1 and a boost control module 2; the power conversion module 1 is used to access a first DC power supply, and under the action of the boost control module 2, converts the first DC power supply into a second DC power supply output.

[0030] The boost control module 2 includes a first boost control chip 21 and a second boost control chip 22 . The internal circuit structures of the first boost control chip 21 and the second boost control chip 22 are the same. The first boost control chip 21 is used to control the second boost control chip 22 .

[0031] The switch control pin LX, ground pin GND, voltage output pin VOUT and voltage feedback pin FB of the first boost control chip 21 are electrically connected to the power conversion module 1 respectively, and the control output pin DUTY of the first boost control chip 21 is electrically connected to the overcurrent protection pin ILIM of the second boost control chip 22; the switch control pin LX and voltage output pin VOUT of the second boost control chip 22 are electrically connected to the power conversion module 1 respectively, and the voltage feedback pin FB of the second boost control chip 22 is grounded.

[0032] The DC-DC boost system of the present application controls the uniform conduction and cutoff of the internal switch tube through multiple parallel boost control chips, cooperates with the power conversion module 1, converts the first DC power supply into the second DC power supply, and realizes the boost function. Specifically, the remaining boost control chips are controlled by the first boost control chip 21 working in the master mode, so that the remaining boost control chips all work in the slave mode and follow the working state of the first boost control chip 21 in the master mode, maintain the consistency of the conduction and cutoff of the internal switch tube, and then perform high-frequency switching action to realize the boost function.

[0033] By making the remaining boost control chips all work in slave mode, the external circuit elements of the remaining boost control chips can be reduced, the system design can be simplified, and the manufacturing cost can be reduced. At the same time, the parallel connection of multiple boost control chips can also disperse the power devices, improve the heat dissipation effect of the system, and improve the working efficiency of the boost control chip. The multiple boost control chips of the present application have the same composition structure, and there is no need to design multiple different chips for different loads, which reduces the design and production costs, reduces the difficulty of chip design under different requirements, and improves the flexibility of chip design; and the DC-DC boost system of the present application can select different numbers of boost control chips for parallel connection according to actual load requirements, flexibly configure chip combinations, easily adjust output capacity, and adapt to various complex application scenarios. Multiple boost control chips are connected in parallel and work together. Even if individual chips fail, other chips can continue to work, ensuring the normal operation of the system and improving the reliability of the system.

[0034] Combine the following Figures 1 to 8 , the present application is further described in detail with specific embodiments.

[0035] like Figure 2 As shown, the DC-DC boost control circuit of the present application includes a switch control terminal LX, a voltage output terminal VOUT, a control output terminal DUTY, an overcurrent protection terminal ILIM, a voltage feedback terminal FB, a ground terminal GND, a switch tube Q1 (NMOS tube), a gate control circuit 31 and a master-slave identification circuit 32.

[0036] The switch control terminal LX and the voltage output terminal VOUT are respectively used to be electrically connected to the controlled power conversion module, and the control output terminal DUTY is used to output the main control signal. Figure 4 , the overcurrent protection terminal ILIM is connected to the reference current IREF, where the reference current IREF is generated by a reference current source.

[0037] The drain of the switch tube Q1 is electrically connected to the switch control terminal LX, the source of the switch tube Q1 is electrically connected to the ground terminal GND, and the gate of the switch tube Q1 is electrically connected to the first output terminal OUT1 of the gate control circuit 31. The first input terminal IN1 of the gate control circuit 31 is electrically connected to the voltage feedback terminal FB, the second input terminal IN2 of the gate control circuit 31 is electrically connected to the overcurrent protection terminal ILIM, the third input terminal IN3 of the gate control circuit 31 is electrically connected to the output terminal of the master-slave identification circuit 32, the second output terminal OUT2 of the gate control circuit 31 is electrically connected to the control output terminal DUTY, and the gate control circuit 31 is used to control the switch tube Q1. The input terminal of the master-slave identification circuit 32 is electrically connected to the overcurrent protection terminal ILIM, and the master-slave identification circuit 32 is used to identify the master-slave working mode of the DC-DC boost control circuit of the present application.

[0038] Further, combined with Figure 2 , Figure 3 As shown, the master-slave identification circuit 32 includes a first D flip-flop 33 , a second D flip-flop 34 , a third D flip-flop 35 and a fourth D flip-flop 36 which are connected in sequence.

[0039] Specifically, the set terminal S of the first D flip-flop 33 is electrically connected to the overcurrent protection terminal ILIM, the data input terminal D0 of the first D flip-flop 33 is electrically connected to its first output terminal QN, and the first output terminal QN of the first D flip-flop 33 is also electrically connected to the set terminal S of the second D flip-flop 34; the data input terminal D0 of the second D flip-flop 34 is electrically connected to its first output terminal QN, and the first output terminal QN of the second D flip-flop 34 is also electrically connected to the set terminal S of the third D flip-flop 35; the data input terminal D0 of the third D flip-flop 35 is electrically connected to its first output terminal QN, and the first output terminal QN of the third D flip-flop 35 is also electrically connected to the set terminal S of the fourth D flip-flop 36; the data input terminal D0 of the fourth D flip-flop 36 is connected to the third DC power supply VDD, and the second output terminal Q of the fourth D flip-flop 36 is electrically connected Figure 2 The third input terminal IN3 of the gate control circuit 31.

[0040] Further, combined with Figure 2 , Figure 4 As shown, the gate control circuit 31 includes an error amplifier 41, a comparison circuit 42, a controller 43 and a drive circuit 44. In this embodiment, the controller 43 is an RS trigger.

[0041] Specifically, the inverting input terminal of the error amplifier 41 is electrically connected to the voltage feedback terminal FB, and the non-inverting input terminal of the error amplifier 41 is connected to the reference voltage VREF. The error amplifier 41 is used to generate a voltage signal according to the reference voltage VREF and the feedback voltage V FB , output error voltage V ER Among them, the reference voltage VREF is generated by the reference voltage source, and the feedback voltage V FB The voltage is obtained by sampling the voltage feedback terminal FB. The DC-DC boost control circuit of the present application further includes a compensation terminal COMP, and the output terminal of the error amplifier 41 is electrically connected to the compensation terminal COMP.

[0042] The input end of the comparison circuit 42 is electrically connected to the output end of the error amplifier 41 and the overcurrent protection end ILIM, and the output end of the comparison circuit 42 is electrically connected to the controller 43. The controller 43 is also electrically connected to the master-slave identification circuit 32, the drive circuit 44 and the control output end DUTY, and the drive circuit 44 is also electrically connected to the gate of the switch tube Q1. The comparison circuit 42 is used to receive the error voltage V ER and overcurrent protection voltage V ILIM and the error voltage V ER , Overcurrent protection voltage VILIM and the first reference voltage V Σ The comparison is performed and the driving circuit 44 is controlled together with the controller 43. The driving circuit 44 is used to control the on and off of the switch tube Q1.

[0043] In this embodiment, the comparison circuit 42 includes a first comparator 45 and a second comparator 46. The inverting input terminal of the first comparator 45 is electrically connected to the output terminal of the error amplifier 41 and receives the error voltage V ER The non-inverting input terminal of the first comparator 45 is connected to the first reference voltage V Σ The output end of the first comparator 45 is electrically connected to the controller 43 for outputting the modulation signal PWM. The inverting input end of the second comparator 46 is electrically connected to the overcurrent protection end ILIM for receiving the overcurrent protection voltage V ILIM The non-inverting input terminal of the second comparator 46 is connected to the first reference voltage V Σ The output end of the second comparator 46 is electrically connected to the controller 43 for outputting an over-current protection signal OCP.

[0044] Further, combined with Figures 2 to 4 As shown, the DC-DC boost control circuit of the present application also includes an enable terminal EN and a clock control circuit, and the enable terminal EN is used to receive an external enable signal. Figure 3 The reset terminal rstb of the fourth D flip-flop 36 of the master-slave identification circuit 32 is electrically connected. In this embodiment, the clock control circuit includes an oscillator 51, a slope compensation circuit 52, a current sampling circuit 53, a summer 54 and a transmission gate 55.

[0045] Specifically, the input end of the oscillator 51 is electrically connected to the enable end EN, the first output end of the oscillator 51 is electrically connected to the input end of the transmission gate 55, and the second output end of the oscillator 51 is electrically connected to the input end of the slope compensation circuit 52. The first input end of the summer 54 is electrically connected to the output end of the slope compensation circuit 52, the second input end of the summer 54 is electrically connected to the output end of the current sampling circuit 53, and the output end of the summer 54 is electrically connected to the gate control circuit 31 (that is, electrically connected to the same-inverting input end of the first comparator 45 and the same-inverting input end of the second comparator 46, respectively). The summer 54 is used to output the first reference voltage V Σ The input end of the current sampling circuit 53 is electrically connected to the source of the switch tube Q1 and the ground terminal GND. The input end of the transmission gate 55 is also electrically connected to the overcurrent protection terminal ILIM (through the first NOT gate 56) and the output end of the master-slave identification circuit 32 (i.e. Figure 3 The output end of the transmission gate 55 is electrically connected to the gate control circuit 31 (ie, the input end of the controller 43).

[0046] Further, combined with Figures 2 to 4As shown, the DC-DC boost control circuit of the present application further includes a soft start circuit 61. The soft start circuit 61 is electrically connected to the gate control circuit 31 and the master-slave identification circuit 32 respectively, and is used to realize the soft start of the DC-DC boost control circuit.

[0047] Specifically, the output end of the soft start circuit 61 is electrically connected to the control end of the error amplifier 41 in the gate control circuit 31, and the output end of the soft start circuit 61 is also electrically connected to the reset end rstb of the first D flip-flop 33, the second D flip-flop 34 and the third D flip-flop 35 in the master-slave identification circuit 32 through the second NOT gate 37.

[0048] Further, combined with Figures 2 to 4 As shown, the DC-DC boost control circuit of the present application also includes a voltage stabilizing circuit 62, the input end of the voltage stabilizing circuit 62 is electrically connected to the voltage output end VOUT, the output end of the voltage stabilizing circuit 62 is electrically connected to the master-slave identification circuit 32, and the voltage stabilizing circuit 62 is used to output a third DC power supply VDD.

[0049] Specifically, the output end of the voltage stabilizing circuit 62 is electrically connected to the data input end D0 of the fourth D flip-flop 36 of the master-slave identification circuit 32 for supplying power to the master-slave identification circuit 32 .

[0050] In summary, combined Figures 2 to 4 As shown, the working principle of the DC-DC boost control circuit of the present application is:

[0051] First, the switch control terminal LX is connected to an external power supply, the enable terminal EN receives an external enable signal, the DC-DC boost control circuit is enabled and turned on, and the internal modules begin to initialize configuration according to the peripheral circuit settings.

[0052] If the peripheral circuit of the DC-DC boost control circuit is designed to work in the master mode, the voltage of the external connection circuit of the overcurrent protection terminal ILIM gradually increases, causing the voltage of the overcurrent protection terminal ILIM to increase to a preset value, and the DC-DC boost control circuit begins to enter the PWM modulation state. The gate control circuit 31 controls the on and off of the switch tube Q1; at the same time, the controller 43 of the gate control circuit 31 controls the control output terminal DUTY to output a master control signal to another DC-DC boost control circuit working in the slave mode, and controls it.

[0053] If the peripheral circuit of the DC-DC boost control circuit is designed to work in slave mode at this time, its overcurrent protection terminal ILIM receives the master control signal output by the control output terminal DUTY of another DC-DC boost control circuit working in master mode. At this time, the master-slave identification circuit 32 of the DC-DC boost control circuit receives the master control signal and starts to identify. After continuously detecting the rising edge of several master control signals, the master-slave identification circuit 32 determines that the DC-DC boost control circuit works in slave mode. Further output the identification signal CON to the transmission gate 55 in the clock control circuit, and the transmission gate 55 switches the clock signal CK output by the original oscillator 51 to the master control signal of the overcurrent protection terminal ILIM according to the identification signal CON, and inputs it into the controller 43 of the gate control circuit 31. The controller 43 controls the operation of the drive circuit 44 according to the master control signal, so that the switch tube Q1 of the DC-DC boost control circuit follows the switch tube Q1 of another DC-DC boost control circuit working in master mode to be turned on and off at the same time.

[0054] Based on the same inventive concept, the present invention also provides a DC-DC boost control chip. Figure 5 As shown, the DC-DC boost control chip includes the aforementioned DC-DC boost control circuit 30. Among them, the switch control end is the switch control pin LX, the voltage output end is the voltage output pin VOUT, the control output end is the control output pin DUTY, the overcurrent protection end is the overcurrent protection pin ILIM, the voltage feedback end is the voltage feedback pin FB, and the ground end is the ground pin GND. The DC-DC boost control chip also includes an enable pin EN and a compensation pin COMP.

[0055] In the present application, other technical features of the above-mentioned DC-DC boost control chip are the same as the features disclosed in the embodiment of the above-mentioned DC-DC boost control circuit 30, and are not described in detail here.

[0056] Based on the same inventive concept, the present invention also provides a DC-DC boost system. Figure 1 As shown, the DC-DC boost system includes a power conversion module 1 and a boost control module 2. The power conversion module 1 is used to access a first DC power source, and under the action of the boost control module 2, converts the first DC power source into a second DC power source for output.

[0057] In this embodiment, the boost control module 2 includes a first boost control chip 21 and a second boost control chip 22 . The internal circuit structures of the first boost control chip 21 and the second boost control chip 22 are the same. The first boost control chip 21 is used to control the second boost control chip 22 .

[0058] In the present application, the internal circuit composition of the first boost control chip 21 and the second boost control chip 22 in the above-mentioned DC-DC boost system is the same as that of the aforementioned DC-DC boost control chip. For details, please refer to the contents disclosed in the aforementioned DC-DC boost control chip, which will not be repeated here.

[0059] Further, such as Figure 1 As shown, the power conversion module 1 includes an input capacitor C IN , inductor L1, diode D1 and output capacitor C OUT .

[0060] The positive and negative electrodes of the first DC power supply are connected to the input capacitor C IN The two ends of the input capacitor C IN The voltage at both ends is the voltage of the first DC power supply. When the switches inside the first boost control chip 21 and the second boost control chip 22 are turned on at the same time, the first DC power supply charges the inductor L1, and the current on the inductor L1 increases linearly. When the switches inside the first boost control chip 21 and the second boost control chip 22 are turned off at the same time, the inductor L1 discharges, outputs the second DC power supply through the diode D1, and the output capacitor C OUT The voltage across the two ends is the voltage of the second DC power supply, and the output capacitor C OUT The two ends are also used to connect the load.

[0061] Specifically, the first end of the inductor L1 is used to connect the positive electrode of the first DC power supply (the input capacitor C IN The first end of the inductor L1 is electrically connected to the switch control pin LX of the first boost control chip 21, the switch control pin LX of the second boost control chip 22 and the positive electrode of the diode D1, and the negative electrode of the first DC power supply (input capacitor C IN The second end of the diode D1 is used to be electrically connected to the ground pin GND of the first boost control chip 21 and to be grounded. The cathode of the diode D1 is electrically connected to the output capacitor C OUT The first end of the output capacitor C, the voltage output pin VOUT and the voltage feedback pin FB of the first boost control chip 21, and the voltage output pin VOUT of the second boost control chip 22. OUT The second end of the output capacitor C OUT The voltage across the two ends is the voltage of the second DC power supply.

[0062] Further, such as Figure 1 As shown, the first boost control chip 21 and the second boost control chip 22 both include a switch control pin LX, a ground pin GND, a voltage output pin VOUT, a voltage feedback pin FB, a control output pin DUTY, an overcurrent protection pin ILIM, an enable pin EN and a compensation pin COMP.

[0063] In this embodiment, the switch control pin LX, the ground pin GND, the voltage output pin VOUT and the voltage feedback pin FB of the first boost control chip 21 are electrically connected to the power conversion module 1, and the control output pin DUTY of the first boost control chip 21 is electrically connected to the overcurrent protection pin ILIM of the second boost control chip 22. The switch control pin LX and the voltage output pin VOUT of the second boost control chip 22 are electrically connected to the power conversion module 1, and the voltage feedback pin FB of the second boost control chip 22 is grounded.

[0064] Specifically, the enable pins EN of the first boost control chip 21 and the second boost control chip 22 are both used to receive an external enable signal. The voltage output pin VOUT of the first boost control chip 21 is also electrically connected to the first output capacitor C 1 The voltage output pin VOUT of the first boost control chip 21 is connected to the first output capacitor C 1 The electrical connection of the first boost control chip 21 is electrically connected to the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 and then grounded. The electrical connection of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is electrically connected to the voltage feedback pin FB of the first boost control chip 21. The overcurrent protection pin ILIM of the first boost control chip 21 is electrically connected to the current limiting resistor R ILIM The overcurrent protection pin ILIM of the first boost control chip 21 is connected to the current limiting resistor R ILIM The electrical connection is also electrically connected to the current limiting capacitor C SS The compensation pin COMP of the first boost control chip 21 is electrically connected to a compensation network, wherein the compensation network includes a compensation resistor R COMP , the first compensation capacitor C COMP1 and the second compensation capacitor C COMP2 Specifically, the compensation pin COMP of the first boost control chip 21 is electrically connected to the compensation resistor R COMP , the first compensation capacitor C COMP1 The first boost control chip 21 is connected to the compensation pin COMP and the compensation resistor R COMP The electrical connection of the second compensation capacitor C COMP2 The ground pin GND of the second boost control chip 22 is grounded, and the voltage output pin VOUT of the second boost control chip 22 is also electrically connected to the second output capacitor C 2 Then ground.

[0065] Among them, after the power conversion module 1 is connected to the first DC power supply, when the switch tubes inside the first boost control chip 21 and the second boost control chip 22 are turned on at the same time, the first DC power supply charges the inductor L1, and the current on the inductor L1 increases linearly. At this time, the inductor L1 stores energy, and due to the current retention characteristics of the inductor L1, the charging current is basically constant, corresponding to the left side of the inductor L1 is positive, and the right side is negative. When the switch tubes inside the first boost control chip 21 and the second boost control chip 22 are cut off at the same time, since the current of the inductor L1 does not change suddenly, the inductor L1 releases the stored energy at this time, and the inductor L1 and the first DC power supply pass through the diode D1 to output the second DC power supply to supply power to the load, thereby achieving a boost effect. At this time, the current of the inductor L1 gradually decreases, corresponding to the right side of the inductor L1 is positive, and the left side is negative.

[0066] In this process, when the first boost control chip 21 starts working, it outputs a main control signal to the overcurrent protection pin ILIM of the second boost control chip 22 through its control output pin DUTY, thereby controlling the second boost control chip 22. At this time, the first boost control chip 21 works in the master mode, and the second boost control chip 22 works in the slave mode, that is, the working state of the second boost control chip 22 follows the working state of the first boost control chip 21. When the switch tube inside the first boost control chip 21 is turned on, the switch tube inside the second boost control chip 22 is also turned on; when the switch tube inside the first boost control chip 21 is turned off, the switch tube inside the second boost control chip 22 is also turned off and remains consistent. The present application realizes the conversion of the first DC power supply to the second DC power supply through the joint action of the first boost control chip 21 and the second boost control chip 22 connected in parallel, in cooperation with the power conversion module 1.

[0067] In this embodiment, by using the output capacitor C OUT The discharge voltage of the inductor L1 and the voltage of the first DC power supply are superimposed by the electronic components such as the diode D1, thereby increasing the output voltage and obtaining the corresponding second DC power supply. Figure 1 It can be seen that the power conversion module 1 forms a boost circuit by connecting the first boost control chip 21 and the second boost control chip 22, and uses the inductor L1 and the output capacitor C OUT The energy storage characteristics of the first boost control chip 21 and the second boost control chip 22 perform high-frequency switching actions to store the input electrical energy in the inductor L1 and the output capacitor C OUT In the process, when the switch tubes are turned off at the same time, the electrical energy is released to the load to provide the required voltage.

[0068] In some other embodiments, the boost control module 2 of the DC-DC boost system of the present application further includes a plurality of third boost control chips, fourth boost control chips, ..., Nth boost control chips connected in parallel. The composition of each chip is the same as that of the first boost control chip 21 and the second boost control chip 22. At the same time, the first boost control chip 21 is a chip working in the master mode, and the remaining boost control chips all work in the slave mode and work under the control of the first boost control chip 21.

[0069] It should be noted that the number of boost control chips included in the boost control module 2 can be selected and set according to actual needs (for example, 2 to N boost control chips can be selected according to different power requirements of the load), and the external connection relationship of each boost control chip can be adaptively adjusted.

[0070] The DC-DC boost system of the present application controls the uniform conduction and cutoff of the internal switch tube through multiple parallel boost control chips, cooperates with the power conversion module 1, converts the first DC power supply into the second DC power supply, and realizes the boost function. Specifically, the remaining boost control chips are controlled by the first boost control chip 21 working in the master mode, so that the remaining boost control chips all work in the slave mode and follow the working state of the first boost control chip 21 in the master mode, maintain the consistency of the conduction and cutoff of the internal switch tube, and then perform high-frequency switching action to realize the boost function.

[0071] By making the remaining boost control chips all work in slave mode, the external circuit elements of the remaining boost control chips can be reduced, the system design can be simplified, and the manufacturing cost can be reduced. At the same time, the parallel connection of multiple boost control chips can also disperse the power devices, improve the heat dissipation effect of the system, and improve the working efficiency of the boost control chip. The multiple boost control chips of the present application have the same composition structure, and there is no need to design multiple different chips for different loads, which reduces the design and production costs, reduces the difficulty of chip design under different requirements, and improves the flexibility of chip design; and the DC-DC boost system of the present application can select different numbers of boost control chips for parallel connection according to actual load requirements, flexibly configure chip combinations, easily adjust output capacity, and adapt to various complex application scenarios. Multiple boost control chips are connected in parallel and work together. Even if individual chips fail, other chips can continue to work, ensuring the normal operation of the system and improving the reliability of the system.

[0072] In summary, the following combination Figure 6 and Figure 7 As shown, the principles of the DC-DC boost system, DC-DC boost control circuit, and DC-DC boost control chip of the present application are uniformly explained.

[0073] Figure 6 shows the first DC power supply voltage V during multiple circuit operation cycles IN , Enable terminal voltage V EN , soft start circuit output voltage V SSOK , overcurrent protection terminal voltage V ILIM(21) , control output signal duty, switch control terminal voltage V LX , the second DC power supply voltage V OUT And the timing waveform of the identification signal CON. Figure 7 The switch control terminal voltage V is shown in multiple circuit operation cycles. LX , switch tube current I Q1 , diode current I D1 , inductor current I L1 , clock signal CK, control output signal duty, compensation terminal voltage V COMP and the first reference voltage V Σ Timing waveform diagram.

[0074] Specific, combined Figures 1 to 7 , the working principle of the present invention is:

[0075] First, the first DC power supply is connected through the power conversion module 1. Figure 6 The first DC power supply voltage V IN The enable pins EN of the first boost control chip 21 and the second boost control chip 22 of the DC-DC boost system receive an enable signal. At this time, the enable terminal voltage V EN The voltage of the enable pin EN is increased to a fixed value. The first boost control chip 21 and the second boost control chip 22 start internal initialization configuration.

[0076] Furthermore, the overcurrent protection terminal voltage V ILIM(21) (i.e., the voltage of the overcurrent protection pin ILIM) gradually increases and reaches a preset value, and the first boost control chip 21 begins to enter the PWM modulation state. The gate control circuit 31 inside the first boost control chip 21 controls the on and off of the switch tube Q1; at the same time, the control output pin DUTY of the first boost control chip 21 outputs the main control signal (i.e., Figure 6 The control output terminal signal duty) is given to the second boost control chip 22, and controls the second boost control chip 22. At this time, the control output terminal signal duty is constantly switched between high level and low level, and its corresponding identification signal CON remains at a low level during this period.

[0077] Further, the overcurrent protection pin ILIM of the second boost control chip 22 receives the main control signal (ie Figure 6The master-slave identification circuit 32 in the second boost control chip 22 starts to identify the master-slave signal. Figure 6 After the rising edge of the control output signal duty) of the second boost control chip 22, the master-slave identification circuit 32 determines that the second boost control chip 22 is working in the slave mode. The identification signal CON is further output to the transmission gate 55 in the clock control circuit. The transmission gate 55 switches the clock signal CK output by the original oscillator 51 to the master control signal (i.e., the master control signal) received by the overcurrent protection pin ILIM according to the identification signal CON of the second boost control chip 22. Figure 6 The controller 43 controls the driving circuit 44 to work according to the main control signal, so that the switch tube Q1 inside the second boost control chip 22 is turned on and off simultaneously with the switch tube Q1 of the first boost control chip 21, and cooperates with the power conversion module 1 to convert the first DC power supply into the second DC power supply, thereby realizing the boost function.

[0078] Among them, combined Figure 7 As shown, when the switch tube Q1 of the first boost control chip 21 and the second boost control chip 22 is in the on state (Ton), the voltage of the corresponding switch control pin LX (i.e., the switch control terminal voltage V LX ) is 0; the corresponding current I flowing through the switch tube Q1 Q1 and the current I flowing through the inductor L1 L1 are basically the same, and both gradually increase until they reach their highest point when the switch tube Q1 is turned off; at this time, the diode D1 and the output capacitor C OUT are short-circuited, corresponding to the current I flowing through diode D1 D1 is 0. At this time, the main control signal ( Figure 7 The control output signal (duty) remains at a high level.

[0079] When the switch tube Q1 is in the off state (Toff), the voltage of the corresponding switch control pin LX (i.e., the switch control terminal voltage V LX ) reaches its maximum; at this time, the current I flowing through the switch tube Q1 Q1 is 0; due to the current I L1 No sudden change, so the current I flowing through the inductor L1 L1 Gradually decreases; at the same time, since the inductor L1 and the diode D1 are connected in series at this time, the corresponding current I flowing through the diode D1 D1 The current I flowing through the inductor L1 L1 The same. At this time, the main control signal ( Figure 7 The control output signal (duty) remains at a low level.

[0080] It should be noted that when the switch tube Q1 is turned on and off, the appearance / change of voltage and current is not a sudden process, but a gradual change, but the change time is very short.

[0081] Based on the same inventive concept, the present invention also provides a DC-DC boost control method.

[0082] like Figure 8 As shown, the DC-DC boost control method comprises the steps of:

[0083] S1: Connect to the first DC power supply, receive an enable signal, and perform initialization configuration.

[0084] S2: Identify the current working mode.

[0085] S3: If working in the main mode, it enters the PWM modulation state, controls the main switch tube to be continuously turned on and off, and outputs the main control signal.

[0086] S4: If working in slave mode, the master control signal is received, and according to the master control signal, the slave switch tube is controlled to be turned on and off synchronously with the master switch tube.

[0087] S5: According to the continuous on and off of the main switch tube and the slave switch tube, the first DC power source is converted into a second DC power source and outputted.

[0088] In the present application, other technical features in the above-mentioned DC-DC boost control method are the same as the features disclosed in the above-mentioned embodiment of the DC-DC boost system, and are not described in detail here.

[0089] It can be seen that the present invention discloses a DC-DC boost system, a control circuit, a control chip and a control method, wherein the DC-DC boost system includes a power conversion module and a boost control module; the power conversion module is used to access a first DC power supply, and under the action of the boost control module, the first DC power supply is converted into a second DC power supply output; the boost control module includes a first boost control chip and a second boost control chip, the internal circuit structures of the first boost control chip and the second boost control chip are the same, and the first boost control chip is used to control the second boost control chip; the switch control pin, the ground pin, the voltage output pin and the voltage feedback pin of the first boost control chip are respectively electrically connected to the power conversion module, and the control output pin of the first boost control chip is electrically connected to the overcurrent protection pin of the second boost control chip; the switch control pin and the voltage output pin of the second boost control chip are respectively electrically connected to the power conversion module, and the voltage feedback pin of the second boost control chip is grounded. The DC-DC boost system of the present application controls the unified conduction and cutoff of the internal switch tube through multiple parallel boost control chips, cooperates with the power conversion module, converts the first DC power supply into the second DC power supply, and realizes the boost function. Specifically, the remaining boost control chips are controlled by the first boost control chip working in the master mode, so that the remaining boost control chips all work in the slave mode, and follow the working state of the first boost control chip in the master mode, maintain the consistency of the on and off of the internal switch tube, and then perform high-frequency switching action to achieve the boost function. By making the remaining boost control chips all work in the slave mode, the external circuit elements of the remaining boost control chips can be reduced, the design of the system can be simplified, and the manufacturing cost can be reduced. At the same time, the parallel connection of multiple boost control chips can also disperse the power devices, improve the heat dissipation effect of the system, and improve the working efficiency of the boost control chip. The multiple boost control chips of the present application have the same composition structure, and there is no need to design multiple different chips for different loads, which reduces the design and production costs, reduces the difficulty of chip design under different requirements, and improves the flexibility of chip design; and the DC-DC boost system of the present application can select different numbers of boost control chips for parallel connection according to actual load requirements, flexibly configure chip combinations, easily adjust output capacity, and adapt to various complex application scenarios. Multiple boost control chips are connected in parallel and work together. Even if an individual chip fails, the other chips can continue to work, ensuring the normal operation of the system and improving the reliability of the system.

[0090] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A DC-DC boost system, characterized in that: It includes a power conversion module and a boost control module; the power conversion module is used to access a first DC power supply, and under the action of the boost control module, convert the first DC power supply into a second DC power supply output; The boost control module comprises a first boost control chip and a second boost control chip, the internal circuit structures of the first boost control chip and the second boost control chip are the same, and the first boost control chip is used to control the second boost control chip; The switch control pin, ground pin, voltage output pin and voltage feedback pin of the first boost control chip are electrically connected to the power conversion module respectively, and the control output pin of the first boost control chip is electrically connected to the overcurrent protection pin of the second boost control chip; the switch control pin and voltage output pin of the second boost control chip are electrically connected to the power conversion module respectively, and the voltage feedback pin of the second boost control chip is grounded.

2. The DC-DC boost system according to claim 1, characterized in that: The power conversion module includes an inductor, a diode and an output capacitor; The first end of the inductor is used to connect the positive electrode of the first DC power supply, the second end of the inductor is electrically connected to the switch control pin of the first boost control chip, the switch control pin of the second boost control chip and the positive electrode of the diode respectively, and the negative electrode of the first DC power supply is used to be electrically connected to the ground pin of the first boost control chip and grounded; The cathode of the diode is electrically connected to the first end of the output capacitor, the voltage output pin and the voltage feedback pin of the first boost control chip, and the voltage output pin of the second boost control chip respectively; The second end of the output capacitor is grounded, and the voltage across the output capacitor is the voltage of the second DC power supply.

3. A DC-DC boost control circuit, characterized in that: It includes a switch control terminal, a voltage output terminal, a control output terminal, an overcurrent protection terminal, a voltage feedback terminal, a ground terminal, a switch tube, a gate control circuit and a master-slave identification circuit; The switch control terminal and the voltage output terminal are respectively used to be electrically connected to the controlled power conversion module, and the control output terminal is used to output a main control signal; The drain of the switch tube is electrically connected to the switch control terminal, the source of the switch tube is electrically connected to the ground terminal, and the gate of the switch tube is electrically connected to the first output terminal of the gate control circuit; The first input terminal of the gate control circuit is electrically connected to the voltage feedback terminal, the second input terminal of the gate control circuit is electrically connected to the overcurrent protection terminal, the third input terminal of the gate control circuit is electrically connected to the output terminal of the master-slave identification circuit, the second output terminal of the gate control circuit is electrically connected to the control output terminal, and the gate control circuit is used to control the switch tube; The input end of the master-slave identification circuit is electrically connected to the overcurrent protection end, and the master-slave identification circuit is used to identify the master-slave working mode of the DC-DC boost control circuit.

4. The DC-DC boost control circuit according to claim 3, characterized in that: The master-slave identification circuit includes a first D flip-flop, a second D flip-flop, a third D flip-flop and a fourth D flip-flop connected in sequence; The set terminal of the first D flip-flop is electrically connected to the overcurrent protection terminal, the data input terminal of the first D flip-flop is electrically connected to its first output terminal, and the first output terminal of the first D flip-flop is also electrically connected to the set terminal of the second D flip-flop; the data input terminal of the second D flip-flop is electrically connected to its first output terminal, and the first output terminal of the second D flip-flop is also electrically connected to the set terminal of the third D flip-flop; the data input terminal of the third D flip-flop is electrically connected to its first output terminal, and the first output terminal of the third D flip-flop is also electrically connected to the set terminal of the fourth D flip-flop; the data input terminal of the fourth D flip-flop is connected to a third DC power supply, and the second output terminal of the fourth D flip-flop is electrically connected to the third input terminal of the gate control circuit.

5. The DC-DC boost control circuit according to claim 3, characterized in that: The gate control circuit includes an error amplifier, a comparison circuit, a controller and a drive circuit; The inverting input terminal of the error amplifier is electrically connected to the voltage feedback terminal, the non-inverting input terminal of the error amplifier is connected to the reference voltage, and the error amplifier is used to output an error voltage according to the reference voltage and the feedback voltage; wherein the reference voltage is generated by a reference voltage source, and the feedback voltage is obtained by sampling the voltage feedback terminal; The input end of the comparison circuit is electrically connected to the output end of the error amplifier and the overcurrent protection end respectively, the output end of the comparison circuit is electrically connected to the controller, the controller is also electrically connected to the master-slave identification circuit, the drive circuit and the control output end respectively, and the drive circuit is also electrically connected to the gate of the switching tube; the comparison circuit is used to receive the error voltage and the overcurrent protection voltage, and compare the error voltage and the overcurrent protection voltage with the first reference voltage respectively, and control the drive circuit together with the controller; the drive circuit is used to control the switching tube.

6. The DC-DC boost control circuit according to claim 3, characterized in that: It also includes an enable terminal and a clock control circuit, wherein the enable terminal is used to receive an external enable signal; the clock control circuit includes an oscillator, a slope compensation circuit, a current sampling circuit, a summer and a transmission gate; The input end of the oscillator is electrically connected to the enable end, the first output end of the oscillator is electrically connected to the input end of the transmission gate, and the second output end of the oscillator is electrically connected to the input end of the slope compensation circuit; The first input end of the summer is electrically connected to the output end of the slope compensation circuit, the second input end of the summer is electrically connected to the output end of the current sampling circuit, the output end of the summer is electrically connected to the gate control circuit, and the summer is used to output a first reference voltage; The input end of the current sampling circuit is electrically connected to the source of the switch tube and the ground end respectively; the input end of the transmission gate is also electrically connected to the overcurrent protection end and the output end of the master-slave identification circuit respectively, and the output end of the transmission gate is electrically connected to the gate control circuit.

7. The DC-DC boost control circuit according to claim 3, characterized in that: It also includes a soft start circuit, which is electrically connected to the gate control circuit and the master-slave identification circuit respectively, and is used to realize the soft start of the DC-DC boost control circuit.

8. The DC-DC boost control circuit according to claim 3, characterized in that: It also includes a voltage stabilizing circuit, the input end of the voltage stabilizing circuit is electrically connected to the voltage output end, the output end of the voltage stabilizing circuit is electrically connected to the master-slave identification circuit, and the voltage stabilizing circuit is used to output a third DC power supply.

9. A DC-DC boost control chip, characterized in that: It includes a DC-DC boost control circuit as described in any one of claims 3 to 8; wherein the switch control terminal is a switch control pin, the voltage output terminal is a voltage output pin, the control output terminal is a control output pin, the overcurrent protection terminal is an overcurrent protection pin, the voltage feedback terminal is a voltage feedback pin, and the ground terminal is a ground pin.

10. A DC-DC boost control method, characterized in that: Includes steps: Connecting to a first DC power supply and receiving an enable signal to perform initialization configuration; Identify current working patterns; If it works in the main mode, it enters the PWM modulation state, controls the main switch tube to be continuously turned on and off, and outputs the main control signal; If working in slave mode, the master control signal is received, and according to the master control signal, the slave switch tube is controlled to follow the master switch tube to be turned on and off synchronously; According to the continuous on and off of the main switch tube and the slave switch tube, the first DC power supply is converted into a second DC power supply and output.

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