Starting-up circuit and electronic equipment

Abstract

The invention discloses a startup circuit and electronic equipment, and belongs to the technical field of terminals. The power-on circuit is characterized in that a first end of a comparator and a first end of a first power conversion circuit are respectively connected with a charging interface, a second end of the comparator and a second end of the first power conversion circuit are respectively connected with a main power supply access, and a first end of a power-on trigger circuit is connected with the second end of the first power conversion circuit; the second end of the startup trigger circuit is connected with the battery voltage detection end of the power management chip, and the third end of the comparator is connected with the third end of the first power conversion circuit and the third end of the startup trigger circuit; and the comparator is used for controlling the first power conversion circuit to supply power to a load connected with the main power supply access when the comparator detects that the input voltage of the charging interface is greater than the voltage of the main power supply access, and controlling the startup trigger circuit to adjust the voltage of the battery voltage detection end to a first voltage, and the first voltage is greater than the startup voltage.

Description

Technical Field

[0001] The present application belongs to the field of terminal technology, and specifically relates to a power-on circuit and an electronic device. Background Art

[0002] Currently, an electronic device can be turned on when the battery power of the electronic device is greater than a preset power threshold.

[0003] At present, the relevant technology can slightly reduce the startup voltage of the electronic device, that is, reduce the preset power threshold, so that the electronic device can be quickly powered on in the low-power automatic shutdown scenario.

[0004] However, lowering the startup voltage may cause the battery of the electronic device to be over-discharged, thereby reducing the battery life. Therefore, how to achieve fast startup of the electronic device without damaging the battery life is an urgent problem to be solved. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a power-on circuit and an electronic device, which can achieve zero battery power startup without affecting the battery life.

[0006] In a first aspect, an embodiment of the present application provides a power-on circuit, which may include: a comparator, a first power conversion circuit, and a power-on trigger circuit; a first end of the comparator and a first end of the first power conversion circuit are respectively connected to a charging interface of an electronic device, a second end of the comparator and a second end of the first power conversion circuit are respectively connected to a main power supply path, a first end of the power-on trigger circuit is connected to a second end of the first power conversion circuit, a second end of the power-on trigger circuit is connected to a battery voltage detection end of a power management chip in the electronic device, and a third end of the comparator is respectively connected to a third end of the first power conversion circuit and a third end of the power-on trigger circuit; wherein the comparator is used to control the first power conversion circuit to supply power to a load connected to the main power supply path when the comparator detects that the input voltage of the charging interface is greater than the voltage of the main power supply path, and to control the power-on trigger circuit to adjust the voltage of the battery voltage detection end to a first voltage, and the first voltage is greater than the power-on voltage of the electronic device.

[0007] In a second aspect, an embodiment of the present application provides an electronic device, which may include a power-on circuit as described in the first aspect.

[0008] In the embodiment of the present application, since the comparator can control the first power conversion circuit to supply power to the load connected to the main power supply path based on the input voltage of the charging interface of the electronic device when it is greater than the voltage of the main power supply path of the electronic device, and control the power-on trigger circuit to adjust the voltage of the battery voltage detection terminal of the power management chip to a first voltage greater than the power-on voltage, when the electronic device is connected to the charger, under the control of the comparator, the power-on trigger circuit can directly adjust the voltage of the voltage detection terminal to above the power-on voltage, thereby triggering the power management chip to start the power-on process, and the first power conversion circuit directly based on the input voltage input from the charging interface, continuously provides the working voltage to the load on the main power supply path. In this way, when the electronic device is connected to the charger, since there is no need to use the battery to provide the working voltage for the load in the electronic device, it will not cause the battery to be over-discharged, thereby improving the battery life under the premise of achieving fast startup. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a possible structural diagram of a power-on circuit provided in an embodiment of the present application;

[0010] Figure 2 This is a possible structural diagram of a power-on circuit provided in an embodiment of the present application;

[0011] Figure 3 This is a possible structural diagram of a power-on circuit provided in an embodiment of the present application;

[0012] Figure 4 This is a possible structural diagram of a power-on circuit provided in an embodiment of the present application;

[0013] Figure 5 This is a possible structural diagram of a power-on circuit provided in an embodiment of the present application;

[0014] Figure 6 This is a possible structural diagram of a power-on circuit provided in an embodiment of the present application;

[0015] Figure 7 This is a possible structural diagram of a power-on circuit provided in an embodiment of the present application;

[0016] Figure 8 It is a possible structural schematic diagram of the power-on circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0018] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0019] The power-on circuit and electronic device provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0020] The power-on circuit and electronic device provided in the embodiments of the present application can be applied to any battery power scenario, such as over-discharge of the battery of the electronic device, shutdown due to zero power, or active shutdown by the user. When the electronic device is charging, no matter how much the battery power is, the electronic device can use the power-on circuit provided in the embodiments of the present application to quickly power on the electronic device.

[0021] The embodiment of the present application provides a power-on circuit. Figure 1 The schematic diagram of the structure of the power-on circuit provided in the embodiment of the present application is shown as follows: Figure 1 As shown, the power-on circuit may include: a comparator 11, a first power conversion circuit 12, and a power-on trigger circuit 13; the first end of the comparator 11 and the first end of the first power conversion circuit 12 are respectively connected to the charging interface 14 of the electronic device, the second end of the comparator 11 and the second end of the first power conversion circuit 12 are respectively connected to the main power supply path 15 of the electronic device, the first end of the power-on trigger circuit 13 is connected to the second end of the first power conversion circuit 12, the second end of the power-on trigger circuit 13 is connected to the battery voltage detection end of the power management chip 16 in the electronic device, and the third end of the comparator 11 is respectively connected to the third end of the first power conversion circuit 12 and the third end of the power-on trigger circuit 13.

[0022] Among them, the comparator 11 can be used to control the first power conversion circuit 12 to supply power to the load connected to the main power supply path 15 based on the input voltage when the comparator 11 detects that the input voltage of the charging interface 14 is greater than the voltage of the main power supply path 15, and control the power-on trigger circuit 13 to adjust the voltage of the battery voltage detection end to a first voltage, and the first voltage is greater than the power-on voltage of the electronic device.

[0023] In some embodiments of the present application, the comparator may include 5 terminals, namely, a non-inverting input terminal, a reverse input terminal, a positive power supply terminal, a negative power supply terminal, and an output terminal. Among them, the first terminal of the comparator may be the non-inverting input terminal of the comparator, the second terminal of the comparator may be the reverse input terminal, the third terminal of the comparator may be the output terminal of the comparator, the fourth terminal of the comparator may be the positive power supply terminal of the comparator, and the fifth terminal of the comparator may be the negative power supply terminal of the comparator.

[0024] It should be noted that the working principle of the comparator is: when the data input to the same-direction input terminal is greater than the data input to the reverse input terminal, the comparator outputs the voltage of the positive power supply terminal of the comparator. Therefore, when the input voltage of the charging interface is greater than the voltage of the main power supply path, the comparator outputs a high level, for example, the high level can be the input voltage of the charging interface or the input voltage of the charging interface + the voltage offset value. The first power conversion circuit can be connected to the main power supply path and the charging interface under the action of the high level; and the power-on trigger circuit can be connected to the battery voltage detection terminal of the first power supply path under the action of the high level.

[0025] It can be understood that the output voltage of the above-mentioned first power conversion circuit is lower than the input voltage of the charging interface, that is, the first power conversion circuit can perform a certain voltage drop on the input voltage of the charging interface, and then output the voltage after the voltage drop to the main power supply path. For example, the voltage drop amplitude of the first power conversion circuit can be designed according to the power demand of the main power supply path. In this way, during the charging process of the electronic device, the input voltage of the charging interface is continuously greater than the voltage of the main power supply path, so that the first power conversion circuit is continuously used to power the main power supply path.

[0026] In some embodiments of the present application, the above-mentioned step-down circuit may be a BUCK circuit or a charge pump circuit with a step-down function, which may be specifically determined according to actual usage requirements.

[0027] In some embodiments of the present application, the power-on trigger circuit can increase the voltage of the battery voltage detection terminal based on the output voltage of the first power conversion circuit.

[0028] It can be understood that in current mobile electronic devices, almost all power loads of the electronic devices are powered by the main power supply path. Therefore, after the main power supply path is powered by the first power conversion circuit, the user can use most functions of the electronic device after it is turned on.

[0029] Of course, if the electronic device includes loads directly powered by batteries, hereinafter referred to as direct supply loads, these direct supply loads will not be started when the above-mentioned startup method is used for startup. Of course, in actual implementation, the first power conversion circuit can be connected to each direct supply load to power these direct supply loads.

[0030] In some embodiments of the present application, Figure 1 ,like Figure 2 As shown, the first power conversion circuit 12 may include: a buck circuit 121 and a first switch tube 122. The first end of the first switch tube 122 is connected to the charging interface 14, the second end of the first switch tube 122 is connected to the first end of the buck circuit 121, the third end of the first switch tube 122 is connected to the third end of the comparator 11, and the second end of the buck circuit 121 is connected to the main power supply path 15. Among them, the comparator 11 can be specifically used to control the first switch tube 122 to be turned on when the voltage of the charging interface 14 is greater than the voltage of the main power supply path 15, so as to control the buck circuit 121 to supply power to the load connected to the main power supply path 15 based on the input voltage.

[0031] In some embodiments of the present application, the first switch tube may be a MOS tube.

[0032] The first switch tube may be an N-type MOS tube or a P-type MOS tube.

[0033] For example, taking the first switch tube as an N-type MOS tube, Figure 8 As shown, the first end, the second end and the third end of the first switch tube 122 are respectively: the source (source, S), the drain (drain, D) and the gate (G) of the MOS tube.

[0034] In some embodiments of the present application, the first switch tube may also be a triode or a field effect tube, etc., which may be determined according to actual usage requirements.

[0035] It can be understood that when the third terminal of the comparator outputs a high level, the first switch tube can be triggered to turn on, so that the external power supply can supply power to the load on the main power supply path through the step-down circuit.

[0036] In this way, since the first switch tube is respectively connected to the charging interface and the step-down circuit, and the control end of the first switch tube is connected to the third end of the comparator, when the input voltage of the charging interface is greater than the voltage of the main power supply path, the first switch tube can be turned on under the control of the comparator, so that the step-down circuit is turned on with the charging interface, and then the step-down circuit can supply power to the load on the main power supply path based on the input voltage of the charging interface.

[0037] In some embodiments of the present application, since the battery voltage detection terminal is connected to a battery in the electronic device, the power-on trigger circuit can also charge the battery based on the output voltage of the first power conversion circuit.

[0038] In order to prevent the battery from being damaged by a large current during the trickle charging stage, the power-on trigger circuit may limit the output current of the first power conversion circuit.

[0039] In some embodiments of the present application, Figure 1 ,like Figure 3 As shown, the power-on trigger circuit 13 may include: a current limiting circuit 131 and a second switch tube 132. The first end of the second switch tube 132 is connected to the second end of the first power conversion circuit 12, the second end of the second switch tube 132 is connected to the first end of the current limiting circuit 131, the second end of the current limiting circuit 131 is connected to the battery voltage detection end of the power management module 16, and the third end of the second switch tube 132 is connected to the third end of the comparator 11. The comparator 11 can be specifically used to control the second switch tube 132 to conduct when the voltage of the charging interface 14 is greater than the voltage of the main power supply path 15, so as to control the current limiting circuit 131 to adjust the voltage of the battery voltage detection end of the power management module 16 to the first voltage.

[0040] It can be understood that when the third terminal of the comparator outputs a high level, it can trigger the second switch tube to turn on, so that the power-on trigger circuit is turned on with the first power conversion circuit, so that the power-on trigger circuit can pull the voltage of the battery voltage detection terminal to the first voltage based on the output voltage of the first power conversion circuit.

[0041] In some embodiments of the present application, when there is no backflow prevention design in the current limiting circuit, the second switch tube can be an anti-backflow switch tube to prevent the battery voltage from backflowing into the main power supply path through the power-on trigger circuit when the battery power of the electronic device is high, so as to protect the load connected to the main power supply path.

[0042] In some embodiments of the present application, the second switch tube may be a MOS tube.

[0043] For example, the second switch tube is an N-type MOS tube, a P-type MOS tube, or can be a back-to-back MOS tube (ie, an anti-backflow MOS tube) composed of an N-type MOS tube and a P-type MOS tube.

[0044] In this way, since the second switch tube can be an anti-backflow switch tube, it can prevent the battery voltage from backflowing into the main power supply path through the current limiting circuit, thereby protecting the load connected to the main power supply path.

[0045] In some embodiments of the present application, the number of batteries in the electronic device is different, and the above-mentioned current limiting circuit may be different.

[0046] In some embodiments of the present application, Figure 3 ,like Figure 4 As shown, the second end of the current limiting circuit 131 is also connected to the battery 19 of the electronic device;

[0047] When the battery includes one cell, the current limiting circuit 131 may be a step-down current limiting circuit. When the battery includes multiple cells, the current limiting circuit 131 may be a step-up current limiting circuit.

[0048] In this way, since the second end of the current limiting circuit is also connected to the battery of the electronic device, and when the battery includes one battery cell, the step-down current limiting circuit is used to raise the voltage of the battery voltage detection terminal of the power management chip; when the battery includes multiple batteries, the step-up current limiting circuit is used to raise the voltage of the battery voltage detection terminal of the power management chip, so that the power-on trigger circuit can charge the battery stably and reliably through the power-on trigger circuit on the basis of raising the voltage of the battery voltage detection terminal, specifically, the safety of the battery in the trickle and pre-charging stages can be guaranteed. When the battery voltage detection terminal is pulled to the power-on voltage, the battery can be safely charged with a small current controllable.

[0049] In some embodiments of the present application, when the power-on trigger circuit includes a boost current limiting circuit, the second switch tube may be a conventional MOS tube, and of course, may also be an anti-backflow switch tube.

[0050] In this way, since the current limiting circuit in the power-on trigger circuit can be designed differently according to the number of batteries in the electronic device, the battery in the electronic device can be charged more reasonably through the power-on trigger circuit on the basis of raising the voltage of the battery voltage detection terminal of the power management chip through the power-on trigger circuit.

[0051] In some embodiments of the present application, Figure 1 ,like Figure 5As shown, the power-on circuit 10 may further include: a third switch tube 17. A first end of the third switch tube 17 is connected to a third end of the comparator 11, a second end of the second switch tube 17 is grounded, and a third end of the third switch tube 17 is connected to a first end 18 of a processor of the electronic device.

[0052] Among them, the conduction and disconnection of the third switch tube 17 are controlled by the processor; when the third switch tube 17 is turned on, the first power conversion circuit 12 is disconnected from the main power supply path 15, and the power-on trigger circuit 13 is disconnected from the main power supply path 15.

[0053] It can be understood that when the third switch is turned on, it is equivalent to the third terminal of the comparator being grounded, so that the voltage values ​​of the third terminal of the first switch and the third terminal of the second switch are low level, such as 0V, so that the first switch and the second switch are disconnected. In this way, the buck circuit is disconnected from the charging interface, and the buck circuit stops supplying power to the load connected to the main power supply path; and the current limiting circuit is disconnected from the battery voltage detection terminal, so as to prevent the battery voltage from flowing back to the main power supply path.

[0054] In some embodiments of the present application, the third switch tube may be a triode.

[0055] For example, the third switch tube may be an N-type transistor or a P-type transistor.

[0056] In some embodiments of the present application, the first end, the second end and the third end of the third switch tube are respectively a collector, an emitter and a base.

[0057] In some embodiments of the present application, Figure 7 As shown, the third terminal of the third switch tube 17 can be grounded through the resistor R1.

[0058] In some embodiments of the present application, the first end of the processor may be a general-purpose input / output (GPIO) end of the processor.

[0059] In some embodiments of the present application, when the electronic device meets the battery power supply condition, the processor can output a control signal through the first end of the processor to control the third switch tube to turn on, thereby grounding the third end of the comparator.

[0060] For example, assuming that the third switch tube is an N-type transistor, Figure 8 As described above, the first terminal GPIO of the processor can output a high level to control the collector and emitter of the third switch tube 17 to be turned on, thereby achieving the grounding of the third terminal of the comparator.

[0061] Of course, when the third switch tube is a P-type transistor, the first terminal of the processor outputs a low level to control the third switch tube to be turned on, thereby achieving the grounding of the third terminal of the comparator.

[0062] In some embodiments of the present application, the battery power supply condition may include at least one of the following:

[0063] The battery power of the electronic device is greater than or equal to the preset power;

[0064] The charging time of the electronic device is greater than or equal to the preset time;

[0065] The connection time between the charging port and the charger is greater than or equal to the preset time.

[0066] It is understandable that the above processor may be a central processing unit of an electronic device.

[0067] In this way, since the first end of the third switch tube is connected to the third end of the comparator, the second end of the third switch tube is grounded, and the second end of the third switch tube is connected to the first end of the processor, when the electronic device needs to switch back to battery power, the third switch tube can be controlled to turn on by the processor to make the third end of the comparator grounded, thereby interrupting the power supply through the first power conversion circuit, and avoiding the battery voltage from flowing back through the power-on trigger circuit, thereby increasing the life of the electronic device.

[0068] In some embodiments of the present application, the third switch tube is turned on when the charging time of the electronic device reaches a preset time. It can be understood that the value of the preset time is determined by the charging speed of the electronic device.

[0069] In some embodiments of the present application, the power management chip can record the charging time of the electronic device, so that when the charging time reaches a preset time, the processor of the electronic device can output a control signal through the first end of the processor to control the conduction of the third switch tube to achieve grounding of the output end of the comparator.

[0070] In this way, since the third switch tube can be turned on when the charging time of the electronic device reaches a preset time, thereby disconnecting the direct power supply path between the charging interface and the main power supply path, compared with the solution of setting a complex circuit at the battery voltage detection end of the power management chip to separately disconnect the connection between the battery voltage detection end and the main power supply path, the circuit design of setting the third switch tube is simpler and has fewer additional components.

[0071] In some embodiments of the present application, Figure 1 ,like Figure 6As shown, the power-on circuit 10 may further include a second power conversion circuit 21. A first end of the second power conversion circuit 21 is connected to the charging interface 14, and a second end of the second power conversion circuit 21 is connected to a fourth end of the comparator 11. The second power conversion circuit 21 may be used to provide an operating voltage for the comparator 11.

[0072] It can be understood that the second power conversion circuit can be any circuit that can provide an operating voltage for the comparator.

[0073] In some embodiments of the present application, Figure 6 ,like Figure 7 As shown, the second power conversion circuit 21 may be a boost circuit, and the fifth terminal of the comparator 11 is connected to the charging interface 14 .

[0074] In some embodiments of the present application, the second power conversion circuit may be a charge pump circuit.

[0075] For example, when the second power conversion circuit is a charge pump circuit, Figure 8 As shown, a first terminal of the second power conversion circuit 21 is connected to the charging interface VBUS, a second terminal of the second power conversion circuit 21 is connected to a fourth terminal of the comparator 11, and a third terminal of the second power conversion circuit 21 is grounded.

[0076] In some embodiments of the present application, the output voltage of the second end of the second power conversion circuit can be: VBUS+preset voltage, so that the second power conversion circuit can provide a stable operating voltage for the comparator, and can ensure that when the input voltage of the charging interface VBUS is greater than the voltage of the main power supply path, the comparator can control the first switch tube to turn on.

[0077] For example, the preset voltage may be 5V, 2.7V or any other voltage that can drive the first switch tube to conduct.

[0078] In the above embodiment, the second power conversion circuit is illustrated as a boost circuit. In actual implementation, the second power conversion circuit can also be a buck circuit, wherein the fifth terminal of the comparator can be grounded. That is, by grounding the negative power terminal of the comparator, a stable voltage difference is formed between the positive power terminal and the negative power terminal of the comparator.

[0079] In this way, since the second power conversion circuit can be a boost circuit and the fifth terminal of the comparator is grounded, the second power conversion circuit can provide a stable operating voltage for the comparator.

[0080] It should be noted that, in the above embodiment, the power-on trigger circuit and the first power conversion circuit share a third switch tube. Figure 8The transistor Q5 in FIG. 1 is used as an example for illustration. In actual implementation, a transistor for turning off the second switch tube can be specially provided for the power-on trigger circuit, for example Figure 8 The transistor Q6 or the transistor Q7 in the circuit. The third ends of the transistor Q6 and the transistor Q7 are grounded through the resistor R2 and the resistor R3 respectively.

[0081] also, Figure 8 The resistance values ​​of R1, R2 and R3 can be 10KΩ, the resistance values ​​of R4, R5 and R6 can be 1KΩ, and the resistance values ​​of R7 and R8 can be 100Ω.

[0082] In this way, since a second power conversion circuit can be set up to provide the comparator with an operating voltage directly through an external power supply without using the battery of the electronic device to provide the comparator with an operating voltage, it is ensured that the comparator can start working after the charging interface is connected to the external power supply, thereby improving the working stability of the startup circuit.

[0083] In some embodiments of the present application, when the charging interface VBUS is connected to an external power supply, the power management chip can detect whether the charger is matched. If the charger is a standard charger, the power management chip can start the power-on process after the voltage detected at the battery voltage detection end is greater than the power-on voltage. Otherwise, the power management chip will not start the power-on process to protect the components in the electronic device from being damaged.

[0084] In some embodiments of the present application, since the comparator, the power management chip and the load connected to the main power supply path do not need to be powered by a battery, the electronic device can be directly powered on using the above-mentioned power-on circuit under any battery power status.

[0085] For example, in scenarios where the battery voltage is lower than the power-on voltage, or the battery is over-discharged and shuts down for self-protection, the electronic device can be turned on directly.

[0086] The complete circuit diagram of the power-on circuit provided in the embodiment of the present application is described below in conjunction with the accompanying drawings.

[0087] For example, Figure 8As shown, the power-on circuit provided in the embodiment of the present application may include: a comparator 11, a first switch tube 122, a step-down circuit 121, a current limiting circuit 131, a second switch tube 132, a transistor Q5, i.e., the third switch tube in the above embodiment, and a second power conversion circuit 21; the same-direction input terminal of the comparator 11 is connected to VBUS, i.e., the charging interface 14 in the above embodiment, the reverse input terminal of the comparator 11 is connected to VPH_PWR, i.e., the main power supply path 15 in the above embodiment, the output terminal of the comparator 11 is respectively connected to the third terminal of the first switch tube 122 and the third terminal of the second switch tube 132, the positive power supply terminal of the comparator 11 is connected to the second terminal of the charge pump circuit 21, the negative power supply terminal of the comparator 11 is grounded, and the The first end of the charge pump circuit 21 is connected to VBUS; the first end of the first switch tube 122 is connected to VBUS, the second end of the first switch tube 122 is connected to the first end of the buck circuit 121, and the second end of the buck circuit 121 is respectively connected to VPH_PWR and the first end of the second switch tube 132; the second end of the second switch tube 132 is connected to the first end of the current limiting circuit 131; the second end of the current limiting circuit 131 is connected to VBATS of the power management chip, that is, the battery voltage detection end in the above embodiment; the first end of the transistor Q5, that is, the third switch tube in the above embodiment, is connected to the output end of the comparator 11, the second end of the transistor Q5 is grounded, and the third end of the transistor Q5 is connected to the first end GPIO of the processor.

[0088] The step-down circuit may be a BUCK circuit.

[0089] from Figure 8 It can be seen that the power management chip 16 is connected to VBUS to obtain the working voltage of the power management chip.

[0090] Combination Figure 8 As shown, after VBUS is connected to the external power supply, the second end of the charge pump circuit 21 can output the Vcomparer+ voltage, and the comparator can determine the voltage state between VBUS and VPH_PWR. If the voltage of VBUS is higher than the system voltage VPH_PWR, the Vswitch output by the third end of the comparator is a high level, that is, VBUS+5V. Therefore, if the battery of the electronic device is a single-cell battery, the second switch tube composed of MOS tubes Q2 and Q3, and the first switch tube Q1 are turned on under the action of Vswitch; if the battery of the electronic device includes a dual-cell battery, the second switch tube represented by Q4 and the first switch tube represented by Q1 are turned on under the action of Vswitch.

[0091] from Figure 8 It can be seen that the step-down circuit 121 is a buck circuit, and the step-down circuit 121 is connected to VPH_PWR and VBUS through the first switch tube.

[0092] In some embodiments, the step-down circuit can convert the VBUS voltage, such as 5.0V, into a voltage slightly higher than the power-on voltage. For example, assuming that the power-on voltage of the electronic device is 3.0V, the step-down circuit 121 can convert the VBUS voltage into 3.1V, so that the power management chip can be tricked into starting up through the current limiting circuit while supplying power to each load in the main power supply path.

[0093] In some embodiments of the present application, after the electronic device is turned on, the processor can control the first switch tube to be disconnected through the transistor Q5 when the charging time of the electronic device reaches a preset time, so that the electronic device switches back to battery power supply.

[0094] from Figure 8 It can be seen that VPH_PWR is connected to VBATS through the current limiting circuit 131 and the second switch tube 132, so that the voltage of the battery voltage detection terminal of the power management chip (Power Management Integrated Circuit, PMIC) is raised to the power-on voltage or above the power-on voltage through the current limiting circuit 131 to deceive the PMIC to turn on directly.

[0095] In some embodiments of the present application, Figure 8 As shown, the charging control terminal (CHG_QONB) of the power management chip is connected to the start-up enable terminal (PWRKEY) of the boot chip in the electronic device, and is connected to the positive electrode of the power switch (PWR_KEY) in the electronic device; the charging status indication terminal (CHRDETB) of the boot chip is connected to the CHRDETB terminal of the power management chip, and the negative electrode of the power switch is grounded;

[0096] Among them, the startup chip can start the system of the electronic device when receiving the charging startup trigger signal sent by the power management chip through the CHRDETB terminal, thereby realizing the startup of the electronic device.

[0097] It is understandable that the user can manually trigger the electronic device to turn on by inputting the power switch.

[0098] In some embodiments of the present application, the power switch may be connected to the charging control terminal of the power management chip via a resistor R4. For example, the resistance value of R4 may be 1 kΩ.

[0099] It should be noted that for Figure 8 For symbols and logos in , please refer to the relevant technology. Figure 8 For other terminals, symbols and logos related to the power management chip, please refer to the relevant description of the MT6379 chip in the relevant technology; for other contents related to the boot chip, please refer to the relevant description of the MT6363 chip including the logic chip U1101 in the relevant technology.

[0100] Combine the following Figure 8 The working process of the power-on circuit provided in the embodiment of the present application is described with reference to the specific power-on scenario.

[0101] For example, in combination Figure 8 , assuming that the battery 19 includes 1 cell, then:

[0102] Scenario 1, single cell + battery over-discharge or zero power shutdown: The shutdown is caused by battery over-discharge or zero power. Therefore, after the charging interface VBUS is plugged into the charger, the processor (Adjunct Processor, AP) is not powered on, the GPIO of the AP is floating, and the output voltage Vswitch at the output end of the comparator is high, so that Q1, Q2 and Q3 are turned on, and the output voltage of the buck circuit 121 pulls up the voltage of the detection pin VBATS through Q2, Q3 and the buck current limiting circuit 131, which can deceive the PMIC to start up; and the buck circuit 121 can provide an operating voltage for the load connected to VPH_PWR, and the buck current limiting circuit 131 can trickle charge the battery 19.

[0103] Scenario 2, single cell + active shutdown: After the charger is plugged into the charging port VBUS, the AP can be started because the battery power is greater than or equal to the startup voltage. During the AP startup process, VPH_PWR will be briefly connected to the VBATS of the PMIC through the step-down current limiting circuit 131. After the AP is started, since the battery voltage is greater than VPH_PWR, the AP can control Q1, Q2 and Q3 to disconnect through GPIO, so that the electronic device can resume normal charging and power supply logic.

[0104] For example, in combination Figure 8 , assuming that the battery of the electronic device includes dual cells, then:

[0105] Scenario 3, dual-cell + battery over-discharge or zero-power shutdown: The shutdown is caused by battery over-discharge or zero power. Therefore, after the charger is plugged into the charging interface VBUS, the AP is not powered on, so the AP's GPIO is floating. The output voltage Vswitch at the output end of the comparator is high, so Q1 and Q4 are turned on, and the output voltage of the buck circuit 121 pulls up the voltage of VBATS through Q4 and the boost current limiting circuit 131, deceiving the PMIC to turn on; and the buck circuit 121 can provide operating voltage for the load connected to VPH_PWR, and charge the battery 19 including the dual-cell through Q4 and the boost current limiting circuit 131.

[0106] Scenario 4, dual-cell + active shutdown: After the charger is plugged into the charging interface VBUS, the AP can be started because the battery power is greater than or equal to the startup voltage. During the AP startup process, VPH_PWR will be briefly connected to the VBATS of the PMIC through the boost current limiting circuit 131. After the AP is started, since the battery voltage is greater than VPH_PWR, the AP can control Q1 and Q4 to disconnect through GPIO, so that the electronic device can resume normal charging and power supply logic.

[0107] It can be understood that the above scenarios 1 to 4 may be that the electronic device is connected to an external power supply via a standard charger.

[0108] The following is an explanation of the working process of the power-on circuit when an electronic device is connected to an external power supply via a non-standard charger.

[0109] For example, in combination Figure 8 , taking the charging port connected to a non-standard high-power charger or on-board charger with a dedicated charging port (DCP) as an example, then:

[0110] Scenario 5: High-power or weak-load non-standard charger + battery over-discharge or zero-power shutdown: (1) After the charging interface VBUS is connected to the weak-load charger, before the PMIC starts, if the VBUS voltage is low, such as lower than the turn-on voltage of Q1, and VPH_PWR cannot maintain a voltage greater than the start-up voltage, Q1 remains disconnected. Since Q1 is disconnected, the external power supply does not damage the load connected to VPH_PWR.

[0111] (2) When the charging port is connected to a high-power non-standard charger, if the output voltage VBUS of the charger is greater than VPH_PWR, and the voltage of VBUS is greater than the turn-on voltage of Q1, the comparator can output the voltage of VBUS, causing Q1 to turn on, thereby raising the voltage of VBATS of the PMIC. However, the PMIC can first detect whether the charger is a standard charger before turning on the power. If the detection result indicates that the connected charger is a non-standard charger, the PMIC may not start the power-on process; or, the PMIC may start the power-on process as usual, and after the AP is started, the AP can control Q1 to disconnect through GPIO to shut down the electronic device again. It should be noted that after the AP controls Q1 to disconnect, the PMIC will no longer start the power-on process within the preset time to avoid repeated power-on and power-off of the electronic device.

[0112] Scenario 6: High-power or weak-load non-standard charger actively shuts down: Since the battery power is sufficient, the PMIC is in the on-duty state and can directly detect whether the charger is a standard charger. If the PMIC detects that the connected charger is a non-standard charger, after the PMIC starts the boot process and after the AP starts, the AP can control Q1 to disconnect through GPIO to enable the electronic device to use the existing power supply and charging logic.

[0113] In some embodiments of the present application, during the process of powering the device through an external power supply and a first power supply path, a power indicator displayed on a display screen of the electronic device indicates that the battery power is 1%, so as to remind the user that the battery power is low and avoid the user from unplugging the charger. At the same time, it is convenient for the user to directly switch to battery power supply after the battery is charged to the power-on voltage.

[0114] It can be understood that in the power-on circuit provided in the embodiment of the present application, the high-power output capability of the standard charger can be utilized. In the case of battery over-discharge, a first power conversion circuit is added to directly power the load connected to VPH_PWR with the voltage of VBUS, and the voltage of the battery voltage detection terminal of the power control chip is increased, thereby deceiving the PMIC to start the power-on process. While achieving the power-on, the output voltage of the first power conversion circuit is used to power the load connected to VPH_PWR, so that the electronic device can be quickly powered on.

[0115] It should be noted that Figure 8 If there is no black origin between the two intersecting lines, it means that the lines corresponding to the two lines are independent of each other and there is no signal interaction between the two lines.

[0116] It can be understood that due to the implementation of the low-voltage shutdown solution, all power devices (Power Amplifier, PA) of the new project are currently powered by VPH_PWR, that is, electronic devices such as mobile phones no longer have power amplifiers directly supplied by the battery Vbat. Therefore, as long as the power output of the standard charger is sufficient, the PMIC can be deceived to start the power-on process, so that the user can use all the functions of the electronic device. And after the electronic device is deceived to start, the power-on circuit can trickle charge the battery. After the battery voltage reaches near the output voltage of the first power conversion circuit, the processor can control the first power conversion circuit to disconnect, so that the electronic device can restore the existing charging and power supply logic.

[0117] The present application embodiment provides an electronic device, which may include the above Figures 1 to 8 The power-on circuit shown.

[0118] In the electronic device provided in the embodiment of the present application, since the comparator can control the first power conversion circuit to supply power to the load connected to the main power supply path based on the input voltage of the charging interface of the electronic device when it is greater than the voltage of the main power supply path of the electronic device, and control the power-on trigger circuit to adjust the voltage of the battery voltage detection terminal of the power management chip to a first voltage greater than the power-on voltage, when the electronic device is connected to the charger, under the control of the comparator, the power-on trigger circuit can directly adjust the voltage of the voltage detection terminal to above the power-on voltage, thereby triggering the power management chip to start the power-on process, and the first power conversion circuit directly based on the input voltage input from the charging interface, continuously provides the working voltage to the load on the main power supply path. In this way, when the electronic device is connected to the charger, since there is no need to use the battery to provide the working voltage for the load in the electronic device, it will not cause the battery to be over-discharged, thereby improving the battery life under the premise of achieving fast startup.

[0119] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0120] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A power-on circuit, characterized in that: include: A comparator, a first power conversion circuit, and a power-on trigger circuit; The first end of the comparator and the first end of the first power conversion circuit are respectively connected to the charging interface of the electronic device, the second end of the comparator and the second end of the first power conversion circuit are respectively connected to the main power supply path of the electronic device, the first end of the power-on trigger circuit is connected to the second end of the first power conversion circuit, the second end of the power-on trigger circuit is connected to the battery voltage detection end of the power management chip in the electronic device, and the third end of the comparator is respectively connected to the third end of the first power conversion circuit and the third end of the power-on trigger circuit; Wherein, the comparator is used to control the first power conversion circuit to supply power to the load connected to the main power supply path based on the input voltage when the comparator detects that the input voltage of the charging interface is greater than the voltage of the main power supply path, and control the power-on trigger circuit to adjust the voltage of the battery voltage detection end to a first voltage, and the first voltage is greater than the power-on voltage of the electronic device.

2. The power-on circuit according to claim 1, characterized in that: The first power conversion circuit includes: a step-down circuit and a first switch tube; The first end of the first switch tube is connected to the charging interface, the second end of the first switch tube is connected to the first end of the buck circuit, the third end of the first switch tube is connected to the third end of the comparator, and the second end of the buck circuit is connected to the main power supply path; Among them, the comparator is specifically used to control the first switch tube to turn on when the voltage of the charging interface is greater than the voltage of the main power supply path, so as to control the buck circuit to supply power to the load connected to the main power supply path based on the input voltage.

3. The power-on circuit according to claim 1, characterized in that: The power-on trigger circuit comprises: a current limiting circuit and a second switch tube; The first end of the second switch tube is connected to the second end of the first power conversion circuit, the second end of the second switch tube is connected to the first end of the current limiting circuit, the second end of the current limiting circuit is connected to the battery voltage detection end, and the third end of the second switch tube is connected to the third end of the comparator; The comparator is specifically used to control the second switch tube to conduct when the voltage of the charging interface is greater than the voltage of the main power supply path, so as to control the current limiting circuit to adjust the voltage of the battery voltage detection terminal to the first voltage.

4. The power-on circuit according to claim 3, characterized in that: The second end of the current limiting circuit is also connected to the battery of the electronic device; Wherein, when the battery includes one battery cell, the current limiting circuit is a step-down current limiting circuit; When the battery includes a plurality of cells, the current limiting circuit is a boost current limiting circuit.

5. The power-on circuit according to claim 3 or 4, characterized in that: The second switch tube is an anti-backfeed switch tube.

6. The power-on circuit according to any one of claims 1 to 4, characterized in that: The power-on circuit further includes a third switch tube; The first end of the third switch tube is connected to the third end of the comparator, the second end of the third switch tube is grounded, and the third end of the third switch tube is connected to the first end of the processor of the electronic device; Wherein, the on and off of the third switch tube is controlled by the processor; When the third switch tube is turned on, the first power conversion circuit is disconnected from the main power supply path, and the power-on trigger circuit is disconnected from the main power supply path.

7. The power-on circuit according to any one of claims 1 to 4, characterized in that: The turn-on timing of the third switch tube is: the charging time of the electronic device reaches a preset time.

8. The power-on circuit according to claim 1, characterized in that: The power-on circuit also includes a second power conversion circuit; A first terminal of the second power conversion circuit is connected to the charging interface, and a second terminal of the second power conversion circuit is connected to a fourth terminal of the comparator; The second power conversion circuit is used to provide an operating voltage for the comparator.

9. The power-on circuit according to claim 8, characterized in that: The second power conversion circuit is a boost circuit, and the fifth end of the comparator is connected to the charging interface.

10. An electronic device, characterized in that: The invention comprises a power-on circuit as claimed in any one of claims 1 to 9.

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