Hybrid mode charging circuit, system and charging method

Abstract

The present invention discloses a hybrid mode charging circuit, system and charging method. The hybrid mode charging circuit includes a power conversion module and an output module, which is compatible with non-paired adapters and paired adapters, and can realize pre-charging / constant current charging / constant voltage charging. When working in different working modes, all or part of the switch tubes in the power conversion module are reused for power conversion, and when working in the second working mode, two channels work in the same phase, which can save devices, save costs, reduce solution area, facilitate integration, and maintain high efficiency. When working in the first working mode, each switch branch works in a staggered phase to reduce ripple and improve efficiency.

Description

Technical Field

[0001] The present invention relates to the field of power electronics, and more specifically, to a hybrid mode charging circuit, system and charging method. Background Art

[0002] As the battery capacity of portable devices, especially smartphones, continues to grow, chargers have evolved from the original linear chargers to step-down switching chargers, charge pump chargers, and even three-level chargers. Currently, step-down switching chargers and charge pump chargers are the most common on the market. The step-down charger only needs to add a feedback loop and adjust the duty cycle to easily achieve the stable output current or voltage required for battery charging, so this type of charger has quite good compatibility and can support a variety of power sources. Although the efficiency of the step-down switching charger is significantly higher than that of the linear charging chip, the efficiency usually drops sharply when the input voltage of the step-down charger is much higher than the battery voltage. And the step-down charger requires an inductor as part of the normal operation of the filter, which increases the cost and increases the size of the solution.

[0003] In order to achieve higher efficiency, the industry has developed a switched capacitor (charge pump) charger, which has very high conversion efficiency at a fixed voltage ratio, so as to achieve fast charging in portable devices with limited temperature rise. However, since the input power supply and battery voltage cannot maintain a fixed ratio during the charging process, the charge pump cannot usually be used as a battery charger independently. Usually, if a certified adjustable adapter is connected, the microcontroller is used to monitor the battery voltage and adjust the voltage of the input source (such as the adapter) to achieve battery charging operation. If an uncertified or non-adjustable adapter is connected, the charge pump charger cannot charge.

[0004] Figure 1 It is a typical switched capacitor charging system in the prior art. In order to be compatible with non-paired adapters and realize pre-charging / constant current charging / constant voltage charging, a traditional buck charger needs to be added. Therefore, the solution has two relatively independent control systems and two sets of peripheral devices. It has the disadvantages of high cost, large solution area, and low charging efficiency for non-paired adapter fast charging (charged by a buck charger at high voltage such as 9V input).

[0005] Therefore, how to propose a charging circuit that is compatible with non-paired adapters and can realize trickle charging / pre-charging / constant voltage charging modes, and can reduce system components, reduce costs, and is suitable for integration has become one of the urgent problems to be solved by people in this field. Summary of the invention

[0006] In view of this, the present invention proposes a charging circuit, system and charging method that are compatible with non-paired adapters and can realize trickle charging / pre-charging / constant voltage charging, and can reduce system components and reduce costs, so as to solve the technical problems of large size and low charging efficiency of the power management system in the prior art.

[0007] In a first aspect, an embodiment of the present invention provides a hybrid mode charging circuit, the hybrid mode charging circuit comprising a power conversion module and an output module;

[0008] The power conversion module supports at least two working modes: a first working mode and a second working mode; and in the first working mode and the second working mode, all or part of the switch tubes in the power conversion module are reused to perform power conversion;

[0009] When the power conversion module operates in the first working mode, the ratio of the input voltage to the output voltage of the power conversion module is fixed; when the power conversion module operates in the second working mode, the output signal of the power conversion module is adjusted according to the conduction time ratio of the switch tube in the power conversion module;

[0010] In different working modes, the positions of the output signals of the power conversion module are different, and by switching different paths in the output module, the power conversion module charges the battery through different paths.

[0011] Preferably, the power conversion module comprises an inductor and N switch branches, wherein N is a natural number greater than or equal to 1;

[0012] Each switch branch is connected in parallel, connected between the input port and the reference ground, and includes a jumper capacitor and a first switch tube, a second switch tube, a third switch tube and a fourth switch tube connected in series in sequence;

[0013] The jumper capacitor is connected between a first connection end and a second connection end; the first connection end is a connection end between the first switch tube and the second switch tube, the second connection end is a connection end between the third switch tube and the fourth switch tube; the connection end between the second switch tube and the third switch tube is an intermediate node;

[0014] When N≥2, the intermediate nodes of the plurality of switch branches are connected together;

[0015] The first end of the inductor is connected to the middle node, and the second end of the inductor is connected to a load system.

[0016] Preferably, the output module includes a path switching switch;

[0017] One end of the path switching switch is connected to the intermediate node, and the other end is connected to the positive electrode of the battery; when the power conversion module operates in the first operating mode, the path switching switch is turned on, and when the power conversion module operates in the second operating mode, the path switching switch is turned off.

[0018] Preferably, the path switching switch comprises two sub-switches connected in series, and the sub-switches are connected with a common source or a common drain.

[0019] Preferably, the output module further comprises: a charge and discharge switch tube, one end of which is connected to the second end of the inductor, and the other end of which is connected to the positive electrode of the battery.

[0020] Preferably, the hybrid mode charging circuit also includes an isolating switch, which is connected in series between the input power supply and the input port of the power conversion module, and the isolating switch is turned on when the input power supply is normally powered, and is turned off when the input power supply is abnormally powered.

[0021] Preferably, the isolating switch, the charging and discharging switch tube and the switch tubes in each switch branch are integrated inside the chip, and the path switching switch is integrated inside the chip or placed outside the chip as a peripheral component.

[0022] Preferably, when the power conversion module operates in the first operating mode, the switching states of the first switch tube and the third switch tube in the same switch branch are the same, and the switching states of the second switch tube and the fourth switch tube in the same switch branch are the same and complementary to the switching state of the first switch tube in the same switch branch.

[0023] Preferably, when N≥2 and the power conversion module operates in the first operating mode, the phases of the drive signals of the first switch tubes in adjacent switch branches differ by a second preset angle to achieve staggered parallel operation, and the drive signals are used to control the conduction or disconnection of the corresponding switch tubes.

[0024] Preferably, the second preset angle is 360° / N.

[0025] Preferably, when the power conversion module operates in the second operating mode and N≥2, the switching states of the corresponding switch tubes in each switch branch are the same.

[0026] Preferably, the switching states of the third switch tube and the second switch tube in the same switch branch are complementary; the switching states of the fourth switch tube and the first switch tube in the same switch branch are complementary, the duty cycles of the drive signals of the first switch tube and the second switch tube in the same switch branch are the same and the phases differ by a first preset angle, and the drive signal is used to control the conduction or disconnection of the corresponding switch tube.

[0027] Preferably, the first preset angle is 180°.

[0028] Preferably, when the input power is not adjustable, the power conversion module operates in the second working mode; when the input power is adjustable, the power conversion module switches between the first working mode and the second working mode according to the voltage and current of the battery.

[0029] Preferably, when the input power supply is adjustable, when the voltage of the battery is lower than the minimum operating voltage of the load system, or when the voltage of the battery reaches the preset voltage and the current of the battery is lower than the first preset current and higher than the second preset current, the power conversion module operates in the second operating mode; when the voltage of the battery is higher than the minimum operating voltage of the load system and lower than the preset voltage, or when the voltage of the battery reaches the preset voltage and the current of the battery is higher than the first preset current, the power conversion module operates in the first operating mode; wherein, the first preset current is higher than the second preset current.

[0030] In a second aspect, an embodiment of the present invention further provides a hybrid mode charging system, the hybrid mode charging system comprising a mode switching circuit and a hybrid mode charging circuit;

[0031] The mode switching circuit receives a control signal, and the control signal controls the working state of the power conversion module according to the voltage and current of the battery. When the voltage of the battery is lower than the minimum working voltage of the load system, or when the voltage of the battery reaches the preset voltage and the current of the battery is lower than the first preset current and higher than the second preset current, the power conversion module works in the second working mode; when the voltage of the battery is higher than the minimum working voltage of the load system and lower than the preset voltage, or when the voltage of the battery reaches the preset voltage and the current of the battery is higher than the first preset current, the power conversion module works in the first working mode; wherein, the first preset current is higher than the second preset current.

[0032] Preferably, the control signal also switches the output path of the output switching module according to the battery voltage, so that when the power conversion module operates in the first operating mode, the path switching switch is turned on, and the power conversion module charges the battery through the path switching switch; when the power conversion module operates in the second operating mode, the path switching switch is turned off, and the power conversion module charges the battery through the charge and discharge switch tube.

[0033] Preferably, the hybrid mode charging system further comprises a charge and discharge control circuit;

[0034] The charge and discharge control circuit controls the state of the charge and discharge switch tube according to the voltage and current of the battery; when the voltage of the battery is less than the minimum operating voltage of the load system, the charge and discharge switch tube is in a linear modulation state; when the voltage of the battery is greater than the minimum operating voltage of the load system and less than a preset voltage, or when the battery voltage reaches the preset voltage and the battery current is greater than the second preset current, the charge and discharge switch tube is in a fully on state; when the voltage of the battery reaches the preset voltage and the battery current is less than the second preset current, the charge and discharge switch tube is in a cut-off state.

[0035] In a third aspect, an embodiment of the present invention further provides a hybrid mode charging method, the hybrid mode charging method comprising the following steps:

[0036] Switching the working mode of the power conversion module, when working in different working modes, all or part of the switch tubes in the power conversion module are reused to perform power conversion;

[0037] Switch the path in the output module: when the power conversion module operates in the first operating mode, the path switching switch is turned on, the ratio of the input voltage to the output voltage of the power conversion module is fixed, and the power conversion module charges the battery through the path switching switch; when the power conversion module operates in the second operating mode, the path switching switch is turned off, and the output signal of the power conversion module is adjusted according to the conduction time ratio of the switch tube in the power conversion module, and the power conversion module charges the battery through the charge and discharge switch tube.

[0038] Preferably, the hybrid mode charging method further comprises the following steps:

[0039] The state of the input power supply is detected. When the input power supply is abnormal, the isolation switch is disconnected; when the input power supply is normal, the isolation switch is turned on.

[0040] Preferably, the hybrid mode charging method also includes the following steps: detecting whether the input power supply is adjustable, and controlling the working state of the power conversion module according to whether the input power supply is adjustable: when the input power supply is not adjustable, controlling the power conversion module to work in the second working mode; when the input power supply is adjustable, controlling the power conversion module to switch between the first working mode and the second working mode.

[0041] Preferably, when the input power supply is adjustable, the working state of the power conversion module is switched according to the voltage and current of the battery;

[0042] When the battery voltage is lower than the minimum operating voltage of the load system, the power conversion module is controlled to operate in the second operating mode; when the battery voltage is higher than the minimum operating voltage of the load system and lower than a preset voltage, or when the battery voltage reaches the preset voltage and the battery current is higher than a first preset current, the power conversion module is controlled to operate in the first operating mode; when the battery voltage reaches the preset voltage and the battery current is lower than the first preset current and higher than a second preset current, the power conversion module is controlled to operate in the second operating mode; wherein the first preset current is higher than the second preset current.

[0043] Preferably, the hybrid mode charging method further comprises the following steps: controlling the state of the charging and discharging switch tube according to the voltage and current of the battery:

[0044] When the voltage of the battery is lower than the minimum operating voltage of the load system, controlling the charge and discharge switch tube to be in a linear modulation state;

[0045] When the voltage of the battery is greater than the minimum operating voltage of the load system and less than a preset voltage, or when the battery voltage reaches the preset voltage and the battery current is greater than the second preset current, the charge and discharge switch tube is controlled to be in a fully turned-on state;

[0046] When the voltage of the battery reaches a preset voltage and the current of the battery is less than the second preset current, the charge and discharge switch tube is controlled to be in a cut-off state.

[0047] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0048] 1. When the input power is not adjustable, it works in the second working mode; when the input power is adjustable, it can switch between the first working mode and the second working mode; thus, it can be compatible with non-paired adapters, and when the adapter is adjustable, it can realize pre-charging / constant current charging / constant voltage charging;

[0049] 2. When working in different working modes, all or part of the switch tubes in the power conversion module are reused for power conversion, and when working in the second working mode, the two channels work in the same phase, and the conversion efficiency is high; it can also save devices, save costs, reduce the solution area, and facilitate integration.

[0050] 3. When working in the first working mode, each switch branch works in a staggered phase, which can reduce ripple and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0052] Figure 1 A schematic diagram of a hybrid mode charging circuit in the prior art;

[0053] Figure 2 is a schematic diagram of a hybrid mode charging circuit of the present invention;

[0054] Figure 3 It is a schematic diagram of a driving signal of a first switch tube in a first switch branch and a second switch branch of a power conversion module in a hybrid mode charging circuit of the present invention in a first working mode;

[0055] Figure 4 It is a schematic diagram of a driving signal of a first switch tube in a first switch branch and a second switch branch when a power conversion module in a hybrid mode charging circuit of the present invention is in a second working mode;

[0056] Figure 5 The figure is a flow chart of the hybrid mode charging method of the present invention. DETAILED DESCRIPTION

[0057] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. It is possible for a person skilled in the art to fully understand the present invention without the description of these details. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail.

[0058] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0059] At the same time, it should be understood that in the following description, "circuit" refers to a conductive loop composed of at least one element or subcircuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected between" two nodes, it can be directly coupled or connected to another element or there can be an intermediate element, and the connection between the elements can be physical, logical, or a combination thereof. On the contrary, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0060] Embodiment 1

[0061] like Figure 2As shown, this embodiment discloses a hybrid mode charging circuit for a mobile device, including a power conversion module 11 and an output module 12; the power conversion module 11 supports at least two working modes: a first working mode and a second working mode; and in the first working mode and the second working mode, all or part of the switch tubes in the power conversion module 11 are reused for power conversion.

[0062] When the power conversion module 11 operates in the first operating mode, the ratio of the input voltage to the output voltage of the power conversion module 11 is fixed; when the power conversion module 11 operates in the second operating mode, the output signal of the power conversion module 11 is adjusted according to the conduction time ratio of the switch tube in the power conversion module 11.

[0063] It should be noted that, in this embodiment, the first operating mode is a switched capacitor mode, and the second operating mode is a three-level mode.

[0064] Specifically, the power conversion module 11 includes an inductor L and N switch branches, where N is a natural number greater than or equal to 1; each switch branch is connected in parallel and connected between an input port and a reference ground, including a jumper capacitor and a first switch tube, a second switch tube, a third switch tube and a fourth switch tube connected in series in sequence.

[0065] The cross-over capacitor CFLY is connected between a first connection end and a second connection end; the first connection end is the connection end between the first switch tube and the second switch tube, and the second connection end is the connection end between the third switch tube and the fourth switch tube; the connection end between the second switch tube and the third switch tube is an intermediate node; the intermediate nodes of the multiple switch branches are connected together; the first end of the inductor L is connected to the intermediate node, and the second end is connected to the load system. Figure 2 As shown, N=2 is taken as an example for explanation.

[0066] It should be noted that each switch branch may also include more switch tubes and cross-over capacitors; any composition of the power conversion module 11 that can support two working modes meets the requirements of the present invention, and is not listed here one by one. However, when the composition of the switch branch is listed in this embodiment, when working in two working modes, the utilization efficiency of the switch tube is the highest, so that the components of the power conversion module 11 are reduced and the cost is reduced.

[0067] like Figure 2As shown, the output module 12 includes a path switching switch and a charge-discharge switch tube QBAT; one end of the path switching switch is connected to the intermediate node, and the other end is connected to the positive electrode of the battery; one end of the charge-discharge switch tube QBAT is connected to the second end of the inductor L, and the other end is connected to the positive electrode of the battery; when the power conversion module 11 works in the first working mode, the power conversion module 11 outputs a signal through the first end (that is, the intermediate node) of the inductor L, the path switching switch is turned on, and the battery is charged through the path switching switch; when the power conversion module 11 works in the second working mode, the power conversion module 11 outputs a signal from the second end of the inductor L, the path switching switch is turned off, and the battery is charged through the charge-discharge switch tube QBAT.

[0068] As an example, Figure 2 As shown, the path switching switch includes two sub-switches connected in series: a first sub-switches QSCA and a second sub-switches QSCB, the two sub-switches are connected in common source or common drain; the two sub-switches are turned on or off at the same time; when the two sub-switches are both off, the body diodes of the two sub-switches are connected back to back, which can prevent the output signal of the power conversion module 11 from reaching the positive electrode of the battery through the body diode of one of the sub-switches when the path switching switch is off. When the two sub-switches are connected in common source mode, only one gate driver is needed to control the states of the two sub-switches at the same time; when the two sub-switches are connected in common drain mode, two independent gate drivers are needed to control the states of the two sub-switches respectively; optionally, the path switching switch can also be a single switch with a bidirectional blocking function.

[0069] like Figure 2 As shown, the hybrid mode charging circuit further includes an isolating switch QB, which is connected in series between the input power supply and the input port of the power conversion module 11. The isolating switch QB is turned on when the input power supply is normally powered, and is turned off when the input power supply is abnormally powered. As an example, Figure 2 As shown, the input module further includes a bypass capacitor, one end of which is connected to the input end of the power conversion module 11 , and the other end of which is connected to a reference ground, so as to filter out interference in the input signal of the power conversion module 11 .

[0070] Specifically, the isolation switch QB, the charge and discharge switch tube QBAT and the switch tubes in each switch branch are integrated inside the chip, and the path switching switch can be integrated inside the chip or placed outside the chip as a peripheral component. When the path switching switch is placed outside the chip, the two sub-switch tubes of the path switching switch can be integrated back-to-back switch tubes, and the jumper capacitor is set outside the chip because its large capacitance value will increase the chip packaging volume and cost, and the inductor L is also set outside the chip.

[0071] In an embodiment of the present invention, each switch tube can adopt various existing electrically controllable switch devices, such as a metal oxide semiconductor field effect transistor (MOSFET), a bipolar junction transistor (BJT), or an insulated gate bipolar transistor (IGBT), and the present invention is not limited to this.

[0072] When the power conversion module 11 operates in the first operating mode, the switching states of the first switch tube and the third switch tube in the same switch branch are the same, and the switching states of the second switch tube and the fourth switch tube in the same switch branch are the same and complementary to the switching state of the first switch tube in the same switch branch (when the first switch tube in the same switch branch is disconnected, the fourth switch tube is turned on; when the first switch tube in the same switch branch is turned on, the fourth switch tube is disconnected); the output voltage of the power conversion module 11 is one half of the input voltage of the power conversion module 11, and the output current of the power conversion module 11 is twice the input current of the power conversion module 11.

[0073] When N≥2, the switching states of the corresponding switch tubes in different switch branches are different, and the phases of the drive signals of the first switch tubes in adjacent switch branches differ by a second preset angle to achieve staggered parallel operation. At this time, the ripple of the input signal and the output signal (signals include voltage and current) can be reduced.

[0074] Specifically, the second preset angle is 360° / N.

[0075] As an example, Figure 3 As shown, when N=2, the phase difference between the driving signal G11 of the first switch tube Q11 in the first switch branch and the driving signal G21 of the first switch tube Q21 in the second switch branch is 180°, that is, when the first switch Q11 of the first switch branch is turned on, the first switch Q21 of the second switch branch is turned off; when the first switch Q11 of the first switch branch is turned off, the first switch Q21 of the second switch branch is turned on. When N=2, the utilization efficiency of the switch tube of the power conversion module 11 is the highest, so preferably, N=2.

[0076] When the power conversion module 11 operates in the second operating mode, each switch branch operates in parallel with the same phase. Figure 4 As shown, the driving signal G11 of the first switch tube Q11 in the first switch branch and the driving signal G21 of the first switch tube Q21 in the second switch branch are in phase. The switch states of the corresponding switch tubes in each switch branch are the same, that is, the first switch states in all switch branches are the same, the second switch states in all switch branches are the same, the third switch states in all switch branches are the same, and the fourth switch states in all switch branches are the same. The switch states of the third switch tube and the second switch tube in the same switch branch are complementary; the switch states of the fourth switch tube and the first switch tube in the same switch branch are complementary, the duty cycles of the driving signals of the first switch tube and the second switch tube in the same switch branch are the same and the phases differ by a first preset angle, and the driving signal is used to control the conduction or disconnection of the corresponding switch tube.

[0077] Specifically, the first preset angle is 180°.

[0078] It should be noted that, when working in the second working mode, in this embodiment, the voltages at the output ends of each switch branch remain consistent, and they can be directly connected and share the same inductor L and the same path switching switch; when the output voltages of each switch branch are different, the output ends of each switch branch cannot be connected, and the output ends of each switch branch are connected to the battery through different inductors L and different path switching switches, or the output ends of each switch branch are connected to the same second sub-switch tube QSCB through different inductors L and different first sub-switches QSCA (at this time, when at least one of the first sub-switches QSCA is turned on, the second sub-switches QSCB are all turned on); that is, when two or more channels work in the same phase, (N-1) path switching switches or (N-1) first sub-switches QSCA can be saved, and (N-1) inductors L can be saved at the same time.

[0079] When the input power supply is not adjustable, the power conversion module 11 operates in the second operating mode; when the input power supply is controlled and adjustable, the power conversion module 11 switches between the first operating mode and the second operating mode according to the voltage and current of the battery: when the voltage of the battery is less than the minimum operating voltage of the load system, the power conversion module 11 is controlled to operate in the second operating mode, so that the output voltage of the power conversion module 11 is equal to the minimum operating voltage of the load system to maintain the minimum operating voltage of the load system; when the voltage of the battery is greater than the minimum operating voltage of the load system and less than the preset voltage (the battery is not fully charged at this time), the power conversion module 11 operates in the first operating mode. mode, which is a constant current charging process; when the voltage of the battery reaches the preset voltage (the battery is nearly fully charged at this time) and the current of the battery is greater than the first preset current i1, the power conversion module 11 operates in the first operating mode, and by controlling the voltage of the input power supply, the output voltage of the power conversion module 11 is equal to the preset voltage to achieve high-efficiency high-current constant-voltage charging; when the voltage of the battery reaches the preset voltage and the current of the battery is less than the first preset current i1 and greater than the second preset current i2, the power conversion module 11 operates in the second operating mode to achieve constant-voltage charging; wherein, the first preset current i1 is greater than the second preset current i2.

[0080] At the same time, the state of the charge and discharge switch tube QBAT depends on the voltage and current of the battery. When the voltage of the battery is less than the minimum operating voltage of the load system, the power conversion module 11 operates in the second operating mode, and the charge and discharge switch tube QBAT is in a linear modulation state to achieve pre-charging; when the voltage of the battery is greater than the minimum operating voltage of the load system and less than the preset voltage, or when the voltage of the battery reaches the preset voltage and the current of the battery is greater than the first preset current i1, the power conversion module 11 operates in the first operating mode, and the charge and discharge switch tube QBAT is in a fully turned-on state to achieve high-efficiency and high-current charging; when the voltage of the battery reaches the preset voltage, and the current of the battery is less than the first preset current i1 and greater than the second preset current i2, the power conversion module 11 operates in the second operating mode, and the charge and discharge switch tube QBAT is in a fully turned-on state to achieve constant voltage charging; when the voltage of the battery reaches the preset voltage and the battery current is less than the second preset current i2, the charge and discharge switch tube QBAT is in a cut-off state, and the battery charging is completed at this time.

[0081] Specifically, the state of the charge and discharge switch tube QBAT also depends on the power supply state of the input power supply. When the input power supply is abnormal, the charge and discharge switch tube QBAT is in a fully turned-on state. At this time, the load system is powered by the battery.

[0082] It should be noted that when the battery voltage is lower than the minimum operating voltage of the load system, if the charge and discharge switch tube QBAT is fully turned on, the battery voltage is equal to the input voltage of the system load, which will cause the load system to operate at the minimum operating voltage, affecting the operation of the load system and possibly causing damage to related components. Therefore, when the charge and discharge switch is in a linear modulation state (incomplete conduction state), the battery is charged in a current limiting state to prevent the input voltage of the load system from being pulled down by the battery voltage.

[0083] Embodiment 2

[0084] This embodiment discloses a hybrid mode charging system, the hybrid mode charging system comprising a mode switching circuit and the hybrid mode charging circuit in the first embodiment;

[0085] The mode switching circuit receives a control signal, and the control signal controls the working state of the power conversion module 11 according to the voltage and current of the battery. When the voltage of the battery is less than the minimum working voltage of the load system, the power conversion module 11 works in the second working mode; when the voltage of the battery is greater than the minimum working voltage of the load system and less than a preset voltage, the power conversion module 11 works in the first working mode; when the voltage of the battery reaches the preset voltage and the current of the battery is greater than the first preset current i1, the power conversion module 11 works in the first working mode; when the voltage of the battery reaches the preset voltage and the current of the battery is less than the first preset current i1 and greater than the second preset current i2, the power conversion module 11 works in the second working mode; wherein, the first preset current i1 is greater than the second preset current i2. The control signal also switches the output path of the output switching module according to the battery voltage, so that when the power conversion module 11 operates in the first operating mode, the path switching switch is turned on, and the power conversion module 11 charges the battery through the path switching switch; when the power conversion module operates in the second operating mode, the path switching switch is turned off, and the power conversion module 11 charges the battery through the charge and discharge switch tube QBAT.

[0086] Specifically, the hybrid mode charging system also includes a charge and discharge control circuit; the charge and discharge control circuit controls the state of the charge and discharge switch tube QBAT according to the voltage and current of the battery; when the voltage of the battery is less than the minimum operating voltage of the load system, the charge and discharge switch tube QBAT is in a linear modulation state; when the voltage of the battery is greater than the minimum operating voltage of the load system and less than a preset voltage, or when the battery voltage reaches the preset voltage and the current of the battery is greater than the second preset current i2, the charge and discharge switch tube QBAT is in a fully on state; when the voltage of the battery reaches the preset voltage and the current of the battery is less than the second preset current i2, the charge and discharge switch tube QBAT is in a cut-off state.

[0087] As an example, the hybrid mode charging circuit may further include a sampling module to collect the voltage and current of the battery.

[0088] Embodiment 3

[0089] like Figure 5 As shown, this embodiment discloses a hybrid mode charging method. In this embodiment, the hybrid mode charging method is implemented based on the hybrid mode charging circuit in the first embodiment and the hybrid mode charging system in the second embodiment. The actual implementation of the hybrid mode charging method includes but is not limited to the implementation based on the hybrid mode charging circuit and system in the first embodiment and the second embodiment. The hybrid mode charging method includes the following steps:

[0090] S1: Detect the state of the input power supply, and control the isolation switch QB according to whether the input power supply is normally supplied: when the input power supply is abnormal, execute step S11, and when the input power supply is normally supplied, execute step S12.

[0091] S11: Disconnect the isolating switch QB.

[0092] S12: Turn on the isolation switch QB.

[0093] S2: Detect whether the input power is adjustable, and control the working mode of the power conversion module 11 according to whether the input power is adjustable: when the input power is not adjustable, execute step S21; when the input power is adjustable, execute step S22.

[0094] S21: Control the power conversion module 11 to operate in the second operating mode.

[0095] S22: The mode switching circuit controls the working state of the power conversion module 11 according to the voltage and current of the battery, so that the power conversion module 11 switches between the first working mode and the second working mode according to the voltage and current of the battery: when the battery voltage is lower than the minimum working voltage of the load system, or when the battery voltage reaches the preset voltage and the battery current is lower than the first preset current i1 and higher than the second preset current i2, execute step S21; when the battery voltage is higher than the minimum working voltage of the load system and lower than the preset voltage, or when the battery voltage reaches the preset voltage and the battery current is higher than the first preset current i1, execute step S221.

[0096] S221: Control the power conversion module 11 to operate in a first operating mode.

[0097] S3: Switch the conduction path of the output module 12 according to the working mode of the power conversion module 11; when the power conversion module 11 works in the first working mode, execute step S31; when the power conversion module 11 works in the second working mode, execute step S32.

[0098] S31: Turning on the path switching switch, the power conversion module 11 charges the battery through the path switching switch.

[0099] S32: The path switching switch is turned off, and the power conversion module 11 charges the battery through the charge and discharge switch tube QBAT.

[0100] S4: The charge and discharge control circuit controls the state of the charge and discharge switch tube QBAT according to the voltage and current of the battery; when the voltage of the battery is less than the minimum operating voltage of the load system, execute step S41; when the voltage of the battery is greater than the minimum operating voltage of the load system and less than the preset voltage, or when the battery voltage reaches the preset voltage and the battery current is greater than the second preset current, execute step S42; when the voltage of the battery reaches the preset voltage and the battery current is less than the second preset current i2, execute step S43.

[0101] S41: Control the charge and discharge switch tube QBAT to be in a linear adjustment state.

[0102] S42: Control the charge and discharge switch tube QBAT to be in a fully turned-on state.

[0103] S43: Control the charge and discharge switch tube QBAT to be in a cut-off state.

[0104] It should be noted that steps S11 and S12 are sub-steps of step S1, steps S21 and S22 are sub-steps of step S2, steps S21 and S221 are sub-steps of step S22, steps S31 and S32 are sub-steps of step S3, and steps S41, S42 and S43 are sub-steps of step S4. In step S22, when working in different working modes, all or part of the switch tubes in the power conversion module 11 are reused for power conversion. Step S3 can be performed after step S4, before step S4, or simultaneously with step S4, such as Figure 5 As shown, the order of steps S3 and S4 is not marked. The first preset current i1 is greater than the second preset current i2.

[0105] It should be further explained that, in the process of executing step S3 or S4, step S1 can be executed, and it is not necessary to execute in the order of S1, S2, S3, S4, that is, steps S1, S2, S3, S4 do not represent the order of execution; and step S2, step S3 or step S4 is executed when the battery is powered normally, that is, step S2, step S3 or step S4 is executed after executing step S12.

[0106] In summary, the present invention provides a hybrid mode charging circuit including a power conversion module 11 and an output module 12; when the power conversion module 11 works in a first working mode and a second working mode, all or part of the switch tubes in the power conversion module 11 are reused for power conversion. When the power conversion module 11 works in the first working mode, the ratio of the input voltage to the output voltage of the power conversion module 11 is fixed; when the power conversion module 11 works in the second working mode, the output signal of the power conversion module 11 is adjusted according to the conduction time ratio of the switch tube in the power conversion module 11; in different working modes, the position of the output signal of the power conversion module 11 is different. When the power conversion module 11 works in the first working mode, the battery is charged by turning on the path switching switch; when the power conversion module 11 works in the second working mode, the path switching switch is turned off, and the battery is charged through the charge and discharge switch tube QBAT. The present invention also provides a hybrid mode charging system, which includes a mode switching circuit and a hybrid mode charging circuit; the mode switching circuit receives a control signal to control the state of the hybrid charging mode charging circuit; the present invention also provides a hybrid mode charging method; when the input power supply is not adjustable, it works in the second working mode, and when the input power supply is adjustable, it can switch between the first working mode and the second working mode, so that it can be compatible with non-paired adapters and can realize pre-charging / constant current charging / constant voltage charging; when working in different working modes, all or part of the switch tubes in the power conversion module 11 are reused for power conversion, and when working in the second working mode, each switch branch works in the same phase, the conversion efficiency is high, and devices can be saved to facilitate the integration of the hybrid mode charging circuit; when working in the first working mode, each switch branch works in a staggered phase to reduce ripple and improve efficiency.

[0107] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A hybrid mode charging circuit for a mobile device, characterized in that: The hybrid mode charging circuit includes a power conversion module and an output module; The power conversion module supports at least two working modes: a first working mode and a second working mode; and when working in the first working mode and the second working mode, all or part of the switch tubes in the power conversion module are reused to perform power conversion; When the power conversion module operates in the first working mode, the ratio of the input voltage to the output voltage of the power conversion module is fixed; when the power conversion module operates in the second working mode, the output signal of the power conversion module is adjusted according to the conduction time ratio of the switch tube in the power conversion module; In different working modes, the positions of the output signals of the power conversion module are different, and by switching different paths in the output module, the power conversion module charges the battery through different paths; The power conversion module includes an inductor, a first end of which is connected to a switch tube in the power conversion module, and a second end of which is connected to a load system; the output module includes a charge-discharge switch tube, one end of which is connected to the second end of the inductor, and the other end of which is connected to the positive electrode of the battery; and the state of the charge-discharge switch tube is controlled according to the voltage and current of the battery, including: When the voltage of the battery is lower than the minimum operating voltage of the load system, controlling the charge and discharge switch tube to be in a linear modulation state; When the voltage of the battery is greater than the minimum operating voltage of the load system and less than a preset voltage, or when the battery voltage reaches the preset voltage and the battery current is greater than a second preset current, the charge and discharge switch tube is controlled to be in a fully on state; when the voltage of the battery reaches the preset voltage and the current of the battery is less than the second preset current, the charge and discharge switch tube is controlled to be in a cut-off state.

2. The hybrid mode charging circuit according to claim 1, characterized in that: The power conversion module further includes N switch branches, wherein N is a natural number greater than or equal to 1; Each switch branch is connected in parallel, connected between the input port and the reference ground, and includes a jumper capacitor and a first switch tube, a second switch tube, a third switch tube and a fourth switch tube connected in series in sequence; The jumper capacitor is connected between a first connection end and a second connection end; the first connection end is a connection end between the first switch tube and the second switch tube, the second connection end is a connection end between the third switch tube and the fourth switch tube; the connection end between the second switch tube and the third switch tube is an intermediate node; When N≥2, the middle nodes of the switch branches are connected together, and the first end of the inductor is connected to the middle node.

3. The hybrid mode charging circuit according to claim 2, characterized in that: The output module also includes a path switching switch; One end of the path switching switch is connected to the intermediate node, and the other end is connected to the positive electrode of the battery; when the power conversion module operates in the first operating mode, the path switching switch is turned on, and when the power conversion module operates in the second operating mode, the path switching switch is turned off.

4. The hybrid mode charging circuit according to claim 3, characterized in that: The path switching switch includes two sub-switch tubes connected in series, and the sub-switch tubes are connected with a common source or a common drain.

5. The hybrid mode charging circuit according to claim 3, characterized in that: When the input power is adjustable, the state of the charge and discharge switch tube depends on the voltage and current of the battery.

6. The hybrid mode charging circuit according to claim 5, characterized in that: The hybrid mode charging circuit also includes an isolating switch, which is connected in series between an input power source and an input port of the power conversion module. The isolating switch is turned on when the input power source is supplying power normally, and is turned off when the input power source is supplying power abnormally.

7. The hybrid mode charging circuit according to claim 6, characterized in that: The isolating switch, the charging and discharging switch tube and the switch tubes in each switch branch are integrated inside the chip, and the path switching switch is integrated inside the chip or placed outside the chip as a peripheral component.

8. The hybrid mode charging circuit according to claim 2, characterized in that: When the power conversion module operates in the first operating mode, the switching states of the first switch tube and the third switch tube in the same switch branch are the same, and the switching states of the second switch tube and the fourth switch tube in the same switch branch are the same and complementary to the switching state of the first switch tube in the same switch branch.

9. The hybrid mode charging circuit according to claim 8, characterized in that: When N≥2 and the power conversion module operates in the first operating mode, the phases of the drive signals of the first switch tubes in adjacent switch branches differ by a second preset angle to achieve staggered parallel operation, and the drive signals are used to control the conduction or disconnection of the corresponding switch tubes.

10. The hybrid mode charging circuit according to claim 9, characterized in that: The second preset angle is 360° / N.

11. The hybrid mode charging circuit according to claim 2, characterized in that: When N≥2, and the power conversion module operates in the second operating mode, the switching states of the corresponding switch tubes in each switch branch are the same.

12. The hybrid mode charging circuit according to claim 11, characterized in that: When N≥2, and the power conversion module operates in the second operating mode, the switching states of the third switch tube and the second switch tube in the same switch branch are complementary; the switching states of the fourth switch tube and the first switch tube in the same switch branch are complementary, and the duty cycles of the drive signals of the first switch tube and the second switch tube in the same switch branch are the same and the phases differ by a first preset angle, and the drive signal is used to control the conduction or disconnection of the corresponding switch tube.

13. The hybrid mode charging circuit according to claim 12, characterized in that: The first preset angle is 180°.

14. The hybrid mode charging circuit according to any one of claims 1 to 13, characterized in that: When the input power is not adjustable, the power conversion module operates in the second working mode; when the input power is adjustable, the power conversion module switches between the first working mode and the second working mode according to the voltage and current of the battery.

15. The hybrid mode charging circuit according to claim 14, characterized in that: When the input power supply is adjustable, when the voltage of the battery is lower than the minimum operating voltage of the load system, or when the voltage of the battery reaches a preset voltage and the current of the battery is lower than a first preset current and higher than a second preset current, the power conversion module operates in the second operating mode; when the voltage of the battery is higher than the minimum operating voltage of the load system and lower than the preset voltage, or when the voltage of the battery reaches the preset voltage and the current of the battery is higher than the first preset current, the power conversion module operates in the first operating mode; wherein, the first preset current is higher than the second preset current.

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