Battery protection chip with shipping mode

Abstract

The embodiment of the invention provides a battery protection chip with a shipping mode, the battery protection chip is applied to electronic equipment, an application processor is deployed in the electronic equipment, and the battery protection chip is connected with the application processor and receives a characteristic signal generated by the application processor; the battery protection chip is configured to obtain the characteristic signal and analyze the characteristic signal to obtain characteristic information; comparing the feature information with a preset feature code, and judging whether the feature information contains the feature code or not; if yes, triggering the battery protection chip to enter a shipping mode to prohibit discharging, and controlling the battery protection chip to enter an extremely low power consumption state at the same time; the beneficial effects are that the power consumption is as low as possible in a shipping mode, and the number of chip pins is not increased.

Description

Technical Field

[0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a battery protection chip with a shipping mode. Background Art

[0002] At present, the battery protection circuit in the existing electronic equipment has a certain current consumption, and the application system also consumes power. Figure 1 As shown, the application system takes the mobile phone system as an example, in which BAT1 is a battery cell for storing energy, resistor R1 and capacitor C1 form a filtering and voltage stabilizing function to supply power to the VIN pin of the battery protection chip Prot, resistor Rs samples current information (including charging current and discharging current), MOS tubes MND and MNC are nmos tubes, which are used to control whether to prohibit or allow discharging and charging. When DO outputs a low level, MND can be controlled to be turned off to prohibit discharging. When CO outputs a low level, MNC can be controlled to be turned off to prohibit charging. When CO and DO are both high levels, MND and MNC are turned on at the same time, allowing charging and discharging at the same time. Resistor R2 is used to limit the current when the charging circuit is reversely connected to the battery end to protect the chip Prot, and the AP module is an application processor.

[0003] The application processor AP uses the deployed software to implement various functions. Even when it is turned off, the AP consumes several hundred microamperes of current. Some electronic products are shipped to distant countries by long-term shipping. During this period, the electronic products sometimes consume a lot of power, causing the battery to be exhausted. By the time the product arrives at the sales outlet, it may have run out of power. At this time, customers cannot turn on the product directly, which is a bad experience. Although there are now solutions for applying the shipping mode, they have the defect of adding special shipping pins. Summary of the invention

[0004] In view of the defects in the prior art, the present invention provides a battery protection chip with a shipping mode, which can achieve the lowest possible power consumption in the shipping mode without increasing the number of chip pins.

[0005] A battery protection chip with a shipping mode is applied to an electronic device, wherein an application processor is deployed in the electronic device, the battery protection chip is connected to the application processor, and receives a characteristic signal generated by the application processor;

[0006] The battery protection chip is configured as:

[0007] Acquire the characteristic signal and analyze it to obtain characteristic information;

[0008] Comparing the characteristic information with a preset characteristic code to determine whether the characteristic information contains the characteristic code;

[0009] If so, the battery protection chip is triggered to enter the shipping mode to prohibit discharging, and at the same time the battery protection chip is controlled to enter an extremely low power consumption state.

[0010] As a specific preferred embodiment of the present application, the battery protection chip includes a feature detection device, a first logic circuit and a second logic circuit;

[0011] The feature detection device is configured to: process the feature signal to obtain a corresponding output signal;

[0012] The second logic circuit is used for:

[0013] Compare the output signal with a preset feature code, and if the feature code is included, output a corresponding enable signal;

[0014] The first logic circuit is used for:

[0015] According to the received enable signal, the battery protection chip is set to enter the shipping mode, and each power consumption module is turned off to prohibit discharge.

[0016] As a specific preferred embodiment of the present application, the feature detection device uses a comparator, and the comparator processes the feature signal, specifically including:

[0017] receiving the characteristic signal and comparing it with a preset reference voltage;

[0018] Based on the voltage magnitude relationship between the two, a corresponding level signal is output as the output signal.

[0019] As a specific preferred embodiment of the present application, the feature detection device uses an analog-to-digital converter, and the analog-to-digital converter processes the feature signal, specifically including:

[0020] The characteristic signal is converted into a digital signal, and the digital signal is used as the output signal.

[0021] As a specific preferred embodiment of the present application, the battery protection chip is connected to the application processor via a switch device.

[0022] As a specific preferred embodiment of the present application, the battery protection chip further includes a charger detection module, and the charger detection module is used to:

[0023] If it is detected that a charger is inserted, the charger detection module outputs a level signal and transmits the level signal to the second logic module, so that the second logic module sets the enable signal to a low level, triggering the battery protection chip to exit the shipping mode.

[0024] As a specific preferred embodiment of the present application, the charger detection module is also used for:

[0025] The waveform characteristics when the charging voltage is connected or the charging current waveform characteristics are detected and transmitted to the second logic module. If the preset exit waveform characteristics are met, the enable signal is set to a low level through the second logic module to control the battery protection chip to exit the shipping mode.

[0026] As a specific preferred embodiment of the present application, the battery protection chip further includes a short circuit detection module, and the short circuit detection module is used to:

[0027] When a short circuit is detected and lasts longer than a preset delay time, the signal output of the battery protection chip is controlled by the first logic circuit to prohibit discharge.

[0028] As a specific preferred embodiment of the present application, the battery protection chip further includes an over-temperature detection module, and the over-temperature detection module is used to:

[0029] When it is detected that the chip temperature is too high, the first logic circuit controls the signal output of the battery protection chip and prohibits charging and discharging.

[0030] It can be seen from the above technical solution that the present invention provides a battery protection chip with a shipping mode, which parses the characteristic signal generated by the acquired application processor to obtain characteristic information; then compares the characteristic information with a preset characteristic code to determine whether the characteristic information contains the characteristic code; if so, triggers the battery protection chip to enter the shipping mode to prohibit discharge, and at the same time controls the battery protection chip to enter an extremely low power consumption state; thereby achieving the lowest possible power consumption in the shipping mode, and a simple design without increasing the number of chip pins. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0032] Figure 1 A circuit diagram of a battery protection circuit is provided as background technology.

[0033] Figure 2 A connection diagram of a battery protection chip with a shipping mode provided by an embodiment of the present invention.

[0034] Figure 3A schematic diagram of a characteristic signal provided by an embodiment of the present invention being a sine wave;

[0035] Figure 4 A schematic diagram of a characteristic signal provided by an embodiment of the present invention being a triangular wave;

[0036] Figure 5 A schematic diagram of the internal connections of a battery protection chip with a shipping mode provided by an embodiment of the present invention;

[0037] Figure 6 A connection diagram of an ADC module replacing a comparator in a battery protection chip with a shipping mode provided by an embodiment of the present invention;

[0038] Figure 7 A connection diagram of a charger detection circuit provided by an embodiment of the present invention;

[0039] Figure 8 A connection diagram for detecting according to CS node information provided by an embodiment of the present invention;

[0040] Fig. 9 A connection diagram using NPN is provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The embodiments of the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and the protection scope of the present invention cannot be limited thereto. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by those skilled in the art to which the present invention belongs.

[0042] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0043] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0044] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0045] It should be noted that, unless otherwise specified, the technical terms in this embodiment have the common meanings understood in the relevant technical field.

[0046] A battery protection chip with a shipping mode provided in an embodiment of the present invention is shown in FIG. Figure 2 , applied to an electronic device, wherein an application processor is deployed in the electronic device, the battery protection chip is connected to the application processor, and receives a characteristic signal generated by the application processor;

[0047] The battery protection chip is configured as follows:

[0048] Acquire the characteristic signal and analyze it to obtain characteristic information;

[0049] Comparing the characteristic information with a preset characteristic code to determine whether the characteristic information contains the characteristic code;

[0050] If so, the battery protection chip is triggered to enter the shipping mode to prohibit discharging, and at the same time the battery protection chip is controlled to enter an extremely low power consumption state.

[0051] It should be noted that this embodiment only describes some circuits related to the present invention, and actual applications also include circuit modules that implement other functions, which are omitted here to simplify the description;

[0052] First, the application processor AP controls MN1 to turn on, generates a characteristic current signal (that is, the characteristic signal) to discharge the battery; for example, in one embodiment, the application processor AP controls the discharge current to store a string of characteristic codes (the current waveform can be designed as a current waveform with any characteristics, refer to Figure 3 and Figure 4 , including sine wave, or triangular wave, etc.), the battery protection chip is represented by Prot, and the discharge current can be sampled through the resistor Rs and the characteristics contained therein can be analyzed;

[0053] The battery protection chip includes a VIN pin, a VSS pin, a CS pin, a DO pin, a CO pin and a VM pin; the characteristic signal is received through the CS pin in the existing battery protection chip, and there is no need to set a special shipping pin.

[0054] Further, the battery protection chip includes a feature detection device, a first logic circuit and a second logic circuit;

[0055] The feature detection device is configured to: process the feature signal to obtain a corresponding output signal;

[0056] The second logic circuit is used for:

[0057] Compare the output signal with a preset feature code, and if the feature code is included, output a corresponding enable signal;

[0058] The first logic circuit is used for:

[0059] According to the received enable signal, the battery protection chip is set to enter the shipping mode, and each power consumption module is turned off to prohibit discharge.

[0060] In this embodiment, refer to Figure 5 The battery management chip specifically includes a charging overvoltage detection module VOC, a discharging overvoltage detection module VOD, a discharging overcurrent detection module EDI, a charging overcurrent detection module ECI, an oscillator OSC, a comparator com, a reference voltage source VR1, a first logic circuit Logic1, a second logic circuit Logic2, a discharging drive circuit DRVD, and a charging drive circuit DRVC.

[0061] It should be noted that, for the convenience of description, the oscillator is represented by OSC, the comparator is represented by com, the charging overvoltage detection module is represented by VOC, the discharge overvoltage detection module is represented by VOD, the discharge overcurrent detection module is represented by EDI, the charging overcurrent detection module is represented by ECI, the first logic circuit is represented by Logic1, the second logic circuit is represented by Logic2, the discharge drive circuit is represented by DRVD, and the charging drive circuit is represented by DRVC.

[0062] In this embodiment, OC and Figure 2 CO has the same meaning as OD; Figure 2 The meaning of DO in is the same as that of

[0063] When working, when the charging overvoltage detection module VOC compares the cell voltage to be greater than the charging overvoltage protection threshold VH1 (for example, 4.375V), and continues to exceed the charging overvoltage protection delay time Toc (for example, 1 second), it is judged that a charging overvoltage state occurs, and its output signal controls the first logic circuit Logic1, and makes the OC signal low through the driving circuit DRVC, thereby realizing the charging protection function of prohibiting; when the discharge overvoltage detection module VOD compares the cell voltage to be less than the discharge overvoltage protection threshold VL1 (for example, 2.3V), and continues to exceed the charging overvoltage protection delay time Tod (for example, 50 milliseconds), it is judged that a discharge overvoltage state occurs, and its output signal controls the first logic circuit Logic1, and makes the OD signal low through the driving circuit DRVD, thereby realizing the discharging protection function of prohibiting; When the charging overcurrent detection module ECI compares the CS voltage to be lower than the charging overcurrent protection threshold VIC1 (for example, -50 mV), and continues to exceed the charging overcurrent protection delay time Teci (for example, 10 milliseconds), it is determined that a charging overcurrent state has occurred, and its output signal controls the first logic circuit Logic1, and makes the OC signal low through the driving circuit DRVC, thereby realizing the prohibition of the charging protection function; when the discharge overcurrent detection module EDI compares the CS voltage to be higher than the discharge overcurrent protection threshold VID1 (for example, +50 mV), and continues to exceed the discharge overcurrent protection delay time Tedi (for example, 10 milliseconds), it is determined that a discharge overcurrent state has occurred, and its output signal controls the first logic circuit Logic1, and makes the OD signal low through the driving circuit DRVD, thereby realizing the prohibition of the discharge protection function.

[0064] In application, the feature detection device has two implementation modes. One is that the feature detection device uses a comparator, and the comparator processes the feature signal, specifically including:

[0065] receiving the characteristic signal and comparing it with a preset reference voltage;

[0066] Based on the voltage magnitude relationship between the two, outputting a corresponding level signal as the output signal;

[0067] In this embodiment, the comparator com compares the CS signal with the reference voltage. When the CS signal exceeds the detection threshold (equal to the VR1 voltage, for example, +10mV), the comparator com outputs a high level; when the CS signal is lower than the detection threshold (equal to the VR1 voltage, for example, +10mV), the comparator com outputs a low level; at the same time, the comparator com can detect the current waveform of the characteristic current signal, and the second logic circuit compares the output signal of the comparator com with the set shipping mode characteristic signal (i.e., the characteristic code). If the shipping mode signal characteristics are met, the output ShipModeEN signal is a high level, the protection chip Prot is set to enter the shipping mode, each power-consuming module is turned off, and the OD signal is set to a low level to prohibit discharge.

[0068] Another method is that the feature detection device uses an analog-to-digital converter, and the analog-to-digital converter processes the feature signal, specifically including:

[0069] The characteristic signal is converted into a digital signal, and the digital signal is used as the output signal.

[0070] That is, with Figure 5 In comparison, an analog-to-digital converter is used instead of the comparator com. Figure 6 ADC is an analog-to-digital converter, which converts the CS analog signal into a digital signal IData. The logic2 module compares the characteristics of IData with the characteristics required for entering the shipping mode. If the set characteristics are met, the ShipModeEN signal is controlled to a high level, the control chip enters the shipping mode, reduces power consumption, and sets the OD signal to a low level. When applied, Logic2 can be an ARM-based processor, or it can be implemented with an MCU, or a customized logic circuit.

[0071] In another embodiment, the battery protection chip further includes a charger detection module, represented by ChgD in the accompanying drawings, including a charger detection circuit, and the charger detection module is used to:

[0072] If it is detected that a charger is inserted, the charger detection module outputs a level signal and transmits the level signal to the second logic module, so that the second logic module sets the enable signal to a low level, triggering the battery protection chip to exit the shipping mode.

[0073] The charger detection module is also used for:

[0074] The waveform characteristics when the charging voltage is connected or the charging current waveform characteristics are detected and transmitted to the second logic module. If the preset exit waveform characteristics are met, the enable signal is set to a low level through the second logic module to control the battery protection chip to exit the shipping mode.

[0075] That is, the waveform characteristics of VM or the charging current waveform characteristics when the charging voltage is connected are detected. If the set exit waveform characteristics are met (for example, the CIN signal contains a certain characteristic digital signal waveform), Logic2 compares and meets the exit shipping mode conditions, and the ShipModeEN signal is set to a low level through the second logic module Logic2 to control the protection chip to exit the shipping mode.

[0076] Reference Figure 7 , describes an implementation of a charger detection circuit (ChgD). It includes nmos tube MN1, current source Ib, and inverter inv. When the charger is inserted, VM becomes a voltage lower than VSS. When VM is lower than VSS-Vthn, where VSS is the VSS node voltage and Vthn is the threshold voltage of MN1 (e.g. 0.7V), the drain of MN1 becomes a low level, and after passing through the inverter inv, the chin signal is a high level.

[0077] In another implementation, Figure 5 compared to, Figure 8 A method for detecting charger access or charging current waveform information based on CS node information is provided. Figure 8 The ChgD module can be implemented using a comparator or an analog-to-digital converter.

[0078] Furthermore, the battery protection chip further includes a short circuit detection module, and the short circuit detection module is used to:

[0079] When a short circuit is detected and lasts longer than a preset delay time, the signal output of the battery protection chip is controlled by the first logic circuit to prohibit discharge.

[0080] The battery protection chip further includes an over-temperature detection module, which is used to:

[0081] When it is detected that the chip temperature is too high, the first logic circuit controls the signal output of the battery protection chip and prohibits charging and discharging.

[0082] The above scheme parses the characteristic signal generated by the acquired application processor to obtain characteristic information; then compares the characteristic information with a preset characteristic code to determine whether the characteristic information contains the characteristic code; if so, triggers the battery protection chip to enter the shipping mode to prohibit discharge, and at the same time controls the battery protection chip to enter an extremely low power consumption state; thereby achieving the lowest possible power consumption in the shipping mode, and a simple design without increasing the number of chip pins.

[0083] Furthermore, the battery protection chip is connected to the application processor via a switch device.

[0084] and Figure 2 Compared with reference Fig. 9 MN1 is replaced with NPN1. When the IO pin of AP outputs a high level, NPN1 is controlled to conduct, generating a current flowing from P+ through R3, NPN1 to P-. By controlling the waveform of IO, current signals with different waveforms can be generated.

[0085] In this embodiment, the output characteristic signal (current signal) is formed by a current mirror built into the AP. By controlling the output of the current mirror through a control module inside the AP, discharge currents with various characteristics can be achieved.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A battery protection chip with a shipping mode, applied to an electronic device, wherein an application processor is deployed in the electronic device, characterized in that: The battery protection chip is connected to the application processor and receives a characteristic signal generated by the application processor; The battery protection chip is configured as: Acquire the characteristic signal and analyze it to obtain characteristic information; Comparing the characteristic information with a preset characteristic code to determine whether the characteristic information contains the characteristic code; If so, the battery protection chip is triggered to enter the shipping mode to prohibit discharging, and at the same time the battery protection chip is controlled to enter an extremely low power consumption state.

2. A battery protection chip with shipping mode according to claim 1, characterized in that: The battery protection chip includes a feature detection device, a first logic circuit and a second logic circuit; The feature detection device is configured to: process the feature signal to obtain a corresponding output signal; The second logic circuit is used for: Compare the output signal with a preset feature code, and if the feature code is included, output a corresponding enable signal; The first logic circuit is used for: According to the received enable signal, the battery protection chip is set to enter the shipping mode, and each power consumption module is turned off to prohibit discharge.

3. A battery protection chip with shipping mode according to claim 2, characterized in that: The feature detection device uses a comparator, and the comparator processes the feature signal, specifically including: receiving the characteristic signal and comparing it with a preset reference voltage; Based on the voltage magnitude relationship between the two, a corresponding level signal is output as the output signal.

4. A battery protection chip with shipping mode according to claim 2, characterized in that: The feature detection device uses an analog-to-digital converter, and the analog-to-digital converter processes the feature signal, specifically including: The characteristic signal is converted into a digital signal, and the digital signal is used as the output signal.

5. The battery protection chip with shipping mode according to claim 1, characterized in that: The battery protection chip is connected to the application processor via a switch device.

6. A battery protection chip with shipping mode according to claim 2, characterized in that: The battery protection chip further includes a charger detection module, which is used to: If it is detected that a charger is inserted, the charger detection module outputs a level signal and transmits the level signal to the second logic module, so that the second logic module sets the enable signal to a low level, triggering the battery protection chip to exit the shipping mode.

7. A battery protection chip with shipping mode according to claim 6, characterized in that: The charger detection module is also used for: The waveform characteristics when the charging voltage is connected or the charging current waveform characteristics are detected and transmitted to the second logic module. If the preset exit waveform characteristics are met, the enable signal is set to a low level through the second logic module to control the battery protection chip to exit the shipping mode.

8. A battery protection chip with shipping mode according to claim 6 or 7, characterized in that: The battery protection chip further includes a short circuit detection module, which is used to: When a short circuit is detected and lasts longer than a preset delay time, the signal output of the battery protection chip is controlled by the first logic circuit to prohibit discharge.

9. A battery protection chip with shipping mode according to claim 8, characterized in that: The battery protection chip further includes an over-temperature detection module, which is used to: When it is detected that the chip temperature is too high, the first logic circuit controls the signal output of the battery protection chip and prohibits charging and discharging.

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