Monitoring circuit of power supply circuit and charger

Abstract

A monitoring circuit of a power supply circuit and a charger, the power supply circuit is provided with a plurality of output ports, the monitoring circuit comprises an acquisition gating unit, the input end of the acquisition gating unit can be connected with the plurality of output ports, and the acquisition gating unit is used for respectively acquiring a voltage signal and / or a current signal of each output port in a time-sharing manner; and the signal processing control unit is used for processing the acquired voltage signal and / or current signal of each output port to obtain an actual voltage corresponding to each voltage signal and / or an actual current corresponding to each current signal. According to the application, the voltage signal and / or the current signal of each output port can be respectively acquired in a time-sharing manner through the acquisition gating unit, so that the voltage information and / or the current information of each output port can be monitored without independently arranging a plurality of current and voltage acquisition circuits, and intelligent control of each output port is realized; and the size of a product for monitoring the current can be effectively reduced, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and more specifically to a monitoring circuit and a charger for a power supply circuit. Background Art

[0002] At present, there are more and more electronic devices, such as mobile phones, tablets, headphones, smart watches, laptops, etc. In the era of increasing integration, one charging device simultaneously charging multiple electronic devices has become an urgent problem to be solved. Highly integrated smart charging devices control 4 / 6 or even more Type C / USB outputs at the same time, which requires monitoring the voltage and current information of each output port and performing intelligent control of each output port.

[0003] In the existing technical solutions, basically each voltage and current output signal is processed by an independent current and voltage acquisition circuit and handed over to the MCU (Microcontroller Unit) for processing. For example: N output ports generate N voltage sampling circuits and N current sampling amplifier circuits, and the MCU needs to have 2N ADC (Analog to Digital Converter) sampling input ports. Under the premise of higher and higher integration and the pursuit of extreme product size, the huge number of sampling circuits makes the PCBA (Printed Circuit Board Assembly) volume unable to be compressed, and also requires an MCU with more peripheral interfaces to meet functional requirements; it not only increases the product volume, but also causes an increase in product costs. Utility Model Content

[0004] The present application is proposed to solve at least one of the above problems. According to one aspect of the present application, a monitoring circuit for a power supply circuit is provided, the power supply circuit having multiple output ports, the monitoring circuit comprising: an acquisition gating unit, the input end of the acquisition gating unit can be connected to the multiple output ports, the acquisition gating unit is used to acquire the voltage signal and / or current signal of each of the output ports in a time-sharing manner; a signal processing control unit, used to process the acquired voltage signal and / or current signal of each of the output ports to obtain an actual voltage corresponding to each voltage signal and / or an actual current corresponding to each current signal.

[0005] In one embodiment of the present application, the acquisition gating unit includes: a voltage acquisition gating subunit, the input end of the voltage acquisition gating subunit can be connected to at least one of the multiple output ports, and the voltage acquisition gating subunit is used to obtain the voltage signal of each of the output ports connected thereto in a time-sharing manner; a current acquisition gating subunit, the input end of the current acquisition gating subunit can be connected to at least one of the multiple output ports, and the current acquisition gating subunit is used to obtain the current signal of each of the output ports connected thereto in a time-sharing manner.

[0006] In one embodiment of the present application, the voltage acquisition gating subunit includes a plurality of voltage sampling circuits and a plurality of switches that are integrated together, each of the voltage sampling circuits is connected to one of the output ports, each of the voltage sampling circuits is provided with one of the switches, and the plurality of switches are connected to the signal processing control unit, and the signal processing control unit is also used to control the closure of the switches on each of the voltage sampling circuits in a time-sharing manner so that each of the voltage sampling circuits obtains the voltage signal of the output port connected thereto.

[0007] In one embodiment of the present application, the current acquisition gating subunit includes multiple pairs of current sampling circuits and multiple pairs of switches that are integrated together, each pair of the current sampling circuits is connected to one of the output ports, each pair of the current sampling circuits is provided with a pair of switches, and the multiple pairs of switches are connected to the signal processing control unit, and the signal processing control unit is also used to control the closure of the switches on each pair of the current sampling circuits in a time-sharing manner so that each pair of the current sampling circuits obtains the current signal of the output port connected thereto.

[0008] In one embodiment of the present application, the current acquisition gating subunit further includes: a plurality of current sampling resistors, each pair of the current sampling circuits being connected in parallel to the two ends of one of the current sampling resistors; the current sampling resistor is used to convert the current signal acquired by the current sampling circuit connected in parallel therewith into a voltage signal.

[0009] In one embodiment of the present application, the signal processing control unit includes: an analog-to-digital conversion subunit, which is used to perform analog-to-digital conversion on the voltage signal and / or current signal obtained from each of the output ports to obtain an actual voltage corresponding to each voltage signal and / or an actual current corresponding to each current signal.

[0010] In one embodiment of the present application, the input end of the power supply circuit is used to connect to the power supply device, and the output end of the power supply circuit is used to connect to the device to be charged. The signal processing control unit also includes: a protocol control subunit, which is used to determine the charging voltage of the device to be charged according to the charging protocol of the device to be charged; and a voltage conversion subunit, which is connected to the protocol control subunit and is used to convert the power supply voltage of the power supply device into the charging voltage.

[0011] In one embodiment of the present application, the monitoring circuit further includes: a filtering unit connected between the voltage acquisition and gating subunit and the signal processing and control unit, for filtering each of the voltage signals acquired by the voltage acquisition and gating subunit in a time-sharing manner.

[0012] In one embodiment of the present application, the monitoring circuit further includes: a current amplifying unit, connected between the current acquisition gating subunit and the signal processing control unit, for amplifying each current signal acquired by the current acquisition gating subunit in a time-sharing manner.

[0013] According to another aspect of the present application, a charger is provided, comprising the monitoring circuit of the power supply circuit.

[0014] According to the monitoring circuit and charger of the power supply circuit of the embodiment of the present application, the voltage signal and / or current signal of each output port can be acquired separately and in time by the acquisition selection unit, so that the voltage information and / or current information of each output port can be monitored without independently setting up multiple current and voltage acquisition circuits, which not only realizes the intelligent control of each output port, but also can effectively reduce the volume of the product for monitoring the current and reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0016] Figure 1 A structural block diagram of a monitoring circuit for a power supply circuit according to an embodiment of the present application is shown.

[0017] Figure 2 A structural block diagram of a monitoring circuit for a power supply circuit according to another embodiment of the present application is shown.

[0018] Figure 3 A structural block diagram of a collection gating unit according to an embodiment of the present application is shown.

[0019] Figure 4 A schematic diagram of the structure of a voltage acquisition gating subunit according to an embodiment of the present application is shown.

[0020] Figure 5 A schematic structural diagram of a filtering unit according to an embodiment of the present application is shown.

[0021] Figure 6 A schematic structural diagram of a current acquisition gating subunit according to an embodiment of the present application is shown.

[0022] Figure 7 A schematic structural diagram of a current amplifying unit according to an embodiment of the present application is shown.

[0023] Figure 8 A schematic structural diagram of an analog-to-digital conversion subunit according to an embodiment of the present application is shown.

[0024] Fig. 9 A partial structural schematic diagram of a monitoring circuit according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0026] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0027] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "a", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0028] In order to thoroughly understand the present application, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail as follows, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0029] Reference below Figure 1 A monitoring circuit for a power supply circuit according to an embodiment of the present application is described. Figure 1 As shown, a monitoring circuit of a power supply circuit has multiple output ports, and the monitoring circuit includes: an acquisition gating unit 110, the input end of the acquisition gating unit 110 can be connected to the multiple output ports, and the acquisition gating unit 110 is used to obtain the voltage signal and / or current signal of each of the output ports in a time-sharing manner; a signal processing control unit 120, which is used to process the obtained voltage signal and / or current signal of each of the output ports to obtain an actual voltage corresponding to each voltage signal and / or an actual current corresponding to each current signal.

[0030] Exemplarily, the acquisition gating unit 110 can be connected to multiple output ports such as output port 1, output port 2, ..., output port N. Time sharing refers to dividing a period of time into a number of time segments, and the acquisition gating unit 110 can obtain a voltage signal and / or a current signal of one of the multiple output ports in each time segment, so there is no need to design multiple current and voltage acquisition circuits. The acquisition gating unit 110 can obtain the voltage signals and / or current signals of all output ports within a total time-sharing period.

[0031] The acquisition selection unit 110 can send the acquired voltage signal and / or current signal of each output port to the signal processing control unit 120 in sequence according to the acquisition order, and the signal processing control unit 120 processes the acquired voltage signal and / or current signal of each output port to obtain the actual voltage corresponding to each voltage signal and / or the actual current corresponding to each current signal.

[0032] According to the monitoring circuit of the power supply circuit of the present application, the voltage signal and / or current signal of each output port can be acquired separately and in time by collecting the selection unit 110, so that the voltage information and / or current information of each output port can be monitored without independently setting up multiple current and voltage collection circuits, which not only realizes the intelligent control of each output port, but also can effectively reduce the volume of the product for monitoring the current and reduce the cost.

[0033] In one example, the output port may be a USB Type-A interface, a USB Type-B interface, a USB Type-C interface, a Lightning interface, etc., without limitation. The multiple output ports may be output ports of the same type or output ports of different types, without limitation.

[0034] In one example, if Figure 2 As shown, the acquisition gating unit 110 includes: a voltage acquisition gating subunit 111, the input end of the voltage acquisition gating subunit 111 can be connected to at least one of the multiple output ports, and the voltage acquisition gating subunit 111 is used to respectively acquire the voltage signal of each output port connected thereto in time-sharing manner.

[0035] In one example, the voltage acquisition gating subunit 111 includes multiple voltage sampling circuits and multiple switches that are integrated together, each of the voltage sampling circuits is connected to one of the output ports, each of the voltage sampling circuits is provided with one of the switches, and the multiple switches are connected to the signal processing control unit 120. The signal processing control unit 120 is also used to control the closure of each switch on the voltage sampling circuit in a time-sharing manner so that each of the voltage sampling circuits obtains the voltage signal of the output port connected thereto.

[0036] For example, Figure 4 As shown, the voltage acquisition gating subunit U6 includes multiple voltage sampling circuits such as S1, S2...SN, which are integrated. The voltage sampling circuit S1 has an input terminal VBUS1 connected to one of the output ports, the voltage sampling circuit S2 has an input terminal VBUS2 connected to one of the output ports... The voltage sampling circuit SN has an input terminal VBUSN connected to one of the output ports, and each voltage sampling circuit is provided with a switch, and all switches are connected to the signal processing control unit 120. Among them, the signal processing control unit 120 can control the closure of the switch on each voltage sampling circuit in time-sharing, so that each voltage sampling circuit is turned on in time-sharing, so that each voltage sampling circuit can obtain the voltage signal of the output port connected thereto during the conduction period. The output terminals of multiple voltage sampling circuits such as S1, S2...SN can be connected to the same output node VBUS, so that the acquired voltage sampling circuits are sequentially sent to the signal processing control unit 120 through the output node in the acquisition order.

[0037] In one example, if Figure 2 As shown, the monitoring circuit further includes: a filtering unit 131 connected between the voltage acquisition and gating subunit 111 and the signal processing and control unit 120, for filtering each voltage signal acquired by the voltage acquisition and gating subunit 111 in a time-sharing manner.

[0038] Among them, by filtering the voltage signal through the filtering unit 131, operations such as smoothing, removing noise, and adjusting frequency response can be performed on the voltage signal to improve the quality and reliability of the voltage signal.

[0039] In an example, the composition structure of the filtering unit 131 may include various forms. For example, the filtering unit 131 may be a low-pass filter, a high-pass filter, a band-pass filter, a band-stop filter, etc., which is not limited.

[0040] Taking a low-pass filter as an example, the low-pass filter only allows low-frequency signals in the voltage signal to pass through, while signals higher than this frequency are attenuated or eliminated, thereby smoothing the voltage and removing high-frequency noise to obtain a pure signal for subsequent processing.

[0041] For example, Figure 5 As shown, the low-pass filter may include a resistor R3, a resistor R4, a resistor R5 and a capacitor C9, the resistor R3 and the resistor R4 are connected in series, the first end of the resistor R3 may be connected to the output node VBUS of the plurality of voltage sampling circuits, the second end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is grounded, the resistor R5 and the capacitor C9 are connected in series, the series-connected resistor R5 and the capacitor C9 are connected in parallel to the two ends of the resistor R4, that is, the first end of the resistor R5 is connected to the first end of the resistor R4, the second end of the resistor R5 is connected to the first end of the capacitor C9, and the second end of the capacitor C9 is connected to the second end of the resistor R4. In addition, the second end of the resistor R5 may be connected to the input end VBUS_ADC of the signal processing control unit 120.

[0042] In one example, if Figure 2 As shown, the acquisition gating unit 110 includes: a current acquisition gating subunit 112, the input end of the current acquisition gating subunit 112 can be connected to at least one of the multiple output ports, and the current acquisition gating subunit 112 is used to respectively acquire the current signal of each output port connected thereto in time-sharing manner.

[0043] In one example, the current acquisition gating subunit 112 includes multiple pairs of current sampling circuits and multiple pairs of switches that are integrated together, each pair of current sampling circuits is connected to an output port, each pair of current sampling circuits is provided with a pair of switches, and the multiple pairs of switches are connected to the signal processing control unit 120. The signal processing control unit 120 is also used to control the closure of the switches on each pair of current sampling circuits in a time-sharing manner so that each pair of current sampling circuits obtains the current signal of the output port connected thereto.

[0044] For example, Figure 6As shown, the current acquisition gating subunit U5 includes multiple pairs of current sampling circuits such as S1A / S1B, S2A / S2B...SNA / SNB, etc., which are integrated. The current sampling circuit S1A / S1B has an input terminal IOUT1+ / IOUT1- connected to one of the output ports, and the current sampling circuit S2A / S2B has an input terminal IOUT2+ / IOUT2- connected to one of the output ports... The current sampling circuit SNA / SNB has an input terminal IOUTN+ / IOUTN- connected to one of the output ports. A pair of switches is provided on each pair of current sampling circuits, and all switches are connected to the signal processing control unit 120. The signal processing control unit 120 can control the closure of the switches on each pair of current sampling circuits in time-sharing, so that each pair of current sampling circuits can be turned on in time-sharing, so that each pair of current sampling circuits can obtain the current signal of the output port connected thereto during the conduction period. The output ends of multiple current sampling circuits such as S1A / S1B, S2A / S2B...SNA / SNB can be connected to the same pair of output nodes IOUT+ / IOUT-, so that the acquired current sampling circuits are sent to the signal processing control unit 120 in sequence through the pair of output nodes in the acquisition order.

[0045] In one example, the current acquisition gating subunit 112 further includes: a plurality of current sampling resistors, each pair of current sampling circuits being connected in parallel to two ends of a current sampling resistor; the current sampling resistor is used to convert the current signal acquired by the current sampling circuit connected in parallel therewith into a voltage signal.

[0046] For example, Fig. 9 As shown, the current acquisition selection subunit 112 includes a plurality of current sampling resistors such as a current sampling resistor R1, a current sampling resistor R2, ..., a current sampling resistor RN, etc. Taking the current sampling resistor R1 as an example, the current sampling circuit S1A / S1B is connected in parallel to both ends of the current sampling resistor R1, that is, the input end IOUT1+ of the current sampling circuit S1A is connected to the first end of the current sampling resistor R1, and the input end IOUT1- of the current sampling circuit S1B is connected to the second end of the current sampling resistor R1. According to the formula between voltage, current and resistance, according to the resistance value of the current sampling resistor R1, the current signal collected by the current sampling circuit S1A / S1B can be converted into a voltage signal.

[0047] In one example, the monitoring circuit further includes: a current amplifying unit 132 connected between the current acquisition gating subunit 112 and the signal processing control unit 120, for amplifying each current signal acquired by the current acquisition gating subunit 112 in a time-sharing manner.

[0048] In an example, the component structure of the current amplifying unit 132 may include various forms. For example, the current amplifying unit 132 may be an operational amplifier, a differential amplifier, etc., which is not limited.

[0049] For example, Figure 7 As shown, the current amplification unit 132 may include a capacitor C2, an operational amplifier U3 and a capacitor C5, the output node IOUT+ / IOUT- may be connected to the input terminal IN+ / IN- of the operational amplifier U3 through circuit 4 and circuit 5 respectively, the capacitor C2 is connected in parallel between circuit 4 and circuit 5, the input terminal OUT of the operational amplifier U3 may be connected to the input terminal IOUT_ADC of the signal processing control unit 120 through circuit 6, the operational amplifier U3 may also be connected to the power supply voltage VCC and the ground through circuit 3 and circuit 2 respectively, and the capacitor C5 is connected in parallel between circuit 3 and circuit 2.

[0050] In one example, if Figure 3 As shown, the signal processing control unit 120 includes: an analog-to-digital conversion subunit 121 for performing analog-to-digital conversion on the acquired voltage signal and / or current signal of each output port to obtain an actual voltage corresponding to each voltage signal and / or an actual current corresponding to each current signal.

[0051] In an example, the analog-to-digital conversion subunit 121 can be a successive approximation ADC, a parallel comparison ADC, a continuous-time Σ-Δ ADC, a single-shot integration ADC, etc., without limitation.

[0052] For example, Figure 8 A schematic diagram of an analog-to-digital conversion subunit U2 is shown. The analog-to-digital conversion subunit 121 can be connected to the voltage acquisition gating subunit 111 and the current acquisition gating subunit 112 through VBUS_ADC and IOUT_ADC, respectively. The analog-to-digital conversion subunit 121 can perform analog-to-digital conversion on the voltage signal and / or current signal sent by the voltage acquisition gating subunit 111 and / or the current acquisition gating subunit 112, thereby obtaining the actual voltage corresponding to each voltage signal and / or the actual current corresponding to each current signal, and realizing the monitoring of the voltage information and / or current information of each output port.

[0053] In one example, the input end of the power supply circuit is used to connect to the power supply device, and the output end of the power supply circuit is used to connect to the device to be charged. The signal processing control unit 120 also includes: a protocol control subunit 122, which is used to determine the charging voltage of the device to be charged according to the charging protocol of the device to be charged; a voltage conversion subunit 123, which is connected to the protocol control subunit 122, and is used to convert the power supply voltage of the power supply device into a charging voltage.

[0054] For example, Fig. 9 As shown, the protocol control subunit 122 and the voltage conversion subunit 123 can be integrated together. The power supply circuit has multiple output ports, each of which can be connected to a device to be charged. The signal processing control unit 120 may include multiple protocol control subunits 122 and multiple voltage conversion subunits 123, each of which is used to determine the charging voltage of a device to be charged and provide the charging voltage to the device to be charged. For example, the protocol control subunit and the voltage conversion subunit 1 can determine the charging voltage of the device to be charged 1 and provide the charging voltage to the device to be charged 1, the protocol control subunit and the voltage conversion subunit 2 can determine the charging voltage of the device to be charged 2 and provide the charging voltage to the device to be charged 2, and so on, the protocol control subunit and the voltage conversion subunit N can determine the charging voltage of the device to be charged N and provide the charging voltage to the device to be charged N.

[0055] In one example, the power supply device may be a power supply, a power supply circuit, etc., which is not limited.

[0056] In one example, the device to be charged may be a mobile phone, a tablet, headphones, a smart watch, a laptop computer, etc., without limitation.

[0057] In one example, the charging protocol may be a USB-PD protocol, a QC protocol, etc., which is not limited.

[0058] In an example, the voltage conversion subunit 123 may be a DC-DC converter, an AC-DC converter, etc., which is not limited thereto.

[0059] In one example, the signal processing control unit 120 may be implemented as an MCU.

[0060] In an example, the voltage acquisition and gating subunit 111, the current acquisition and gating subunit 112, the filtering unit 131, the current amplifying unit 132, the signal processing control unit 120, etc. can also be integrated on a circuit board.

[0061] According to another aspect of the present application, a charger is provided, wherein the charger includes a monitoring circuit for a power supply circuit.

[0062] Among them, the monitoring circuit of the power supply circuit can be implemented as the monitoring circuit of the power supply circuit mentioned above, and reference can be made to the introduction mentioned above, which will not be repeated here.

[0063] In one example, the charger may be a mobile phone charger, a tablet charger, an earphone charger, a smart watch charger, a laptop computer charger, etc., without limitation.

[0064] To summarize, according to the monitoring circuit and charger of the power supply circuit of the embodiment of the present application, the voltage signal and / or current signal of each output port can be acquired separately in time by the acquisition selection unit, so that the voltage information and / or current information of each output port can be monitored without independently setting up multiple current and voltage acquisition circuits, which not only realizes the intelligent control of each output port, but also can effectively reduce the volume of the product for monitoring the current and reduce the cost.

[0065] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0066] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0067] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0068] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A monitoring circuit for a power supply circuit, characterized in that: The power supply circuit has a plurality of output ports, and the monitoring circuit comprises: A collection gating unit, wherein the input end of the collection gating unit can be connected to the multiple output ports, and the collection gating unit is used to respectively acquire the voltage signal and / or current signal of each of the output ports in a time-sharing manner; The signal processing control unit is used to process the acquired voltage signal and / or current signal of each output port to obtain an actual voltage corresponding to each voltage signal and / or an actual current corresponding to each current signal.

2. The monitoring circuit for a power supply circuit according to claim 1, characterized in that: The acquisition gating unit comprises: A voltage acquisition gating subunit, wherein the input end of the voltage acquisition gating subunit can be connected to at least one of the multiple output ports, and the voltage acquisition gating subunit is used to respectively acquire the voltage signal of each of the output ports connected thereto in a time-sharing manner; A current acquisition gating subunit, wherein the input end of the current acquisition gating subunit can be connected to at least one of the multiple output ports, and the current acquisition gating subunit is used to respectively acquire the current signal of each of the output ports connected thereto in a time-sharing manner.

3. The monitoring circuit for a power supply circuit according to claim 2, characterized in that: The voltage acquisition gating subunit includes a plurality of voltage sampling circuits and a plurality of switches that are integrated, each of the voltage sampling circuits is connected to one of the output ports, each of the voltage sampling circuits is provided with one of the switches, and the plurality of switches are connected to the signal processing control unit, and the signal processing control unit is also used to control the closure of the switches on each of the voltage sampling circuits in a time-sharing manner, so that each of the voltage sampling circuits acquires the voltage signal of the output port connected thereto.

4. The monitoring circuit for a power supply circuit according to claim 2, characterized in that: The current acquisition gating subunit includes multiple pairs of current sampling circuits and multiple pairs of switches that are integrated, each pair of the current sampling circuits is connected to one of the output ports, each pair of the current sampling circuits is provided with a pair of switches, and the multiple pairs of switches are connected to the signal processing control unit, and the signal processing control unit is also used to control the closure of the switches on each pair of the current sampling circuits in a time-sharing manner, so that each pair of the current sampling circuits obtains the current signal of the output port connected thereto.

5. The monitoring circuit for a power supply circuit according to claim 4, characterized in that: The current acquisition gating subunit also includes: A plurality of current sampling resistors, each pair of the current sampling circuits are respectively connected in parallel to the two ends of one of the current sampling resistors; the current sampling resistor is used to convert the current signal obtained by the current sampling circuit connected in parallel therewith into a voltage signal.

6. The monitoring circuit for a power supply circuit according to claim 1, characterized in that: The signal processing control unit comprises: The analog-to-digital conversion subunit is used to perform analog-to-digital conversion on the voltage signal and / or current signal obtained from each of the output ports to obtain an actual voltage corresponding to each voltage signal and / or an actual current corresponding to each current signal.

7. The monitoring circuit for a power supply circuit according to claim 6, characterized in that: The input end of the power supply circuit is used to connect to the power supply device, and the output end of the power supply circuit is used to connect to the device to be charged. The signal processing control unit also includes: A protocol control subunit, configured to determine a charging voltage of the device to be charged according to a charging protocol of the device to be charged; A voltage conversion subunit is connected to the protocol control subunit, and the voltage conversion subunit is used to convert the supply voltage of the power supply device into the charging voltage.

8. The monitoring circuit for a power supply circuit according to claim 2, characterized in that: The monitoring circuit further comprises: The filtering unit is connected between the voltage acquisition and gating subunit and the signal processing and control unit, and is used for filtering each of the voltage signals acquired by the voltage acquisition and gating subunit in a time-sharing manner.

9. The monitoring circuit for a power supply circuit according to claim 2, characterized in that: The monitoring circuit further comprises: The current amplifying unit is connected between the current acquisition gating subunit and the signal processing control unit, and is used to amplify each current signal acquired by the current acquisition gating subunit in a time-sharing manner.

10. A charger, characterized in that: A monitoring circuit comprising the power supply circuit according to any one of claims 1 to 9.

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