Continuously operating DC power supply

Abstract

The embodiment of the application provides a kind of endurance DC power supply, including: battery, charging circuit, power supply selection circuit, boost circuit and signal output circuit, charging circuit is located on charging panel, battery is connected on charging panel, boost circuit is located on boost panel, charging panel and boost panel are located on different mainboard;Wherein, charging circuit, for by the external power supply of the power input end of endurance DC power supply, battery is charged;Power supply selection circuit is used to select the input power supply of boost circuit from external power supply and battery according to power input state, wherein, power input state is used to indicate whether there is current input in power input end;Boost circuit is used to increase the output voltage of the input power supply of boost circuit to preset voltage, and power supply is carried out to the external device connected to boost panel;Signal output circuit is used to output analog ignition signal to external device according to power input state.

Description

Technical Field

[0001] This application relates to the field of automotive electronics technology, and more specifically, to a DC power supply for extended battery life. Background Technology

[0002] The typical solution for parking monitoring with a dashcam involves connecting the dashcam directly to the car battery and determining the car's ignition status via the ignition signal. When the car is on, the dashcam works normally; when the car is off, the dashcam enters parking monitoring mode. In both modes, the dashcam draws power directly from the car battery. In this case, the car battery needs to be continuously discharged, which poses a risk of damaging the car battery.

[0003] Therefore, it is evident that the power supply solutions for automotive components in related technologies pose a risk of power supply damage. Utility Model Content

[0004] This application provides a DC power supply for extended driving, which at least addresses the problem of power supply damage risks in the power supply solutions for automotive components in related technologies.

[0005] According to one aspect of the embodiments of this application, a continuous-use DC power supply is provided, comprising: a battery, a charging circuit, a power selection circuit, a boost circuit, and a signal output circuit. The charging circuit is located on a charging board, the battery is connected to the charging board, and the boost circuit is located on a boost board. The charging board and the boost board are located on different motherboards. The charging circuit is used to charge the battery through an external power source connected to the power input terminal of the continuous-use DC power supply. The power selection circuit is used to select the input power source of the boost circuit from the external power source and the battery according to the power input state, wherein the power input state indicates whether there is current input at the power input terminal. The boost circuit is used to boost the output voltage of the input power source to a preset voltage and supply power to an external device connected to the boost board. The signal output circuit is used to output a simulated ignition signal to the external device according to the power input state.

[0006] In one exemplary embodiment, the extended-range DC power supply further includes: a power protection circuit connected between the power input terminal and the charging circuit, for monitoring and controlling a first parameter of the power input terminal, wherein the first parameter includes at least one of the following: voltage, current, and temperature.

[0007] In one exemplary embodiment, the extended-range DC power supply further includes: a battery protection circuit located between the charging circuit and the battery, for monitoring and controlling a second parameter during the charging process of the battery, wherein the second parameter includes at least one of the following: voltage, current, and temperature.

[0008] In an exemplary embodiment, the battery protection circuit is further located between the battery and the power selection circuit, and the battery protection circuit is also used to monitor and control the second parameter during the discharge process of the battery in order to protect the discharge process of the battery.

[0009] In one exemplary embodiment, the charging circuit includes: a first charging control component and a second charging control component connected in parallel, for detecting the charging state of the battery.

[0010] In an exemplary embodiment, the charging circuit further includes a charging indicator light connected to the first charging control component for indicating the charging status of the battery, wherein the current flowing through the first charging control component is lower than the current flowing through the second charging control component, the charging indicator light is in a first state when the battery cannot be charged through the first charging control component, and in a second state when the battery is charged through the first charging control component.

[0011] In one exemplary embodiment, the power selection circuit includes an ideal diode, and the power selection circuit is further configured to control the input power supply of the selected boost circuit based on the on / off state of the ideal diode.

[0012] In one exemplary embodiment, the extended-range DC power supply further includes: a charging control chip integrated at the power input terminal for adjusting the input current at the power input terminal, wherein the charging control chip is a fast-charging chip based on a power transfer fast charging protocol.

[0013] In one exemplary embodiment, the signal output circuit is further configured to output a high-level signal to the external device when there is a power input at the power input terminal, and to output a low-level signal to the external device when there is no power input at the power input terminal.

[0014] In one exemplary embodiment, the power input terminal is used to connect to the car cigarette lighter, the external power source is the car power supply, the external device is a dashcam, and the battery is a lithium iron phosphate battery.

[0015] This application provides a continuous-use DC power supply, comprising: a battery, a charging circuit, a power selection circuit, a boost circuit, and a signal output circuit. The charging circuit is located on a charging board, the battery is connected to the charging board, and the boost circuit is located on a boost board. The charging board and the boost board are located on different motherboards. The charging circuit charges the battery using an external power source connected to the power input terminal of the continuous-use DC power supply. The power selection circuit selects the input power source for the boost circuit from the external power source and the battery based on the power input status, wherein the power input status indicates whether there is current input at the power input terminal. The boost circuit boosts the output voltage of the input power source to a preset voltage and then outputs a signal to the boost circuit. The board supplies power to external devices. The signal output circuit outputs a simulated ignition signal to these devices based on the power input status. Since the presence of current at the power input terminal can be detected to determine if the car is in ignition mode, a corresponding ignition signal is simulated and output to the external devices. When the car is ignited, the car supplies power to the external devices; when the car is off, the built-in battery in the DC power supply provides power. This allows power to be supplied to external devices even when the car is off, without connecting to the car battery. This solves the problem of power supply damage risks associated with power supply schemes for automotive components in related technologies and improves the safety of power supplies for automotive components while the car is off. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a DC power supply for extended battery life according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of an optional DC power supply for extended battery life according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of an optional boost circuit according to an embodiment of this application;

[0019] Figure 4 This is a schematic diagram of an optional battery protection circuit according to an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of an optional charging circuit according to an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of an optional power selection circuit according to an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of another optional DC power supply for extended battery life according to an embodiment of this application;

[0023] Figure 8This is a schematic diagram of an optional signal output circuit according to an embodiment of this application;

[0024] Figure 9 This is a schematic diagram of an optional extended-range DC power supply according to an embodiment of this application;

[0025] Figure 10 This is a schematic diagram illustrating the usage process of an optional DC power supply for extended battery life according to an embodiment of this application.

[0026] Figure 11 This is a schematic diagram of another optional DC power supply for extended battery life according to an embodiment of this application. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] According to one aspect of the embodiments of this application, a power supply for extended battery life is provided. Figure 1 This is a schematic diagram of an optional DC power supply for extended battery life according to an embodiment of this application, as shown below. Figure 1As shown, the extended-range DC power supply 101 may include: a battery 102, a charging circuit 103, a power selection circuit 104, a boost circuit 105, and a signal output circuit 106. The charging circuit 103 is located on a charging board 107, the battery 102 is connected to the charging board 107, and the boost circuit 105 is located on a boost board 108. The charging board 107 and the boost board 108 are located on different motherboards. The charging circuit 103 is used to charge the battery 102 through an external power supply 110 connected to the power input terminal 109 of the extended-range DC power supply. Charging; power selection circuit 104 is used to select the input power of boost circuit 105 from external power supply 110 and battery 102 according to the power input status, wherein the power input status is used to indicate whether there is current input at power input terminal 109; boost circuit 105 is used to boost the output voltage of input power supply of boost circuit 105 to a preset voltage and supply power to external device 111 connected to boost board 108; signal output circuit 106 is used to output a simulated ignition signal to external device 111 according to power input status.

[0030] The DC power supply in this embodiment can be applied to the field of automotive electronics technology, specifically to scenarios that power automotive components. Taking a dashcam as an example, a dashcam is a video recording device installed in a car to record road conditions, vehicles ahead, pedestrians, and other visual data, as well as sound information in the driving environment.

[0031] A car's ignition system generates a specific electrical signal during ignition, called the ACC signal (Accessory Signal, also known as the ignition signal). The ACC signal is typically high, indicating that the car is ignited. When the car is turned off, the ACC signal goes low. A dashcam can have a built-in signal detection circuit to monitor the ACC signal in real time. Its ACC pin can receive electrical signals and be used to detect the vehicle's ignition or shutdown signals. When the car is ignited, the dashcam works normally. When the car is turned off, the dashcam enters parking monitoring mode. In parking monitoring mode, the dashcam reduces power consumption and retains only essential functions.

[0032] In related technologies, the parking monitoring solution for dashcams generally involves directly connecting the dashcam to the car battery and drawing power directly from it. However, since dashcams still consume some power in parking monitoring mode, if the parking monitoring time is too long or the battery capacity is small, it may cause the battery to over-discharge, thereby damaging the battery and affecting the car's starting.

[0033] Therefore, it is evident that the power supply solutions for automotive components in related technologies pose a risk of power supply damage.

[0034] To at least partially solve the aforementioned technical problems, this embodiment proposes a continuous-use DC power supply, comprising: a battery, a charging circuit, a power selection circuit, a boost circuit, and a signal output circuit. The charging circuit is located on a charging board, the battery is connected to the charging board, and the boost circuit is located on a boost board. The charging board and the boost board are located on different motherboards. The charging circuit is used to charge the battery through an external power source connected to the power input terminal of the continuous-use DC power supply. The power selection circuit is used to select the input power source for the boost circuit from the external power source and the battery based on the power input status, wherein the power input status indicates whether there is current input at the power input terminal. The boost circuit is used to boost the output voltage of the input power source of the boost circuit to a higher voltage. The system presets the voltage and supplies power to external devices connected to the boost converter. The signal output circuit outputs a simulated ignition signal to the external devices based on the power input status. Since the presence of current at the power input terminal can be detected to determine if the car is in an ignition state, a corresponding ignition signal is simulated and output to the external devices. When the car is ignited, the car supplies power to the external devices; when the car is off, the battery built into the DC power supply supplies power. This allows power to be supplied to external devices even when the car is off, without connecting to the car battery. This solves the problem of power supply damage risks associated with power supply schemes for automotive components in related technologies and improves the safety of the power supply for automotive components.

[0035] Here, the car power supply can be connected to the power input terminal of the extended DC power supply as an external power source. When the car is started, the car power supply can charge the battery through the power input terminal of the extended DC power supply.

[0036] Optionally, the aforementioned extended-range DC power supply may have a built-in detection component for detecting voltage changes at the power input terminal to determine the power input status. The power input status indicates whether there is current input at the power input terminal. Here, a power input threshold may be preset. When the voltage input at the power input terminal reaches or exceeds the power input threshold, the power input status may indicate that there is current input at the power input terminal. When the voltage input at the power input terminal is lower than the power input threshold, the power input status may indicate that there is no current input at the power input terminal.

[0037] In this embodiment, considering that the circuit board will generate heat, in order to ensure the safety performance of the aforementioned DC power supply, the battery and circuit board can be arranged as follows: Figure 2As shown, the charging circuit is located on the charging board, the battery is connected to the charging board, and the boost circuit is located on the boost board. The charging board and the boost board are located on different motherboards. By separating the battery from the circuit board and connecting it to the charging board only through pins, the battery can be kept away from the heat source, and the heat conduction between the circuit boards can be reduced. This can effectively reduce the temperature of the battery, reduce the thermal impact, and avoid the adverse effects on the battery caused by the heat generated by the boost circuit.

[0038] In addition, placing the charging circuit and the boost circuit on different motherboards can reduce electrical interference and avoid unnecessary voltage fluctuations caused by the charging current in the boost circuit, thereby improving the stability and efficiency of the DC power supply.

[0039] Optionally, the charging board and the boost board can be connected, so that the battery can be used as the input power source for the boost circuit.

[0040] Optionally, the external devices can be powered by the vehicle's power supply or by the aforementioned battery, depending on the power input state. That is, the external devices can be powered by the vehicle's power supply when there is a current input from the vehicle's power supply, and by the aforementioned battery when there is no current input from the vehicle's power supply. Furthermore, when the vehicle is turned off, the external devices are powered by the battery, eliminating the need to continuously draw power from the vehicle battery to provide power to the vehicle components while it is stationary. This can improve the lifespan of the vehicle battery and reduce the risk of damage to the vehicle's power supply.

[0041] Optionally, whether the external device is powered by the vehicle's power supply or by the aforementioned battery, the voltage can be boosted by the boost circuit before powering the external device.

[0042] For example, when the car is started, the power selection circuit can send external power from the power input terminal to the boost circuit, and at the same time the charging circuit starts charging the battery. After the car is turned off, the power selection circuit switches to battery power.

[0043] Optionally, the boost circuit can be used to boost the output voltage of the input power supply of the boost circuit to a preset voltage and supply power to the external devices connected to the boost board. Here, the preset voltage can be the operating voltage of the external devices. The boost circuit can be used to output a stable operating voltage required by the external devices to ensure that the external devices can work stably under different input power conditions.

[0044] For example, such as Figure 3As shown, the boost circuit may include a conversion chip U5 for controlling the conversion of the input power supply (such as 5V USB power) to a higher voltage (e.g., 12V) required by external devices; a diode SS34 to prevent reverse current flow and ensure that energy flows only from the input to the output; and an inductor L1 for storing and releasing energy to achieve voltage conversion. During the switching cycle of the circuit, when the switch is on, the inductor stores energy; when the switch is off, the inductor releases energy to the output, helping to boost the output voltage in the boost circuit. The U5 chip, by controlling the switches, inductors, and diodes in the circuit, can convert the low-voltage input current into a high-voltage DC current output. In addition, capacitors and resistors can be added to the boost circuit to ensure clean power supply and stable circuit operation.

[0045] In this embodiment, the aforementioned DC power supply for extended driving may further include a signal output circuit for outputting a simulated ignition signal to an external device based on the power input state. Then, based on the simulated ignition signal, the external device can determine whether the car is in an ignition state and switch functions accordingly. For example, when the simulated ignition signal indicates that the car is in an ignition state, the external device works normally, and when the simulated ignition signal indicates that the car is in an off state, the external device enters a power-saving mode.

[0046] The embodiments provided in this application provide a power supply for extended driving, comprising: a battery, a charging circuit, a power selection circuit, a boost circuit, and a signal output circuit. The charging circuit is located on a charging board, the battery is connected to the charging board, and the boost circuit is located on a boost board. The charging board and the boost board are located on different motherboards. The charging circuit charges the battery using an external power source connected to the power input terminal of the power supply. The power selection circuit selects the input power source for the boost circuit from the external power source and the battery based on the power input status, wherein the power input status indicates whether there is current input at the power input terminal. The boost circuit boosts the output voltage of the input power source to a preset voltage and supplies power to external devices connected to the boost board. The signal output circuit outputs a simulated ignition signal to external devices based on the power input status. This solution addresses the risk of power supply damage in related automotive component power supply schemes and improves the safety of power supplies for automotive components.

[0047] In one exemplary embodiment, the aforementioned power supply for extended battery life further includes:

[0048] A power protection circuit, connected between the power input terminal and the charging circuit, is used to monitor and control a first parameter of the power input terminal, wherein the first parameter includes at least one of the following: voltage, current, and temperature.

[0049] In this embodiment, a power protection circuit can be set between the power input terminal and the charging circuit to protect the aforementioned DC power supply and prevent the instability of the external input power supply from damaging the internal circuit.

[0050] When the voltage input from the power input terminal is too high, it may damage the battery, or even cause the battery to overheat or explode. If the voltage is too low, it may not be able to charge effectively. Based on this, the power protection circuit may include a voltage detection module. Once the voltage is detected to be outside the preset range, corresponding measures can be taken, such as cutting off the power input. The voltage detection module may include a comparator and a voltage divider network, or other circuit settings. This embodiment does not limit the specific circuit settings.

[0051] Similarly, during charging, excessive current may cause the battery to overheat or overcharge, affecting battery life and creating safety hazards. The power protection circuit can also be used to monitor and control the current at the power input terminal, i.e., the current entering the charging circuit, to ensure that it does not exceed the maximum safe charging current value of the battery. For example, when the current at the power input terminal exceeds the safe charging current of the battery, the current can be cut off to prevent overcharging. The current detection process in the power protection circuit can be implemented by connecting a sampling resistor in series in the charging path, using the voltage difference generated across the resistor to reflect the current magnitude. Other circuit settings are also possible, and this embodiment does not limit this.

[0052] Similarly, during battery charging, there may be certain temperature changes. Excessively high temperatures will accelerate battery aging, while excessively low temperatures may lead to a decrease in charging efficiency. Based on this, the power protection circuit can also be used to monitor and control the temperature of the power input terminal and take corresponding measures. For example, once the battery temperature exceeds the safe range, the power input can be cut off. The temperature can be monitored by a temperature sensor (such as a thermistor). This embodiment does not limit this.

[0053] Optionally, the power protection circuit can monitor only one parameter of the power input terminal, such as voltage, current, and temperature, or it can comprehensively consider and monitor these parameters.

[0054] Optionally, when the power protection circuit detects an abnormality in the first parameter of the power input terminal, it can send a signal to the charging circuit to instruct it to stop or adjust the charging process.

[0055] This embodiment demonstrates how a power protection circuit can be installed between the power input terminal and the charging circuit to improve the safety of a continuous DC power supply.

[0056] In one exemplary embodiment, the aforementioned extended-range DC power supply further includes:

[0057] A battery protection circuit, located between the charging circuit and the battery, is used to monitor and control a second parameter during the battery charging process, wherein the second parameter includes at least one of the following: voltage, current, and temperature.

[0058] In this embodiment, the aforementioned DC power supply can include a battery protection circuit between the charging circuit and the battery to protect the battery during the charging process, ensuring that the battery operates within its safe range and preventing damage to the battery.

[0059] Optionally, the battery protection circuit described above can be used to monitor and control the voltage during the battery charging process to prevent overcharging and over-discharging. Overcharging can lead to increased internal pressure in the battery, which may cause the battery to swell, electrolyte to leak, or even explode. By setting a circuit for voltage detection between the battery and the charging circuit, the battery voltage can be compared with a preset threshold in real time. Once it exceeds the safe range, the charging path can be cut off.

[0060] Similarly, to prevent excessive current from causing battery temperature to rise, internal short circuits, or reduced battery life, battery protection circuits can also be used for current or temperature detection.

[0061] Optionally, the battery protection circuit can monitor one of the parameters—voltage, current, and temperature—during the battery charging process, or it can comprehensively consider and monitor these parameters.

[0062] Optionally, when the battery protection circuit detects an abnormality in the battery charging process, it can take corresponding measures, such as cutting off the battery charging path.

[0063] In this embodiment, by setting a battery protection circuit between the charging circuit and the battery, the charging process of the battery can be protected, thereby improving the safety of the battery and the DC power supply for extended use.

[0064] In one exemplary embodiment, the battery protection circuit is also located between the battery and the power selection circuit, and the battery protection circuit is also used to monitor and control a second parameter during the battery discharge process.

[0065] In this embodiment, in addition to monitoring and controlling the charging process of the battery, the battery protection circuit can also be located between the battery and the power selection circuit to monitor and control some or all of the parameters of voltage, current and temperature during the battery discharge process, so as to protect the battery discharge process and prevent over-discharge from reducing battery capacity and shortening cycle life.

[0066] Optionally, if the second parameter is abnormal during the battery discharge process, the battery protection circuit can be used to control the battery discharge process, for example, by cutting off the battery discharge path.

[0067] For example, such as Figure 4 As shown, the battery protection circuit may include a first protection chip U1 and a second protection chip U3. U1 is used to detect parameters during the battery charging process. Its TD pin can be connected to a temperature sensor to monitor the battery temperature to prevent overheating. Its overcharge detection (OC) pin can be used to monitor whether the battery voltage reaches the overcharge voltage threshold. Its over-discharge detection (OD) pin can be used to monitor whether the battery voltage is lower than the over-discharge voltage threshold. Its current detection (Current...) The Sense (CS) pin can be used to monitor the charging and discharging current to ensure it is within a safe range. It can also include a filter composed of resistor R1 and capacitor C1. U1 can send a signal to U3 based on the detected parameters. In response to the battery charging control signal sent by U1, it can control the charging and discharging path of the battery. For example, when a signal allowing charging is received, G1 and G2 can control the MOSFETs on S1 and S2 (source pins) connected to them to turn on, allowing the battery to charge or discharge. When a signal indicating abnormal parameters during the battery charging process is received, the MOSFETs on S1 and S2 can be turned off, cutting off the charging and discharging path of the battery. G1, S1 and G2, S2 can be used to control the corresponding MOSFETs for the battery's discharge path and charging path, respectively.

[0068] In this embodiment, by setting a battery protection circuit between the charging circuit and the battery, the battery discharge process can be protected, thereby improving the safety of the battery and the DC power supply for extended use.

[0069] In one exemplary embodiment, the charging circuit includes: a first charging control component and a second charging control component connected in parallel, for detecting the charging state of the battery.

[0070] In this embodiment, the charging circuit can be used to convert the power input from the power input terminal into current and voltage suitable for the battery, detect the charging state of the battery, and adjust the power input to the battery based on the charging state of the battery.

[0071] Optionally, the charging status of the battery can be detected by a first charging control unit and a second charging control unit connected in parallel. Here, for a charging scheme that performs linear charging of the battery, the charging current may be large, for example, the charging current can reach 700mA, which may cause overheating. Based on this, the first charging control unit and the second charging control unit connected in parallel can use two parallel charging paths to allow each control unit to independently receive current from the input power supply and deliver it to the charging pin of the battery. In this way, the battery can receive current in parallel through two pins, reducing the current burden on each pin and also reducing the load and heat generated by each control unit.

[0072] Optionally, the first charging control unit and the second charging control unit can be used to detect the charging state of the battery and adjust the charging voltage and current according to the charging state of the battery. For example, they can be used to monitor the battery voltage or current to determine the charging state of the battery. When the battery is not fully charged, the battery is charged with the maximum safe current and the battery voltage will gradually increase during the charging process. When the battery is about to be fully charged, it can enter the trickle charging mode, that is, charge the battery with only a very small current (for example, charge with one-tenth of the maximum safe current) until it is impossible to continue charging the battery.

[0073] Optionally, the determination of the battery charging status can be based on the detection of the battery voltage. For example, for a battery with a full charge voltage of 3.65V, it can be determined that the battery is not fully charged when its voltage is below 3.6V, that the battery is about to be fully charged when its voltage reaches 3.6V, and that the battery is fully charged when it can no longer be charged.

[0074] In this embodiment, by using parallel control components to detect and control the charging status of the battery, the heat generated by the control components can be reduced, thereby improving the safety and lifespan of the extended-range DC power supply.

[0075] In one exemplary embodiment, the charging circuit further includes a charging indicator light connected to the first charging control component for indicating the charging state of the battery, wherein the current flowing through the first charging control component is lower than the current flowing through the second charging control component, the charging indicator light is in a first state when the battery cannot be charged by the first charging control component, and in a second state when the battery is charged by the first charging control component.

[0076] In this embodiment, a charging indicator light can be connected to the first charging control component. A corresponding signal can be output through the pin connected to the charging indicator light to indicate the charging status. For example, when the battery is fully charged, the first charging control component may output a high-level signal to the charging indicator light through the pin, causing the charging indicator light to illuminate.

[0077] Optionally, the first charging control unit can determine the charging state of the battery by monitoring the battery voltage and output different signals at different charging stages. For example, different full-charge voltages (i.e., preset voltage thresholds) can be preset for different batteries. When the battery voltage is higher than the preset voltage threshold, the first charging control unit can output a high-level signal, and the charging indicator light is in a first state. When the battery voltage is not higher than the preset voltage threshold, the first charging control unit can output a low-level signal, and the charging indicator light is in a second state.

[0078] Optionally, the current flowing through the charging control component can be controlled by a resistor connected to the charging control component, for example, such as... Figure 5 As shown, by setting the resistance values ​​of resistors R12 and R3 connected to the first charging control component U2 and R7 connected to the second charging control component U4, the charging current of the two charging paths can be preset. When the resistance values ​​of R12 and R3 are set higher than the resistance value of R7, the charging current flowing through U2 can be lower than the charging current flowing through U4. Correspondingly, when the battery is about to be fully charged (for example, for a battery with a full charge voltage of 3.65V, it is judged that the battery is about to be fully charged when its voltage reaches 3.6V), U2 and U4 can enter trickle charging mode and adjust the corresponding charging path current (for example, adjust them to one-tenth of the original charging path current). Then, if the second charging control component can no longer charge the battery, the first charging control component can still continue to charge the battery with a smaller current. If the first charging control component can no longer continue to charge the battery, the first charging control component sends a signal to the charging indicator light, which lights up to indicate that the battery is fully charged. Based on this, the charging indicator light provides a more accurate indication of the battery's charging status.

[0079] This embodiment demonstrates how setting the charging current for different charging paths can improve the accuracy of the charging indicator light's indication.

[0080] In one exemplary embodiment, the power selection circuit includes: an ideal diode, and a power selection circuit further configured to control the input power supply of the selected boost circuit based on the on / off state of the ideal diode.

[0081] Here, an ideal diode refers to a component that can simulate the characteristics of an ideal diode. It can include a MOSFET, which can provide extremely low resistance when forward biased (i.e., its on-resistance is much lower than that of a traditional diode), thereby reducing voltage drop and heat generation, and provide high resistance when reverse biased to quickly turn off the MOSFET and achieve reverse cutoff, thereby achieving the effect of an ideal diode. Compared with a traditional diode, it can reduce energy loss in the on and off states and improve the speed and immediacy of power switching.

[0082] In this embodiment, the ideal diode can detect the input power supply voltage. By comparing the voltages at the two input terminals, the input power supply of the selected boost circuit can be controlled, that is, the power supply to the boost circuit can be determined.

[0083] Optionally, based on the detection results of the input power supply and preset logic rules, the ideal diode chip can turn on or off the internal MOSFET to achieve power switching.

[0084] For example, such as Figure 6 As shown, assuming the ideal diode U6 has two control input pins, VIN1 is connected to the power input terminal and VIN2 is connected to the battery. The boost circuit can select one of these two power sources as its input. Resistors R1 and R2 can be connected to the VIN1 and VIN2 interfaces respectively for voltage division and detection of their respective voltages. When the car is started, the voltage of VIN1 (i.e., the power input terminal) is higher than that of VIN2 (the battery power source). After detecting this, the ideal diode chip can control its internal MOSFET to turn on the power path of VIN1 and turn off the path of VIN2. Thus, the boost circuit can receive input power only from VIN1. When the car is turned off, the voltage of VIN1 drops below that of VIN2. The chip can correspondingly control its internal MOSFET to switch, turning on the power path of VIN2 and turning off the path of VIN1. The boost circuit then receives input power only from VIN2, i.e., the battery is used as the input power source.

[0085] Optionally, the ideal diode can also change its on / off state through an external control signal. For example, a detection circuit for the power input state at the power input terminal can be set up, and the MOSFET can be turned on or off based on the signal command fed back by the detection circuit to realize the power switching of the boost circuit. This embodiment does not limit this.

[0086] In this embodiment, by controlling the input power supply of the selected boost circuit based on the switching of an ideal diode, energy loss during power switching can be reduced, and the performance of the extended-range DC power supply can be improved.

[0087] In one exemplary embodiment, the aforementioned extended-range DC power supply further includes:

[0088] The charging control chip is connected between the power input terminal and the external power source to regulate the input current at the power input terminal. The charging control chip is a fast charging chip based on the power transfer fast charging protocol.

[0089] Here, Power Delivery (PD) is a standardized fast charging technology primarily used for USB Type-C interface devices. It allows devices to dynamically negotiate power supply to provide higher power, thereby achieving fast charging. Based on this, a fast charging chip based on the Power Delivery protocol can be placed between the power input terminal and the external power source to regulate the input current at the power input terminal. Thus, in addition to the traditional 12V power supply, the power input terminal can also receive voltages such as 5V, 9V, 12V, and 15V that conform to the PD protocol, converting them into an input current suitable for charging the battery in the aforementioned DC power supply. This adapts to the power supply of different external power sources, enabling the DC power supply to recognize and utilize fast charging interfaces that support the fast charging protocol for efficient charging.

[0090] Alternatively, a chip supporting other charging protocols can be placed between the power input terminal and the external power supply to improve the compatibility of the aforementioned extended-range DC power supply, ensuring correct charging regardless of the charging standard used by the automaker.

[0091] For example, such as Figure 7 As shown, the CFG pin of the charging control chip can be used to configure the working mode of the fast charging chip, which can be set by an external circuit or microcontroller. The PG pin is a signal output pin that can be used to indicate the good power status. When the PD fast charging chip successfully negotiates a suitable power supply voltage and current, it will output a signal through the PG pin to indicate that the power supply is stable and can start charging. The CC1 and CC2 pins can be used for data communication. They can detect the charging current and can also be used to send and receive PD protocol signals to realize bidirectional communication between the DC power supply and the external power supply to negotiate charging parameters. Furthermore, the CC1 and CC2 pins can handshake and communicate with the external power supply that uses the PD protocol for charging to configure charging parameters. The charging control chip can control the voltage and current of the external power supply to charge the battery according to the negotiated parameters.

[0092] In this embodiment, by placing a charging control chip between the power input terminal and the external power supply, the compatibility between the power supply and the external power supply can be improved, and the service life of the power supply can be extended.

[0093] In one exemplary embodiment, the signal output circuit is further configured to output a high-level signal to an external device when there is a power input at the power input terminal, and to output a low-level signal to an external device when there is no power input at the power input terminal.

[0094] Similar to the previous embodiments, the dashcam can determine whether the car is in ignition state based on the ACC signal, and then switch its own working mode. It works normally when the car is ignited and enters parking monitoring mode when the car is turned off.

[0095] Alternatively, other devices may be present in the vehicle that switch their own modes based on the vehicle's ignition signal. For example, they may enter a power-saving mode when the vehicle is turned off.

[0096] For some automotive components, mode switching logic based on the vehicle's ignition signal may be preset at the factory. For example, many dashcams are designed with mode switching logic based on the ACC signal. In this embodiment, the signal output circuit simulates the vehicle's ignition signal and outputs it to external devices according to the vehicle's status. Without modifying the software or hardware design of the external devices, the external devices can maintain automatic response to the vehicle's status, thereby maintaining the system's uniformity and stability.

[0097] Optionally, the signal output circuit can output a high-level signal to external devices when there is power input at the power input terminal to indicate that the car is in the ignition state; and output a low-level signal to external devices when there is no power input at the power input terminal to indicate that the car is in the off state. In this way, by judging whether there is power supply, different high and low level signals can be simulated, and the external devices can be accurately switched between the normal mode and the parking mode.

[0098] For example, such as Figure 8 As shown, when there is power input at the power input terminal, the high-level voltage Vout is applied to the input terminal of Q3 through R18, causing Q3 to conduct. The conduction of Q3 provides a drive signal to Q4, which also conducts, ultimately causing ACC_12V to output a high-level signal. Conversely, when there is no power input at the power input terminal, the Vout voltage is low, and both Q3 and Q4 will be turned off, resulting in ACC_12V outputting a low-level signal. In addition, the use of capacitors C1 and C2, resistor R20, and other components in the signal output circuit can ensure signal stability and normal operation of the transistors, providing protection for the circuit and preventing damage due to power fluctuations or reverse voltage.

[0099] This embodiment improves the compatibility and convenience of the extended-range DC power supply by simulating the ignition signal of a car through a signal output circuit.

[0100] In one exemplary embodiment, the power input terminal is used to connect to the car cigarette lighter, the external power source is the car power supply, the external device is a dashcam, and the battery is a lithium iron phosphate battery.

[0101] Here, the car cigarette lighter (or in-vehicle USB interface, USB stands for Universal Serial Bus) is a standard power interface commonly used in the vehicle environment. Its interface and power supply standards are relatively unified. Using the cigarette lighter for power supply can avoid the risks and complexities of directly connecting to the car battery, and reduce installation costs and potential damage risks.

[0102] In this embodiment, the external power source can refer to the car's power supply, which can transmit energy through the car's cigarette lighter interface and the extended DC power supply. Correspondingly, the external device is the dashcam, which can be the power source of the extended DC power supply. The extended DC power supply can be connected to the dashcam through its power output port.

[0103] In this embodiment, the power input terminal of the extended-range DC power supply is connected to the cigarette lighter (in-vehicle USB), and the output terminal is connected to the dashcam. Compared with the related technology where the dashcam is connected to the battery, the installation is simple and convenient.

[0104] Optionally, lithium iron phosphate batteries can be used as the batteries in the aforementioned DC power supply. Compared with other lithium-ion batteries, lithium iron phosphate batteries have higher stability and safety. They are not prone to thermal runaway or explosion even under overcharge or over-discharge conditions. They have a long cycle life, and even after multiple charge and discharge cycles, the battery capacity decays slowly, making them suitable for applications that require frequent charge and discharge. Using lithium iron phosphate batteries as the batteries in the aforementioned DC power supply can improve the lifespan and stability of the DC power supply.

[0105] In this embodiment, by setting up a DC power supply that charges the dashcam via the car's cigarette lighter socket, the installation cost of the DC power supply can be reduced, and the risk of damage to the DC power supply can be decreased.

[0106] The following explanation, using optional examples, illustrates the extended-range DC power supply in this application. In this optional example, the extended-range DC power supply can be designed as follows: Figure 9 The slender shape shown makes it small in size, making it more suitable for concealed installation in a car. The power input is compatible with both traditional USB and Type-C ports, while the output can be either Type-C or Micro-USB, meeting a wider range of product needs.

[0107] Figure 10 This is a schematic diagram of the operation of the DC power supply in this optional example, such as... Figure 10 As shown, the usage process of this extended-range DC power supply may include the following steps:

[0108] First, this power supply has an input port and an output port. The input port is used to power the extended DC power supply, and the output port is used to power the dashcam. Connect the input port to the car cigarette lighter (in-car USB), and connect the output port to the dashcam.

[0109] When the car starts, the cigarette lighter USB output turns on and begins charging the battery in the DC power supply. At this time, the power supply product detects the power input and considers the car to be in the ignition state. It sets the ACC signal output to the dashcam to high and boosts the main power supply to the dashcam. When the dashcam detects the ACC signal, it works normally.

[0110] When the car is turned off, the cigarette lighter USB output is disconnected, and there is no power input to the DC power supply. This power supply detects no input power and assumes the car is off. It sets the ACC signal output to the dashcam to low and boosts the voltage of the built-in battery to supply power to the dashcam. The dashcam detects no ACC signal, so it works in parking monitoring mode until the battery is depleted or the car is restarted.

[0111] Correspondingly, Figure 11 This is a schematic diagram of the structure of the DC power supply for extended battery life in this optional example, as shown below. Figure 11 As shown, the car power supply is powered via USB. After passing through the power protection circuit, the battery is charged through the charging circuit. Both battery charging and discharging pass through the battery protection circuit. At the same time, the power selection circuit selects the input power of the boost circuit. When the car is started, the USB input power is selected (i.e., the car power supply is selected as the input power). When the car is turned off, the battery is selected as the input power. The boosted voltage is then supplied to the power port of the dashcam. The ACC output circuit is used to detect the presence or absence of input power. If there is input power, the ACC signal is output as a high-level signal; if there is no input power, the ACC signal is output as a low-level signal, which is then sent to the dashcam.

[0112] This optional example demonstrates how a low-cost, extended-range DC power supply connected to a car cigarette lighter (in-car USB) enables a dashcam to monitor parking. By detecting the presence or absence of an ACC signal, the dashcam can accurately switch between normal mode and parking monitoring mode.

[0113] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0114] Obviously, those skilled in the art should understand that the modules or steps of this application described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this application is not limited to any particular combination of hardware and software.

[0115] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A DC power supply for extended battery life, characterized in that, include: The system includes a battery, a charging circuit, a power selection circuit, a boost circuit, and a signal output circuit. The charging circuit is located on a charging board, the battery is connected to the charging board, the boost circuit is located on a boost board, and the charging board and the boost board are located on different motherboards. The charging circuit is used to charge the battery through an external power source connected to the power input terminal of the DC power supply. The power selection circuit is used to select the input power of the boost circuit from the external power source and the battery according to the power input status, wherein the power input status is used to indicate whether there is current input at the power input terminal; The boost circuit is used to boost the output voltage of the input power supply to a preset voltage and supply power to the external devices connected to the boost board. The signal output circuit is used to output a simulated ignition signal to the external device according to the power input state.

2. The DC power supply for extended battery life according to claim 1, characterized in that, The extended-range DC power supply also includes: A power protection circuit, connected between the power input terminal and the charging circuit, is used to monitor and control a first parameter of the power input terminal, wherein the first parameter includes at least one of the following: voltage, current, and temperature.

3. The DC power supply for extended battery life according to claim 1, characterized in that, The extended-range DC power supply also includes: A battery protection circuit, located between the charging circuit and the battery, is used to monitor and control a second parameter during the charging process of the battery, wherein the second parameter includes at least one of the following: voltage, current, and temperature.

4. The DC power supply for extended battery life according to claim 3, characterized in that, The battery protection circuit is also located between the battery and the power selection circuit. The battery protection circuit is also used to monitor and control the second parameter during the discharge process of the battery in order to protect the discharge process of the battery.

5. The DC power supply for extended battery life according to claim 4, characterized in that, The charging circuit includes: The first and second charging control components, connected in parallel, are used to detect the charging state of the battery.

6. The DC power supply for extended battery life according to claim 4, characterized in that, The charging circuit also includes: A charging indicator light, connected to a first charging control component, is used to indicate the charging status of the battery. The current flowing through the first charging control component is lower than the current flowing through the second charging control component. When the battery cannot be charged through the first charging control component, the charging indicator light is in a first state. When the battery is being charged through the first charging control component, the charging indicator light is in a second state.

7. The DC power supply for extended battery life according to claim 1, characterized in that, The power selection circuit includes an ideal diode, and the power selection circuit is further used to control the input power supply of the selected boost circuit based on the on / off state of the ideal diode.

8. The DC power supply for extended battery life according to claim 1, characterized in that, The extended-range DC power supply also includes: A charging control chip is integrated at the power input terminal to regulate the input current of the power input terminal. The charging control chip is a fast charging chip based on a power transfer fast charging protocol.

9. The DC power supply for extended battery life according to claim 1, characterized in that, The signal output circuit is further configured to output a high-level signal to the external device when there is a power input at the power input terminal, and to output a low-level signal to the external device when there is no power input at the power input terminal.

10. The DC power supply for extended battery life according to any one of claims 1 to 9, characterized in that, The power input terminal is used to connect to the car cigarette lighter, the external power source is the car power supply, the external device is a dashcam, and the battery is a lithium iron phosphate battery.

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