Power management circuit and satellite navigation signal receiving device

Abstract

The embodiment of the utility model provides a power management circuit and a satellite navigation signal receiving device. The power supply management circuit comprises a first battery, a second battery, a power supply input module, a first power supply management module, a second power supply management module, a power supply detection module and a power supply load module, and the power supply input module is connected in series with the first power supply management module, the second power supply management module and the power supply load module. The power detection module is connected with the power input module, the first power management module and the second power management module. The first power management module can select the battery with the high voltage to supply power to the circuit, the power detection module controls the second power management module to boost when the battery voltage is low, and circuit selection is carried out again. The battery power supply management circuit and the GNSS receiver are high in integration level and long in endurance time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to satellite navigation receiver technical field, concretely relates to a kind of power management circuit and satellite navigation signal receiving device. BACKGROUND

[0002] GNSS receiver is an important part of satellite navigation positioning system, is a kind of electronic measuring instrument capable of receiving and processing satellite signals, obtaining user position information, usually powered by lithium-ion battery. Since its working scene is mostly carrying equipment in the field, it cannot be charged in time in most cases, so the power management capability and endurance of the receiver directly affect its performance. In addition, the circuit design of the receiver power management circuit will affect the overall size of the receiver product, and the structure is too redundant, which will increase the volume of the receiver product. In summary, the existing traditional receiver has the following problems from the power supply and endurance angle:

[0003] 1. The receiver has low integration, which limits the miniaturization design.

[0004] 2. The battery power management scheme in the receiver is complex and single.

[0005] 3. The receiver directly uses lithium-ion battery pack discharge, which limits the product endurance to the original inherent capacity of the battery.

[0006] 4. The receiver is powered by a single battery, with limited total capacity, resulting in limited endurance. INVENTION CONTENTS

[0007] To solve the technical problems existing in the prior art, the utility model provides a power management circuit, which comprises: a battery, a power input module, a first power management module, a second power management module, a power load module and a power detection module. The power input module, the first power management module, the second power management module and the power load module are connected in series, and the power detection module is connected with the power input module, the battery and the second power management module.

[0008] In some embodiments, the power input module comprises: a DC power supply and a protection circuit, and the DC power supply supplies power to the power management circuit through the protection circuit.

[0009] The protection circuit detects the current input by the DC power supply to provide overvoltage protection, overcurrent protection, overtemperature protection, undervoltage protection, short circuit protection and electrostatic discharge protection for the power management circuit.

[0010] Optionally, the protection circuit uses a protection IC chip of TPD1S514 type from Texas Instruments company.

[0011] In some embodiments, the first power management module comprises: a first charge-discharge management chip, a second charge-discharge management chip, and a first power path management chip; a power input end of the first charge-discharge management chip is connected to a power output end of the power input module, the first charge-discharge management chip is connected in series with the first battery, a power input end of the second charge-discharge management chip is connected to the power output end of the power input module, and the second charge-discharge management chip is connected in series with the second battery; the first charge-discharge management chip and the second charge-discharge management chip are connected in parallel; and power output ends of the first charge-discharge management chip and the second charge-discharge management chip are connected to the first power path management chip.

[0012] Further, when the power input module is connected to the direct-current power supply, the first charge-discharge management chip charges the first battery, and the second charge-discharge management chip charges the second battery.

[0013] Optionally, the first battery and the second battery are 18650 lithium ion batteries or 21700 lithium ion batteries, the discharge interval of the battery is 3.0V-4.2V, and the average voltage is 3.6V.

[0014] Further, when the power input module is disconnected from the direct-current power supply, the first battery supplies power to the circuit via the first charge-discharge management chip, and the second battery supplies power to the circuit via the second charge-discharge management chip. At this time, the first power path management chip compares the voltage values input via the first charge-discharge management chip and the second charge-discharge management chip, and selects by turning off the MOS inside the control chip. The first power path management chip selects to consume the battery with a higher voltage value first, and switches to the other battery when it is under-voltage, with a difference threshold of 0.2V.

[0015] Optionally, the first power path management chip is a MAX14742 chip of Maxim Integrated Company.

[0016] In some embodiments, the second power management module comprises: a boost circuit and a second power path management chip, the first power path management chip, the boost circuit, and the second power path management chip are connected in series, and the first power path management chip and the second power path management chip are directly connected.

[0017] In some embodiments, the power detection module is a control unit, and the control unit samples the direct-current power supply, the first battery, and the second battery through an ADC.

[0018] In some embodiments, the control unit is connected to the first charge-discharge management chip, the second charge-discharge management chip, and the boost circuit.

[0019] Further, when the control unit monitors that the battery voltage is as low as 3.0V, the boost circuit is opened, and the boost circuit boosts the current output via the first power path management chip.

[0020] In some embodiments, the power output end of the second power path management chip is connected to the power load module.

[0021] Further, the second power path management chip compares the voltage input via the first power path management chip and the battery boost circuit, and preferentially consumes the input circuit with a higher voltage value to supply power.

[0022] In some embodiments, the power load module comprises a system power supply, a converter, a GNSS power supply, a human-computer interaction power supply, and a laser ranging power supply, and the system power supply supplies power to the GNSS power supply, the human-computer interaction power supply, and the laser ranging power supply via the converter.

[0023] Further, the converter realizes voltage reduction and power conversion by periodically switching on and off the switch tube, and provides stable voltage power supply.

[0024] The utility model also provides a satellite navigation signal receiving device, and the receiver comprises the power management circuit.

[0025] Compared with the prior art, the power management circuit and the satellite navigation signal receiving device have the following beneficial technical effects:

[0026] The battery power management circuit has high integration, and multiple functions such as power protection, power path management, charge and discharge management, and output voltage control are integrated while the circuit design is simplified. Double battery switching power supply is adopted, which greatly prolongs the working time of the product; in combination with the design of the boost circuit, the battery power can still work for a period of time under the condition of low battery power, effectively improving the utilization rate of the battery and the endurance of the system. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which form a part of the specification, illustrate embodiments of the present utility model and, together with the description, serve to explain the principles of the present utility model.

[0028] Referring to the drawings, the present utility model can be more clearly understood according to the following detailed description, wherein:

[0029] Figure 1 is a general structure schematic diagram of the power management circuit provided by the embodiment of the present utility model.

[0030] Figure 2 is a specific structure design diagram of each module of the power management circuit of the embodiment of the present utility model.

[0031] Figure 3 is a power supply detection module circuit design drawing of the embodiment of the utility model.

[0032] Figure 4 is a first power supply path management chip circuit design drawing of the embodiment of the utility model.

[0033] Figure 5 is a second power supply path management chip circuit design drawing of the embodiment of the utility model.

[0034] Figure 6 is a boost circuit design drawing of the embodiment of the utility model. DETAILED DESCRIPTION

[0035] The embodiment of the utility model will be described in detail in combination with the drawings of the specification.

[0036] The power management circuit provided by the utility model as shown in the figure comprises: Figure 1 a first battery 101, a second battery 102, a power input module 1, a first power management module 2, a second power management module 3, a power load module 4 and a power detection module 5, the power input module 1 is connected with the first power management module 2, the second power management module 3 and the power load module 4 in sequence, and the power detection module 5 is connected with the power input module 1, the first battery 101, the second battery 102 and the second power management module 3.

[0037] The battery in the power management circuit of the utility model adopts two single 18650 lithium ion batteries or 21700 lithium ion batteries, the discharge interval of the battery is 3.0V-4.2V, and the average voltage is 3.6V.

[0038] As shown in the figure, it is a circuit module schematic block diagram of an embodiment of the power management circuit of the utility model, specifically: Figure 2

[0039] The power input module 1 is composed of a direct current power supply 11 and a protection circuit 12, the direct current power supply 11 is connected with the protection circuit 12, and the power management circuit is powered. The protection circuit 12 detects the current input by the direct current power supply 11, when the voltage exceeds the set threshold value, the protection circuit 12 will cut off the circuit to prevent the high voltage from causing damage to the circuit and equipment; when the current exceeds the set threshold value, the protection circuit 12 will cut off the circuit to prevent the problem caused by overcurrent.

[0040] The power detection module 5 is a control unit 50.

[0041] As shown in the figure, it is a circuit module schematic block diagram of an embodiment of the power management circuit of the utility model, specifically: Figure 3 ​FIG. 1 is a schematic diagram of the circuit design of the power detection module 5 in some embodiments. Specifically, VBATA and VBATB are the voltage acquisition pins of the first battery and the second battery, respectively. By introducing the battery voltage into the amplifier TLV9152IDSGR, the battery voltage range is amplified to generate two ADC signals, ANA_BAT1_VOL and ANA_BAT2_VOL, respectively, which are provided to the control unit 50 to read the power status of the two batteries.

[0042] The first power management module 2 includes: a first charge and discharge management chip 21, a second charge and discharge management chip 22, and a first power path management chip 201; the power input end of the first charge and discharge management chip 21 is connected to the power output end of the power input module 1, the first charge and discharge management chip 21 is connected in series with the first battery 101, the power input end of the second charge and discharge management chip 22 is connected to the power output end of the power input module 1, and the second charge and discharge management chip 22 is connected in series with the second battery 102; the first charge and discharge management chip 21 and the second charge and discharge management chip 22 are connected in parallel; the power output ends of the first charge and discharge management chip 21 and the second charge and discharge management chip 22 are connected to the first power path management chip 21.

[0043] like Figure 4 Figure 2 shows the circuit design of the first power path management chip 201 in some embodiments. DV_R and DV are the input paths for the first battery 101 and the second battery 102, respectively, via the first charge-discharge management chip 21 and the second charge-discharge management chip 22. During discharge, this chip compares the voltages of the two batteries and selects which battery to use by controlling the internal MOS transistor (MOS) shutdown. The decision is based on the voltage value. The MAX14742 chip prioritizes the battery with the higher voltage and switches to the battery when it is undervoltage. The difference threshold is 0.2V.

[0044] The second power management module 3 includes: a boost circuit 301, a second power path management chip 302, the first power path management chip 201, the boost circuit 301, and the second power path management chip 302 are connected in series in sequence, and the first power path management chip 201 and the second power path management chip 302 are directly connected.

[0045] like Figure 5Figure 2 shows the circuit design of the second power path management chip 302 in some embodiments. VBOOST is the input path of the boost circuit 301, and VBAT_DV is the input path of the lithium-ion battery via the first power path management chip 201. During discharge, this chip can compare the voltage values ​​of the two paths and select which battery power path to use by controlling the internal MOS shutdown. The judgment condition is the voltage value. The MAX14742 chip will prioritize the path with the higher voltage value and switch when it is undervoltage. The difference threshold is 0.2V. Because this power system introduces an ADC monitoring circuit, software monitoring of the battery can also be used. When the battery is undervoltage, the boost circuit 301 is turned on to provide battery life.

[0046] The power output terminal of the second power path management chip 302 is connected to the power load module 4 .

[0047] The control unit 50 is connected to the first charge and discharge management chip and the second charge and discharge management chip respectively, and configures the registers of the first charge and discharge management chip and the second charge and discharge management chip through the IIC protocol.

[0048] like Figure 6 The figure shows a partial circuit design diagram of the boost circuit 301 in the embodiment. BOOST_EN is a switching signal controlled by the control unit 50, which controls the operating state of the boost circuit 301. Here, the software system determines whether to turn on this circuit based on the ADC sampling to determine whether the battery is undervoltage. VBATT is the original battery voltage, and VBOOST is the battery voltage after boosting. When this circuit is working, the battery can continue to supply power at low voltage, improving the system's battery life. Under normal circumstances, an 18650 lithium-ion battery will be undercharged when discharged to 3.0V. However, using this boost circuit will extend its discharge range, and the actual measured battery life is improved by 15%-20%.

[0049] In some embodiments, the power load module 4 includes a system power supply 41, a converter 42, a GNSS power supply 401, a human-machine interaction power supply 402, and a laser ranging power supply 403. The system power supply 41 supplies power to the GNSS power supply 401, the human-machine interaction power supply 402, and the laser ranging power supply 403 via the converter 42. The converter 42 provides stable voltage power by periodically switching the switch on and off to reduce voltage and convert power.

[0050] Some embodiments of the present invention also include a satellite navigation signal receiving device, and the power management circuit of the satellite navigation signal receiving device adopts one or more of the above embodiments.

[0051] The technical solution of the battery power management circuit provided by the present utility model has the following beneficial technical effects but is not limited to:

[0052] 1. The high-integration circuit control chip, in combination with the design of peripheral circuit architecture, simplifies the power management circuit as a whole, and also optimizes the size of the GNSS receiver to which the scheme is applied. At the same time, the functions of power protection, output voltage control, ADC sampling, etc. are realized in one overall circuit design concept.

[0053] 2. The adoption of double lithium-ion battery switching power supply improves the endurance of the system.

[0054] 3. The addition of a boost circuit to the power management circuit of the GNSS receiver enables the battery to maintain a certain endurance time under low battery level, avoiding the situation of sudden stop working due to low battery level.

[0055] 4. The addition of a converter to the power management circuit of the GNSS receiver enables the higher voltage value output by the boost circuit or power path management chip to be converted into a more stable voltage for the power supply load.

[0056] Thus far, the detailed description of the embodiments of the present application is provided. It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0057] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, all of them should be covered in the technical solution range of the present application claimed.

Claims

1. A power management circuit comprising: The first battery and the second battery are characterized in that they also include: a power input module, a first power management module, a second power management module, a power detection module and a power load module, the power input module is connected in series with the first power management module, the second power management module and the power load module, and the power detection module is respectively connected to the power input module, the first power management module and the second power management module.

2. The power management circuit according to claim 1, wherein: The power input module includes: a DC power supply and a protection circuit. The DC power supply supplies power to the first power management module via the protection circuit.

3. The power management circuit according to claim 1, wherein: The power detection module includes a control unit.

4. The power management circuit according to claim 3, wherein: The first power management module includes: a first charge and discharge management chip, a second charge and discharge management chip, and a first power path management chip; the power input end of the first charge and discharge management chip is connected to the power output end of the power input module, the first charge and discharge management chip is connected in series with the first battery, the power input end of the second charge and discharge management chip is connected to the power output end of the power input module, and the second charge and discharge management chip is connected in series with the second battery; the first charge and discharge management chip and the second charge and discharge management chip are connected in parallel; the first charge and discharge management chip and the second charge and discharge management chip are connected to the first power path management chip.

5. The power management circuit according to claim 4, wherein: The second power management module includes: a boost circuit and a second power path management chip. The boost circuit and the second power path management chip are both connected to the first power management module, the boost circuit is connected to the second power path management chip, and the second power path management chip is connected to the power load module.

6. The power management circuit according to claim 3, wherein: The control unit samples the power input module, the first battery, and the second battery through an ADC.

7. The power management circuit according to claim 5, wherein: The control unit is connected to the first charge and discharge management chip and the second charge and discharge management chip; the control unit is connected to the boost circuit.

8. The power management circuit according to claim 1, wherein: The power load module includes: a system power supply, a converter, a GNSS power supply, a human-computer interaction power supply, and a laser ranging power supply. The system power supply supplies power to the GNSS power supply, the human-computer interaction power supply, and the laser ranging power supply via the converter.

9. A satellite navigation signal receiving device, characterized in that: The satellite navigation signal receiving device comprises a power management circuit according to any one of claims 1-8.

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