Heavy-load terminal power management system

Abstract

The utility model provides a heavy-load terminal power supply management system, which comprises a power supply input module, a first power supply branch circuit and a second power supply branch circuit which are respectively connected with a power supply input end, and a switching module which is respectively connected with output ends of the first power supply branch circuit and the second power supply branch circuit, the switching module is used for switching the first power supply branch circuit or the second power supply branch circuit to supply power to the heavy-load module, the first power supply branch circuit comprises a charging module, a battery module, a switch module and a battery voltage output module, the input end of the charging module is connected with the output end of the power supply input module, and the output end of the battery module is connected with the switching module. The output end of the charging module is connected with the input end of the battery module, the output end of the battery module is connected with the battery voltage output module through the switch module, the battery voltage output module is connected with the input end of the switching module, and the charging module controls the on-off of the switch module. According to the utility model, the reliability and the safety of equipment are improved.

Description

Technical Field

[0001] This utility model relates to the field of power management technology, specifically to a power management system for large load terminals. Background Technology

[0002] With the development of mobile smart terminals, their functions are becoming more and more numerous, and their battery capacity is becoming larger and larger. Although this has improved the intelligence and battery life of the products, it has also greatly increased the requirements for product charging. It is necessary to not only fast charging, but also to consider the charging requirements of high load. In this case, when the terminal is working under high load and charging at the same time, a large current will inevitably be generated in the main power circuit. At this time, the entire product heats up. In mild cases, it will affect the performance of the product. In severe cases, it may even burn out some components and make the entire product unusable.

[0003] There are currently two main solutions on the market:

[0004] The first method is to raise the input power of the charging chip. Under high load, the current in the main power supply path will be reduced accordingly to ensure product stability. However, high voltage poses a certain overvoltage risk for some charging chips, and chips that support high voltage and high current are generally larger in package size, which places higher demands on PCB layout and routing, and has a certain impact on signal or power integrity.

[0005] The second method is to use multiple charging chips connected in parallel to divide the current. Although this solution can guarantee a large current, it has no advantage in terms of cost and PCB design. Utility Model Content

[0006] To address the problems in the existing technology, this utility model provides a high-load terminal power management system that can achieve high-load operation of products at low cost, while reducing heat loss in the charging circuit and improving product reliability and stability.

[0007] This utility model discloses a high-load terminal power management system, including a power input module, a first power supply branch and a second power supply branch connected to the power input terminal, and a switching module connected to the output terminals of the first and second power supply branches. The power input module outputs a first voltage, and the output terminal of the switching module outputs a system voltage for powering a high-load module. The switching module is used to switch between the first power supply branch and the second power supply branch to power the high-load module.

[0008] The first power supply branch includes a charging module, a battery module, a switch module, and a battery voltage output module. The input terminal of the charging module is connected to the output terminal of the power input module, the output terminal of the charging module is connected to the input terminal of the battery module, the output terminal of the battery module is connected to the battery voltage output module through the switch module, the battery voltage output module is connected to the input terminal of the switching module, and the charging module controls the on / off state of the switch module.

[0009] Furthermore, the power input module is an adapter module, which outputs a first voltage to the first power supply branch and the second power supply branch.

[0010] Furthermore, the switching module includes a first switching unit and a second switching unit. The input terminal of the first switching unit is connected to a first voltage, the output terminal is connected to the input terminal of the large load module, and the control terminal is connected to the first voltage. The input terminal of the second switching unit is connected to the battery voltage output terminal, the output terminal is connected to the input terminal of the large load module, and the control terminal is connected to the first voltage. When there is a first voltage input, the first switching unit is turned on and the second switching unit is turned off. When the first voltage is 0, the first switching unit is turned off and the second switching unit is turned on.

[0011] Further, the first switching unit includes a switching transistor Q20 and an NMOS transistor Q23. The drain (D) of the switching transistor Q20 is connected to a first voltage, and its source (S) is connected to the input terminal of the large load module and to the drain of the NMOS transistor Q23 through a series resistor R27 and a resistor R29. The gate (G) of the switching transistor Q20 is connected between the resistors R27 and R29. The source (S) of the NMOS transistor Q23 is grounded, and the gate (G) of the NMOS transistor Q23 is connected between a series resistor R40 and a resistor R41. The other end of the resistor R40 is connected to the first voltage, and the other end of the resistor R41 is grounded.

[0012] Furthermore, the second switching unit includes a switching transistor Q24, the drain of which is connected to the battery voltage output terminal, the source of which is connected to the input terminal of the large load module, the gate of which is connected to one end of resistor R63 and the first voltage, and the other end of resistor R61 is grounded.

[0013] Furthermore, the charging module includes a first filtering unit, a charging chip U13, a first voltage detection unit, and a battery charging unit. The first filtering unit is located at the output terminal of the power input module. The input terminal of the first voltage detection unit is connected to the output terminal of the filtering unit, and the output terminal of the first voltage detection unit is connected to the detection pin of the charging chip U13. The input terminal of the battery charging unit is connected to the voltage output terminal of the charging chip, and the output terminal of the battery charging unit is connected to the battery module. The module also includes a battery power supply unit. The input terminal of the battery power supply unit is connected to the output terminal of the battery module, and the output terminal of the battery power supply unit is connected to the power pin of the charging chip U13. When the power input module has no power input, the battery power supply unit provides uninterrupted power to the charging chip U13.

[0014] Furthermore, the switching module includes a MOSFET Q33, the gate of the MOSFET Q33 is connected to the control pin of the charging chip U13, the drain of the MOSFET Q33 is connected to the input terminal of the battery voltage output module, and the source of the MOSFET Q33 is connected to the output terminal of the battery module.

[0015] Furthermore, the battery voltage output module includes a second filtering unit and a transient suppression unit for protecting the battery voltage.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This utility model adds a second power supply branch on the basis of the traditional design and switches it through a switching module. The modification is simple and the cost is controllable. Under the premise of external power supply, the voltage of the charging chip only needs to power the battery and does not need to power the subsequent large load module. The large load is powered by the first power supply branch. Through simple current diversion, the heat loss of the charging chip is reduced, the overall temperature is lowered, and the reliability and safety of the equipment are improved. Attached Figure Description

[0017] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a structural block diagram of the present utility model;

[0019] Figure 2 This is a circuit diagram of an embodiment of the second power supply branch of this utility model;

[0020] Figure 3 This is a circuit diagram of an embodiment of the switching module of this utility model. Detailed Implementation

[0021] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order.

[0022] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, the present invention relates to a large load terminal power management system, comprising a power input module, a first power supply branch and a second power supply branch respectively connected to the power input terminal, and a switching module respectively connected to the output terminals of the first power supply branch and the second power supply branch. The power input module outputs a first voltage DC_IN, and the output terminal of the switching module outputs a system voltage VSYS for powering the large load module. The switching module is used to switch between the first power supply branch and the second power supply branch to power the large load module.

[0025] The first power supply branch includes a charging module, a battery module, a switch module, and a battery voltage output module. The input terminal of the charging module is connected to the output terminal of the power input module, the output terminal of the charging module is connected to the input terminal of the battery module, the output terminal of the battery module is connected to the battery voltage output module through the switch module, the battery voltage output module is connected to the input terminal of the switching module, and the charging module controls the on / off state of the switch module.

[0026] Preferably, the power input module in this example is an adapter module, which outputs DC voltage to the first power supply branch and the second power supply branch of the subsequent stage.

[0027] like Figure 3 As shown, the switching module includes a first switching unit on the left and a second switching unit on the right. The input terminal of the first switching unit is connected to the first voltage DC_IN, the output terminal is connected to the input terminal of the large load module, and the control terminal is connected to the first voltage DC_IN. The input terminal of the second switching unit is connected to the output terminal of the battery voltage BAT_VIN, the output terminal is connected to the input terminal of the large load module, and the control terminal is connected to the first voltage DC_IN. When there is a first voltage input, the first switching unit is turned on and the second switching unit is turned off. When the first voltage is 0, that is, when there is no first voltage input, the first switching unit is turned off and the second switching unit is turned on.

[0028] As an embodiment of this utility model, the first switching unit includes a switching transistor Q20 and an NMOS transistor Q23. The drain (D) of the switching transistor Q20 is connected to a first voltage, and the source (S) is connected to the input terminal of the large load module and to the drain of the NMOS transistor Q23 through a series resistor R27 and a resistor R29. The gate (G) of the switching transistor Q20 is connected between the resistors R27 and R29. The source (S) of the NMOS transistor Q23 is grounded, and the gate (G) of the NMOS transistor Q23 is connected between a series resistor R40 and a resistor R41. The other end of the resistor R40 is connected to the first voltage, and the other end of the resistor R41 is grounded.

[0029] The second switching unit includes a switching transistor Q24. The drain of the switching transistor Q24 is connected to the battery voltage output terminal, and the source terminal is connected to the input terminal of the large load module. The gate of the switching transistor Q24 is connected to one end of the resistor R63 and the first voltage, respectively, and the other end of the resistor R61 is grounded.

[0030] The switching module components in this example can be calculated based on their own design parameters, and the selection of each component can be made according to the actual usage requirements. Of course, the first and second switching units in this example are also applicable to other mutually exclusive control switching devices, such as electronic switching chips or automatic switching devices.

[0031] like Figure 1 and Figure 2 As shown, the charging module in this example includes a first filtering unit, a charging chip U13, a first voltage detection unit, and a battery charging unit. The first filtering unit is located at the output terminal of the power input module. The input terminal of the first voltage detection unit is connected to the output terminal of the filtering unit. The output terminal of the first voltage detection unit is connected to the detection pin of the charging chip U13. The input terminal of the battery charging unit is connected to the voltage output terminal of the charging chip. The output terminal of the battery charging unit is connected to the battery module.

[0032] The charging module also includes a battery power supply unit. The input terminal of the battery power supply unit is connected to the output terminal of the battery module, and the output terminal of the battery power supply unit is connected to the power pin 20 of the charging chip U13. When the power input module has no power input, the battery power supply unit provides uninterrupted power to the charging chip U13. In this example, the battery power supply unit includes a diode D38 and a resistor R182 connected in series.

[0033] The first filtering unit in this example consists of several diodes connected in parallel. The first voltage detection unit in this example consists of resistors R179, R184, and R186 connected in series. One end of the series resistors R179, R184, and R186 is connected to the output terminal of the first filtering unit, and the other end is grounded. The detection pin 6 of the charging chip U13 is connected between resistors R179 and R184. The battery charging unit in this example includes a diode D47 connected in series, a capacitor C286, an inductor L25, a resistor R185, and capacitors C289 and C290 connected in parallel at the end of the resistor R185.

[0034] In this example, the switching module includes a MOSFET Q33. The gate (G) of the MOSFET Q33 is connected to the control pin of the charging chip U13, the drain (D) of the MOSFET Q33 is connected to the input terminal of the battery voltage output module, and the source (S) of the MOSFET Q33 is connected to the output terminal of the battery module.

[0035] The battery voltage output module in this example includes a second filtering unit and a transient suppression unit to protect the battery voltage. It provides a stable voltage and protects the battery power supply. The second filtering unit consists of several capacitors connected in parallel. In this example, the first and second filtering units can also be π-type filters, LC filter circuits, etc. The transient suppression unit in this example uses a transient suppression diode D26; alternatively, static protection devices or static protection devices with transient suppression diodes can also be selected.

[0036] The working principle of this example is as follows:

[0037] When DC_IN is connected, the charging chip U13 detects the external power supply through pin 6 (ACDET). At this time, the charging chip U13 pulls pin 11 (BATDRV) low to 0V, thereby controlling MOSFET Q33 to turn off. DC_IN charges the battery through the charging chip U13, and the battery cannot supply power to BAT_VIN. When DC_IN is connected, Q23 is an NMOS transistor. At this time, its Vgs is greater than 0, so NMOS transistor Q23 is turned on. The gate of NMOS transistor Q20 is connected to ground. Since there is a body diode inside the switching transistor Q20, the source of the switching transistor Q20 is approximately equal to DC_IN. In this example, the switching transistor Q20 is a PMOS transistor. At this time, the Vgs of the switching transistor Q20 is less than 0, so the switching transistor Q20 is turned on. At the same time, the source of the switching transistor Q24 is DC_IN, and the gate is also DC_IN. The switching transistor Q24 is turned off. Therefore, DC_IN supplies power to VSYS at this time.

[0038] When there is no DC_IN, pin 6 (ACDET) of charging chip U13 does not detect DC input. At this time, the level of pin 11 (BATDRV) of charging chip U13 is the charging voltage. MOSFET Q33 is an NMOS, and its gate voltage is the charging voltage, which is greater than the battery voltage at the source. Therefore, MOSFET Q33 is turned on, and BAT_VIN is powered by the battery. When there is no DC_IN, the gate of switching transistor Q24 is grounded to 0V. Due to the presence of the body diode in switching transistor Q24, the source of switching transistor Q24 is BAT_VIN. Therefore, Vgs of Q24 is less than 0, and switching transistor Q24 is turned on. So at this time, BAT_VIN powers VSYS. At the same time, since DC_IN is 0V, both the gate and source of NMOS transistor Q23 are 0V, and NMOS transistor Q23 is in the off state. Thus, the gate and source levels of switching transistor Q20 are both VSYS, and switching transistor Q20 is turned off. VSYS cannot flow back to DC_IN, ensuring the safety of the circuit.

[0039] As can be seen from the above, this utility model adds a second power supply branch on the basis of the traditional design and switches it through a switching module. The modification is simple and the cost is controllable. Under the premise of external power supply, the voltage of the charging chip only needs to power the battery and does not need to power the subsequent large load module. The large load is powered by the first power supply branch. Through simple current diversion, the heat loss of the charging chip is reduced, the overall temperature is lowered, and the reliability and safety of the equipment are improved.

[0040] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A large load terminal power management system, characterized by: The system includes a power input module, a first power supply branch and a second power supply branch connected to the power input terminal, and a switching module connected to the output terminals of the first and second power supply branches. The power input module outputs a first voltage, and the switching module outputs a system voltage for powering a large load module. The switching module is used to switch between the first power supply branch and the second power supply branch to power the large load module. The first power supply branch includes a charging module, a battery module, a switch module, and a battery voltage output module. The input terminal of the charging module is connected to the output terminal of the power input module, the output terminal of the charging module is connected to the input terminal of the battery module, the output terminal of the battery module is connected to the battery voltage output module through the switch module, the battery voltage output module is connected to the input terminal of the switching module, and the charging module controls the on / off state of the switch module.

2. The large load terminal power management system of claim 1, wherein: The power input module is an adapter module, which outputs a first voltage to the first power supply branch and the second power supply branch.

3. The large load terminal power management system of claim 2, wherein: The switching module includes a first switching unit and a second switching unit. The input terminal of the first switching unit is connected to a first voltage, the output terminal is connected to the input terminal of the large load module, and the control terminal is connected to the first voltage. The input terminal of the second switching unit is connected to the battery voltage output terminal, the output terminal is connected to the input terminal of the large load module, and the control terminal is connected to the first voltage. When there is a first voltage input, the first switching unit is turned on and the second switching unit is turned off. When the first voltage is 0, the first switching unit is turned off and the second switching unit is turned on.

4. The large load terminal power management system of claim 3, wherein: The first switching unit includes a switching transistor Q20 and an NMOS transistor Q23. The drain (D) of the switching transistor Q20 is connected to a first voltage, and the source (S) is connected to the input terminal of the large load module. The source (S) of the switching transistor Q20 is connected to the drain (D) of the NMOS transistor Q23 through a series resistor R27 and a resistor R29. The gate (G) of the switching transistor Q20 is connected between the resistors R27 and R29. The source (S) of the NMOS transistor Q23 is grounded. The gate (G) of the NMOS transistor Q23 is connected between a series resistor R40 and a resistor R41. The other end of the resistor R40 is connected to the first voltage, and the other end of the resistor R41 is grounded.

5. The large load terminal power management system of claim 3, wherein: The second switching unit includes a switching transistor Q24. The drain of the switching transistor Q24 is connected to the battery voltage output terminal, and the source terminal is connected to the input terminal of the large load module. The gate of the switching transistor Q24 is connected to one end of the resistor R63 and the first voltage, respectively, and the other end of the resistor R61 is grounded.

6. The high-load terminal power management system of any of claims 1-5, wherein: The charging module includes a first filtering unit, a charging chip U13, a first voltage detection unit, and a battery charging unit. The first filtering unit is located at the output terminal of the power input module. The input terminal of the first voltage detection unit is connected to the output terminal of the filtering unit, and the output terminal of the first voltage detection unit is connected to the detection pin of the charging chip U13. The input terminal of the battery charging unit is connected to the voltage output terminal of the charging chip, and the output terminal of the battery charging unit is connected to the battery module. The module also includes a battery power supply unit. The input terminal of the battery power supply unit is connected to the output terminal of the battery module, and the output terminal of the battery power supply unit is connected to the power pin of the charging chip U13. When the power input module has no power input, the battery power supply unit provides uninterrupted power to the charging chip U13.

7. The large load terminal power management system of claim 6, wherein: The switching module includes a MOSFET Q33. The gate (G) of the MOSFET Q33 is connected to the control pin of the charging chip U13, the drain (D) of the MOSFET Q33 is connected to the input terminal of the battery voltage output module, and the source (S) of the MOSFET Q33 is connected to the output terminal of the battery module.

8. The high-load terminal power management system of any of claims 1-5, wherein: The battery voltage output module includes a second filtering unit and a transient suppression unit to protect the battery voltage.

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