CN116317018A - Multi-power supply port control circuit, electronic equipment and control method for main voltage conversion - Google Patents

Abstract

The invention provides a control circuit with multiple power supply ports, electronic equipment and a control method for main voltage conversion, wherein each power supply port is respectively coupled to the output end of a first-stage power conversion module through a corresponding second-stage power conversion unit; one end of the first voltage dividing resistor is coupled to the output end of the first-stage power conversion module, the other end of the first voltage dividing resistor is coupled to one end of the second voltage dividing resistor, the control end of the first-stage power conversion module and one end of the adjusting current source, and the other end of the second voltage dividing resistor is grounded; and the current value of the current source is controlled and regulated only when the voltage required by the equipment accessed by the corresponding power supply ports exceeds the power supply capacity range of the first-stage power conversion module, so that the voltage output by the first-stage power conversion module is regulated. Therefore, aiming at the multiport power supply technology, the invention ensures the normal charging of the equipment and simultaneously reduces the difference between the fixed voltage of the main voltage output and the voltage required by the equipment, thereby improving the realization of the charging efficiency.

Description

Multi-power supply port control circuit, electronic equipment and control method for main voltage conversion

technical field

The invention relates to the technical field of electronic circuits, in particular to a multi-power supply port control circuit, electronic equipment and a control method for main voltage conversion.

Background technique

The existing multi-port charging technology widely uses a multi-port independent power supply architecture, which uses a single main module to provide a fixed output voltage, and multiple sub-modules perform voltage conversion on the main voltage to supply power to external devices.

In order to stabilize the voltage value of the main voltage and optimize the power of the switching power supply, the current common method is to use a control loop with a feedback function. Generally, in the switching power supply where the primary and secondary sides are isolated, the isolation of the power stage is realized through a transformer. The isolation of the feedback signal is mainly realized by an optocoupler. The feedback loop formed by the op amp, the voltage reference and the optocoupler, the main voltage is divided by the resistor, and compared with the reference voltage. The op amp outputs an error voltage signal to control the current flowing through the optocoupler. The current is generated on the primary side through the optocoupler, and the feedback voltage is generated on the resistor. The feedback voltage is then compared with the comparator inside the control chip to generate a duty ratio signal for controlling the switching tube, so that the output voltage can be stabilized within the set voltage range under different loads and different input voltages.

However, when the DC/DC converter in the subsequent circuit converts the main voltage, if the voltage difference between the main voltage and the output voltage of the DC/DC converter is large, the loss ratio of the DC/DC converter will increase , the conversion efficiency decreases, which in turn reduces the charging efficiency.

Nowadays, it is generally used to adjust the resistance value of the voltage dividing resistor to adjust the feedback voltage generated on the resistor, but such an adjustment method often requires a complicated circuit, and can only ensure that the circuit has a limited number of main voltage voltage values.

Therefore, how to solve the problem of reducing the gap between the fixed voltage that meets the main voltage output and the voltage required by the device while ensuring normal charging of the device, and thereby improving the charging efficiency has become an urgent technical problem in the industry.

Contents of the invention

The present invention provides a multi-power supply port control circuit, electronic equipment and a control method for main voltage conversion to solve the problem of reducing the gap between the fixed voltage that meets the main voltage output and the voltage required by the equipment while ensuring normal charging of the equipment , and then improve the technical problem of charging efficiency.

According to the first aspect of the present invention, a multi-power supply port control circuit is provided, including: a first-stage power conversion module, a first voltage divider resistor, a second voltage divider resistor, a second-stage power conversion module, and N power supply ports ;

The second-level power conversion module includes N second-level power conversion units, an adjustable current source, a control unit, and a protocol interface unit, wherein N is an integer greater than or equal to 2;

Each power supply port is respectively coupled to the output end of the first-stage power conversion module through the corresponding second-stage power conversion unit; the first end of the first voltage dividing resistor is coupled to the first-stage power The output end of the conversion module, the second end of the first voltage dividing resistor is coupled to the first end of the second voltage dividing resistor, and the second end of the second voltage dividing resistor is grounded; the second voltage dividing resistor The first terminal of the piezoresistor is also coupled to the control terminal of the first-stage power conversion module and the first terminal of the regulating current source, and the second terminal of the regulating current source is coupled to the control unit. The first terminal, the second terminal of the control unit is coupled to the protocol interface unit, and the third terminal of the regulating current source is grounded; wherein:

The first-stage power conversion module is used to output a first supply voltage;

Each of the second-stage power conversion units is configured to respectively convert the first power supply voltage into a corresponding charging voltage;

The protocol interface unit is used to obtain protocol parameters of devices connected to each power supply port and send them to the control unit;

The control unit is configured to: according to the protocol parameters of the equipment connected to each power supply port, determine whether the voltage required by the corresponding equipment connected to each power supply port is within the power supply capability of the first-stage power conversion module ; and control the current value of the adjustment current source according to the judgment result to adjust the voltage value of the first end of the second voltage dividing resistor;

The first stage power conversion module is used for adjusting the magnitude of the first power supply voltage output by the first stage power conversion module according to the voltage value of the first terminal of the second voltage dividing resistor.

Optionally, according to the protocol parameters of the equipment connected to each power supply port, it is judged whether the voltage required by the equipment connected to the corresponding power supply port is within the power supply capability range of the first-stage power conversion module, specifically:

If the required voltages of the N power supply ports obtained by the protocol interface unit are all less than or equal to the set voltage value, then it is judged that the required voltages of the devices connected to the N power supply ports are all in the first level Within the power supply capability range of the power conversion module, the control unit outputs a first signal to the regulated current source, so that the current value of the regulated current source is 0, so that the first terminal of the second voltage dividing resistor The voltage value is the reference set value;

If the protocol parameters of the equipment connected to each power supply port obtained by the protocol interface unit have a number of equipment connected to the power supply port, the required voltage of which is greater than the set voltage value, then determine whether the corresponding power supply port is connected The required voltage of the device is not within the power supply capability of the first-stage power converter, the control unit outputs a second signal to the regulated current source, so that the current value of the regulated current source changes, so that the The voltage drop across the first voltage dividing resistor becomes larger, the voltage value at the first end of the second voltage dividing resistor is lower than the reference set value, and the output of the first stage power conversion module increases the first power supply voltage The highest requested voltage to the device connected to each power supply port.

Optionally, when the protocol parameters of the devices connected to each power supply port obtained by the protocol interface unit have a required voltage of several devices connected to the power supply port greater than the set voltage value, according to the first The resistance value of the voltage dividing resistor, the control unit outputs a second signal to the adjustment current source, and converts the voltage value to be increased into a corresponding current value of the adjustment current source.

其中，I是所述调节电流源的电流值，R1是所述第一分压电阻的电阻值，ΔV是需要升高的电压值。Optionally, the multi-power supply port control circuit according to claim 3, wherein the current value of the adjustable current source is

Wherein, I is the current value of the regulating current source, R1 is the resistance value of the first voltage dividing resistor, and ΔV is the voltage value to be increased.

Optionally, the first stage power conversion module includes an AC/DC converter and a feedback unit;

The first terminal of the feedback unit is coupled to the first terminal of the second voltage dividing resistor, the second terminal thereof is coupled to the primary side of the AC/DC converter, and the third terminal thereof is coupled to the a secondary side of the AC/DC converter, the first end of the first voltage dividing resistor is coupled to the secondary side of the AC/DC converter;

The feedback unit is used for adjusting the magnitude of the first power supply voltage output by the AC/DC converter according to the voltage value of the first terminal of the second voltage dividing resistor.

Optionally, the feedback unit includes a controllable precision voltage regulator, a photoelectric coupler, a current limiting resistor, and a main power control unit; the output end of the main power control unit is coupled to the original AC/DC converter side; the first end of the optocoupler is coupled to the input end of the main power control unit, the second end is coupled to the first end of the controllable precision voltage regulator, and the third end is coupled to To the first end of the current limiting resistor, the fourth end of which is grounded, the second end of the current limiting resistor is coupled to the secondary side of the AC/DC converter; the first end of the controllable precision voltage regulator Two terminals are coupled to the first terminal of the second voltage dividing resistor, and the third terminal thereof is grounded.

Optionally, the second-stage power conversion unit is a DC/DC converter.

Optionally, the second-level power conversion unit corresponding to the device connected to the highest requested voltage is configured to output the highest requested voltage.

Optionally, a bypass capacitor is also included; the first end of the bypass capacitor is coupled to the output end of the first-stage power conversion module, and the second end of the bypass capacitor is grounded.

Optionally, the power supply port includes a USB TYPE-A interface or a USB TYPE-C interface.

According to a second aspect of the present invention, an electronic device is provided, including the multi-power supply port control circuit provided in any one of the first aspects of the present invention.

According to the third aspect of the present invention, there is provided a control method for main voltage conversion, which controls the multi-power supply port control circuit provided by any one of the first aspect of the present invention, and the method includes:

Obtain the protocol parameters of the devices connected to each power supply port and send them to the control unit;

According to the protocol parameters of the equipment connected to each power supply port, judge whether the voltage required by the equipment connected to each power supply port is within the power supply capability range of the first-stage power conversion module; and control the adjustment according to the judgment result the current value of the current source to adjust the voltage value at the first terminal of the second voltage dividing resistor;

The magnitude of the first power supply voltage output by the first-stage power conversion module is adjusted according to the voltage value of the first terminal of the second voltage dividing resistor.

In the multi-power supply port control circuit, electronic equipment, and control method for main voltage conversion provided by the present invention, each power supply port is respectively coupled to the output end of the first-stage power conversion module through a corresponding second-stage power conversion unit; One end of the first voltage-dividing resistor is coupled to the output end of the first-stage power conversion module, and the other end is coupled to one end of the second voltage-dividing resistor, the control end of the first-stage power conversion module, and one end of the regulating current source. The other end of the voltage dividing resistor is grounded; so that only when the voltage required by the equipment connected to the corresponding power supply port exceeds the power supply capacity range of the first-stage power conversion module, the current value of the current source is controlled to adjust the first-stage power conversion module. The magnitude of the voltage output by the primary power conversion module. Therefore, aiming at the multi-port power supply technology, the present invention not only ensures the normal charging of the equipment, but also takes into account the narrowing of the gap between the fixed voltage output by the main voltage and the voltage required by the equipment, thereby improving the realization of charging efficiency.

Description of drawings

Fig. 1 is a schematic structural diagram of a multi-power supply port control circuit in an embodiment of the present invention;

Fig. 2 is a schematic diagram of the first structure of the multi-power supply port control circuit in another embodiment of the present invention;

Fig. 3 is a second schematic diagram of the structure of the multi-power supply port control circuit in another embodiment of the present invention;

FIG. 4 is a schematic flowchart of a method for controlling changes in main voltages of a multi-power supply port control circuit in an embodiment of the present invention.

Explanation of reference signs:

11-first stage power conversion module;

12-Second stage power conversion module;

121 - the second stage power converter;

122 - regulating current source;

123 - control unit;

124-protocol interface unit;

13-power supply port;

R1- the first voltage divider resistor;

R2- the second voltage divider resistor;

R3-current limiting resistor;

C1- Bypass capacitor.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

The technical solution of the present invention will be described in detail below with specific examples. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

In view of the fact that in the prior art, it is difficult to ensure the normal charging of the equipment while taking into account the narrowing of the gap between the fixed voltage output by the main voltage and the voltage required by the equipment, thereby improving the realization of charging efficiency. The present invention provides a multi-power supply port control circuit, electronic equipment and a control method for main voltage conversion. Each power supply port is respectively coupled to the output end of the first-stage power conversion module through a corresponding second-stage power conversion unit. ; One end of the first voltage dividing resistor is coupled to the output end of the first stage power conversion module, and the other end is coupled to one end of the second voltage dividing resistor, the control end of the first stage power conversion module and one end of the regulating current source, the second The other end of the two-divider resistor is grounded; so that only when the voltage required by the equipment connected to the corresponding power supply port exceeds the power supply capacity range of the first-stage power conversion module, the current value of the current source is controlled to adjust The magnitude of the voltage output by the first-stage power conversion module. Therefore, aiming at the multi-port power supply technology, the present invention not only ensures the normal charging of the equipment, but also takes into account the narrowing of the gap between the fixed voltage output by the main voltage and the voltage required by the equipment, thereby improving the realization of charging efficiency.

Please refer to FIG. 1 , an embodiment of the present invention provides a multi-power supply port control circuit, including: a first-stage power conversion module 11, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, and a second-stage power conversion module 12 and N power supply ports 13;

The second-level power conversion module 12 includes N second-level power conversion units 121, a regulating current source 122, a control unit 123, and a protocol interface unit 124, wherein N is an integer greater than or equal to 2;

Each power supply port 13 is respectively coupled to the output terminal of the first-stage power conversion module 11 through the corresponding second-stage power conversion unit 121; the first end of the first voltage dividing resistor R1 is coupled to the The output end of the first-stage power conversion module 11, the second end of the first voltage dividing resistor R1 is coupled to the first end of the second voltage dividing resistor R2, and the second end of the second voltage dividing resistor R2 is The terminal is grounded; the first terminal of the second voltage dividing resistor R2 is also coupled to the control terminal of the first stage power conversion module 11 and the first terminal of the regulating current source 122 respectively, and the regulating current source 122 The second terminal of the control unit 123 is coupled to the first terminal of the control unit 123, the second terminal of the control unit 123 is coupled to the protocol interface unit 124, and the third terminal of the regulating current source 122 is grounded; wherein:

The first stage power conversion module 11 is used to output a first supply voltage;

Each of the second-stage power conversion units 121 is configured to respectively convert the first power supply voltage into a corresponding charging voltage;

The protocol interface unit 124 is used to obtain protocol parameters of devices connected to each power supply port 13 and send them to the control unit 123;

The control unit 123 is configured to: according to the protocol parameters of the equipment connected to each power supply port 13, determine whether the voltage required by the equipment connected to the corresponding power supply port 13 is within the range of the first-stage power conversion module 11. within the power supply capability; and controlling the current value of the adjusting current source 122 according to the judgment result to adjust the voltage value of the first terminal of the second voltage dividing resistor R2;

The first stage power conversion module 11 is used for adjusting the magnitude of the first power supply voltage output by the first stage power conversion module 11 according to the voltage value of the first terminal of the second voltage dividing resistor R2.

Wherein, in the example shown in FIG. 1 , the control unit 123 accepts the protocol parameters of the devices connected to the corresponding power supply ports 13, and determines whether the corresponding power supply ports 13 are connected according to the protocol parameters of the devices connected to each power supply port 13. Whether the voltage required by the input equipment is within the power supply capability range of the first-stage power conversion module 11, specifically:

If the required voltages of the N power supply ports 13 obtained by the protocol interface unit 124 are all less than or equal to the first power supply voltage, it is determined that the required voltages of the devices connected to the N power supply ports 13 are all within the Within the power supply capability range of the first-stage power conversion module 11, the control unit 123 outputs a first signal to the regulated current source 122, so that the current value of the regulated current source 122 is 0, so that the second branch The voltage value of the first end of piezoresistor R2 is a reference set value;

If the protocol parameters of the devices connected to the power supply ports 13 obtained by the protocol interface unit 124 have a number of power supply ports 13 connected to the equipment whose required voltage is greater than the first power supply voltage, then determine the corresponding power supply ports 13 The required voltage of the connected device is not within the power supply capability of the first-stage power converter, the control unit 123 outputs a second signal to the regulated current source 122, so that the current of the regulated current source 122 The value changes, so that the voltage drop across the first voltage dividing resistor R1 becomes larger, the voltage value at the first end of the second voltage dividing resistor R2 is lower than the reference set value, and the first stage power The conversion module 11 outputs the first power supply voltage up to the highest request voltage of the device connected to each power supply port 13 . Wherein, the transmission of the signal output by the control unit 123 may be a wireless transmission mode, and of course may also be a wired transmission mode, which is not limited in the present invention.

The control unit 123 controls the current value of the regulated current source 122 to increase the voltage drop across the first voltage dividing resistor R1, because at the moment when the current value of the regulated current source 122 changes , the first power conversion module 11 outputs the first power supply voltage unchanged, and the current value flowing through the first voltage dividing resistor R1 becomes larger, so that the voltage drop across the first voltage dividing resistor R1 becomes larger , at this instant the voltage value at the first terminal of the second voltage dividing resistor R2 decreases, and the first power conversion module 11 responds to the change in the voltage value at the first terminal of the second voltage dividing resistor R2, at the When the voltage value at the first end of the second voltage dividing resistor R2 decreases, the first power supply voltage output by the first-stage power conversion module 11 is controlled to rise, so that the first power supply output by the first-stage power conversion module 11 The voltage meets the power supply requirements.

In one embodiment, when the protocol parameters of the equipment connected to each power supply port 13 obtained by the protocol interface unit 124 have a number of equipment connected to the power supply port 13 whose required voltage is greater than the first power supply voltage, According to the resistance value of the first voltage dividing resistor R1, the control unit 123 outputs a second signal to the regulated current source 122, and converts the voltage value that needs to be raised to the corresponding current value of the regulated current source 122 .

In this case, the current value of the adjusted current source 122 is

Wherein, I is the current value of the regulating current source 122 , R1 is the resistance value of the first voltage dividing resistor R1 , and ΔV is the voltage value to be increased.

As an example, the power supply port 13 may be a USB TYPE-A interface or a USB TYPE-C interface. The present invention does not limit the interface type of the power supply port 13, and any conceivable interface is within the protection scope of the present invention.

As a preferred implementation manner, as shown in FIG. 1 , the multi-power supply port control circuit further includes a bypass capacitor C1; the first end of the bypass capacitor C1 is coupled to the output of the first-stage power conversion module 11 terminal, the second end of which is grounded; wherein, if the bypass capacitor C1 is a large capacitor, low-frequency interference signals can be filtered; if the bypass capacitor C1 is a small capacitor, high-frequency interference signals can be filtered out.

In one embodiment, please refer to FIG. 2 , the first-stage power conversion module 11 includes an AC/DC converter 111 and a feedback unit 112;

The first terminal of the feedback unit 112 is coupled to the first terminal of the second voltage dividing resistor R2, the second terminal thereof is coupled to the primary side of the AC/DC converter 111, and the third terminal thereof is coupled to To the secondary side of the AC/DC converter 111, the first end of the first voltage dividing resistor R1 is coupled to the secondary side of the AC/DC converter 111;

The feedback unit 112 is used for adjusting the magnitude of the first power supply voltage output by the AC/DC converter 111 according to the voltage value of the first terminal of the second voltage dividing resistor R2.

Regarding the case where the first-stage power conversion module 11 includes an AC/DC converter 111 , in an implementation manner, please refer to FIG. 2 , the second-stage power conversion unit 121 is a DC/DC converter. In one example, the DC/DC converter has a BUCK structure.

In this case, in order to improve charging efficiency and ensure fast charging of connected devices, the second-stage power conversion unit 121 corresponding to the device connected to each power supply port 13 converts the first power supply voltage to respectively converted into corresponding charging voltages to support fast charging of each port; wherein, the second-level power conversion unit 121 corresponding to the device connected to the highest requested voltage is configured to output the highest requested voltage.

Regarding the feedback unit 112, please refer to FIG. 3 for an example, the feedback unit 112 includes a controllable precision voltage regulator 1121, a photocoupler 1122, a current limiting resistor R3 and a main power control unit 1123; The output end of the power control unit 1123 is coupled to the primary side of the AC/DC converter 111; the first end of the photocoupler 1122 is coupled to the input end of the main power control unit 1123, and its second end It is coupled to the first end of the controllable precision voltage regulator 1121, its third end is coupled to the first end of the current limiting resistor R3, its fourth end is grounded, and the second end of the current limiting resistor R3 end coupled to the secondary side of the AC/DC converter 111; the second end of the controllable precision voltage regulator 1121 is coupled to the first end of the second voltage dividing resistor R2, and its third end is grounded .

Wherein, the optocoupler 1122 is used for level conversion and electrical isolation to drive the main power control unit 1123 and ensure the safety of the circuit.

In this case, the feedback unit 112 adjusts the magnitude of the first power supply voltage output by the first-stage power conversion module 11 according to the voltage value of the first end of the second voltage dividing resistor R2, specifically:

The controllable precision voltage regulator 1121 outputs a corresponding current according to the voltage value at the first end of the second voltage dividing resistor R2,

When the required voltages of the devices connected to the power supply port 13 are all within the power supply capability range of the first-stage power conversion module 11, the control unit 123 controls to output the first signal to the regulated current source 122, Make the current value of the adjustable current source 122 0, so that the voltage value of the first end of the second voltage dividing resistor R2 is a reference set value; the photocoupler 1122 receives the controllable precision voltage regulator The current output by the source 1121 is transmitted to the input end of the main power control unit 1123, and the main power control unit 1123 controls the duty ratio of the primary side output voltage of the AC/DC converter 111 to be dynamically stable, and the AC The secondary side of the /DC converter 111 outputs the first power supply voltage as the set voltage value;

When the required voltage of the equipment connected to the power supply port 13 is not within the power supply capability of the first stage power conversion module 11, the control unit 123 outputs the second signal to the regulated current source 122, so that the The current value of the adjustable current source 122 changes, so that the voltage drop across the first voltage dividing resistor R1 becomes larger, and the voltage value at the first end of the second voltage dividing resistor R2 is lower than the reference set value , the corresponding output current of the controllable precision voltage regulator 1121 becomes smaller, the photocoupler 1122 receives the current and transmits it to the input terminal of the main power control unit 1123, and the main power control unit 1123 controls the The duty cycle of the output voltage of the primary side of the AC/DC converter 111 is increased, so that the voltage value of the first supply voltage output by the secondary side of the AC/DC converter 111 is the highest requested voltage;

Wherein, the highest requested voltage is the maximum value of the voltage requested by the device among several devices whose required voltage is greater than the first supply voltage according to the protocol parameters of the connected device.

In the example shown in FIG. 3 , the main power control unit 1123 is coupled to the primary side of the AC/DC converter 111 through an NMOS switch, and the photocoupler 1122 includes a light source and a light receiver. The main power supply control unit 1123 changes the width of the output PWM control signal, controls the frequency of closing or conducting the NMOS switch tube, thereby changing the duty cycle of the primary output voltage of the AC/DC converter 111, and then Make the voltage value of the first power supply voltage output by the secondary side of the AC/DC converter 111 .

Of course, the present invention does not limit the types of the controllable precision voltage regulator 1121, the photocoupler 1122 and the main power control unit 1123, and any conceivable devices are covered by the protection of the present invention. Within the range, for example, the controllable precision voltage regulator 1121 can be TL431 chip, TP1550 chip, etc., the photocoupler 1122132 can be EL817S1 (C) (TU), etc., and the main power control unit 1123 can be The feedback unit 112 includes the circuit of the UC3842A chip, the circuit of the CRE6959VH-S2 chip, etc., and the feedback unit 112 is an existing disclosed technology, and the present application will not repeat them here.

In this case, compared with the fixed power output by the first-stage power conversion module, when the required voltage of the equipment connected to the power supply port 13 is lower, the corresponding output voltage required by the second-stage power converter is lower In the case of low energy conversion efficiency, the multi-power supply port control circuit provided by the present invention can control the set voltage value output by the first-stage power conversion module to be lower. Once the voltage value required by the device is higher than this If the voltage value is set, the voltage value output by the first-stage power conversion module is the highest requested voltage, and the second-stage power converters corresponding to other connected devices step down the highest requested voltage, which can improve energy conversion efficiency, While ensuring the normal charging of the device, the gap between the fixed voltage output by the main voltage and the voltage required by the device is also taken into account, thereby improving the realization of charging efficiency.

In addition, an embodiment of the present invention also provides a control method for main voltage conversion, which is used to control the multi-power supply port control circuit of any one of the embodiments shown in FIG. 1 and FIG. 3 , the control method includes the following steps:

Obtain the protocol parameters of the devices connected to each power supply port and send them to the control unit;

According to the protocol parameters of the equipment connected to each power supply port, judge whether the voltage required by the equipment connected to each power supply port is within the power supply capability range of the first-stage power conversion module; and control the adjustment according to the judgment result the current value of the current source to adjust the voltage value at the first terminal of the second voltage dividing resistor;

The magnitude of the first power supply voltage output by the first-stage power conversion module is adjusted according to the voltage value of the first terminal of the second voltage dividing resistor.

As a specific implementation, please refer to FIG. 4. In actual use, the control method for controlling the multi-power supply port shown in FIG. 1 is controlled by using the main voltage conversion control method provided by the embodiment of the present invention, including the following steps:

S21: power on;

After power-on, the multi-power supply port control circuit works normally;

S22: Obtain the protocol parameters of the device connected to the corresponding power supply port;

Specifically, the protocol interface unit 124 detects the protocol parameters of the equipment connected to each power supply port 13 and sends it to the control unit 123;

S23: Whether the voltage required by the equipment connected to the corresponding power supply port 13 is within the power supply capability of the first-stage power conversion module 11; if not, go to S24, and if so, go back to S22;

Specifically, according to the protocol parameters of the equipment connected to each power supply port 13, it is judged whether the voltage required by the equipment connected to each power supply port 13 is within the power supply capability range of the first-stage power conversion module 11:

If the required voltages of the N power supply ports 13 obtained by the protocol interface unit 124 are all less than or equal to the set voltage value, it is determined that the required voltages of the devices connected to the N power supply ports 13 are all within the Within the power supply capability range of the first-stage power conversion module 11, control the control unit 123 to output a first signal to the regulation current source 122, so that the current value of the regulation current source 122 is 0, so that the first The voltage value of the first end of the two voltage divider resistor R2 is a reference set value, and returns to S22;

If the protocol parameters of the equipment connected to each power supply port 13 obtained by the protocol interface unit 124 have the required voltage of the equipment connected to the power supply port 13 greater than the set voltage value, then determine the corresponding power supply port 13. The required voltage of the connected equipment is not within the power supply capability range of the first-stage power converter, then enter S24;

S24: controlling and adjusting the current value of the current source 122;

Specifically, the control unit 123 outputs a second signal to the regulated current source 122, so that the current value of the regulated current source 122 changes, the voltage drop across the first voltage dividing resistor R1 becomes larger, and the The voltage value of the first terminal of the second voltage dividing resistor R2 is lower than the reference set value, and the first power supply voltage output by the first stage power conversion module 11 is adjusted to increase to the highest value of the equipment connected to each power supply port 13. Request voltage, and return to S22.

Wherein, as an implementation manner, S24 specifically includes: when the protocol parameters of the equipment connected to each power supply port 13 obtained by the protocol interface unit 124, there are several required voltages of the equipment connected to the power supply port 13 that are greater than the When setting the voltage value, according to the resistance value of the first voltage dividing resistor R1, the control unit 123 outputs a second signal to the adjustment current source 122, and converts the voltage value that needs to be increased into the corresponding adjustment value. The current value of the current source 122 .

In addition, an embodiment of the present invention also provides a charging device, including the above-mentioned multi-power supply port control circuit. As an example, the device can be a power strip, a multi-socket socket, a multi-line charging treasure, and of course it can also be other devices that need multi-port power supply.

To sum up, in the multi-power supply port control circuit, electronic equipment and main voltage conversion control method provided by the present invention, each power supply port is respectively coupled to the first-stage power conversion unit through the corresponding second-stage power conversion unit The output end of the module; one end of the first voltage dividing resistor is coupled to the output end of the first-stage power conversion module, and the other end is coupled to one end of the second voltage dividing resistor, the control end of the first-stage power conversion module and the adjustment current source One end of the second voltage dividing resistor and the other end of the second voltage dividing resistor are grounded; so that only when the voltage required by the equipment connected to the corresponding power supply ports exceeds the power supply capability range of the first-stage power conversion module, the current of the current source is controlled and adjusted value to adjust the magnitude of the voltage output by the first-stage power conversion module. Therefore, aiming at the multi-port power supply technology, the present invention not only ensures the normal charging of the equipment, but also takes into account the narrowing of the gap between the fixed voltage output by the main voltage and the voltage required by the equipment, thereby improving the realization of charging efficiency.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (12)

1. A multi-power supply port control circuit is characterized in that, comprising: a first-stage power conversion module, a first voltage divider resistor, a second voltage divider resistor, a second-stage power conversion module, and N power supply ports; The second-level power conversion module includes N second-level power conversion units, an adjustable current source, a control unit, and a protocol interface unit, wherein N is an integer greater than or equal to 2; Each power supply port is respectively coupled to the output end of the first-stage power conversion module through the corresponding second-stage power conversion unit; the first end of the first voltage dividing resistor is coupled to the first-stage power The output end of the conversion module, the second end of the first voltage dividing resistor is coupled to the first end of the second voltage dividing resistor, and the second end of the second voltage dividing resistor is grounded; the second voltage dividing resistor The first terminal of the piezoresistor is also coupled to the control terminal of the first-stage power conversion module and the first terminal of the regulating current source, and the second terminal of the regulating current source is coupled to the control unit. The first terminal, the second terminal of the control unit is coupled to the protocol interface unit, and the third terminal of the regulating current source is grounded; wherein: The first-stage power conversion module is used to output a first supply voltage; Each of the second-stage power conversion units is configured to respectively convert the first power supply voltage into a corresponding charging voltage; The protocol interface unit is used to obtain protocol parameters of devices connected to each power supply port and send them to the control unit; The control unit is configured to: according to the protocol parameters of the equipment connected to each power supply port, determine whether the voltage required by the corresponding equipment connected to each power supply port is within the power supply capability of the first-stage power conversion module ; and control the current value of the adjustment current source according to the judgment result to adjust the voltage value of the first end of the second voltage dividing resistor; The first stage power conversion module is used for adjusting the magnitude of the first power supply voltage output by the first stage power conversion module according to the voltage value of the first terminal of the second voltage dividing resistor. 2. The multi-power supply port control circuit according to claim 1, characterized in that, according to the protocol parameters of the equipment connected to each power supply port, it is judged whether the voltage required by the equipment connected to each corresponding power supply port is within the first Within the scope of the power supply capability of the primary power conversion module, specifically: If the required voltages of the N power supply ports obtained by the protocol interface unit are all less than or equal to the set voltage value, then it is judged that the required voltages of the devices connected to the N power supply ports are all in the first level Within the power supply capability range of the power conversion module, the control unit outputs a first signal to the regulated current source, so that the current value of the regulated current source is 0, so that the first terminal of the second voltage dividing resistor The voltage value is the reference set value; If the protocol parameters of the equipment connected to each power supply port obtained by the protocol interface unit have a number of equipment connected to the power supply port, the required voltage of which is greater than the set voltage value, then determine whether the corresponding power supply port is connected The required voltage of the device is not within the power supply capability of the first-stage power converter, the control unit outputs a second signal to the regulated current source, so that the current value of the regulated current source changes, so that the The voltage drop across the first voltage dividing resistor becomes larger, the voltage value at the first end of the second voltage dividing resistor is lower than the reference set value, and the output of the first stage power conversion module increases the first power supply voltage The highest requested voltage to the device connected to each power supply port. 3. The multi-power supply port control circuit according to claim 2, characterized in that, when the protocol parameters of the equipment connected to each power supply port obtained by the protocol interface unit, there are requirements for the equipment connected to several power supply ports. When the voltage is greater than the set voltage value, according to the resistance value of the first voltage dividing resistor, the control unit outputs a second signal to the adjustable current source to convert the voltage value that needs to be increased into the corresponding Adjust the current value of the current source. 4. The multi-power supply port control circuit according to claim 3, wherein the current value of the adjustable current source is

Wherein, I is the current value of the regulating current source, R1 is the resistance value of the first voltage dividing resistor, and ΔV is the voltage value to be increased. 5. The multi-power supply port control circuit according to claim 2, wherein the first stage power conversion module includes an AC/DC converter and a feedback unit; The first terminal of the feedback unit is coupled to the first terminal of the second voltage dividing resistor, the second terminal thereof is coupled to the primary side of the AC/DC converter, and the third terminal thereof is coupled to the a secondary side of the AC/DC converter, the first end of the first voltage dividing resistor is coupled to the secondary side of the AC/DC converter; The feedback unit is used for adjusting the magnitude of the first power supply voltage output by the AC/DC converter according to the voltage value of the first terminal of the second voltage dividing resistor. 6. The multi-power supply port control circuit according to claim 5, wherein the feedback unit comprises a controllable precision voltage regulator, an optocoupler, a current limiting resistor and a main power control unit; the main power control unit The output terminal of the photocoupler is coupled to the primary side of the AC/DC converter; the first terminal of the photocoupler is coupled to the input terminal of the main power control unit, and its second terminal is coupled to the controllable The first end of the precision voltage regulator, the third end of which is coupled to the first end of the current limiting resistor, the fourth end of which is grounded, and the second end of the current limiting resistor is coupled to the AC/DC converter The secondary side of the device; the second terminal of the controllable precision voltage regulator is coupled to the first terminal of the second voltage dividing resistor, and the third terminal thereof is grounded. 7. The multi-power supply port control circuit according to claim 5, characterized in that, the second stage power conversion unit is a DC/DC converter. 8 . The multi-power supply port control circuit according to claim 7 , wherein the second-level power conversion unit corresponding to the device connected to the highest requested voltage is configured to output the highest requested voltage. 9. The multi-power supply port control circuit according to claim 1, further comprising a bypass capacitor; the first end of the bypass capacitor is coupled to the output end of the first-stage power conversion module, which The second end is grounded. 10. The multi-power supply port control circuit according to claim 1, wherein the power supply port comprises a USB TYPE-A interface or a USB TYPE-C interface. 11. An electronic device, comprising the multi-power supply port control circuit according to any one of claims 1-10. 12. A control method for main voltage conversion, characterized in that it is used to control the multi-power supply port control circuit according to any one of claims 1-10, the method comprising: Obtain the protocol parameters of the devices connected to each power supply port and send them to the control unit; According to the protocol parameters of the equipment connected to each power supply port, judge whether the voltage required by the equipment connected to each power supply port is within the power supply capability range of the first-stage power conversion module; and control the adjustment according to the judgment result the current value of the current source to adjust the voltage value at the first terminal of the second voltage dividing resistor; The magnitude of the first power supply voltage output by the first-stage power conversion module is adjusted according to the voltage value of the first terminal of the second voltage dividing resistor.

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