A multi-loop controlled power supply

Abstract

The present invention discloses a multi-loop controlled power supply, comprising: a bandgap reference module for providing a reference voltage and a positive temperature coefficient voltage; an LDO for providing a reference voltage and a reference voltage for an NTC adaptive control loop, a temperature adaptive control loop, a constant current output control loop, a fast charge protocol control loop, and a constant voltage output control loop; a temperature adaptive control loop for generating a first difference current based on a positive temperature coefficient voltage and a second reference voltage; an NTC adaptive control loop for generating a second difference current based on a second reference voltage and a negative temperature coefficient voltage; a constant current output control loop for generating a third difference current based on the first reference voltage and the power supply output current; a fast charge protocol control loop for outputting a corresponding adjusted current when a preset constant voltage changes; and a constant voltage output control loop for outputting a preset constant voltage or current. The present invention improves the operating safety of the power supply and mobile devices, and achieves compatibility with mobile devices from different manufacturers on the market.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic circuits, and in particular relates to a multi-loop controlled power supply. Background Art

[0002] With the continuous advancement of communication technology, various portable devices, such as smartphones, have become an integral part of people's daily lives. The frequent use of these electronic devices has led to a demand for longer battery life, but due to limited battery capacity and technological advancements, they can only be recharged multiple times. The advent of power banks has greatly alleviated this problem. However, traditional power banks suffer from low output power and long charging times, severely impacting their efficiency. Currently, fast-charging technology is rapidly developing, but there is no unified fast-charging protocol among major manufacturers. To accommodate the charging needs of a wide range of devices, power banks need to be compatible with multiple fast-charging protocols.

[0003] In existing technology, mobile power banks are typically powered by lithium batteries, which typically have a voltage of 4.2V. However, the fast-charging protocol requires high voltage and high current outputs; for example, the PD protocol requires outputs of 5V@3A, 9V@2A, and 12V@1.5A. Improper use or improper operation of the mobile power bank can cause the lithium battery to overheat. Continuing to output high current and voltage as required by the fast-charging protocol will cause the lithium battery and chip temperatures to continue to rise, reducing the lifespan of the lithium battery and electronic components and compromising safety during normal use. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a multi-loop controlled power supply. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] The present invention provides a multi-loop controlled power supply, comprising: a bandgap reference module, a linear regulator LDO, a fast charging protocol control loop, a fast charging protocol interaction processing module, a negative temperature coefficient NTC adaptive control loop, a temperature adaptive control loop, a constant current output control loop, and a constant voltage output control loop;

[0006] The bandgap reference module is used to provide a reference voltage for the LDO and a positive temperature coefficient voltage related to the chip temperature for the temperature adaptive control loop;

[0007] An LDO, under the control of the fast charge protocol interaction processing module, is used to provide a first reference voltage for the constant current output control loop based on a preset fast charge protocol and the reference voltage, provide a second reference voltage for the NTC adaptive control loop and the temperature adaptive control loop based on the reference voltage, and provide a third reference voltage for the fast charge protocol control loop;

[0008] a temperature adaptive control loop, configured to generate a first difference current based on the positive temperature coefficient voltage and the second reference voltage;

[0009] An NTC adaptive control loop, configured to generate a second difference current based on the second reference voltage and a negative temperature coefficient voltage related to the battery temperature;

[0010] a constant current output control loop, configured to generate a third difference current based on the first reference voltage and an actual output current of the power supply;

[0011] A fast-charge protocol control loop, used to output an adjusted current when the preset constant voltage changes;

[0012] A constant voltage output control loop is configured to output a preset constant voltage or a preset constant current based on the first difference current, the second difference current, the third difference current, and the adjustment current.

[0013] In one embodiment of the present invention, the constant current output control loop includes an output current detection circuit, a filter circuit, a first operational amplifier, a capacitor C1 and a first current mirror unit; wherein,

[0014] The current detection circuit is configured to sample the output preset constant current and convert it into a first voltage;

[0015] The filtering circuit is used to filter the first voltage;

[0016] The first operational amplifier is configured to perform a proportional operation on the filtered first voltage and the first reference voltage;

[0017] The first mirror current module is used to replicate the output result of the first operational amplifier according to a preset ratio.

[0018] In one embodiment of the present invention, the output current detection circuit includes a second operational amplifier, a chopper operational amplifier, MOS tubes: M1, M2, resistors: R1, R2, R3, R4, an output terminal VoutSP and an output terminal VoutSN; wherein,

[0019] The output terminal of the second operational amplifier is connected to the gate of M1, the drain of M1 is connected to the output terminal VoutSP via R1, and the source of M1 is grounded via R2. The non-inverting input terminal of the second operational amplifier is connected to the reference voltage, and the inverting input terminal is connected to the source of M1. The output terminal of the chopper operational amplifier is connected to the gate of M2, the drain of M2 is connected to the output terminal VoutSN via R3, and the source of M2 is grounded via R4. The first input terminal of the chopper operational amplifier is connected to the drain of M1, and the second input terminal is connected to the drain of M2.

[0020] In one embodiment of the present invention, the filtering circuit includes resistors: R6, R7, R8, nodes: N1, N2 and capacitors: C2, C3; wherein,

[0021] One end of R6 is connected to the source of M2, and the other end is connected to the inverting input terminal of the first operational amplifier through R7 and R8. Node N1 is located between R6 and R7, and node N2 is located between R7 and R8. One end of C2 is connected to node N1 and the other end is grounded. One end of C3 is connected to node N2 and the other end is grounded.

[0022] In one embodiment of the present invention, the non-inverting input terminal of the first operational amplifier is connected to the first reference voltage, and the output terminal is connected to the first current mirror unit, the two ends of C1 are respectively connected to the inverting input terminal and the output terminal of the second operational amplifier, and the first current mirror unit is connected to the feedback module in the constant voltage output control loop.

[0023] In one embodiment of the present invention, the constant voltage output control loop further includes: a feedback voltage output port and a constant voltage output port, and the feedback module includes a resistor: R H and R L and node N3; wherein,

[0024] R H One end is connected to the constant voltage output port, and the other end is connected to the constant voltage output port. L Ground, node N3 is located at R H With R L Node N3 is connected to the feedback voltage output port.

[0025] In one embodiment of the present invention, the fast charge protocol control loop includes a third operational amplifier, a MOS tube M3, a second current mirror unit, a resistor R5 and a third current mirror unit; wherein,

[0026] The output end of the third operational amplifier is connected to the gate of M3, the non-inverting input end is connected to the third reference voltage, and the inverting input end is connected to the source of M3. The source of M3 is grounded through R5. The drain of M3 is connected to the second current mirror unit, the second current mirror unit is connected to the third current mirror unit, and the third current mirror unit is connected to the feedback module.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a multi-loop controlled power supply, which can enable the output voltage of the constant voltage output control loop to adaptively follow the temperature changes of the lithium battery and the chip temperature, thereby improving the operating safety of the power supply and mobile devices; at the same time, the multi-loop controlled power supply provided by the present invention can provide constant voltage and constant current for the load according to the requirements of most fast charging protocols on the market, thereby achieving compatibility with mobile devices of different manufacturers on the market.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of a multi-loop controlled power supply provided by an embodiment of the present invention;

[0031] Figure 2 is a circuit diagram of a constant current output control loop provided by an embodiment of the present invention;

[0032] Figure 3 is a circuit diagram of a fast charging protocol control loop provided by an embodiment of the present invention;

[0033] Figure 4 4 is a circuit diagram of a temperature adaptive control loop and an NTC adaptive control loop provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0035] Figure 1 FIG. 1 is a schematic diagram of a structure of a multi-loop controlled power supply provided by an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a multi-loop controlled power supply, including: a bandgap reference module, a linear regulator LDO, a fast charging protocol control loop, a fast charging protocol interaction processing module, a negative temperature coefficient NTC adaptive control loop, a temperature adaptive control loop, a constant current output control loop and a constant voltage output control loop;

[0036] The bandgap reference module is used to provide a reference voltage for the LDO and a positive temperature coefficient voltage related to the chip temperature for the temperature adaptive control loop;

[0037] An LDO is used to provide a first reference voltage for the constant current output control loop based on a preset fast charging protocol and a reference voltage under the control of the fast charging protocol interaction processing module, provide a second reference voltage for the NTC adaptive control loop and the temperature adaptive control loop based on the reference voltage, and provide a third reference voltage for the fast charging protocol control loop;

[0038] a temperature adaptive control loop for generating a first difference current based on a positive temperature coefficient voltage and a second reference voltage;

[0039] An NTC adaptive control loop, configured to generate a second difference current based on a second reference voltage and a negative temperature coefficient voltage related to a battery temperature;

[0040] a constant current output control loop, configured to generate a third difference current based on the first reference voltage and the actual output current of the power supply;

[0041] A fast-charge protocol control loop, used to output an adjusted current when the preset constant voltage changes;

[0042] The constant voltage output control loop is used to output a preset constant voltage or a preset constant current based on the first difference current, the second difference current, the third difference current and the adjustment current.

[0043] In this embodiment, the bandgap reference module provides a reference voltage of 1.2V for the LDO, and the fast charging protocol interaction processing module is used to process multiple preset fast charging protocols such as PPS, PD3.0, PD2.0, QC4+, QC4, QC3.0, QC2.0, AFC, FCP, SCP, PE2.0, PE1.1 and SFCP protocols. The fast charging protocol interaction processing module can control the LDO output and the adjustment current output of the fast charging protocol control loop according to the fast charging protocol. The LDO is used to provide a first reference voltage and a reference voltage for the constant current output control loop, provide a second reference voltage for the NTC adaptive control loop and the temperature adaptive control loop, and provide a third reference voltage for the fast charging protocol control loop.

[0044] Figure 2 is a circuit diagram of a constant current output control loop provided by an embodiment of the present invention. Optionally, the constant current output control loop includes an output current detection circuit, a filter circuit, a first operational amplifier CC_EA, a capacitor C1, and a first current mirror unit; wherein,

[0045] A current detection circuit is used to sample the output preset constant current and convert it into a first voltage;

[0046] A filter circuit, configured to filter the first voltage;

[0047] a first operational amplifier, configured to perform a proportional operation on the filtered first voltage and the first reference voltage;

[0048] The first mirror current module is used to copy the output result of the first operational amplifier according to a preset ratio.

[0049] Specifically, the output current detection circuit includes a second operational amplifier, a chopper operational amplifier, MOS tubes: M1, M2, resistors: R1, R2, R3, R4, an output terminal VoutSP and an output terminal VoutSN; wherein,

[0050] The output terminal of the second operational amplifier is connected to the gate of M1, the drain of M1 is connected to the output terminal VoutSP via R1, and the source of M1 is grounded via R2. The non-inverting input terminal of the second operational amplifier is connected to the reference voltage, and the inverting input terminal is connected to the source of M1; the output terminal of the chopper operational amplifier is connected to the gate of M2, the drain of M2 is connected to the output terminal VoutSN via R3, and the source of M2 is grounded via R4. The first input terminal of the chopper operational amplifier is connected to the drain of M1, and the second input terminal is connected to the drain of M2.

[0051] Furthermore, if Figure 2 As shown, the filter circuit includes resistors: R6, R7, R8, nodes: N1, N2 and capacitors: C2, C3; wherein,

[0052] One end of R6 is connected to the source of M2, and the other end is connected to the inverting input terminal of the first operational amplifier through R7 and R8. Node N1 is located between R6 and R7, and node N2 is located between R7 and R8. One end of C2 is connected to node N1, and the other end is grounded. One end of C3 is connected to node N2, and the other end is grounded.

[0053] Please continue to see Figure 2 The non-inverting input terminal of the first operational amplifier is connected to the reference voltage, and the output terminal is connected to the input terminal of the first current mirror unit. The two ends of C1 are respectively connected to the inverting input terminal and output terminal of the second operational amplifier. The output terminal of the first current mirror unit is connected to the feedback module in the constant voltage output control loop.

[0054] The constant voltage output control loop also includes: feedback voltage output port and constant voltage output port, and the feedback module includes resistor: R H and R L and node N3; wherein,

[0055] R H One end is connected to the constant voltage output port, and the other end is connected to the constant voltage output port. L Ground, node N3 is located at R H With R L Node N3 is connected to the feedback voltage output port.

[0056] In this embodiment, the output current detection circuit detects the preset constant current output by detecting the voltage across an off-chip high-precision 5mΩ resistor. Because the voltage drop across the 5mΩ high-precision resistor is very small, approximately a few millivolts to more than ten millivolts, it is easily affected by noise and offset. Therefore, a chopper operational amplifier is introduced. The first operational amplifier CC_EA is a transconductance operational amplifier, connected as an integrator, which can increase the DC gain of the constant current output control loop, thereby improving the output accuracy of the constant current output control loop. When the constant current output by the power supply does not reach the preset constant current, the constant current output control loop does not affect the feedback voltage of the constant voltage output control loop, and the power supply outputs the preset constant voltage. When the constant current output by the power supply reaches the preset constant current, the power supply outputs the preset constant current. If the load impedance suddenly decreases, the output voltage of the power supply will decrease, and the load current will also decrease. However, due to the action of the constant voltage output control loop, the output voltage will be adjusted to the preset constant voltage. If the load impedance remains unchanged, the load current will increase, which contradicts the function of the constant current output control loop and may cause output current instability.

[0057] In order to solve the above problems, the present invention changes the feedback voltage of the constant voltage output control loop through the output current of the first operational amplifier CC_EA to eliminate the influence of the constant voltage output control loop. For example, when the load suddenly decreases, the feedback voltage of the constant voltage output control loop decreases, but under the action of the constant current output control loop, the feedback voltage will increase to the first reference voltage CC_Vref of the constant voltage output control loop. The constant voltage output control loop does not play a regulating role, and the final output voltage is lower than the preset constant voltage. It can be seen that the constant current output control loop can maintain the constant output current by reducing the output voltage. The non-inverting input terminal of the first operational amplifier CC_EA is the first reference voltage CC_Vref, and the inverting input terminal is the feedback voltage. Since the constant current output control loop is a deep negative feedback loop, the first reference voltage CC_Vref is equal to the feedback voltage detected by the output current detection circuit in steady state. Therefore, the preset constant current of the power supply can be set by changing the first reference voltage CC_Vref, wherein the first reference voltage CC_Vref is controlled by the fast charging protocol interaction processing module according to the preset fast charging protocol to control the LDO setting, and the preset constant current is:

[0058]

[0059] Where Iout represents the preset constant current output by the power supply, in A, and CC_Vref represents the reference voltage, in V.

[0060] Figure 3 : is a circuit diagram of a fast charge protocol control loop provided by an embodiment of the present invention. Specifically, Figure 3As shown, the fast charge protocol control loop includes a third operational amplifier, a MOS tube M3, a second current mirror unit, a resistor R5 and a third current mirror unit; wherein,

[0061] The output end of the third operational amplifier is connected to the gate of M3, the non-inverting input end is connected to the third reference voltage, and the inverting input end is connected to the source of M3. The source of M3 is grounded via R5. The drain of M3 is connected to the second current mirror unit. The second current mirror unit is connected to the third current mirror unit. The third current mirror unit is connected to the feedback module.

[0062] See Figure 3 , the third current mirror unit can be regarded as a current source array, which reduces the feedback voltage of the constant voltage output control loop by extracting current. Specifically, it outputs a higher preset constant voltage by extracting current to reduce the feedback voltage of the constant voltage output control loop. For example, when the power supply is in a non-fast charging condition, the signal terminal S1-S10 switches are all closed, the feedback voltage is not adjusted, and the power supply outputs a stable voltage of 5V; when the power supply is in a fast charging condition, the fast charging protocol interaction processing module dynamically adjusts the signal terminal S1-S10 switches to extract different currents to reduce the feedback voltage and thus achieve the corresponding output voltage. The fast charging protocol control loop adjusts the output value of the third current mirror unit according to different fast charging protocols, thereby achieving a step-by-step output of 5V to 12.03V with a step size of 10mV.

[0063] In this embodiment, the step size can be set by modifying the third reference voltage Vref1 and the value of R5. In steady-state operation, the feedback voltage VFB is 1.2V, then:

[0064]

[0065] Among them, Vref1 is the reference voltage, the unit is V, ΔV is the adjustment step, the unit is V, R L 、R H R and R5 are both resistors, with the unit being Ω.

[0066] The constant voltage output control loop provided by the example of the present invention is a BOOST boost converter architecture with peak current mode control. The constant voltage output control loop is the core loop of the power supply. The constant current output control loop, the fast charging protocol control loop, the temperature adaptive control loop and the NTC adaptive control loop are all nested in the constant voltage output control loop. The feedback voltage of the constant voltage output control loop is adjusted by extracting or injecting current, thereby achieving a preset constant output voltage or output current. When the constant current output control loop, the fast charging protocol control loop, the temperature adaptive control loop and the NTC adaptive control loop do not affect the feedback voltage of the constant voltage output control loop, the power supply outputs a constant 5V voltage.

[0067] Figure 4 1 is a circuit diagram of a temperature adaptive control loop and an NTC adaptive control loop provided by an embodiment of the present invention. Figure 4 As shown, the temperature adaptive control loop and NTC adaptive control loop are both embedded within the constant voltage output control loop, consisting of an NTC adaptive control loop OTA, a temperature adaptive control loop OTA, an NTC voltage module, and a current mirror module. The NTC adaptive control loop OTA and the temperature adaptive control loop OTA convert the difference between the negative temperature coefficient voltage NTC, the positive temperature coefficient voltage V_ptat, and a second reference voltage Vref into a current, which is used to change the feedback voltage of the constant voltage output control loop. The NTC voltage module outputs a negative temperature coefficient voltage related to the battery temperature, and the bandgap reference module outputs a positive temperature coefficient voltage V_ptat. When V_ptat exceeds the temperature loop threshold, the temperature adaptive control loop has no effect on the output voltage. When V_ptat exceeds the threshold set by the temperature adaptive control loop, as the temperature rises, the temperature adaptive control loop amplifier outputs a continuously increasing difference current, which in turn increases the feedback voltage, causing the output voltage to continuously decrease until the chip temperature reaches the overtemperature threshold, shutting down the power supply. The NTC adaptive control loop continuously monitors the battery temperature. When the NTC voltage is above the adaptive threshold, the NTC adaptive loop has no effect on the output voltage. When the NTC voltage is below the set threshold, as the battery temperature continues to rise, the NTC adaptive control loop outputs a larger differential current, increasing the feedback voltage of the constant-voltage output control loop, thereby continuously reducing the output voltage until the battery temperature reaches the overtemperature threshold, shutting down the power supply. This shows that the temperature adaptive control loop and the NTC adaptive control loop can achieve adaptive reduction of the output voltage.

[0068] In addition, the multi-loop controlled power supply may further include a protection module for protecting the power supply from normal operation in the event of input undervoltage, output overvoltage, output overload, and output short circuit.

[0069] It can be seen from the above embodiments that the beneficial effects of the present invention are:

[0070] The present invention provides a multi-loop controlled power supply, which can enable the output voltage of the constant voltage output control loop to adaptively follow the temperature changes of the lithium battery and the chip temperature, thereby improving the operating safety of the power supply and mobile devices; at the same time, the multi-loop controlled power supply provided by the present invention can provide constant voltage and constant current for the load according to the requirements of most fast charging protocols on the market, thereby achieving compatibility with mobile devices of different manufacturers on the market.

[0071] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0072] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0073] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims.

[0074] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A multi-loop controlled power supply, characterized in that: include: Bandgap reference module, linear regulator LDO, fast charging protocol control loop, fast charging protocol interaction processing module, negative temperature coefficient NTC adaptive control loop, temperature adaptive control loop, constant current output control loop and constant voltage output control loop; The bandgap reference module is used to provide a reference voltage for the LDO and a positive temperature coefficient voltage related to the chip temperature for the temperature adaptive control loop; An LDO, under the control of the fast charge protocol interaction processing module, is used to provide a first reference voltage for the constant current output control loop based on a preset fast charge protocol and the reference voltage, provide a second reference voltage for the NTC adaptive control loop and the temperature adaptive control loop based on the reference voltage, and provide a third reference voltage for the fast charge protocol control loop; a temperature adaptive control loop, configured to generate a first difference current based on the positive temperature coefficient voltage and the second reference voltage; An NTC adaptive control loop, configured to generate a second difference current based on the second reference voltage and a negative temperature coefficient voltage related to the battery temperature; a constant current output control loop, configured to generate a third difference current based on the first reference voltage and an actual output current of the power supply; A fast-charge protocol control loop, used to output an adjusted current when the preset constant voltage changes; A constant voltage output control loop is configured to output a preset constant voltage or a preset constant current based on the first difference current, the second difference current, the third difference current, and the adjusted current.

2. The multi-loop controlled power supply according to claim 1, characterized in that: The constant current output control loop includes an output current detection circuit, a filter circuit, a first operational amplifier, a capacitor C1 and a first current mirror unit; wherein, The current detection circuit is configured to sample the output preset constant current and convert it into a first voltage; The filtering circuit is used to filter the first voltage; The first operational amplifier is configured to perform a proportional operation on the filtered first voltage and the first reference voltage; The first current mirror unit is used to replicate the output result of the first operational amplifier according to a preset ratio.

3. The multi-loop controlled power supply according to claim 2, characterized in that: The output current detection circuit includes a second operational amplifier, a chopper operational amplifier, MOS tubes: M1, M2, resistors: R1, R2, R3, R4, an output terminal VoutSP and an output terminal VoutSN; wherein, The output terminal of the second operational amplifier is connected to the gate of M1, the drain of M1 is connected to the output terminal VoutSP via R1, and the source of M1 is grounded via R2. The non-inverting input terminal of the second operational amplifier is connected to the reference voltage, and the inverting input terminal is connected to the source of M1. The output terminal of the chopper operational amplifier is connected to the gate of M2, the drain of M2 is connected to the output terminal VoutSN via R3, and the source of M2 is grounded via R4. The first input terminal of the chopper operational amplifier is connected to the drain of M1, and the second input terminal is connected to the drain of M2.

4. The multi-loop controlled power supply according to claim 3, characterized in that: The filter circuit includes resistors: R6, R7, R8, nodes: N1, N2 and capacitors: C2, C3; wherein, One end of R6 is connected to the source of M2, and the other end is connected to the inverting input terminal of the first operational amplifier through R7 and R8. Node N1 is located between R6 and R7, and node N2 is located between R7 and R8. One end of C2 is connected to node N1 and the other end is grounded. One end of C3 is connected to node N2 and the other end is grounded.

5. The multi-loop controlled power supply according to claim 4, characterized in that: The non-inverting input terminal of the first operational amplifier is connected to the first reference voltage, and the output terminal is connected to the first current mirror unit. The two ends of C1 are respectively connected to the inverting input terminal and output terminal of the second operational amplifier. The first current mirror unit is connected to the feedback module in the constant voltage output control loop.

6. The multi-loop controlled power supply according to claim 5, characterized in that: The constant voltage output control loop further includes: a feedback voltage output port and a constant voltage output port, and the feedback module includes a resistor: R H and R L and node N3; wherein, R H One end is connected to the constant voltage output port, and the other end is connected to the constant voltage output port. L Ground, node N3 is located at R H With R L Node N3 is connected to the feedback voltage output port.

7. The multi-loop controlled power supply according to claim 5, characterized in that: The fast charge protocol control loop includes a third operational amplifier, a MOS tube M3, a second current mirror unit, a resistor R5 and a third current mirror unit; wherein, The output end of the third operational amplifier is connected to the gate of M3, the non-inverting input end is connected to the third reference voltage, and the inverting input end is connected to the source of M3. The source of M3 is grounded through R5. The drain of M3 is connected to the second current mirror unit, the second current mirror unit is connected to the third current mirror unit, and the third current mirror unit is connected to the feedback module.

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