A 45w dual-channel power supply without step-down inductance

Abstract

The embodiment of the present application provides a 45W two-way power supply without step-down inductance, comprising: a primary control module, one end of which is connected with a first end of a synchronous rectification module, and the other end is connected with a feedback and control module; a second end of the synchronous rectification module is connected with an SRG pin of a first control chip in the feedback and control module; a high-frequency chopping module is composed of four low-voltage MOS tubes, and a two-way independent chopping path is formed, two MOS tubes in series in each path are connected between a secondary DC bus and an output filter capacitor, and are used for high-speed on-off chopping of the bus voltage, and then the capacitor energy storage filter is used to output a DC voltage; the feedback and control module is used for comparing the sampled bus voltage with the sampled output voltage based on the voltage provided by the primary control module, so that a DSW pin outputs a high-frequency PWM driving signal; a second control chip in a protocol control module is in communication connection with the first control chip. The power supply reduces the cost, volume and multi-stage conversion loss through a simplified circuit structure, and improves the overall efficiency.

Description

Technical Field

[0001] This invention relates to the field of power supply circuit technology, specifically to a 45W dual-channel power supply without a step-down inductor. Background Technology

[0002] With the increasing power of fast charging in consumer electronics and the growing demand for multi-port charging, dual-port / multi-port PD chargers have become the mainstream product form. Currently, all mass-produced multi-port fast charging power supplies in the industry adopt a two-stage architecture of "fixed DC bus + multiple independent Buck DC-DC (step-down DC-DC converter) step-down": the front-stage isolated flyback circuit outputs a fixed high-voltage bus (typically 20 volts (V)), and each output port corresponds to a complete Buck step-down circuit. Each circuit must be equipped with an independent DC-DC control chip, energy storage power inductor, power switch, freewheeling diode, and external resistors and capacitors, relying on the energy storage-freewheeling process of the inductor to achieve step-down and voltage regulation.

[0003] In this power architecture, the power inductor is one of the largest components in the secondary circuit. The dual-port solution requires two independent inductors, occupying a large amount of horizontal and vertical space on the circuit board, directly limiting the miniaturization and thinning design of the charger. The inductor itself has copper loss and core loss, which, together with the switching loss of the Buck circuit, forms an additional stage of power conversion loss, making it difficult to further improve the overall efficiency and solve the heat generation problem. Moreover, the energy storage inductor has a high unit price and large size, and requires an independent control chip and peripheral components, resulting in high material and surface mount costs. Summary of the Invention

[0004] The purpose of this invention is to provide a 45W dual-channel power supply without a step-down inductor. The specific technical solution adopted is as follows: In a first aspect, embodiments of the present invention provide a 45W dual-channel power supply without a step-down inductor, the power supply comprising: a primary control module, a synchronous rectification module, a high-frequency chopper module, a feedback and control module, and a protocol control module, wherein: One end of the primary control module is connected to the first end of the synchronous rectification module, and the other end is connected to the feedback and control module. It is used to filter and rectify the input AC point to obtain pulsating DC. The pulsating DC is converted into stable high-voltage DC by a filter network and enters the transformer T1. After passing through the transformer T1, it enters the first control chip in the feedback and control module through the inductor BL1. The second end of the synchronous rectification module is connected to the SRG pin of the first control chip in the feedback and control module; the synchronous rectification module is used to drive the external MOS transistor Q1 to perform high-frequency switching rectification based on the output voltage of the SRG pin of the first control chip, and provide it to the high-frequency chopper module; The high-frequency chopper module consists of two independent chopper paths composed of four low-voltage MOSFETs. Each output has two MOSFETs connected in series between the secondary DC bus and the output filter capacitor to perform high-speed switching chopping of the bus voltage. The voltage is then filtered by the capacitor to output DC voltage. The feedback and control module is used to compare the sampled bus voltage with the sampled output voltage based on the voltage provided by the primary control module, so that the DSW pin in the first control chip outputs a high-frequency PWM drive signal to the high-frequency chopper module. The second control chip in the protocol control module is communicatively connected to the first control chip. The second control chip is used to control the conduction state of the MOS transistor Q6 or Q7 connected to the high-frequency chopper module based on the input voltage provided by the synchronous rectification module, so that the high-frequency chopper module outputs DC power to the load.

[0005] In some possible implementations, the synchronous rectification module includes: The gate of MOSFET Q1 is connected to the synchronous rectifier gate drive pin (SRG) of the first control chip. The drain of MOSFET Q1 is connected to transformer T1 and one end of resistor R9. The other end of resistor R9 is connected to one end of capacitor C9. The other end of capacitor C9 is connected to the source of MOSFET Q1 and one end of the rectifier and voltage regulator circuit. The other end of the rectifier and voltage regulator circuit is connected to transformer T1.

[0006] In some possible implementations, the rectifier-regulator circuit includes: The positive terminal of Zener diode ZD1 is connected to one end of capacitor C10, and the other end of capacitor C10 is connected to the input voltage VIN; the negative terminal of Zener diode ZD1 is connected to the negative terminal of diode D3, and the positive terminal of diode D3 is connected to transformer T1.

[0007] In some possible implementations, four low-voltage MOSFETs are used, including MOSFETs Q2, Q3, Q4 and Q5; wherein, each output is configured with two low-voltage MOSFETs connected in series between the secondary DC bus and the output interface to form a unidirectional chopper switch path; MOSFETs Q2 and Q4 are controlled by the high-frequency drive signals output by the first control chip through pins 27 and 28 to control their switching states. MOSFETs Q3 and Q5 are controlled by the high-frequency drive signals output by the first control chip through pins 24 and 23 to control their switching states.

[0008] In some possible implementations, the high-frequency chopper module includes: Resistors R13 and R14 are used to control the drive current of each MOSFET; Resistors R15 and R16 are gate pull-down resistors, used to discharge the gate voltage of each MOSFET to the source when the drive signal disappears, so as to avoid the MOSFET from being mis-turned on; clamping micro-voltage diodes ZD2 and ZD3 are used to prevent the MOSFET from being damaged by excessive drive voltage.

[0009] In some possible implementations, the high-frequency chopper module also includes: a Zener diode is connected across the two ends of resistors R15 and R16 respectively, the positive terminal of the Zener diode is connected to one end of a low-frequency filter capacitor and one end of a high-frequency decoupling capacitor, the other end of the low-frequency filter capacitor is grounded, and the other end of the high-frequency decoupling capacitor is connected to the protocol control module.

[0010] In some possible implementations, the primary control module includes: One end of fuse F1 is connected to AC power, and the other end is connected to the first terminal of common mode inductor LF1. The second terminal of common mode inductor LF1 is connected to thermistor RT1. The third terminal of common mode inductor LF1 is connected to one end of rectifier bridge BD1. The other end of rectifier bridge BD1 is connected to one end of inductor L1, one end of electrolytic capacitor EC1, and one end of resistor R1. The other end of inductor L1 is connected to the other end of resistor R1, one end of electrolytic capacitor EC2, one end of electrolytic capacitor EC3, and one end of spike absorption circuit. The other end of spike absorption circuit is connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of inductor BL1. The other end of inductor BL1 is connected to pin 2 of the first control chip. One end of the auxiliary winding TB1 is connected to one end of resistor R4, one end of resistor R6, and one end of capacitor C4; the other end of resistor R4 is connected to one end of resistor R5 and the positive terminal of diode D2; the other end of resistor R5 is connected to one end of capacitor C5, the other end of capacitor C5 is connected to the negative terminal of diode D2, one end of electrolytic capacitor EC4, one end of capacitor C7, and one end of inductor L2, and the other end of inductor L2 is connected to pin 14 of the first control chip; the other end of resistor R6 is connected to one end of resistor R7, one end of capacitor C6, and connected to pin 17 of the first control chip; one end of resistor R8 is connected to pin 16 of the first control chip, and the other end is grounded; one end of capacitor C8 is connected to pin 15 of the first control chip, and the other end is grounded. The other end of the auxiliary winding TB1 is connected to the other end of capacitor C4, the other end of resistor R7, the other end of electrolytic capacitor EC4, the other end of capacitor C7, and resistor R8 and grounded.

[0011] In some possible implementations, the protocol control module is used to identify the port protocol, communicate with the first control chip through the second control chip to achieve power distribution, and output full power to the corresponding channel when working with a single port; the second control chip draws power from capacitor C10 through pin 3 and provides power supply through capacitor C29. The second control chip is used to turn on MOSFET Q6 or Q7 through the output voltage of pin 16 or 18 when a voltage is sampled at pin 17 or 19, based on the feedback signal from pins 12-15 or 20-23, so that the DC power supply after high-frequency chopping is output to the external load. Pins 4 and 5 are connected in series with a thermistor for over-temperature protection. Pins 6 and 7 provide feedback signals to the output voltage terminals Vo1 and Vo2 respectively, and the output voltage is adjusted by adjusting the duty cycle. The output current is controlled by detecting the voltage across the alloy resistor through pins 10 and 11 and 24 and 25 respectively, so as to realize overcurrent protection.

[0012] The present invention has the following beneficial effects: In a 45W dual-channel power supply without a step-down inductor, one end of the primary control module is connected to the first end of the synchronous rectification module, and the other end is connected to the feedback and control module. It is used to filter and rectify the input AC point to obtain pulsating DC power. A π-shaped filter network is used to convert the pulsating DC power into stable high-voltage DC power and enter the transformer T1. After passing through the transformer T1, it enters the first control chip in the feedback and control module through the inductor BL1. In this way, the primary control module can provide a stable DC voltage and control the primary overcurrent protection (OCP) to avoid core saturation. The second terminal of the synchronous rectification module is connected to the SRG pin of the first control chip in the feedback and control module. The synchronous rectification module is used to drive the external MOSFET Q1 to perform high-frequency switching rectification based on the output voltage of the SRG pin of the first control chip, and provide it to the high-frequency chopper module. The high-frequency chopper module consists of two independent chopper paths composed of four low-voltage MOSFETs. Each output has two MOSFETs connected in series between the secondary DC bus and the output filter capacitor to perform high-speed switching chopping of the bus voltage. After energy storage and filtering by the capacitor, the DC voltage is output. In this way, the energy storage inductor of the DC-DC circuit is completely eliminated in the high-frequency chopper module. Secondary voltage regulation is achieved only through high-frequency chopping by the switching transistor and filtering by the output capacitor, breaking through the inductor dependence bottleneck at the topology level. The feedback and control module, based on the voltage provided by the primary control module, compares the sampled bus voltage with the sampled output voltage to output a high-frequency PWM drive signal to the high-frequency chopper module via the DSW pin of the first control chip. The second control chip in the protocol control module communicates with the first control chip. This second control chip controls the conduction state of the MOSFET Q6 or Q7 connected to the high-frequency chopper module based on the input voltage provided by the synchronous rectification module, enabling the high-frequency chopper module to output DC power to the load. Thus, the primary-side PWM controller, gallium nitride power transistor, digital isolation communication, secondary synchronous rectification controller, and secondary high-frequency chopper driver are all integrated into a single package using the first control chip. The secondary side only requires an external MOSFET switch array and an output filter capacitor, directly driven by the first control chip to achieve high-frequency chopping voltage regulation. Simultaneously, internal phase control within the chip enables natural commutation of the dual-output circuit and intelligent power distribution. This extremely simplified circuit structure reduces cost, size, and multi-stage conversion losses, thereby improving overall efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the composition structure of a 45W dual-channel power supply without step-down inductor provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another component structure of a 45W dual-channel power supply without step-down inductor provided in an embodiment of the present invention. Detailed Implementation

[0015] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a 45W dual-channel power supply without a step-down inductor proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments may be combined from any suitable form.

[0016] In the description of the embodiments of the present invention, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present invention, "multiple" means two or more.

[0017] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0019] The following describes in detail, with reference to the accompanying drawings, a specific solution for a 45W dual-channel power supply without a step-down inductor provided by this invention. This power supply is a 45W dual-Port C-type gallium nitride fast-charging power supply. The front-end adopts a flyback isolation topology, and the main control chip is the Southchip SC3107M highly integrated packaged chip. The secondary stage has no energy storage inductor or independent DC-DC control chip; it only uses four low-voltage MOSFETs to form a dual-channel chopper switch array, paired with a dual-port protocol chip to achieve output control. Please refer to... Figure 1 The diagram illustrates the structural composition of a 45W dual-channel power supply without a step-down inductor according to an embodiment of the present invention. The power supply includes: a primary control module 101, a synchronous rectification module 102, a high-frequency chopper module 103, a feedback and control module 104, and a protocol control module 105; wherein... One end of the primary control module is connected to the first end of the synchronous rectification module, and the other end is connected to the feedback and control module. It is used to filter and rectify the input AC point to obtain pulsating DC. The pulsating DC is converted into stable high-voltage DC by a π-shaped filter network and enters the transformer T1. After passing through the transformer T1, it enters the first control chip in the feedback and control module through the inductor BL1.

[0020] Here, the primary control chip is the Southchip SC3107M. The primary control module is as follows: Figure 2 As shown, the system includes: one end of fuse F1 is connected to AC power, and the other end is connected to the first end of common mode inductor LF1; the second end of common mode inductor LF1 is connected to thermistor RT1; the third end of common mode inductor LF1 is connected to one end of rectifier bridge BD1; the other end of rectifier bridge BD1 is connected to one end of inductor L1, one end of electrolytic capacitor EC1, and one end of resistor R1; the other end of inductor L1 is connected to the other end of resistor R1, one end of electrolytic capacitor EC2, one end of electrolytic capacitor EC3, and one end of spike absorption circuit; the other end of spike absorption circuit is connected to one end of capacitor C2; the other end of capacitor C2 is connected to one end of inductor BL1; and the other end of inductor BL1 is connected to pin 2 of the first control chip. One end of the auxiliary winding TB1 is connected to one end of resistor R4, one end of resistor R6, and one end of capacitor C4; the other end of resistor R4 is connected to one end of resistor R5 and the positive terminal of diode D2; the other end of resistor R5 is connected to one end of capacitor C5, the other end of capacitor C5 is connected to the negative terminal of diode D2, one end of electrolytic capacitor EC4, one end of capacitor C7, and one end of inductor L2, and the other end of inductor L2 is connected to pin 14 of the first control chip; the other end of resistor R6 is connected to one end of resistor R7, one end of capacitor C6, and connected to pin 17 of the first control chip; one end of resistor R8 is connected to pin 16 of the first control chip, and the other end is grounded; one end of capacitor C8 is connected to pin 15 of the first control chip, and the other end is grounded. The other end of the auxiliary winding TB1 is connected to the other end of capacitor C4, the other end of resistor R7, the other end of electrolytic capacitor EC4, the other end of capacitor C7, and resistor R8 and grounded.

[0021] In the primary control module, the AC input first passes through a fuse for overcurrent / short-circuit protection, then through a common-mode inductor to filter out differential-mode and common-mode conducted interference, reducing the overall EMI level. The filtered AC power enters the rectifier bridge BD1, where it is rectified into pulsating DC power. A π-type filter network consisting of three high-voltage electrolytic capacitors and one I-type inductor then forms a stable high-voltage DC power supply before entering the transformer T1. After passing through the transformer, the AC power flows through BL1 to the GaN transistor built into the IC, and finally returns to ground. An NTC thermistor suppresses surge current during power-on. D1, R1, R2, R3, and C1 form a spike absorption circuit to absorb the spike pulse generated during the instantaneous switching of the GaN circuit. The voltage fed back from the auxiliary winding of T1B passes through R4 and is rectified by D2 before entering EC4, C7, and L2 for energy storage, and then enters Pin14 to power the IC. D2, EC4, and L2 form a boost circuit to prevent insufficient voltage supplied to the IC. R6 is the upper bias resistor, and R7 is the lower bias resistor. By adjusting the resistance values ​​of R6 and R7, the start-up input voltage and output OVP can be adjusted via Pin17. R8 is connected to Pin16 and can control the primary OCP to avoid core saturation.

[0022] The second end of the synchronous rectification module is connected to the SRG pin (synchronous rectification gate drive pin) of the first control chip in the feedback and control module; the synchronous rectification module is used to drive the external MOS transistor Q1 to perform high-frequency switching rectification based on the output voltage of the SRG pin of the first control chip, and provide it to the high-frequency chopper module; Here, the synchronous rectification module, such as Figure 2 As shown, the circuit includes: the gate of MOSFET Q1 is connected to the synchronous rectification gate drive pin (SRG) of the first control chip; the drain of MOSFET Q1 is connected to transformer T1 and one end of resistor R9; the other end of resistor R9 is connected to one end of capacitor C9; the other end of capacitor C9 is connected to the source of MOSFET Q1 and one end of the rectification and voltage regulation circuit; the other end of the rectification and voltage regulation circuit is connected to transformer T1. The rectification and voltage regulation circuit includes: the positive terminal of Zener diode ZD1 is connected to one end of capacitor C10; the other end of capacitor C10 is connected to the input voltage VIN; the negative terminal of Zener diode ZD1 is connected to the negative terminal of diode D3; the positive terminal of diode D3 is connected to transformer T1.

[0023] In some possible implementations, the main control IC outputs through pin 22 to drive the external MOSFET Q1 for high-frequency switching rectification. The rectified voltage forms the secondary DC bus voltage, which is supplied to the subsequent chopper voltage regulation module. In addition, D3, ZD1 and C10 form a rectification and voltage regulation circuit to provide energy for the IC secondary and protocol.

[0024] The high-frequency chopper module consists of two independent chopper paths composed of four low-voltage MOSFETs. Each output has two MOSFETs connected in series between the secondary DC bus and the output filter capacitor to perform high-speed switching chopping of the bus voltage. The voltage is then filtered by the capacitor to output DC voltage.

[0025] Here, there are 4 low-voltage MOSFETs, such as Figure 2 As shown, it includes: MOSFETs Q2, Q3, Q4 and Q5; wherein, each output is configured with two low-voltage MOSFETs connected in series between the secondary DC bus and the output interface to form a unidirectional chopper switch path; the switching states of MOSFETs Q2 and Q4 are controlled by the high-frequency drive signals output by the first control chip through pins 27 and 28, and the switching states of MOSFETs Q3 and Q5 are controlled by the high-frequency drive signals output by the first control chip through pins 24 and 23.

[0026] High-frequency chopper modules, such as Figure 2 As shown, it includes resistors R13 and R14, which are used to control the drive current of each MOSFET; Resistors R15 and R16 are gate pull-down resistors, used to discharge the gate voltage of each MOSFET to the source when the drive signal disappears, thus preventing the MOSFETs from being mistakenly turned on. Clamping diodes ZD2 and ZD3 are used to prevent the MOSFETs from being damaged by excessively high drive voltage. A Zener diode is connected across resistors R15 and R16, with its anode connected to one end of a low-frequency filter capacitor and one end of a high-frequency decoupling capacitor. The other end of the low-frequency filter capacitor is grounded, and the other end of the high-frequency decoupling capacitor is connected to the protocol control module. For example... Figure 2 As shown, the low-frequency filter capacitors are capacitors C19 and C20; the high-frequency decoupling capacitors are capacitors EC5 and EC6.

[0027] The high-frequency chopper module consists of four low-voltage NMOS transistors forming a dual-path independent chopper circuit. Each output corresponds to two MOS transistors connected in series to form a chopper branch, which is connected between the secondary DC bus and the output filter capacitor. It is responsible for high-speed switching chopping of the bus voltage, and then the output is stable DC after energy storage and filtering by the capacitor.

[0028] In this circuit, Q2 and Q4 are controlled by the main control IC through pins 27 and 28, which directly output high-frequency drive signals Dsw1 and Dsw2 to control the switches. Q3 and Q5 output high-frequency drive signals through pins 24 and 23. The voltage of the capacitor connected in series with these transistors cannot change abruptly, so the voltage on the right side of the capacitor also increases synchronously to reach the MOSFET's startup voltage, thus turning it on. R13 and R14 control the MOSFET's drive current to optimize the switching speed. R15 and R16 are gate pull-down resistors that discharge the gate voltage to the source when the drive signal disappears, preventing the MOSFET from being mis-turned on. ZD2 and ZD3 are clamping diodes to prevent the MOSFET from being damaged by excessively high drive voltage.

[0029] The feedback and control module is used to compare the sampled bus voltage with the sampled output voltage based on the voltage provided by the primary control module, so that the DSW pin in the first control chip outputs a high-frequency PWM drive signal to the high-frequency chopper module. Here, the feedback and control module receives power from the rectified voltage D3 via C10 into Pin 31 of the first control chip, providing energy for IC startup. The bus voltage sampled via Pin 30 is compared with Vo1 (output voltage sampling feedback pin) and Vo2 sampled via Pins 34 and 35 respectively, controlling the output of high-frequency PWM drive signals from Pins 23 / 24 / 27 / 28. R19, R20, R17, and R21 form the feedback loop for Vo1. When the Vo1 output changes, the protocol can feed back a signal to the main control IC (i.e., the first control chip) through this loop. The IC internally controls the duty cycle of the chopper to ensure the output meets requirements. Similarly, R24, R25, R26, and R27 form the feedback loop for Vo2. Additionally, C23, C24, and R22 form the loop compensation loop for Vo1, and C25, C26, and R23 form the loop compensation loop for Vo2, reducing ripple effects.

[0030] In some possible implementations, in the power path of the high-frequency chopper module, each output is configured with two low-voltage NMOS transistors connected in series between the secondary DC bus and the output interface, forming a unidirectional chopper switch path; there is no energy storage inductor, no freewheeling diode, and no independent DC-DC controller. The output is only configured with low-ESR solid-state electrolytic capacitors as filtering and energy storage components, relying on the charging and discharging effect of the capacitors to smooth the chopper pulses. The gate drive signal of the chopper MOS transistors is directly provided by the main power supply control chip, which integrates independent chopper control logic and gate drive circuitry internally, eliminating the need for an additional driver chip.

[0031] The working principle of inductorless voltage regulation is as follows: the main control chip (i.e. the first control chip) outputs a high-frequency PWM drive signal to control the chopper MOSFET to periodically switch on and off at high speed according to the set duty cycle, cutting the fixed DC voltage of the secondary DC bus into a high-frequency pulse voltage sequence with an amplitude equal to the bus voltage and a duty cycle of D; the pulse voltage is directly applied to the output filter capacitor and the load terminals, and the waveform is smoothed by utilizing the characteristic of the capacitor that "voltage cannot change abruptly", so as to output a stable DC voltage.

[0032] The average output voltage satisfies the relationship: Vout = Vbus × duty cycle D.

[0033] The closed-loop voltage regulator chip uses an internal feedback loop to sample the output voltage in real time. After amplifying the error between the output voltage and the internal reference voltage, it dynamically adjusts the duty cycle of the chopper signal: if the output voltage is too high, the duty cycle is reduced; if the output voltage is too low, the duty cycle is increased, thus achieving closed-loop voltage regulation.

[0034] The main control chip integrates a primary PWM controller and a high-voltage gallium nitride power transistor, which, together with a flyback transformer, achieves isolated energy transfer. Through built-in digital isolation communication, it enables reverse control of the primary side by the secondary side, achieving zero-voltage switching (ZVS) on the primary side and reducing switching losses. The main control chip also integrates a synchronous rectifier controller, driving an external synchronous rectifier diode to rectify the secondary voltage of the transformer, resulting in a stable secondary DC bus.

[0035] The second control chip in the protocol control module is communicatively connected to the first control chip. The second control chip is used to control the conduction state of the MOS transistor Q6 or Q7 connected to the high-frequency chopper module based on the input voltage provided by the synchronous rectification module, so that the high-frequency chopper module outputs DC power to the load.

[0036] Here, the protocol control module is responsible for port protocol identification through a dual-port protocol chip and communicates with the main control chip to achieve power allocation: when a single port is working, the corresponding channel outputs full power, with a maximum power of 45 watts (W).

[0037] In some possible implementations, the protocol control module is used to identify the port protocol, communicate with the first control chip through the second control chip to achieve power distribution, and output full power to the corresponding channel when working with a single port; the second control chip draws power from capacitor C10 through pin 3 and provides power supply through capacitor C29. The second control chip is used to turn on MOSFET Q6 or Q7 through the output voltage of pin 16 or 18 when a voltage is sampled at pin 17 or 19, based on the feedback signal from pins 12-15 or 20-23, so that the DC power supply after high-frequency chopping is output to the external load. Pins 4 and 5 are connected in series with a thermistor for over-temperature protection. Pins 6 and 7 provide feedback signals to the output voltage terminals Vo1 and Vo2 respectively, and the output voltage is adjusted by adjusting the duty cycle. The output current is controlled by detecting the voltage across the alloy resistor through pins 10 and 11 and 24 and 25 respectively, so as to realize overcurrent protection.

[0038] The protocol control module is used for port protocol identification and communication with the main control chip to achieve power distribution; when operating on a single port, it outputs full power to the corresponding channel, up to 45W. The chip draws power from C10 via Pin 3 (VIN, input voltage pin), and C29 is used to stabilize the power supply. When a voltage is sampled at pin 17 or 19, based on the feedback signal from pins 12-15 or 20-23, a voltage is output through pin 16 or 18, causing Q6 or Q7 to conduct, allowing the DC power supply after high-frequency chopping to output to the load. An NTC resistor is connected in series between pins 4 and 5 for over-temperature protection, and pins 6 and 7 provide feedback signals to Vo1 and Vo2 respectively, adjusting the output voltage by adjusting the duty cycle. The voltage across the alloy resistor can also be detected through pins 10 and 11 and pins 24 and 25 to control primary overcurrent protection (OCP).

[0039] like Figure 2 As shown, the first control chip U2 is a dual-channel motor driver chip. In the protocol control module, TYPE1 and TYPEC2 are interfaces for a USB Type-C 16-pin female connector, which includes the following key functional pins: Power and ground: A9 / B9 is VBUS (positive power supply), and A12 / B12 / GND is ground, used to provide a maximum current of 5A and power transmission of 100W; USB 2.0 data cable: A6 / B6 is DP (data positive), A7 / B7 is DN (data negative), used for compatibility with traditional USB devices; USB PD communication cable: A5 / B5 are CC1 / CC2, used to identify the insertion direction and negotiate voltage and current, which is the core of realizing fast charging; High-speed data cable: A2 / A3 / B2 / B3 are TX / RX differential pairs, supporting USB 3.0 or DP alternating mode to achieve high-speed data transmission or video output.

[0040] In this embodiment of the invention, the SC3107 chip integrates the primary-side PWM controller, gallium nitride power transistor, digital isolation communication, secondary synchronous rectification controller, and secondary high-frequency chopper driver into a single package. The secondary side eliminates the traditional independent DC-DC control chip and energy storage inductor, relying solely on an external MOSFET switching array and output filter capacitor, directly driven by the main control chip to achieve high-frequency chopping voltage regulation. Simultaneously, internal phase control within the chip enables natural commutation of the dual-output circuit and intelligent power distribution. This inductor-free high-frequency chopper voltage regulation topology completely eliminates the energy storage inductor in the DC-DC circuit, achieving secondary voltage regulation solely through high-frequency chopping by the switching transistor and filtering by the output capacitor. This topology-level breakthrough overcomes the inductor dependence bottleneck of the traditional Buck design, eliminating the independent secondary Buck DC-DC circuit and its energy storage inductor, simplifying the number of components, reducing costs, and shrinking the power supply size. It also reduces first-stage power conversion losses, improves overall conversion efficiency, and meets energy efficiency standards of level VI and above.

[0041] Optionally, the transmission medium can be a wired link (e.g., but not limited to, coaxial cable, optical fiber, and Digital Subscriber Line (DSL)) or a wireless link (e.g., but not limited to, Wireless Fidelity (WIFI), Bluetooth, and mobile device networks). It should be noted that the control device provided in the above embodiments is only an example illustrating the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device can be divided into different functional modules to complete all or some of the functions described above. Furthermore, the method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process is detailed in the method embodiments, and will not be repeated here.

[0042] This invention provides a computer device. Exemplarily, the computer device includes: a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the processor executes the computer program, the computer device can execute any of the aforementioned 45W dual-channel power supplies without step-down inductors.

[0043] This invention also protects a control device, which may include a memory and a processor. The memory stores executable program code, and the processor is used to call and execute the executable program code to execute a 45W dual-channel power supply without a step-down inductor provided in this invention. This invention can divide the control device into functional modules according to the above method examples. For example, each function can be assigned to a separate module, or two or more functions can be integrated into a processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this invention is illustrative and only represents a logical functional division; other division methods may exist in actual implementation. It should also be noted that all relevant content of each step involved in the above method embodiments can be referenced to the functional description of the corresponding functional module, and will not be repeated here. It should be understood that the control device provided in this invention is used to execute the above-mentioned 45W dual-channel power supply without a step-down inductor, and therefore can achieve the same effect as the above implementation method. When using integrated units, the control device may include a processing module and a storage module. When the control device is applied to a device, the processing module can be used to control and manage the device's actions. The storage module can be used to support the execution of mutual program code by the device. The processing module can be a processor or controller, which can implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this invention. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of Digital Signal Processing (DSP) and microprocessors, etc., and the storage module can be a memory.

[0044] Furthermore, the control device provided in the embodiments of the present invention may specifically be a chip, component, or module. The chip may include a connected processor and a memory. The memory stores instructions, and when the processor calls and executes the instructions, the chip can execute a 45W dual-channel power supply without a step-down inductor provided in the above embodiments. The embodiments of the present invention also provide a computer-readable storage medium storing computer program code. When the computer program code is executed on a computer, the computer executes the aforementioned method steps to implement a 45W dual-channel power supply without a step-down inductor provided in the above embodiments.

[0045] This invention also provides a computer program product. When the computer program product is run on a computer, it causes the computer to execute the aforementioned related steps to achieve a 45W dual-channel power supply without a step-down inductor provided in the above embodiments. The control device, computer-readable storage medium, computer program product, or chip provided in this invention are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they achieve can be referred to in the beneficial effects of the corresponding methods provided above, and will not be repeated here. Through the description of the above embodiments, those skilled in the art can understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the control device can be divided into different functional modules to complete all or some of the functions described above. In the embodiments provided by this invention, it should be understood that the disclosed control device and method can be implemented in other ways. For example, the control device embodiments described above are merely illustrative. For example, the division of modules or units is merely a logical functional division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another control device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, control device or unit, and can be electrical, mechanical or other forms.

[0046] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multiple task processing and parallel processing are possible or may be advantageous. The various embodiments in this specification are described in a progressive manner, and similar modules between different embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The above content is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A 45W dual-channel power supply without a step-down inductor, characterized in that, include: The module comprises a primary control module, a synchronous rectification module, a high-frequency chopper module, a feedback and control module, and a protocol control module, among which: One end of the primary control module is connected to the first end of the synchronous rectification module, and the other end is connected to the feedback and control module. It is used to filter and rectify the input AC point to obtain pulsating DC. The pulsating DC is converted into stable high-voltage DC by a filter network and enters the transformer T1. After passing through the transformer T1, it enters the first control chip in the feedback and control module through the inductor BL1. The second end of the synchronous rectification module is connected to the SRG pin of the first control chip in the feedback and control module; the synchronous rectification module is used to drive the external MOS transistor Q1 to perform high-frequency switching rectification based on the output voltage of the SRG pin of the first control chip, and provide it to the high-frequency chopper module; The high-frequency chopper module consists of two independent chopper paths composed of four low-voltage MOSFETs. Each output has two MOSFETs connected in series between the secondary DC bus and the output filter capacitor to perform high-speed switching chopping of the bus voltage. The voltage is then filtered by the capacitor to output DC voltage. The feedback and control module is used to compare the sampled bus voltage with the sampled output voltage based on the voltage provided by the primary control module, so that the DSW pin in the first control chip outputs a high-frequency PWM drive signal to the high-frequency chopper module. The second control chip in the protocol control module is communicatively connected to the first control chip. The second control chip is used to control the conduction state of the MOS transistor Q6 or Q7 connected to the high-frequency chopper module based on the input voltage provided by the synchronous rectification module, so that the high-frequency chopper module outputs DC power to the load.

2. The power supply according to claim 1, characterized in that, Synchronous rectification module, including: The gate of MOSFET Q1 is connected to the synchronous rectifier gate drive pin (SRG) of the first control chip. The drain of MOSFET Q1 is connected to transformer T1 and one end of resistor R9. The other end of resistor R9 is connected to one end of capacitor C9. The other end of capacitor C9 is connected to the source of MOSFET Q1 and one end of the rectifier and voltage regulator circuit. The other end of the rectifier and voltage regulator circuit is connected to transformer T1.

3. The power supply according to claim 2, characterized in that, The rectifier and voltage regulator circuit includes: The positive terminal of Zener diode ZD1 is connected to one end of capacitor C10, and the other end of capacitor C10 is connected to the input voltage VIN; the negative terminal of Zener diode ZD1 is connected to the negative terminal of diode D3, and the positive terminal of diode D3 is connected to transformer T1.

4. The power supply according to claim 1, characterized in that, Four low-voltage MOSFETs, including MOSFETs Q2, Q3, Q4 and Q5; wherein, each output is configured with two low-voltage MOSFETs connected in series between the secondary DC bus and the output interface to form a unidirectional chopper switch path; MOSFETs Q2 and Q4 are controlled by the high-frequency drive signals output by the first control chip through pins 27 and 28 to control their switching states. MOSFETs Q3 and Q5 are controlled by the high-frequency drive signals output by the first control chip through pins 24 and 23 to control their switching states.

5. The power supply according to claim 4, characterized in that, The high-frequency chopper module includes: Resistors R13 and R14 are used to control the drive current of each MOSFET; Resistors R15 and R16 are gate pull-down resistors, used to discharge the gate voltage of each MOSFET to the source when the drive signal disappears, so as to avoid the MOSFET from being mis-turned on; clamping micro-voltage diodes ZD2 and ZD3 are used to prevent the MOSFET from being damaged by excessive drive voltage.

6. The power supply according to claim 5, characterized in that, The high-frequency chopper module also includes: a Zener diode connected across the two ends of resistors R15 and R16 respectively, the positive terminal of which is connected to one end of a low-frequency filter capacitor and one end of a high-frequency decoupling capacitor, the other end of which is grounded, and the other end of which is connected to the protocol control module.

7. The power supply according to claim 1, characterized in that, The primary control module includes: One end of fuse F1 is connected to AC power, and the other end is connected to the first terminal of common mode inductor LF1. The second terminal of common mode inductor LF1 is connected to thermistor RT1. The third terminal of common mode inductor LF1 is connected to one end of rectifier bridge BD1. The other end of rectifier bridge BD1 is connected to one end of inductor L1, one end of electrolytic capacitor EC1, and one end of resistor R1. The other end of inductor L1 is connected to the other end of resistor R1, one end of electrolytic capacitor EC2, one end of electrolytic capacitor EC3, and one end of spike absorption circuit. The other end of spike absorption circuit is connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of inductor BL1. The other end of inductor BL1 is connected to pin 2 of the first control chip. One end of the auxiliary winding TB1 is connected to one end of resistor R4, one end of resistor R6, and one end of capacitor C4; the other end of resistor R4 is connected to one end of resistor R5 and the positive terminal of diode D2; the other end of resistor R5 is connected to one end of capacitor C5, the other end of capacitor C5 is connected to the negative terminal of diode D2, one end of electrolytic capacitor EC4, one end of capacitor C7, and one end of inductor L2, and the other end of inductor L2 is connected to pin 14 of the first control chip; the other end of resistor R6 is connected to one end of resistor R7, one end of capacitor C6, and connected to pin 17 of the first control chip; one end of resistor R8 is connected to pin 16 of the first control chip, and the other end is grounded; one end of capacitor C8 is connected to pin 15 of the first control chip, and the other end is grounded. The other end of the auxiliary winding TB1 is connected to the other end of capacitor C4, the other end of resistor R7, the other end of electrolytic capacitor EC4, the other end of capacitor C7, and resistor R8 and grounded.

8. The power supply according to claim 1, characterized in that, The protocol control module is used to identify the port protocol and communicate with the first control chip through the second control chip to achieve power distribution. When working with a single port, the corresponding channel outputs full power. The second control chip draws power from capacitor C10 through pin 3 and provides power supply through capacitor C29. The second control chip is used to turn on MOSFET Q6 or Q7 through the output voltage of pin 16 or 18 when a voltage is sampled at pin 17 or 19, based on the feedback signal from pins 12-15 or 20-23, so that the DC power supply after high-frequency chopping is output to the external load. Pins 4 and 5 are connected in series with a thermistor for over-temperature protection. Pins 6 and 7 provide feedback signals to the output voltage terminals Vo1 and Vo2 respectively, and the output voltage is adjusted by adjusting the duty cycle. The output current is controlled by detecting the voltage across the alloy resistor through pins 10 and 11 and 24 and 25 respectively, so as to realize overcurrent protection.

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