CN212909030U - Power management chip and application circuit and electronic equipment thereof - Google Patents
Power management chip and application circuit and electronic equipment thereof Download PDFInfo
- Publication number
- CN212909030U CN212909030U CN202021477947.9U CN202021477947U CN212909030U CN 212909030 U CN212909030 U CN 212909030U CN 202021477947 U CN202021477947 U CN 202021477947U CN 212909030 U CN212909030 U CN 212909030U
- Authority
- CN
- China
- Prior art keywords
- circuit
- charging
- voltage
- power
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a power management chip and application circuit and electronic equipment thereof, include: a charging circuit for charging the battery; a driving circuit for driving an external device; the power supply switching circuit is used for switching the power supply to supply power to the driving circuit; a voltage reference circuit for providing a reference voltage; the charging circuit and the power supply switching circuit are connected with a charger and a battery, the driving circuit is connected with the power supply switching circuit and an external device, and the voltage reference circuit is respectively connected with the charging circuit and the driving circuit. The utility model integrates the charging circuit and the driving circuit, charges the battery and drives the external device; and the power supply switching of an external power supply and the battery is realized through the power supply switching circuit, the power is supplied to the driving circuit, and the charging and discharging management of the lithium battery is realized in the same chip.
Description
Technical Field
The utility model relates to a power management field, in particular to power management chip and application circuit and electronic equipment thereof.
Background
Lithium ion batteries are increasingly used in portable electronic products, such as electronic bracelets, electric toothbrushes, electronic atomizers, bluetooth headsets, due to their advantages of large energy-to-volume ratio, long cycle life, small self-discharge, fast charging, and the like. In the applications, the fine management of charging and discharging of the lithium ion battery is a key for ensuring the energy efficiency, performance and safety of products.
In the current market, a plurality of integrated circuits are matched to realize charging and discharging management, so that the portable product has the advantages of more peripheral devices, large occupied space, difficulty in miniaturization, high cost, poor stability, low energy efficiency and high standby power consumption.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, the present invention provides a power management chip, an application circuit thereof and an electronic device, which are capable of charging a battery and driving an external device by integrating a charging circuit and a driving circuit; and the power supply switching of an external power supply and the battery is realized through the power supply switching circuit, the power is supplied to the driving circuit, and the charging and discharging management of the lithium battery is realized in the same chip.
In order to achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a power management chip, include:
a charging circuit for charging the battery;
a driving circuit for driving an external device;
the power supply switching circuit is used for switching the power supply to supply power to the driving circuit;
a voltage reference circuit for providing a reference voltage;
the charging circuit and the power supply switching circuit are connected with a charger and a battery, the driving circuit is connected with the power supply switching circuit and an external device, and the voltage reference circuit is respectively connected with the charging circuit and the driving circuit.
The charging circuit includes:
a charge detection circuit for detecting a power supply voltage and starting or stopping charging according to the power supply voltage;
a charging mode detection circuit for detecting a battery voltage at the start of charging and switching a charging mode according to the battery voltage;
a trickle control circuit for trickle charging the battery when switching to the trickle charge mode;
the constant current control circuit is used for performing constant current charging on the battery when the battery is switched to a constant current charging mode;
a constant voltage control circuit for constant voltage charging the battery when switching to the constant voltage charging mode;
a charge switch for powering the battery when on;
the charging detection circuit is connected with the charger, the charging mode detection circuit and the charging switch, the charging mode detection circuit is further connected with the trickle control circuit, the constant current control circuit and the constant voltage control circuit, the trickle control circuit, the constant current control circuit and the constant voltage control circuit are all connected with the charging switch, and the charging switch is further connected with the battery.
The charging circuit further comprises a first over-temperature protection circuit for performing over-temperature protection on the charging circuit, and the first over-temperature protection circuit is respectively connected with the trickle control circuit, the constant current control circuit, the constant voltage control circuit, the charging switch and the charging detection circuit.
The drive circuit includes: a power supply circuit for supplying power to an external device; the power supply circuit is connected with the first enabling signal and is connected with the voltage reference circuit, the power supply switching circuit and the external device.
The power supply circuit includes:
the first voltage stabilizing circuit is used for supplying power to an external device;
a plurality of second voltage stabilizing circuits for supplying power to external devices;
the first voltage stabilizing circuit and the second voltage stabilizing circuit are both connected with the voltage reference circuit and an external device; the second voltage stabilizing circuit is also connected with the first enabling signal, and the second voltage stabilizing circuit is controlled to be switched on or switched off by the first enabling signal.
The first voltage stabilizing circuit comprises a first operational amplifier circuit, a first current limiting control circuit, a first power tube, a first resistor and a second resistor;
the inverting input end of the first operational amplifier circuit is connected with the voltage reference circuit, the non-inverting input end of the first operational amplifier circuit is connected with one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected with an external device and the drain electrode of the first power tube, the other end of the second resistor is grounded, the source electrode of the first power tube is connected with the power supply switching circuit, and the grid electrode of the first power tube is connected with the output end of the first operational amplifier circuit and the first current-limiting control circuit.
The second voltage stabilizing circuit comprises a second operational amplifier circuit, a second current limiting control circuit, a second power tube, a third resistor and a fourth resistor;
the inverting input end of the second operational amplification circuit is connected with the voltage reference circuit, the non-inverting input end of the second operational amplification circuit is connected with one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected with an external device and the drain electrode of the second power tube, the source electrode of the second power tube is connected with the power supply switching circuit, the grid electrode of the second power tube is connected with the output end of the second operational amplification circuit and the current-limiting control circuit, and the enable end of the second operational amplification circuit is connected with the first enable signal and the current-limiting control circuit.
The driving circuit further comprises a second over-temperature protection circuit used for performing over-temperature protection on the driving circuit, and the second over-temperature protection circuit is connected with the power supply switching circuit, the first voltage stabilizing circuit and the second voltage stabilizing circuit.
The drive circuit further includes: the battery under-voltage detection circuit is used for detecting whether the battery voltage is in an under-voltage state and outputting a battery under-voltage signal, and is connected with the battery, the charging module and the power supply switching circuit.
The drive circuit further includes: the first end of the first transistor is connected with a second enabling signal, the second end of the first transistor is connected with the external device, and the third end of the first transistor is grounded.
An application circuit of a power management chip comprises the power management chip, at least one external device, a charger and a battery; the power management chip is respectively connected with the charger, the battery and an external device.
The external devices are respectively: the first capacitor, the second capacitor, the fifth resistor, the main control chip, the first external device, the second external device and the third external device;
the positive electrode of the output end of the charger is connected with one end of the first capacitor, the power supply switching circuit and the charging circuit, one end of the fifth resistor is connected with the charging circuit, and the negative electrode of the charger, the other end of the first capacitor and the other end of the fifth resistor are all grounded;
the positive electrode of the battery is connected with one end of the second capacitor, the charging circuit and the driving circuit, and the main control chip is connected with the driving circuit;
the driving circuit is also connected to the first external device, the second external device, and the third external device.
An electronic device, comprising: the application circuit of the power management chip is connected with the battery and the external device respectively.
Compared with the prior art, the utility model provides a power management chip and application circuit and electronic equipment thereof, include: a charging circuit for charging the battery; a driving circuit for driving an external device; the power supply switching circuit is used for switching the power supply to supply power to the driving circuit; a voltage reference circuit for providing a reference voltage; the charging circuit and the power supply switching circuit are connected with a charger and a battery, the driving circuit is connected with the power supply switching circuit and an external device, and the voltage reference circuit is respectively connected with the charging circuit and the driving circuit. The utility model integrates the charging circuit and the driving circuit, charges the battery and drives the external device; and the power supply switching of an external power supply and the battery is realized through the power supply switching circuit, the power is supplied to the driving circuit, and the charging and discharging management of the lithium battery is realized in the same chip.
Drawings
Fig. 1 is a block diagram of a power management chip provided by the present invention;
fig. 2 is a circuit diagram of a first voltage stabilizing circuit provided by the present invention;
fig. 3 is a circuit diagram of a second voltage stabilizing circuit provided by the present invention;
fig. 4 is a packaging structure diagram of the power management chip provided by the present invention;
fig. 5 is a circuit diagram of an exemplary application of the power management chip provided by the present invention.
Detailed Description
The utility model provides a power management chip, an application circuit thereof and an electronic device, which charges a battery and drives an external device by integrating a charging circuit and a driving circuit; and the power supply switching of an external power supply and the battery is realized through the power supply switching circuit, the power is supplied to the driving circuit, and the charging and discharging management of the lithium battery is realized in the same chip.
The present invention is described in more detail in order to facilitate the explanation of the technical idea, the technical problem solved, the technical features of the technical solution, and the technical effects brought by the present invention. The description of the embodiments is not intended to limit the scope of the present invention. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
For the convenience of understanding the embodiments of the present application, relevant elements related to the embodiments of the present application will be described first.
External device: the external device of the present invention is a peripheral device outside the power management chip. The peripheral devices can be diodes, triodes, resistors, capacitors, control chips and the like.
Power supply voltage: the utility model discloses in mains voltage be when charging, the voltage that outside charger provided.
Battery voltage: the power supply voltage of the present invention is the voltage supplied by the battery.
Lithium ion batteries are increasingly used in portable electronic products, such as electronic bracelets, electric toothbrushes, electronic atomizers, bluetooth headsets, due to their advantages of large energy-to-volume ratio, long cycle life, small self-discharge, fast charging, and the like. In the applications, the fine management of charging and discharging of the lithium ion battery is a key for ensuring the energy efficiency, performance and safety of products.
In the current market, a plurality of integrated circuits are matched to realize charging and discharging management, so that the portable product has the advantages of more peripheral devices, large occupied space, difficulty in miniaturization, high cost, poor stability, low energy efficiency and high standby power consumption.
In order to solve the problem, the utility model discloses fill the lithium cell, discharge management function is integrated in same chip, to the characteristics of portable product, has integrateed three routes LDO and has realized the output of multi-channel power supply, the power NMOS of the same kind realizes power output simultaneously, and the product integrated level is high, small, stand-by power consumption is extremely low, with low costs, the reliability is high.
Referring to fig. 1, the present invention provides a power management chip 10, including: a charging circuit 100 for charging the battery BAT; a driving circuit 200 for driving an external device; a power switching circuit 300 for switching a power supply to supply power to the driving circuit 200; a voltage reference circuit 400 for providing a reference voltage; the charging circuit 100 and the power switching circuit 300 are connected to a charger 20 and a battery BAT, the driving circuit 200 is connected to the power switching circuit 300 and an external device, and the voltage reference circuit 400 is connected to the charging circuit 100 and the driving circuit 200, respectively.
In this embodiment, the power management chip 10 of the present invention is produced by a high-performance digital-analog hybrid CMOS integrated circuit process. The charging circuit 100, the driving circuit 200, the power switching circuit 300 and the reference circuit are integrated into a same chip, so that the power management chip 10 in this embodiment is packaged.
In this embodiment, when the battery BAT needs to be charged, the charging circuit 100 is connected to the charger 20 to provide a power supply voltage to charge the battery BAT, and meanwhile, the driving circuit 200 may also be used to supply power to an external device. Specifically, when the charger 20 is connected, at this time, the power voltage is higher than the battery voltage, the power switching circuit 300 switches the power voltage to the power voltage and outputs the power voltage to the driving circuit 200 and the voltage reference circuit 400, the power voltage supplies power to the driving circuit 200 and the voltage reference circuit 400, and the voltage reference circuit 400 provides a reference voltage for the driving circuit 200 in real time, so that the driving circuit 200 can supply power to an external device. When the charger 20 is not connected, the power voltage is 0V, so the battery voltage is higher than the power voltage, the power switching circuit 300 switches to the battery voltage and outputs the battery voltage to the driving circuit 200 and the voltage reference circuit 400, the battery voltage supplies power to the driving circuit 200 and the voltage reference circuit 400, and the voltage reference circuit 400 supplies the reference voltage to the driving circuit 200 in real time, so that the driving circuit 200 can supply power to an external device.
In summary, in the present embodiment, the external device can be powered by the driving circuit 200 while charging the battery BAT, and when charging is not needed, the external device can also be powered by the driving circuit 200 via the battery BAT, so that the external device can be driven to operate while charging and discharging management of the battery BAT is implemented.
Specifically, with continued reference to fig. 1, the charging circuit 100 includes: a charge detection circuit 110 for detecting a power supply voltage, starting or stopping charging according to the power supply voltage; a charging mode detection circuit 120 for detecting a battery voltage at the start of charging and switching a charging mode according to the battery voltage; a trickle control circuit 130 for trickle-charging the battery BAT when switching to the trickle charge mode; a constant current control circuit 140 for performing constant current charging on the battery BAT when switching to the constant current charging mode; a constant voltage control circuit 150 for performing constant voltage charging of the battery BAT when switching to the constant voltage charging mode; a charge switch Q1 for powering the battery BAT when turned on; the charging detection circuit 110 is connected to the charger 20, the charging mode detection circuit 120 and the charging switch Q1, the charging mode detection circuit 120 is further connected to the trickle control circuit 130, the constant current control circuit 140 and the constant voltage control circuit 150, the trickle control circuit 130, the constant current control circuit 140 and the constant voltage control circuit 150 are all connected to the charging switch Q1, and the charging switch Q1 is further connected to the battery BAT.
In specific implementation, in this embodiment, the charging detection circuit 110 detects a power supply voltage, and when the power supply voltage is higher than a first preset value, the charging detection circuit 110 controls the charging mode detection circuit 120 to start charging; when the power voltage is lower than a first preset value, the charging detection circuit 110 controls the charging mode detection circuit 120 to stop charging. In particular, in this embodiment, the first preset value is 4.5V (volt), and other values may also be set according to actual needs, which is not limited herein.
In the present embodiment, the charging mode is divided into a trickle charging mode, a constant current charging mode, and a constant voltage charging mode. When charging is started, the charging detection circuit 110 accesses the power voltage and outputs the power voltage to the charging mode detection circuit 120, the charging mode detection circuit 120 detects the battery voltage, selects a charging mode according to the battery voltage, and outputs a charging state signal to an external device. When the battery voltage is smaller than a second preset value, the charging mode is switched to the trickle charging mode, and the trickle control circuit 130 controls the charging switch Q1 to be switched on to perform trickle charging on the battery BAT. When the battery voltage is greater than the second preset value and less than the third preset value, the charging mode is switched to the constant current charging mode, and the constant current control circuit 140 controls the charging switch Q1 to be switched on to perform constant current charging on the battery BAT. When the battery voltage reaches a third preset value (i.e., equal to the third preset value), the constant voltage control circuit 150 switches to the constant voltage charging mode, so as to limit the battery voltage to the third preset value, and control the charging switch Q1 to be turned on to perform constant voltage charging on the battery BAT. In particular, in this embodiment, the second preset value is 3.05V, and the third preset value is 4.2V.
Specifically, during trickle charging, the current value of the trickle current is 0.1 time of the preset current; and during constant current charging, the current value of the constant current is equal to the current value of the preset current. Particularly, the preset current is set by an external resistor, and different resistors can be selected according to actual needs to obtain different preset currents.
Further, when the charging mode is in the constant voltage charging mode, the charging current gradually decreases, and when the value of the charging current is lower than the current value of one tenth of the preset current, the charging is completed, and the charging detection circuit 110 controls the charging switch Q1 to be turned off, so as to stop the charging.
The charging switch Q1 is a PMOS transistor, and the gate of the charging switch Q1 is connected to the trickle control circuit 130, the constant current control circuit 140, and the constant voltage control circuit 150, and is controlled by the trickle control circuit 130, the constant current control circuit 140, and the constant voltage control circuit 150. The source electrode of the charging switch Q1 is connected with the positive electrode of the charger 20 and is used for being connected with power supply voltage, the drain electrode of the charging switch Q1 is connected with the battery BAT, and when the charging switch Q1 is switched on, the power supply voltage is connected to charge the battery BAT.
Further, the charging circuit 100 further includes a first over-temperature protection circuit 160 for performing over-temperature protection on the charging circuit 100, and the first over-temperature protection circuit 160 is respectively connected to the trickle control circuit 130, the constant current control circuit 140, the constant voltage control circuit 150, the charging switch Q1, and the charging detection circuit 110.
In specific implementation, in this embodiment, the chip temperature is detected when the charging circuit 100 operates, and when the chip temperature is too high (for example, higher than 150 ℃), the charging switch Q1 is turned off to stop charging; when the temperature of the chip is reduced to a certain value (for example, lower than 110 ℃), the charging switch Q1 is turned on, and charging is started again; over-temperature protection of the charging circuit 100 is achieved.
Specifically, with continued reference to fig. 1, the driving circuit 200 includes: a power supply circuit 210 for supplying power to an external device; the power supply circuit 210 receives a first enable signal and is connected to the voltage reference circuit 400, the power switching circuit 300 and an external device. In this embodiment, the power supply circuit 210 is powered by the power switching circuit 300, and the specific power supply manner is the same as that described above, and is not described in detail herein. When the power supply circuit 210 is powered on, the voltage reference circuit 400 provides a reference voltage (also referred to as a reference voltage), and then the power supply circuit 210 outputs a stable driving voltage to an external device according to the reference voltage to drive the external device to operate.
Specifically, referring to fig. 1 and fig. 2, the power supply circuit 210 includes: a first voltage stabilizing circuit 211 for supplying power to an external device; a plurality of second stabilizing circuits 212 for supplying power to external devices; the first voltage stabilizing circuit 211 and the second voltage stabilizing circuit 212 are both connected with the voltage reference circuit 400 and an external device; the second voltage stabilizing circuit 212 is further connected to the first enable signal, and the second voltage stabilizing circuit 212 is controlled to be turned on or off by the first enable signal.
In specific implementation, in this embodiment, the first voltage stabilizing circuit 211 is used as a common power supply output in the driving circuit 200, and outputs a corresponding voltage to an external device as long as the external device is connected, so as to drive the external device to operate. The second voltage stabilizing circuit 212 is a controllable output, and is controlled to be turned on or off by an external first enable signal, and is turned on when the first enable signal is valid to supply power to an external device, and is turned off when the first enable signal is invalid. In particular, in this embodiment, the first voltage stabilizing circuit 211 may be connected to an external main control chip 30 to charge the main control chip 30; the second stabilizing circuit 212 may provide power to other external devices. It should be noted that the first voltage stabilizing circuit 211 and the second voltage stabilizing circuit 212 are not limited to supplying power to the external devices listed above, and the external devices may be connected to the corresponding voltage stabilizing circuits according to actual needs, for example, the first voltage stabilizing circuit 211 may be connected to the first voltage stabilizing circuit without controlling a power supply switch, and the second voltage stabilizing circuit 212 may be connected to the power supply switch if necessary. In this embodiment, a plurality of second voltage stabilizing circuits 212 may be provided.
Specifically, referring to fig. 2, the first voltage stabilizing circuit 211 includes a first operational amplifier circuit 2111, a first current limiting control circuit 2112, a first power transistor, a first resistor R1, and a second resistor R2; the inverting input terminal of the first operational amplifier circuit 2111 is connected to the voltage reference circuit 400, the non-inverting input terminal of the first operational amplifier circuit 2111 is connected to one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected to an external device and the drain of the first power transistor, the other end of the second resistor R2 is grounded, the source of the first power transistor is connected to the power switching circuit 300, and the gate of the first power transistor is connected to the output terminal of the first operational amplifier circuit 2111 and the first current limiting control circuit 2112.
In this embodiment, the first power transistor is a PMOS transistor, the source of the first power transistor is connected to the input voltage (denoted as VIN) provided by the power switching circuit 300, and the first power transistor is turned on, and outputs the first driving voltage (denoted as LDO1) from the drain to the external device. At this time, the first driving voltage is divided by the first resistor R1 and the second resistor R2 in sequence and then grounded, the reference voltage is connected to the inverting input terminal of the first operational amplifier circuit 2111, the divided voltage of the first resistor R1 and the second resistor R2 is connected to the non-inverting input terminal of the first operational amplifier circuit 2111, and then the corresponding voltage is output to the gate of the first power transistor by the output terminal of the first operational amplifier circuit 2111 to control the first power transistor; a feedback loop is formed by the first operational amplifier circuit 2111, the first power transistor, the first resistor R1 and the second resistor R2, and when the input voltage VIN and the first driving current (i.e., the current generated by the first driving voltage) vary within a normal range, the first operational amplifier circuit 2111 controls the conduction state of the first power transistor to keep the output of the first driving voltage constant.
The current limiting control circuit detects the current of the first power tube in real time, and sets the maximum current value of the first power tube at a specified value (for example, 300mA) by controlling the conduction state of the first power tube, wherein the maximum current value can be set according to actual requirements, which is not limited herein. Further, the first driving voltage is set by the following formula: VOUT ═ VREF (R1+ R2)/R2. It should be noted that the first current limiting control circuit 2112 is a conventional circuit, and is generally implemented by components such as a MOS transistor and a resistor, and a person skilled in the art can set the circuit according to actual situations, and details thereof are not described herein.
Specifically, referring to fig. 3, the second voltage stabilizing circuit 212 includes a second operational amplifier 2121, a second current limiting control circuit 2122, a second power transistor, a third resistor R3, and a fourth resistor R4; the inverting input terminal of the second operational amplifier 2121 is connected to the voltage reference circuit 400, the non-inverting input terminal of the second operational amplifier 2121 is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is connected to an external device and the drain of the second power transistor, the source of the second power transistor is connected to the power switching circuit 300, the gate of the second power transistor is connected to the output terminal of the second operational amplifier 2121 and the current-limiting control circuit, and the enable terminal of the second operational amplifier 2121 receives the first enable signal and is connected to the current-limiting control circuit.
In this embodiment, the second power transistor is a PMOS transistor, a source of the second power transistor is connected to the input voltage provided by the power switching circuit 300, and the second power transistor is turned on, and outputs a second driving voltage (denoted as LDO2) from a drain to an external device.
At this time, the third resistor R3 and the fourth resistor R4 divide the second driving voltage sequentially and then ground. The enable terminal of the second operational amplifier 2121 receives a first enable signal, when the first enable signal is valid, the second operational amplifier 2121 is turned on, the reference voltage is received by the inverting input terminal of the second operational amplifier 2121, the divided voltage of the third resistor R3 and the fourth resistor R4 is received by the non-inverting input terminal of the second operational amplifier 2121, and then the output terminal of the second operational amplifier 2121 outputs a corresponding voltage to the gate of the second power transistor to control the second power transistor; a feedback loop is formed by the second operational amplifier 2121, the second power transistor, the third resistor R3 and the fourth resistor R4, and when the input voltage VIN and the second driving current (i.e., the current generated by the second driving voltage) vary within a normal range, the second operational amplifier 2121 controls the on state of the second power transistor to keep the output of the second driving voltage constant. When the first enable signal is invalid, the second operational amplifier 2121 is controlled to output a voltage greater than or equal to the input voltage, so that Vgs of the second power transistor is positive, and the second power transistor is turned off, so that the second voltage regulator circuit 212 is turned off.
In particular, in this embodiment, the number of the second stabilizing circuits 212 is set to be plural, so that the driving circuit 200 can drive more external circuits to operate, and optionally, the number of the second stabilizing circuits 212 may be set to be 2.
Further, with reference to fig. 1, the driving circuit 200 further includes a second over-temperature protection circuit 220 for performing over-temperature protection on the driving circuit 200, and the second over-temperature protection circuit 220 is connected to the power switching circuit 300, the first stabilizing circuit 211 and the second stabilizing circuit 212.
Specifically, in this embodiment, the second over-temperature protection circuit 220 is connected to a power supply terminal of the second operational amplifier 2121, and detects a chip temperature when the driving circuit 200 operates, and when the chip temperature is too high (for example, higher than 150 ℃), the second over-temperature protection circuit 220 controls an output voltage of the second operational amplifier 2121 so that Vgs of the second power transistor is positive, and then the second power transistor is turned off, so that the second voltage regulator circuit 212 is turned off; when the chip temperature is reduced to a certain value (for example, lower than 110 ℃), the second over-temperature protection circuit 220 controls the second operational amplifier 2121 to turn on the second power tube, so that the second voltage stabilizing circuit 212 continues to work to supply power to the external device again; over-temperature protection of the driving circuit 200 is achieved.
Further, with reference to fig. 1, the driving circuit 200 further includes: and the battery under-voltage detection circuit is used for detecting whether the battery voltage is in an under-voltage state and outputting a battery under-voltage signal, and is connected with the battery BAT, the charging module and the power supply switching circuit 300. In this embodiment, the battery under-voltage detection circuit detects the battery voltage, and when the battery voltage is lower than a set voltage (for example, lower than 3V), the battery under-voltage signal is output to an external device (in this embodiment, the main control chip 30), and the main control chip 30 performs next circuit control, such as power supply shutdown, under-voltage state display, and the like, according to the battery under-voltage signal.
Further, with reference to fig. 1, the driving circuit 200 further includes: the first transistor Q2 is used for driving an external device, a first end of the first transistor Q2 is connected to a second enable signal, a second end of the first transistor Q2 is connected with the external device, and a third end of the first transistor Q2 is grounded. In this embodiment, the first transistor Q2 is a low impedance device when turned on, and can drive the external device of the power management chip 10 through a large current. The first transistor Q2 is controlled by a second enable signal: when the second enable signal is active, the first transistor Q2 is turned on, forming a low impedance path; when the second enable signal is inactive, the first transistor Q2 is turned off and assumes a high impedance state.
In particular, the first transistor Q2 is an NMOS transistor or a PMOS transistor, which can be selected according to the requirement. When the first transistor is an NMOS, the first terminal of the first transistor Q2 is a gate, the second terminal of the first transistor Q2 is a drain, and the third terminal of the first transistor Q2 is a source; when the first transistor is PMOS, the first terminal of the first transistor Q2 is gate, the second terminal of the first transistor Q2 is source, and the third terminal of the first transistor Q2 is drain.
The first transistor may be provided in plural, and may be added as needed, which is not limited herein.
Further, the power management chip 10 may be packaged into a chip structure as shown in fig. 4, in this embodiment, the power management chip 10 includes, but is not limited to, 12 pins.
Specifically, referring to fig. 1 to 4, the first pin of the power management chip 10 is a charging voltage output terminal (V _ CHG in the figure) for accessing the power voltage of the charger 20. The first pin is connected to the charging detection circuit 110, the charging switch Q1 and the power switching circuit 300 inside the power management chip 10.
The second pin of the power management chip 10 is a charging current setting terminal (IPROG in the figure) for setting a preset current through an external resistor. The second pin is connected to the trickle control circuit 130, the constant current control circuit 140 and the constant voltage control circuit 150 in the power management chip 10.
The third pin of the power management chip 10 is a ground terminal (GND in the figure) for grounding the chip.
The fourth pin of the power management chip 10 is a regulated output enable control terminal (LDO _ EN in the figure) for controlling the second voltage regulator circuit 212 to turn on and off. The fourth pin is connected to a plurality of second voltage stabilizing circuits 212 inside the power management chip 10.
The fifth pin of the power management chip 10 is a MOS transistor enable terminal (MO _ EN in the figure), and is configured to control the on and off of the first transistor Q2. The fifth pin is connected to the gate of the first transistor Q2 inside the power management chip 10.
The sixth pin of the power management chip 10 is a charging status signal output terminal (CHG _ CHK in the figure), and the charging mode detection circuit 120 outputs a charging status signal to an external device (e.g., the main control chip 30). The sixth pin is connected to the charging mode detection circuit 120 inside the power management chip 10.
The seventh pin of the power management chip 10 is a battery connection terminal (V _ BAT in the figure) for accessing the battery BAT, charging the battery BAT and detecting the battery status. The seventh pin is connected to a charging switch Q1, a battery under-voltage detection circuit, and a power switching circuit 300 inside the power management chip 10, and is also connected to an external battery BAT.
The eighth pin of the power management chip 10 is a battery under-voltage signal output end (BAT _ LV in the figure), and is configured to output a corresponding battery under-voltage signal to an external device (e.g., the main control chip 30) when detecting that the battery BAT is under-voltage. The eighth pin is connected with a battery under-voltage detection circuit inside the power management chip 10.
The ninth pin of the power management chip 10 is an uncontrollable regulated output (LDO 1 in the figure) that is used to supply power to external devices. The ninth pin is connected to the first voltage stabilizing circuit 211 inside the power management chip 10.
The tenth pin and the eleventh pin of the power management chip 10 are respectively a first controllable regulated voltage output terminal (LDO 2 in the figure) and a second controllable regulated voltage output terminal (LDO 3 in the figure), and the regulated voltage output is controllable and is controlled by the fourth pin of the power management chip 10 to supply power to an external device. The tenth pin and the eleventh pin are respectively connected to the corresponding second voltage stabilizing circuit 212 inside the power management chip 10.
The twelfth pin of the power management chip 10 is an MOS output terminal (MO in the drawing), and is configured to output a corresponding voltage when the first transistor Q2 is turned on. The twelfth pin is connected to an output terminal of the first transistor Q2 inside the power management chip 10.
It should be noted that the external pins of the power management chip 10 can be freely set according to the need, the pin positions and the pin number are not limited herein, and a user can select a corresponding functional module and a corresponding circuit to package according to the production need, so as to obtain the corresponding power management chip 10.
Referring to fig. 5, based on the power management chip 10, the present invention further provides an application circuit of the power management chip, including the power management chip 10, at least one external device, a charger 20 and a battery BAT; the power management chip is connected to the charger 20, the battery BAT, and an external device, respectively.
Specifically, in this embodiment, a feasible circuit can be formed by selecting a corresponding external device and the power management chip 10 according to the actual function to be implemented, and the user can match the external device according to the actual requirement, which is not described in detail herein.
Specifically, the external devices are respectively: a first capacitor C1, a second capacitor C2, a fifth resistor R5, a main control chip 30, a first external device 40, a second external device 50 and a third external device 60; the positive electrode of the output end of the charger 20 is connected with one end of the first capacitor C1, the power supply switching circuit 300 and the charging circuit 100, one end of the fifth resistor R5 is connected with the charging circuit 100, and the negative electrode of the charger 20, the other end of the first capacitor C1 and the other end of the fifth resistor R5 are all grounded; the positive electrode of the battery BAT is connected with one end of the second capacitor C2, the charging circuit 100 and the driving circuit 200, and the main control chip 30 is connected with the driving circuit 200; the driving circuit 200 is also connected to the first external device 40, the second external device 50, and the third external device 60.
As shown in fig. 5, for example, a first pin of the power management chip 10 is connected to one end of the first capacitor C1 and a positive electrode of the charger 20, a second pin of the power management chip 10 is connected to one end of the first resistor R1, and a negative electrode of the charger 20, the other end of the first capacitor C1, the other end of the first resistor R1 and a third pin of the power management chip 10 are all grounded; the fourth pin of the power management chip 10 is connected to the first enable output terminal of the main control chip 30, and the main control chip 30 outputs a first enable signal to the second voltage stabilizing circuit 212; the fifth pin of the power management chip 10 is connected to the second enable output terminal of the main control chip 30, and the main control chip 30 outputs a second enable signal to the first transistor Q2; the sixth pin of the power management chip 10 is connected to the mode detection end of the main control chip 30, and the charging mode detection circuit 120 outputs a charging state signal to the main control chip 30; a seventh pin of the power management chip 10 is connected to one end of the second capacitor C2 and the positive electrode of the battery BAT, and the other end of the second capacitor C2 and the negative electrode of the battery BAT are both grounded; the eighth pin of the power management chip 10 is connected to the under-voltage detection end of the main control chip 30, and the battery under-voltage detection circuit outputs a battery under-voltage signal to the main control chip 30 when detecting that the battery BAT is under-voltage; the ninth pin of the power management chip 10 is connected to the power end of the main control chip 30, and the first voltage stabilizing circuit 211 supplies power to the main control chip 30; the tenth pin and the eleventh pin of the power management chip 10 are respectively connected with a first external device 40 and a second external device 50, and respectively supply power to the first external device 40 and the second external device 50; the twelfth pin of the power management chip 10 is connected to a third external device 60 to implement a switch or a corresponding function.
Based on foretell power management chip 10, the utility model also provides an electronic equipment, include: the battery BAT, the application circuit of the power management chip and at least one external device are connected with the battery BAT and the external device respectively. Since the application circuit of the power management chip has been described in detail above, it is not described in detail here.
To sum up, the utility model provides a pair of power management chip and application circuit and electronic equipment thereof, include: a charging circuit for charging the battery; a driving circuit for driving an external device; the power supply switching circuit is used for switching the power supply to supply power to the driving circuit; a voltage reference circuit for providing a reference voltage; the charging circuit and the power supply switching circuit are connected with a charger and a battery, the driving circuit is connected with the power supply switching circuit and an external device, and the voltage reference circuit is respectively connected with the charging circuit and the driving circuit. The utility model integrates the charging circuit and the driving circuit, charges the battery and drives the external device; and the power supply switching of an external power supply and the battery is realized through the power supply switching circuit, the power is supplied to the driving circuit, and the charging and discharging management of the lithium battery is realized in the same chip.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (13)
1. A power management chip, comprising:
a charging circuit for charging the battery;
a driving circuit for driving an external device;
the power supply switching circuit is used for switching the power supply to supply power to the driving circuit;
a voltage reference circuit for providing a reference voltage;
the charging circuit and the power supply switching circuit are connected with a charger and a battery, the driving circuit is connected with the power supply switching circuit and an external device, and the voltage reference circuit is respectively connected with the charging circuit and the driving circuit.
2. The power management chip of claim 1, wherein the charging circuit comprises:
a charge detection circuit for detecting a power supply voltage and starting or stopping charging according to the power supply voltage;
a charging mode detection circuit for detecting a battery voltage at the start of charging and switching a charging mode according to the battery voltage;
a trickle control circuit for trickle charging the battery when switching to the trickle charge mode;
the constant current control circuit is used for performing constant current charging on the battery when the battery is switched to a constant current charging mode;
a constant voltage control circuit for constant voltage charging the battery when switching to the constant voltage charging mode;
a charge switch for powering the battery when on;
the charging detection circuit is connected with the charger, the charging mode detection circuit and the charging switch, the charging mode detection circuit is further connected with the trickle control circuit, the constant current control circuit and the constant voltage control circuit, the trickle control circuit, the constant current control circuit and the constant voltage control circuit are all connected with the charging switch, and the charging switch is further connected with the battery.
3. The power management chip according to claim 2, wherein the charging circuit further comprises a first over-temperature protection circuit for over-temperature protection of the charging circuit, and the first over-temperature protection circuit is connected to the trickle control circuit, the constant current control circuit, the constant voltage control circuit, the charging switch, and the charging detection circuit, respectively.
4. The power management chip of claim 1 or 3, wherein the driving circuit comprises: a power supply circuit for supplying power to an external device; the power supply circuit is connected with the first enabling signal and is connected with the voltage reference circuit, the power supply switching circuit and the external device.
5. The power management chip of claim 4, wherein the power supply circuit comprises:
the first voltage stabilizing circuit is used for supplying power to an external device;
a plurality of second voltage stabilizing circuits for supplying power to external devices;
the first voltage stabilizing circuit and the second voltage stabilizing circuit are both connected with the voltage reference circuit and an external device; the second voltage stabilizing circuit is also connected with the first enabling signal, and the second voltage stabilizing circuit is controlled to be switched on or switched off by the first enabling signal.
6. The power management chip of claim 5, wherein the driver circuit further comprises: and the second over-temperature protection circuit is used for performing over-temperature protection on the driving circuit and is connected with the power supply switching circuit, the first voltage stabilizing circuit and the second voltage stabilizing circuit.
7. The power management chip of claim 6, wherein the driver circuit further comprises: the battery under-voltage detection circuit is used for detecting whether the battery voltage is in an under-voltage state and outputting a battery under-voltage signal, and is connected with the battery, the charging module and the power supply switching circuit.
8. The power management chip of claim 7, wherein the driver circuit further comprises: the first end of the first transistor is connected with a second enabling signal, the second end of the first transistor is connected with the external device, and the third end of the first transistor is grounded.
9. The power management chip of claim 5, wherein the first voltage regulator circuit comprises a first operational amplifier circuit, a first current limiting control circuit, a first power transistor, a first resistor and a second resistor;
the inverting input end of the first operational amplifier circuit is connected with the voltage reference circuit, the non-inverting input end of the first operational amplifier circuit is connected with one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected with an external device and the drain electrode of the first power tube, the other end of the second resistor is grounded, the source electrode of the first power tube is connected with the power supply switching circuit, and the grid electrode of the first power tube is connected with the output end of the first operational amplifier circuit and the first current-limiting control circuit.
10. The power management chip of claim 5, wherein the second voltage regulator circuit comprises a second operational amplifier circuit, a second current limiting control circuit, a second power transistor, a third resistor and a fourth resistor;
the inverting input end of the second operational amplification circuit is connected with the voltage reference circuit, the non-inverting input end of the second operational amplification circuit is connected with one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected with an external device and the drain electrode of the second power tube, the source electrode of the second power tube is connected with the power supply switching circuit, the grid electrode of the second power tube is connected with the output end of the second operational amplification circuit and the current-limiting control circuit, and the enable end of the second operational amplification circuit is connected with the first enable signal and the current-limiting control circuit.
11. An application circuit of a power management chip, comprising the power management chip of claims 1-10, at least one external device, a charger, and a battery; the power management chip is respectively connected with the charger, the battery and an external device.
12. The application circuit of the power management chip according to claim 11, wherein the external devices are respectively: the first capacitor, the second capacitor, the fifth resistor, the main control chip, the first external device, the second external device and the third external device;
the positive electrode of the output end of the charger is connected with one end of the first capacitor, the power supply switching circuit and the charging circuit, one end of the fifth resistor is connected with the charging circuit, and the negative electrode of the charger, the other end of the first capacitor and the other end of the fifth resistor are all grounded;
the positive electrode of the battery is connected with one end of the second capacitor, the charging circuit and the driving circuit, and the main control chip is connected with the driving circuit;
the driving circuit is also connected to the first external device, the second external device, and the third external device.
13. An electronic device, comprising: a battery, an application circuit of the power management chip as claimed in any one of claims 1 to 12 and at least one external device, the application circuit of the power management chip being connected to the battery and the external device, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021477947.9U CN212909030U (en) | 2020-07-23 | 2020-07-23 | Power management chip and application circuit and electronic equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021477947.9U CN212909030U (en) | 2020-07-23 | 2020-07-23 | Power management chip and application circuit and electronic equipment thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212909030U true CN212909030U (en) | 2021-04-06 |
Family
ID=75293160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021477947.9U Active CN212909030U (en) | 2020-07-23 | 2020-07-23 | Power management chip and application circuit and electronic equipment thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212909030U (en) |
-
2020
- 2020-07-23 CN CN202021477947.9U patent/CN212909030U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9654005B2 (en) | Battery charge and discharge management circuit and electronic device thereof | |
| CN103454572B (en) | Battery analogue circuit | |
| MXPA05008887A (en) | Circuit and method of operation for an electrical power supply. | |
| JP2001178017A (en) | Battery pack and charging circuit therefor | |
| EP4068605A1 (en) | Terminal, power supply method therefor, and charge and discharge management circuit | |
| CN108964457A (en) | The embodiment of high-efficiency battery charger for electronic device | |
| US10897134B2 (en) | Electronic device | |
| TW201044745A (en) | Power control circuit and battery module comprising the same | |
| US20110025276A1 (en) | Charge control circuit | |
| CN108964447A (en) | The embodiment of high-voltage direct-current charging 2:1 switching capacitor converter | |
| US8344702B2 (en) | Battery having universal serial bus port | |
| CN111711251A (en) | Power management chip and application circuit and electronic equipment thereof | |
| CN212909030U (en) | Power management chip and application circuit and electronic equipment thereof | |
| US20080012427A1 (en) | Power converter with integral battery | |
| US20220294236A1 (en) | Battery system and operating method of electronic device including the same | |
| CN113676166B (en) | Battery low-voltage automatic cut-off circuit and working method thereof | |
| AU2007273166A1 (en) | Power converter with integral battery | |
| WO2022178856A1 (en) | Charging circuit and electronic device | |
| CN213072174U (en) | Power management integrated circuit and application circuit and electronic equipment thereof | |
| CN111934392A (en) | Power management integrated circuit and application circuit and electronic equipment thereof | |
| US11916478B2 (en) | Parallel charger circuit with battery feedback control | |
| KR20130062888A (en) | Power management system suitable for use with multi-series-cell batteries | |
| CN214543738U (en) | Charging circuit of battery | |
| Guo et al. | A fast charging system based on charging current dynamic adjustment method | |
| CN210092918U (en) | Electronic scale charging structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220112 Address after: 510000 room 304, building a, No. 18, Kexue Avenue, Huangpu District, Guangzhou, Guangdong Patentee after: Guangzhou Zhongji Guowei Electronic Technology Co.,Ltd. Address before: 518131 f1014, 10th floor, Tiangong International Security Electronic Plaza, Longsheng East Road, Minzhi street, Longhua District, Shenzhen City, Guangdong Province Patentee before: Shenzhen core Microelectronics Co.,Ltd. |
|
| TR01 | Transfer of patent right |