A power distribution circuit and distribution algorithm for multi-interface PD power supply

Abstract

The present invention relates to the technical field of power supply circuits, and provides a power distribution circuit and distribution algorithm for a multi-interface PD power supply. A first connection end of a detection feedback module is connected to a detection end of a power conversion module, and a second connection end is connected to a control end of the power distribution module, so as to adjust the detection end voltage of the power conversion module according to a target output voltage to realize output feedback control; a third connection end is connected to an output end of the power conversion module, so as to obtain an actual output voltage output by the power conversion module, and feed it back to the control end of the power distribution module through the third connection end, so as to drive the power distribution module to perform voltage output closed-loop control; the detection feedback module cooperates with the power distribution module to simultaneously take into account the load power supply on at least one interface output module, and supports multiple charging protocols, so that the efficiency of the secondary output of the high-frequency transformer to the load can theoretically reach up to 99%, and the output efficiency is significantly improved by utilizing efficient power distribution and management.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply circuits, and in particular to a power distribution circuit and a distribution algorithm for a multi-interface PD power supply. Background Art

[0002] With the continuous development of electronic industry technology, more and more electronic devices have entered people's daily lives. The problem that follows is that when carrying various electronic devices out, multiple chargers are required, which not only increases the burden of carrying, but also takes up a lot of space. Usually, each electronic device requires a corresponding charger, which forces people to carry multiple bulky chargers.

[0003] In order to reduce the size of the charger and meet the charging needs of multiple electronic devices at one time, multi-port PD power supplies came into being. Multi-port PD power supplies can charge multiple electronic devices such as mobile phones, computers, tablets, etc. at the same time, so they have been widely used in the field of terminal consumer electronics.

[0004] In order to achieve the goal of charging multiple electronic devices at one time, electronic engineers often adopt the solution of adding multiple output ports to the original single-output PD power supply. However, the existing multi-interface PD power supply technology usually uses a buck IC and a filter circuit on each output. Although the combined theoretical efficiency of the buck IC and the filter circuit can reach up to 96%, the AC-to-DC circuit efficiency before the PD power buck IC and the filter circuit can only reach a maximum of 92%, so the efficiency of the entire PD power supply can only reach a maximum of 88.32%. This design not only limits the further reduction of the PD power supply volume, but also limits the further improvement of efficiency and the further reduction of temperature. Summary of the invention

[0005] The present invention provides a power distribution circuit and distribution algorithm for a multi-interface PD power supply, which solves the technical problems of high cost, large volume and low efficiency of the existing multi-interface PD power supply circuit.

[0006] To solve the above technical problems, the present invention provides a power distribution circuit for a multi-interface PD power supply, comprising: a power conversion module, a power distribution module and a detection feedback module, and at least one interface output module;

[0007] The input end of the power conversion module is connected to the power input end, the output end is connected to the power distribution module, and the detection end is connected to the detection feedback module, and is used to convert the input power into a voltage and output a supply voltage;

[0008] The output end of the power distribution module is connected to the interface output module, and is used to determine the target output voltage according to the connected load, and feed it back to the power conversion module through the detection feedback module;

[0009] The detection feedback module has a first connection end connected to the detection end of the power conversion module and a second connection end connected to the control end of the power distribution module, and is used to adjust the detection end voltage of the power conversion module according to the target output voltage;

[0010] The power conversion module is used to perform pulse modulation to output a target output voltage according to the detection voltage of the detection end;

[0011] The third connection end of the detection feedback module is connected to the output end of the power conversion module, and is used to obtain the actual output voltage output by the power conversion module, and feed it back to the control end of the power distribution module through the third connection end, so as to drive the power distribution module to perform voltage output closed-loop control;

[0012] The power distribution module is also used to compare the actual output voltage with the target output voltage, determine whether to re-modulate, and if not, distribute the output voltage to the corresponding interface output module;

[0013] The output end of the interface output module is connected to the load and is used to distribute power to the load.

[0014] In this basic solution, the first connection end of the detection feedback module is connected to the detection end of the power conversion module, and the second connection end is connected to the control end of the power distribution module, so as to adjust the detection end voltage of the power conversion module according to the target output voltage to realize output feedback control; the third connection end of the detection feedback module is connected to the output end of the power conversion module to obtain the actual output voltage of the power conversion module, and feed it back to the control end of the power distribution module through the third connection end, so as to drive the power distribution module to perform voltage output closed-loop control; the detection feedback module cooperates with the power distribution module to simultaneously take into account the load power supply on at least one interface output module, and supports multiple charging protocols, so that the efficiency of the secondary output of the high-frequency transformer to the load can theoretically reach up to 99%, and the output efficiency is significantly improved by utilizing efficient power distribution and management.

[0015] In a further embodiment, the detection feedback module includes a drive control module and a drive detection module:

[0016] The input end of the drive control module is connected to the output end of the power conversion module, the output end is connected to the control end of the power distribution module as a second connection end, and its controlled end is connected to the drive detection module, and is used to adjust the detection end voltage of the power conversion module according to the target output voltage under the control of the drive detection module;

[0017] The acquisition end of the drive detection module is connected to the output end of the power conversion module as the first connection end, and its inner loop leads out to a third connection end connected to the power distribution module, and the intersection of the third connection end and its inner loop is connected to the controlled end as the drive end; the drive detection module obtains the actual output voltage of the power conversion module through the acquisition end and feeds it back to the control end of the power distribution module through the third connection end, and the power distribution module is also used to change the output of its drive end through the third connection end input, thereby driving the drive control module to adjust the detection end voltage of the power conversion module according to the target output voltage.

[0018] When performing output voltage detection, this solution only collects voltage from the third connection terminal of the drive detection module; when feedback control is required, the power distribution module applies a drive voltage to the drive detection module based on the drive detection module, so that the drive detection module is turned on under the control of the drive end to perform feedback control. The circuit has high circuit utilization and low power consumption, and can effectively improve the output efficiency of the circuit.

[0019] In a further embodiment, the drive control module includes an optical coupler and a controllable voltage regulator;

[0020] The optical coupler includes a light output end and a light receiving end having optical coordination;

[0021] Pin 1 of the optical output terminal is connected to the output terminal of the power conversion module, and pin 2 is connected to the cathode of the controllable voltage-stabilizing source; the anode of the controllable voltage-stabilizing source is grounded, and the reference electrode is connected to the driving terminal of the driving detection module as the controlled terminal;

[0022] Pin 4 of the optical receiving end is connected to the control end of the power distribution module as a second connection end, and pin 3 is grounded;

[0023] The controllable voltage-stabilizing source is used to turn on the optical output end and drive the optical coupler to start when the voltage at the driving end exceeds the reference voltage, and to perform voltage feedback control on the power conversion module to perform pulse modulation.

[0024] This solution is based on the conduction characteristics of a controllable voltage regulator. By changing the voltage of its reference electrode, the conduction control of the optocoupler is achieved. It has fast conversion speed, low power consumption, and can greatly improve the efficiency of the power supply. It also uses optocoupler isolation feedback, which has high isolation withstand voltage, strong anti-interference ability, wide transmission signal range, and good circuit stability.

[0025] In a further embodiment, the driving detection module includes a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the output end of the power conversion module as a first connection end, and the other end is grounded through the second voltage-dividing resistor;

[0026] The other end of the first voltage-dividing resistor is also connected to the controlled end of the drive control module as a driving end, and is used to output a driving signal to control the drive control module to perform voltage output closed-loop control;

[0027] The other end of the first voltage-dividing resistor is connected to the control end of the power distribution module as a third connection end, and is used to receive the voltage input of the power distribution module to adjust the voltage across the second voltage-dividing resistor, thereby performing voltage output closed-loop control; or, collect the actual output voltage of the power conversion module, and feed it back to the control end of the power distribution module through the third connection end to determine whether it is the same as the target output voltage. If so, the corresponding interface output module is turned on according to preset rules to supply power to the corresponding load.

[0028] This solution sets up two resistors that are simply connected in series. On the one hand, it cooperates with the power conversion module to perform real-time detection of the output voltage, with low detection cost and high efficiency; on the other hand, the node between the first voltage-dividing resistor and the second voltage-dividing resistor is connected to the controlled end of the drive control module, and the voltage across the second voltage-dividing resistor is adjusted in cooperation with the output of the power conversion module, thereby realizing the conduction control of the drive control module, so that it enters the closed-loop control of the output feedback, and has a compact structure and is conducive to miniaturization design.

[0029] In a further embodiment, the power distribution module includes a PD chip having built-in multiple outputs connected one-to-one with the interface output modules;

[0030] The PD chip is also provided with a communication pin, which is connected to the output end of the interface output module, and is used to obtain the charging demand of at least one connected load, determine at least one target output voltage and feed it back to the power conversion module in sequence;

[0031] When the control end of the PD chip detects the actual output voltage, it compares the actual output voltage with the corresponding target output voltage to see if they are consistent. If so, it controls the corresponding interface output module to be turned on and output according to the target output voltage.

[0032] The PD chip of this solution performs the timing distribution for each power consumption based on preset rules, removes the buck IC used for each output, simplifies the filter circuit, thus significantly reducing the overall cost and significantly improving the circuit efficiency (theoretically up to 99%). In addition, due to the reduction in the number and complexity of components, the overall size of the charger can be further reduced.

[0033] In a further embodiment, the interface output module includes a first switch tube and a first capacitor, the first switch tube is connected in series between the load input end and the output end of the power distribution module, one end of the first capacitor is connected between the first switch tube and the load, and the other end is grounded;

[0034] The first end of the first switch is connected to the load as an output end, the second end is connected to the output end of the power distribution module, and the third end is connected to the power distribution module;

[0035] When the load is connected to the first end of the first switch, the power distribution module obtains the charging demand of the connected load through the communication pin; when the power distribution module determines that the output voltage is normal, it drives the first switch to turn on, and then turns on the power supply circuit to supply power to the corresponding load.

[0036] This solution cooperates with the unified management of the PD chip, simplifies the output interface module corresponding to each load, only uses the first switch tube to control the conduction of the power supply circuit, and sets the first capacitor for filtering the output, which can further reduce costs and reduce the size of the PD power supply.

[0037] In a further embodiment, the power conversion module includes a control module and a conversion module, the input end of the control module is connected to the first connection end of the detection feedback module, and the output end is connected to the conversion module; the input end of the conversion module is connected to the power input end, and the output end is connected to the input end of the power distribution module and the second connection end of the detection feedback module;

[0038] The control module includes a control IC, a primary side control circuit and a second switch tube connected in sequence, the detection end of the control IC is connected to the detection feedback module; the first end of the second switch tube is grounded, the second end is connected to the conversion module, and the third end is connected to the output end of the primary side control circuit.

[0039] In a further embodiment, the conversion module includes a transformer, a first diode and a second capacitor, and the transformer includes a primary winding and a secondary winding; one end of the primary winding is connected to the power input end, and the other end is connected to the second switch tube; the output end of the secondary winding is connected to the positive electrode of the first diode; the negative electrode of the first diode is connected to the third connection end, the input end of the power distribution module, and one end of the second capacitor; the other end of the second capacitor is grounded.

[0040] This solution adjusts the duty cycle and frequency of the primary winding of the transformer through the control IC, primary-side control circuit and second switch tube connected in sequence to complete the switching of the output power. The PD chip performs output control distribution, and the output is stable and controllable.

[0041] The present invention also provides a power allocation algorithm for a multi-interface PD power supply, which is applied to the above-mentioned power allocation circuit for a multi-interface PD power supply, including:

[0042] Obtaining power usage information of at least one load connected to the load;

[0043] Based on at least one of the load power usage information, correspondingly generate at least one target output voltage;

[0044] Integrate all the target output voltages according to a preset rule to obtain an output list;

[0045] Reading each target output voltage on the output list in sequence and performing pulse modulation;

[0046] Get the real-time output voltage and determine whether it is consistent with the corresponding target output voltage. If so, proceed to the next step. If not, re-execute pulse modulation.

[0047] Turn on the output interface of the corresponding load to supply power to the load.

[0048] Based on the multi-channel output requirements, this basic solution configures a corresponding power distribution algorithm for the power distribution circuit, generates at least one target output voltage based on at least one load power consumption information, integrates all target output voltages according to preset rules to obtain an output list, reads each target output voltage on the output list in sequence, and performs pulse modulation, so that only one power conversion module is used to take into account the power consumption requirements of multiple loads at the same time, so that the efficiency of the secondary output of the high-frequency transformer to the load can theoretically reach up to 99%, bringing significant energy consumption reduction and heat reduction, thereby further improving the reliability and life of the power supply. Due to the reduction in energy loss, the heat dissipation demand is also reduced accordingly, further adapting to the compact miniaturization design.

[0049] In a further embodiment, the preset rules include:

[0050] From the load power consumption information, the access time of each load is obtained, and all the target output voltages are integrated according to the order of access time to obtain an output list;

[0051] Alternatively, the remaining power of each load is obtained from the load power usage information, and all the target output voltages are integrated according to the value of the remaining power to obtain an output list.

[0052] This solution sets a variety of preset rules based on different electricity distribution requirements to adapt to the multi-load electricity requirements of different users. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1It is a framework diagram of a power distribution circuit system for a multi-interface PD power supply provided by an embodiment of the present invention;

[0054] Figure 2 It is a working principle diagram of a power distribution circuit for a multi-interface PD power supply provided by an embodiment of the present invention;

[0055] Figure 3 The embodiment of the present invention provides Figure 1 Hardware circuit diagram;

[0056] Wherein: power conversion module 1, control module 11, conversion module 12; power distribution module 2, detection feedback module 3, drive control module 31, drive detection module 32; interface output module 4;

[0057] Transformer T1, first diode D1; optocoupler U1, controllable voltage regulator D2, first voltage-dividing resistor R1, second voltage-dividing resistor R2, PD chip U2, first switch tubes Q11, Q12, second switch tube Q2, first capacitors C11, C12, second capacitor C2; control ICU3, primary side control circuit U4. DETAILED DESCRIPTION

[0058] The following specifically illustrates the implementation mode of the present invention in conjunction with the accompanying drawings. The embodiments are provided for illustrative purposes only and are not to be construed as limitations of the present invention. The accompanying drawings are provided for reference and illustration only and do not constitute limitations on the scope of patent protection of the present invention, because many changes may be made to the present invention without departing from the spirit and scope of the present invention.

[0059] Example 1

[0060] An embodiment of the present invention provides a power distribution circuit for a multi-interface PD power supply, such as Figure 1 , Figure 2 , Figure 3 As shown, in this embodiment, it includes: a power conversion module 1, a power distribution module 2 and a detection feedback module 3, and at least one interface output module 4;

[0061] The input end of the power conversion module 1 is connected to the power input end, the output end is connected to the power distribution module 2, and the detection end is connected to the detection feedback module 3, and is used to convert the input power into a voltage and output a supply voltage;

[0062] The output end of the power distribution module 2 is connected to the interface output module 4, and is used to determine the target output voltage according to the connected load, and feed it back to the power conversion module 1 through the detection feedback module 3;

[0063] The detection feedback module 3 has a first connection end connected to the detection end of the power conversion module 1 and a second connection end connected to the control end of the power distribution module 2, and is used to adjust the detection end voltage of the power conversion module 1 according to the target output voltage;

[0064] The power conversion module 1 is used to perform pulse modulation to output a target output voltage according to the detection voltage of the detection end;

[0065] The third connection end of the detection feedback module 3 is connected to the output end of the power conversion module 1, and is used to obtain the actual output voltage output by the power conversion module 1, and feed it back to the control end of the power distribution module 2 through the third connection end, so as to drive the power distribution module 2 to perform voltage output closed-loop control;

[0066] The power distribution module 2 is also used to compare the actual output voltage with the target output voltage, determine whether to re-modulate, and if not, distribute the output voltage to the corresponding interface output module 4;

[0067] The output end of the interface output module 4 is connected to the load for distributing power to the load.

[0068] In this embodiment, the detection feedback module 3 includes a drive control module 31 and a drive detection module 32:

[0069] The input end of the drive control module 31 is connected to the output end of the power conversion module 1, and the output end is connected to the control end of the power distribution module 2 as the second connection end, and its controlled end is connected to the drive detection module 32, and is used to adjust the detection end voltage of the power conversion module 1 according to the target output voltage under the control of the drive detection module 32;

[0070] The acquisition end of the drive detection module 32 is connected to the output end of the power conversion module 1 as the first connection end, and its inner loop leads out to the third connection end connected to the power distribution module 2, and the intersection of the third connection end and its inner loop is connected to the controlled end as the driving end; the drive detection module 32 obtains the actual output voltage output by the power conversion module 1 through the acquisition end and feeds it back to the control end of the power distribution module 2 through the third connection end, and the power distribution module 2 is also used to change the output of its driving end through the third connection end input, thereby driving the drive control module 31 to adjust the detection end voltage of the power conversion module 1 according to the target output voltage.

[0071] When the output voltage is detected in this embodiment, the voltage is only collected from the third connection terminal of the driving detection module 32; when feedback control is needed, the power distribution module 2 applies a driving voltage to the driving detection module 32 based on the driving detection module 32, so that the driving detection module 32 is turned on under the control of the driving end to perform feedback control, which has high circuit utilization and low power consumption, and can effectively improve the output efficiency of the circuit.

[0072] In this embodiment, the drive control module 31 includes an optical coupler U1 and a controllable voltage source D2;

[0073] The optical coupler U1 includes an optical output end and an optical receiving end having optical coordination;

[0074] Pin 1 of the optical output terminal is connected to the output terminal of the power conversion module 1, and pin 2 is connected to the cathode of the controllable voltage regulator D2; the anode of the controllable voltage regulator D2 is grounded, and the reference electrode is connected to the driving terminal of the driving detection module 32 as the controlled terminal;

[0075] Pin 4 of the optical receiving end is connected to the control end of the power distribution module 2 as the second connection end, and pin 3 is grounded;

[0076] The controllable voltage regulator D2 is used to turn on the optical output end when the voltage at the driving end exceeds the reference voltage, drive the optical coupler U1 to start, and perform voltage feedback control on the power conversion module 1 to perform pulse modulation.

[0077] This embodiment is based on the conduction characteristics of the controllable voltage-stabilizing source D2, and realizes the conduction control of the optocoupler U1 by changing the voltage of its reference electrode. The conversion speed is fast, the power consumption is small, and the efficiency of the power supply can be greatly improved. In addition, the optocoupler U1 is used for isolated feedback, which has high isolation withstand voltage, strong anti-interference ability, wide transmission signal range, and good circuit stability.

[0078] In this embodiment, the driving detection module 32 includes a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2, one end of the first voltage-dividing resistor R1 is connected to the output end of the power conversion module 1 as a first connection end, and the other end is grounded through the second voltage-dividing resistor R2;

[0079] The other end of the first voltage-dividing resistor R1 is also connected to the controlled end of the driving control module 31 as a driving end, and is used to output a driving signal to control the driving control module 31 to perform voltage output closed-loop control;

[0080] The other end of the first voltage-dividing resistor R1 is connected to the control end of the power distribution module 2 as the third connection end, and is used to receive the voltage input of the power distribution module 2 to adjust the voltage across the second voltage-dividing resistor R2, and then perform voltage output closed-loop control; or, collect the actual output voltage of the power conversion module 1, and feed it back to the control end of the power distribution module 2 through the third connection end to determine whether it is the same as the target output voltage. If so, the corresponding interface output module 4 is turned on according to the preset rules to supply power to the corresponding load.

[0081] In this embodiment, two resistors are simply connected in series. On the one hand, they cooperate with the power conversion module 1 to perform real-time detection of the output voltage, with low detection cost and high efficiency. On the other hand, the node between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is connected to the controlled end of the drive control module 31, and the voltage across the second voltage-dividing resistor R2 is adjusted in cooperation with the output of the power conversion module 1, thereby realizing the conduction control of the drive control module 31, so that it enters the closed-loop control of the output feedback, and has a compact structure, which is conducive to miniaturization design.

[0082] In this embodiment, the power distribution module 2 includes a PD chip U2, and the PD chip U2 has built-in multiple outputs connected one-to-one with the interface output modules 4;

[0083] The PD chip U2 is also provided with a communication pin, which is connected to the output end of the interface output module 4, and is used to obtain the charging demand of at least one connected load, determine at least one target output voltage and feed it back to the power conversion module 1 in sequence;

[0084] When the control end of the PD chip U2 detects the actual output voltage, it compares the actual output voltage with the corresponding target output voltage to see if they are consistent. If so, it controls the corresponding interface output module 4 to turn on and output according to the target output voltage.

[0085] The PD chip U2 of this embodiment performs the timing distribution for each power consumption based on the preset rules, removes the buck IC used for each output, simplifies the filter circuit, thus significantly reducing the overall cost and significantly improving the circuit efficiency (theoretically up to 99%). In addition, due to the reduction in the number and complexity of components, the overall size of the charger can be further reduced.

[0086] In this embodiment, the interface output module 4 includes a first switch tube and a first capacitor. The first switch tube is connected in series between the load input terminal and the output terminal of the power distribution module 2. One end of the first capacitor is connected between the first switch tube and the load, and the other end is grounded.

[0087] The first end of the first switch is connected to the load as an output end, the second end is connected to the output end of the power distribution module 2, and the third end is connected to the power distribution module 2;

[0088] When the load is connected to the first end of the first switch, the power distribution module 2 obtains the charging demand of the connected load through the communication pin; when the power distribution module 2 determines that the output voltage is normal, it drives the first switch to turn on, and then turns on the power supply circuit to supply power to the corresponding load.

[0089] This embodiment cooperates with the unified management of the PD chip U2, simplifies the output interface module corresponding to each load, only uses the first switch tube to control the conduction of the power supply circuit, and sets the first capacitor for filtering the output, which can further reduce costs and reduce the size of the PD power supply.

[0090] The first switch tube can be an N-channel MOS tube or a P-channel MOS tube according to requirements.

[0091] In this embodiment, the power conversion module 1 includes a control module 11 and a conversion module 12, the input end of the control module 11 is connected to the first connection end of the detection feedback module 3, and the output end is connected to the conversion module 12; the input end of the conversion module 12 is connected to the power input end, and the output end is connected to the input end of the power distribution module 2 and the second connection end of the detection feedback module 3;

[0092] The control module 11 includes a control ICU3, a primary side control circuit U4 and a second switch tube Q2 connected in sequence, and the detection end of the control ICU3 is connected to the detection feedback module 3; the first end of the second switch tube Q2 is grounded, the second end is connected to the conversion module 12, and the third end is connected to the output end of the primary side control circuit U4.

[0093] The primary side control circuit U4 is a conventional control circuit in the art and will not be described in detail in this embodiment.

[0094] In this embodiment, the conversion module 12 includes a transformer T1 (high-frequency transformer T1), a first diode D1, and a second capacitor C2. The transformer T1 includes a primary winding and a secondary winding; one end of the primary winding is connected to the power input end, and the other end is connected to the second switch tube Q2; the output end of the secondary winding is connected to the positive electrode of the first diode D1; the negative electrode of the first diode D1 is connected to the third connection end, the input end of the power distribution module 2, and one end of the second capacitor C2; the other end of the second capacitor C2 is grounded.

[0095] The first diode D1 and the second capacitor C2 form a rectification and filtering mechanism to process the output voltage.

[0096] In this embodiment, the duty cycle and frequency of the primary winding of the transformer T1 are adjusted by sequentially connected control ICU3, primary side control circuit U4 and second switch tube Q2 to complete the switching of output power. The output control distribution is performed by the PD chip U2, and the output is stable and controllable.

[0097] In this embodiment, taking the charging order as priority according to the access time (i.e., the preset rule) and the first switch tube selecting the N-channel MOS tube as an example, the specific power supply process is as follows:

[0098] First, only one load is connected, and the first switch tube in the corresponding interface output module 4 is Q2.

[0099] The PD chip U2 obtains the charging demand (i.e., load power consumption information) of the connected load through the communication line (i.e., communication pin) and obtains the target output voltage (voltage value) from it. At this time, the PD chip U2 collects the voltage from the control end to determine whether the real-time output voltage is consistent with the target output voltage. If so, it outputs a high level to the gate (third terminal) of the first switch tube, and the first switch tube is turned on to supply power to load 1, while keeping the other outputs in the off state.

[0100] If not, current is output through the control terminal to adjust the resistance voltage on the second voltage-dividing resistor R2.

[0101] When the resistance voltage on the second voltage-dividing resistor R2 exceeds the reference voltage, the controllable voltage regulator D2 is turned on, the optocoupler U1 is turned on, and the control ICU3 performs pulse width modulation (duty cycle and frequency) to output the corresponding PWM wave after receiving the feedback signal of the optocoupler U1, thereby controlling the second switch tube Q2 to be turned on / off to adjust the output power of the transformer T1.

[0102] The comparison and judgment is performed again, and the PD chip U2 collects the voltage from the control end to determine whether the real-time output voltage is consistent with the target output voltage.

[0103] Second, at least two loads are connected, and the corresponding first switch tubes in the interface output module 4 are Q11 and Q12 respectively.

[0104] The PD chip U2 obtains the charging requirements of multiple connected loads (i.e., load power consumption information) through the communication line, obtains the corresponding target output voltage (voltage value), obtains the connection time of each load, and integrates all target output voltages according to the order of connection time to obtain an output list.

[0105] Read each target output voltage in the output list in sequence. If load 1 is connected first and load 2 is connected later, then:

[0106] Since the operating frequency of the primary side control ICU3 is 300kHz, and the operating frequency of the PD chip U2 is between 100kHz and 150kHz.

[0107] (1) In the first working cycle of the PD chip U2, the target output voltage A corresponding to the load 1 is first obtained, and the real-time output voltage is collected from the control end to determine whether it is consistent with the target output voltage A. If so, a high level is output to the gate (third end) of the first switch tube Q11, and the first switch tube Q11 is turned on to supply power to the load 1, and the first switch tube Q12 is kept in the off state.

[0108] If not, current is output through the control terminal to adjust the resistance voltage on the second voltage-dividing resistor R2.

[0109] When the resistance voltage on the second voltage-dividing resistor R2 exceeds the reference voltage, the controllable voltage regulator D2 is turned on, the optocoupler U1 is turned on, and the control ICU3 performs pulse width modulation (duty cycle and frequency) to output the corresponding PWM wave after receiving the feedback signal A from the optocoupler U1, thereby controlling the second switch tube Q2 to be turned on / off to adjust the output power of the transformer T1.

[0110] The comparison and judgment is performed again, and the PD chip U2 collects the voltage from the control end to determine whether the real-time output voltage is consistent with the target output voltage A.

[0111] (2) In the second working cycle of the PD chip U2, the target output voltage B corresponding to the load 2 is obtained, and the real-time output voltage is collected from the control end to determine whether it is consistent with the target output voltage B. If so, a high level is output to the gate (third end) of the first switch tube Q12, and the first switch tube Q12 is turned on to supply power to the load 2, while keeping the first switch tube Q11 in the off state.

[0112] If not, current is output through the control terminal to adjust the resistance voltage on the second voltage-dividing resistor R2.

[0113] When the resistance voltage on the second voltage-dividing resistor R2 exceeds the reference voltage, the controllable voltage regulator D2 is turned on, the optocoupler U1 is turned on, and the control ICU3 performs pulse width modulation (duty cycle and frequency) to output the corresponding PWM wave after receiving the feedback signal B from the optocoupler U1, thereby controlling the second switch tube Q2 to be turned on / off to adjust the output power of the transformer T1.

[0114] The comparison and judgment is performed again, and the PD chip U2 collects the voltage from the control end to determine whether the real-time output voltage is consistent with the target output voltage B.

[0115] In this way, the two working cycles of the PD chip U2 cycle back and forth, and power is distributed to load one and load two in a timely manner.

[0116] In this embodiment, taking the two-way interface output module 4 as an example, a conventional single-interface power adapter compatible with multiple charging protocols is only applicable to a single output port. If this solution is to be used in multi-port output, an additional secondary chip U2 and corresponding IC peripheral circuits including resistors, resistors, and MOS tubes will be added for each additional output. The cost of this embodiment is about 20% lower than that of the prior art in two-way output. By analogy, the cost of this embodiment is greatly reduced.

[0117] In the embodiment of the present invention, a first connection end of the detection feedback module 3 is connected to the detection end of the power conversion module 1, and a second connection end is connected to the control end of the power distribution module 2, so as to adjust the detection end voltage of the power conversion module 1 according to the target output voltage to realize output feedback control; a third connection end of the detection feedback module 3 is connected to the output end of the power conversion module 1, so as to obtain the actual output voltage output by the power conversion module 1, and feed it back to the control end of the power distribution module 2 through the third connection end, so as to drive the power distribution module 2 to perform voltage output closed-loop control; the detection feedback module 3 cooperates with the power distribution module 2 to simultaneously take into account the load power supply on at least one interface output module 4, and supports multiple charging protocols, so that the efficiency of the secondary output of the high-frequency transformer T1 to the load can theoretically reach up to 99%, and the output efficiency is significantly improved by utilizing efficient power distribution and management.

[0118] Example 2

[0119] The embodiment of the present invention further provides a power allocation algorithm for a multi-interface PD power supply, which is applied to a power allocation circuit for a multi-interface PD power supply provided in the above embodiment 1, including:

[0120] Obtaining power usage information of at least one load connected to the load;

[0121] Based on at least one load power usage information, generate at least one target output voltage accordingly;

[0122] Integrate all target output voltages according to preset rules to obtain an output list;

[0123] Read each target output voltage on the output list in sequence and perform pulse modulation;

[0124] Get the real-time output voltage and determine whether it is consistent with the corresponding target output voltage. If so, proceed to the next step. If not, re-execute pulse modulation.

[0125] The output interface of the corresponding load is turned on to supply power to the load.

[0126] The embodiment of the present invention configures a corresponding power distribution algorithm for the power distribution circuit based on the multi-channel output requirements, generates at least one target output voltage based on the power consumption information of at least one load, integrates all target output voltages according to preset rules to obtain an output list, reads each target output voltage on the output list in sequence, and performs pulse modulation, so that only one power conversion module 1 is used to take into account the power consumption requirements of multiple loads at the same time, so that the efficiency of the secondary output of the high-frequency transformer T1 to the load can theoretically reach up to 99%, resulting in significant energy consumption reduction and heat reduction, thereby further improving the reliability and life of the power supply. Due to the reduction in energy loss, the heat dissipation demand is also reduced accordingly, further adapting to the compact miniaturization design.

[0127] In this embodiment, the preset rules include but are not limited to the following two methods:

[0128] From the load power consumption information, the access time of each load is obtained, and all target output voltages are integrated according to the order of access time to obtain an output list;

[0129] Alternatively, the remaining power of each load is obtained from the load power usage information, and all target output voltages are integrated according to the value of the remaining power to obtain an output list.

[0130] This embodiment sets a variety of preset rules based on different power distribution requirements to adapt to the multi-load power requirements of different users.

[0131] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A power distribution circuit for a multi-interface PD power supply, characterized in that: include: A power conversion module, a power distribution module and a detection feedback module, and at least one interface output module; The input end of the power conversion module is connected to the power input end, the output end is connected to the power distribution module, and the detection end is connected to the detection feedback module, and is used to convert the input power into a voltage and output a supply voltage; The output end of the power distribution module is connected to the interface output module, and is used to determine the target output voltage according to the connected load, and feed it back to the power conversion module through the detection feedback module; The detection feedback module has a first connection end connected to the detection end of the power conversion module and a second connection end connected to the control end of the power distribution module, and is used to adjust the detection end voltage of the power conversion module according to the target output voltage; The power conversion module is used to perform pulse modulation to output a target output voltage according to the detection voltage of the detection end; The third connection end of the detection feedback module is connected to the output end of the power conversion module, and is used to obtain the actual output voltage output by the power conversion module, and feed it back to the control end of the power distribution module through the third connection end, so as to drive the power distribution module to perform voltage output closed-loop control; The power distribution module is also used to compare the actual output voltage with the target output voltage, determine whether to re-modulate, and if not, distribute the output voltage to the corresponding interface output module; The output end of the interface output module is connected to the load, and is used to distribute power to the load; The detection feedback module includes a drive control module and a drive detection module: The input end of the drive control module is connected to the output end of the power conversion module, the output end is connected to the control end of the power distribution module as a second connection end, and its controlled end is connected to the drive detection module, and is used to adjust the detection end voltage of the power conversion module according to the target output voltage under the control of the drive detection module; The acquisition end of the drive detection module is connected to the output end of the power conversion module as the first connection end, and its inner loop leads out to a third connection end connected to the power distribution module, and the intersection of the third connection end and its inner loop is connected to the controlled end as the drive end; the drive detection module obtains the actual output voltage of the power conversion module through the acquisition end and feeds it back to the control end of the power distribution module through the third connection end, and the power distribution module is also used to change the output of its drive end through the third connection end input, thereby driving the drive control module to adjust the detection end voltage of the power conversion module according to the target output voltage.

2. A power distribution circuit for a multi-interface PD power supply as claimed in claim 1, characterized in that: The drive control module includes an optical coupler and a controllable voltage stabilization source; The optical coupler includes a light output end and a light receiving end having optical coordination; Pin 1 of the optical output terminal is connected to the output terminal of the power conversion module, and pin 2 is connected to the cathode of the controllable voltage-stabilizing source; the anode of the controllable voltage-stabilizing source is grounded, and the reference electrode is connected to the driving terminal of the driving detection module as the controlled terminal; Pin 4 of the optical receiving end is connected to the control end of the power distribution module as a second connection end, and pin 3 is grounded; The controllable voltage-stabilizing source is used to turn on the optical output end and drive the optical coupler to start when the voltage at the driving end exceeds the reference voltage, and to perform voltage feedback control on the power conversion module to perform pulse modulation.

3. A power distribution circuit for a multi-interface PD power supply as claimed in claim 1, characterized in that: The driving detection module comprises a first voltage-dividing resistor and a second voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the output end of the power conversion module as a first connecting end, and the other end is grounded through the second voltage-dividing resistor; The other end of the first voltage-dividing resistor is also connected to the controlled end of the drive control module as a driving end, and is used to output a driving signal to control the drive control module to perform voltage output closed-loop control; The other end of the first voltage-dividing resistor is connected to the control end of the power distribution module as a third connection end, and is used to receive the voltage input of the power distribution module to adjust the voltage across the second voltage-dividing resistor, thereby performing voltage output closed-loop control; or, collect the actual output voltage of the power conversion module, and feed it back to the control end of the power distribution module through the third connection end to determine whether it is the same as the target output voltage. If so, the corresponding interface output module is turned on according to preset rules to supply power to the corresponding load.

4. A power distribution circuit for a multi-interface PD power supply as claimed in claim 3, characterized in that: The power distribution module includes a PD chip, and the PD chip has built-in multiple outputs connected one-to-one with the interface output modules; The PD chip is also provided with a communication pin, which is connected to the output end of the interface output module, and is used to obtain the charging demand of at least one connected load, determine at least one target output voltage and feed it back to the power conversion module in sequence; When the control end of the PD chip detects the actual output voltage, it compares the actual output voltage with the corresponding target output voltage to see if they are consistent. If so, it controls the corresponding interface output module to be turned on and output according to the target output voltage.

5. A power distribution circuit for a multi-interface PD power supply as claimed in claim 4, characterized in that: The interface output module includes a first switch tube and a first capacitor, wherein the first switch tube is connected in series between the load input terminal and the output terminal of the power distribution module, one end of the first capacitor is connected between the first switch tube and the load, and the other end is grounded; The first end of the first switch is connected to the load as an output end, the second end is connected to the output end of the power distribution module, and the third end is connected to the power distribution module; When the load is connected to the first end of the first switch, the power distribution module obtains the charging demand of the connected load through the communication pin; when the power distribution module determines that the output voltage is normal, it drives the first switch to turn on, and then turns on the power supply circuit to supply power to the corresponding load.

6. A power distribution circuit for a multi-interface PD power supply as claimed in claim 1, characterized in that: The power conversion module includes a control module and a conversion module, the input end of the control module is connected to the first connection end of the detection feedback module, and the output end is connected to the conversion module; the input end of the conversion module is connected to the power input end, and the output end is connected to the input end of the power distribution module and the second connection end of the detection feedback module; The control module includes a control IC, a primary side control circuit and a second switch tube connected in sequence, the detection end of the control IC is connected to the detection feedback module; the first end of the second switch tube is grounded, the second end is connected to the conversion module, and the third end is connected to the output end of the primary side control circuit.

7. A power distribution circuit for a multi-interface PD power supply as claimed in claim 6, characterized in that: The conversion module includes a transformer, a first diode and a second capacitor, and the transformer includes a primary winding and a secondary winding; one end of the primary winding is connected to the power input end, and the other end is connected to the second switch tube; the output end of the secondary winding is connected to the positive electrode of the first diode; the negative electrode of the first diode is connected to the third connection end, the input end of the power distribution module, and one end of the second capacitor; the other end of the second capacitor is grounded.

8. A power distribution algorithm for a multi-interface PD power supply, applied to a power distribution circuit for a multi-interface PD power supply according to any one of claims 1 to 7, characterized in that: include: Obtaining power usage information of at least one load connected to the load; Based on at least one of the load power usage information, correspondingly generate at least one target output voltage; Integrate all the target output voltages according to a preset rule to obtain an output list; Reading each target output voltage on the output list in sequence and performing pulse modulation; Get the real-time output voltage and determine whether it is consistent with the corresponding target output voltage. If so, proceed to the next step. If not, re-execute pulse modulation. Turn on the output interface of the corresponding load to supply power to the load.

9. A power allocation algorithm for a multi-interface PD power supply as claimed in claim 8, characterized in that: The preset rules include: From the load power consumption information, the access time of each load is obtained, and all the target output voltages are integrated according to the order of access time to obtain an output list; Alternatively, the remaining power of each load is obtained from the load power usage information, and all the target output voltages are integrated according to the value of the remaining power to obtain an output list.

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