Power supply module

Abstract

The utility model relates to the technical field of sound systems, in particular to a power supply module, which comprises a battery charging circuit, a first battery, a second battery, a battery parallel switch and a battery voltage detection unit, and is characterized in that the battery charging circuit is used for converting an input power amplification signal into a charging signal to charge the first battery; the first battery and the second battery are connected in parallel; the battery parallel switch is arranged between the first battery and the second battery; when the battery voltage detection unit detects that the voltage of the first battery is smaller than a first voltage threshold value, the battery parallel switch is switched off, and the battery charging circuit can charge the first battery; and when the battery voltage detection unit detects that the voltage of the first battery is greater than a second voltage threshold value, the battery charging circuit is disconnected, and the battery parallel switch is conducted for a preset time. The power supply module provided by the utility model can charge the battery by using the power amplification signal, and has the characteristics of high safety performance, low energy consumption, long service life, intelligent work and the like.

Description

Technical Field

[0001] This utility model relates to the field of audio system technology, specifically to a power supply module. Background Technology

[0002] In places like schools, sound systems play an indispensable role as vital devices for transmitting sound. These systems typically consist of two core components: an amplifier and speakers. The amplifier provides sufficient power to drive the speakers to produce clear and loud sound, ensuring the effective transmission of information.

[0003] However, traditional loudspeakers lack features such as information display and intelligent control. To implement these additional functions in a traditional loudspeaker, a display module, intelligent control module, and so on need to be installed inside the loudspeaker's casing. Furthermore, an additional battery is required to power these modules. While the battery can meet short-term power needs, its battery life is limited, requiring replacement approximately once a month under normal use. This frequent replacement increases maintenance costs. Moreover, many loudspeakers are often installed in high positions, such as on classroom walls or ceilings, to achieve better sound coverage. Changing the batteries requires staff to climb, which is not only time-consuming and labor-intensive but also poses certain safety risks. Utility Model Content

[0004] This invention addresses the technical problem of high maintenance costs associated with frequent battery replacements in existing speaker technologies. It provides a power module that can charge the battery using a power amplifier signal, eliminating the need for frequent replacements and maintenance. Furthermore, it incorporates two batteries: a first battery and a second battery. The first battery is charged by the power amplifier signal, while the second battery is charged by the first battery. While the first battery is charging, the second battery provides a stable output voltage. This design offers advantages such as high safety, low energy consumption, and long service life.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A power module includes a battery charging circuit, a first battery, a second battery, a battery parallel switch, and a battery voltage detection unit, wherein...

[0007] The battery charging circuit is used to convert the input power amplifier signal into a charging signal to charge the first battery.

[0008] The first battery and the second battery are connected in parallel, and the battery parallel switch is disposed between the first battery and the second battery;

[0009] When the battery voltage detection unit detects that the voltage of the first battery is less than a first voltage threshold, the battery parallel switch is turned off, and the battery charging circuit can charge the first battery; when the battery voltage detection unit detects that the voltage of the first battery is greater than a second voltage threshold, the battery charging circuit is turned off, and the battery parallel switch is turned on for a preset time.

[0010] Further, the battery charging circuit comprises a rectification unit, a filter unit, a voltage stabilization unit, a charging management unit and a charging switch, wherein,

[0011] The rectification unit is configured to rectify an input power amplifier signal;

[0012] The filter unit is configured to filter the rectified signal;

[0013] The voltage stabilization unit is configured to convert the filtered signal into a working signal for the charging management unit;

[0014] The charging management unit is configured to charge the first battery;

[0015] The charging switch is configured to control the on-off of the battery charging circuit.

[0016] Further, the power supply module further comprises a current limiting unit, which is arranged between the filter unit and the voltage stabilization unit.

[0017] Further, the charging switch comprises a first charging switch and a second charging switch, wherein,

[0018] The first charging switch is arranged between the rectification unit and the filter unit, and is turned on when the battery voltage detection unit detects that the voltage of the first battery is less than a first voltage threshold;

[0019] The second charging switch is arranged between the voltage stabilization unit and the charging management unit, and the power supply module further comprises a filtered voltage detection unit, a current detection unit and a temperature detection unit, the filtered voltage detection unit is arranged between the current limiting unit and the voltage stabilization unit, the current detection unit is arranged between the voltage stabilization unit and the second charging switch, and the temperature detection unit is configured to detect the temperature of the voltage stabilization unit; when the filtered voltage detection unit detects that the filtered and current-limited voltage is greater than a third voltage threshold, the current detection unit detects that the current is less than a current threshold, and the temperature detection unit detects that the temperature is less than a temperature threshold, the second charging switch is turned on.

[0020] Further, the power module further comprises a main control unit and a first voltage conversion unit, the first voltage conversion unit is used for converting the voltage of the second battery into a first voltage which can power the main control unit.

[0021] Further, the main control unit is used for receiving the detection signals of the battery voltage detection unit, the filtered voltage detection unit, the current detection unit and the temperature detection unit, and for controlling the on-off of the battery parallel switch, the first charging switch and the second charging switch.

[0022] Further,

[0023] The battery parallel switch is a PMOS tube, the source and the drain of the battery parallel switch are connected to the positive poles of the first battery and the second battery respectively, and the gate of the battery parallel switch is controlled by the main control unit.

[0024] The first charging switch is a relay, the normally open contact of the first charging switch is connected to the positive output end of the rectifying unit and the first end of the filtering unit respectively, and the coil of the first charging switch is powered by the main control unit.

[0025] The second charging switch is a PMOS tube, the source and the drain of the second charging switch are connected to the output end of the current detection unit and the input end of the charging management unit respectively, and the gate of the second charging switch is controlled by the main control unit.

[0026] Further, the power module further comprises a second voltage conversion unit, the second voltage conversion unit is used for converting the voltage of the second battery into a second voltage.

[0027] The gate of the battery parallel switch is connected to the output end of a first non-inverting amplifier, the positive input end of the first non-inverting amplifier is connected to the main control unit, and the first non-inverting amplifier is powered by the second voltage conversion unit.

[0028] The first end of the coil of the first charging switch is grounded, and the second end is connected to the output end of the second voltage conversion unit, the enable end of the second voltage conversion unit is connected to the main control unit.

[0029] The gate of the second charging switch is connected to the output end of a second non-inverting amplifier, the positive input end of the second non-inverting amplifier is connected to the main control unit, and the second non-inverting amplifier is powered by the second voltage conversion unit.

[0030] Further,

[0031] The battery voltage detection unit comprises a first detection resistor and a second detection resistor, a first end of the first detection resistor is connected to a positive pole of the first battery, a second end of the first detection resistor is connected to a first end of the second detection resistor, and a second end of the second detection resistor is grounded; and the second end of the first detection resistor is connected to the master control unit.

[0032] The filtered voltage detection unit comprises a third detection resistor and a fourth detection resistor, a first end of the third detection resistor is connected to a first end of the current limiting unit, a second end of the third detection resistor is connected to a first end of the fourth detection resistor, and a second end of the fourth detection resistor is connected to a second end of the current limiting unit; and the second end of the third detection resistor is connected to the master control unit.

[0033] Further, the voltage stabilizing unit is a linear voltage stabilizer.

[0034] Compared with the prior art, the power module has the following beneficial effects: the power module can charge the integrated battery in the loudspeaker shell without manual replacement, thereby reducing the maintenance cost and eliminating the safety risks caused by climbing work of the staff; and the first battery and the second battery are arranged, the second battery supplies power when the first battery is charging, the second battery can provide relatively stable voltage and current to the devices requiring power supply in the master control unit and the battery charging circuit and can provide relatively stable voltage and current to other intelligent modules such as a display module and an intelligent control module, so that damage of the devices and the modules caused by inrush current can be prevented, and the service life and the power utilization efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0036] Figure 1 It is the overall flow block diagram of the power module of the utility model embodiment one;

[0037] Figure 2 It is the principle schematic drawing of the battery charging circuit, the first battery, the second battery and the battery parallel switch of the utility model embodiment two;

[0038] Figure 3 It is the principle schematic drawing of the battery voltage detection unit of the utility model embodiment two;

[0039] Figure 4 This is a schematic diagram of the main control chip in Embodiment 2 of this utility model;

[0040] Figure 5 This is a schematic diagram of the first voltage conversion unit in Embodiment 2 of this utility model;

[0041] Figure 6 This is a schematic diagram of the second voltage conversion unit in Embodiment 2 of this utility model. Detailed Implementation

[0042] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0043] Example 1:

[0044] like Figure 1 As shown, this embodiment provides a power module, which includes a battery charging circuit, a first battery, a second battery, a battery parallel switch, and a battery voltage detection unit.

[0045] The input terminal of the battery charging circuit is connected to a constant-impedance power amplifier in parallel with the speaker. The power amplifier signal is output to the battery charging circuit simultaneously with the speaker. The battery charging circuit converts the input power amplifier signal into a charging signal to charge the first battery. The first battery is preferably a lithium battery, such as an 18650 model battery. The battery charging circuit is a circuit that processes the input power amplifier signal and outputs a suitable charging signal to charge the first battery.

[0046] The second battery and the first battery are connected in parallel, and the battery parallel switch is disposed between the first and second batteries, for example, between the positive terminals of the first and second batteries. Preferably, the second battery is also a lithium battery, such as an 18650 battery, and its capacity is the same as that of the first battery.

[0047] The battery voltage detection unit is used for detecting the voltage of the first battery, when the battery voltage detection unit detects that the voltage of the first battery is less than a first voltage threshold, the battery parallel switch is turned off, and the battery charging circuit can charge the first battery; when the battery voltage detection unit detects that the voltage of the first battery is greater than a second voltage threshold, the battery charging circuit is turned off, the battery parallel switch is turned on for a preset time, the first battery discharges to the second battery, and the equalization is completed within the preset time. The first voltage threshold is less than the second voltage threshold, for example, the first voltage threshold is set to 3.9V, at this time, the first battery needs to be charged, and the second voltage threshold is set to 4.1V, at this time, the first battery is charged and can charge the second battery for equalization; the preset time can be set according to the actual situation, for example, determined by testing. In addition, the main control unit can receive the signal of the battery voltage detection unit and control the on-off of the battery parallel switch and the battery charging circuit.

[0048] Thus, the power module provided by the embodiment can charge the battery integrated in the loudspeaker horn without manual replacement, thereby reducing the maintenance cost and eliminating the safety risk caused by the climbing work of the staff.

[0049] In addition, the second battery is arranged in the embodiment, the second battery supplies power when the first battery is charged, the second battery can provide relatively stable voltage and current to the devices requiring power supply in the main control unit and the battery charging circuit, and provide relatively stable voltage and current to other additional intelligent modules such as display modules and intelligent control modules, so that damage of these devices and modules caused by inrush current can be prevented, and the service life and the power utilization efficiency are improved; when the first battery does not need to be charged, the second battery and the first battery supply power together, stable voltage and current can be provided, and the capacity is relatively increased. If only one battery is used, the battery needs to be charged and discharged, the service life is reduced, the charging signal for charging the battery is relatively unstable voltage and current, which can damage subsequent devices, and the power is wasted.

[0050] As Figure 1The battery charging circuit of the embodiment includes a rectifier unit, a filter unit, a voltage stabilizing unit, a charging management unit and a charging switch. The rectifier unit is used to rectify the input power amplifier signal, which is an alternating current signal, into a pulsating direct current signal. The filter unit is used to filter the rectified signal, so that the pulsating direct current signal becomes a smooth direct current signal. The voltage stabilizing unit is used to convert the filtered signal into a working signal for the charging management unit. The voltage of the power amplifier signal is a variable voltage signal, for example, fluctuating around 0-50V. The subsequent charging management unit needs a suitable working voltage, for example, 5V. Therefore, the voltage stabilizing unit outputs a stable voltage to the charging management unit for working. The charging management unit uses a charging management chip to charge the first battery. The charging switch is used to control the on-off of the battery charging circuit, and can be connected to the main control unit and controlled by the main control unit.

[0051] In addition, the power module further includes a current limiting unit arranged between the filter unit and the voltage stabilizing unit. The current limiting unit filters out high voltage, for example, filters out voltage higher than 30V, to prevent damage to the subsequent voltage stabilizing unit and the like caused by excessively high voltage.

[0052] Preferably, the charging switch of the embodiment includes a first charging switch and a second charging switch. The first charging switch is arranged between the rectifier unit and the filter unit, and turns on when the battery voltage detection unit detects that the voltage of the first battery is less than a first voltage threshold, for example, 3.9V.

[0053] The second charging switch is arranged between the voltage stabilizing unit and the charging management unit. The power module further includes a filtered voltage detection unit, a current detection unit and a temperature detection unit. The filtered voltage detection unit is arranged between the current limiting unit and the voltage stabilizing unit, and is used to detect the voltage after filtering and current limiting. The current detection unit is arranged between the voltage stabilizing unit and the second charging switch, and is used to detect the current in the battery charging circuit. The temperature detection unit is used to detect the temperature of the voltage stabilizing unit and the like. The second charging switch turns on when the filtered voltage detection unit detects that the voltage after filtering by the filter unit and the current limiting unit is greater than a third voltage threshold, the current detection unit detects that the current is less than a current threshold, and the temperature detection unit detects that the temperature is less than a temperature threshold. The on-off of the first charging switch and the second charging switch can be controlled by the main control unit. The detection signals of the filtered voltage detection unit, the current detection unit and the temperature detection unit can also be transmitted to the main control unit.

[0054] Thus, by setting the first charging switch, when it is detected that the first battery needs to be charged, the first charging switch is first turned on; and by setting the second charging switch, only when the filtered voltage is greater than a third voltage threshold value, for example, 5-7V, and the current size is less than a current threshold value, for example, 1A, and the temperature of the voltage stabilizing unit is less than a temperature threshold value, for example, 65℃, the second charging switch is turned on, and in other cases, the second charging switch is turned off, so that the energy consumption of the voltage stabilizing unit, the charging management unit and other devices can be reduced, and overcurrent and overtemperature protection can be performed on the battery charging circuit. More preferably, when the filtered voltage detection unit detects that the voltage is not appropriate, or the current exceeds the current threshold value, or the temperature exceeds the temperature threshold value for a long time, for example, for 1-3s, the first charging switch can be turned off for a few seconds and then turned on again, so as to reduce the energy consumption of the filtering unit, the current limiting unit, the filtered voltage detection unit and the voltage stabilizing unit.

[0055] The power supply module of the embodiment further comprises a first voltage converting unit, which is used to convert the voltage of the second battery into a first voltage capable of powering the master control unit, for example, a first voltage of 3.3V. Of course, other voltage converting units can also be set according to needs, for example, a second voltage converting unit is set to convert the voltage into a second voltage, for example, 12V, to power other devices requiring higher operating voltage.

[0056] In summary, the power supply module provided by the embodiment can charge the battery, and has the characteristics of high safety performance, low energy consumption, long service life and intelligent operation.

[0057] Embodiment Two

[0058] As shown in Figures 2-6 , the embodiment provides a specific implementation of the power supply module corresponding to the power supply module described in Embodiment One.

[0059] Specifically, referring to Figure 2 , the interface J1 of the embodiment is connected to a constant resistance power amplifier, and is connected in parallel with a loudspeaker. The power amplifier signal output by the constant resistance power amplifier flows to the subsequent part of the power supply module through the interface J1. The voltage of the power amplifier signal is about 0-50V, and the current size is about 0-1A.

[0060] Further, the battery charging circuit of the embodiment comprises a rectifying unit D1, a first charging switch Q1, a filtering unit, a current limiting unit, a filtered voltage detection unit, a voltage stabilizing unit U3, a current detection unit U2, a second charging switch Q2 and a charging management unit U1.

[0061] The two input ends of the rectifying unit D1 are connected to the interface J1, and existing rectifying circuits, for example, full-wave rectifying circuits, half-wave rectifying circuits and the like, can be used, and the embodiment does not limit this.

[0062] The first charging switch Q1 is a relay, preferably a 12V, 5-pin relay, the coil of which is connected between the first pin and the fourth pin, the second pin and the fifth pin are normally open contacts, and the third pin is empty. The fifth pin and the second pin of the first charging switch Q1 are connected to the positive output end of the rectifier unit D1 and the first end of the filter unit respectively, the first pin of the first charging switch Q1 is grounded, and the fourth pin is connected to the 12V output end of the second voltage conversion unit. The enable end of the second voltage conversion unit is connected to the main control unit U10 and is controlled by the main control unit U10. When the main control unit U10 controls the second voltage conversion unit to work, for example, by providing a high level to the enable end, the second voltage conversion unit outputs a 12V voltage, the coil of the first charging switch Q1 is turned on, and the second pin and the fifth pin of the first charging switch Q1 are also turned on. When the main control unit U10 controls the second voltage conversion unit not to work, for example, by providing a low level to the enable end, the coil of the first charging switch Q1 is powered off, and the second pin and the fifth pin of the first charging switch Q1 are also disconnected.

[0063] In addition, as Figure 4 , the main control unit U10 of the embodiment is an intelligent chip that can receive detection signals and send control signals, and its model can be selected but is not limited to the STM32 series. As Figure 5 , the first voltage conversion unit is provided to convert the voltage of the second battery U5, such as 3.7-3.9V, to a first voltage, such as 3.3V, that can be used by the main control chip U10. The first voltage conversion unit includes a step-down chip U9 and its peripheral circuit, and the step-down chip U9 can be selected but is not limited to the CS5517T model. As Figure 6 , the second voltage conversion unit can convert the voltage of the second battery U5, such as 3.7-3.9V, to a second voltage, such as 12V, that can be used by the coil of the first charging switch Q1. The second voltage conversion unit includes a step-up chip U6 and its peripheral circuit, and the step-up chip U6 can be selected but is not limited to the MT3608L model. In other embodiments, if the step-up chip U6 in the second voltage conversion unit can withstand a large enough current, the input end of the second voltage conversion unit can also be connected to the first battery U4, thereby reducing the energy consumption of the second battery U5 when charging the first battery U4.

[0064] Continuing to refer to Figure 2 , the filter unit includes a first filter capacitor C3 and a second filter capacitor C4. The first ends of the first filter capacitor C3 and the second filter capacitor C4 are connected to the positive output end of the rectifier unit D1 through the first charging switch Q1, and the second ends of the first filter capacitor C3 and the second filter capacitor C4 are connected to the negative output end of the rectifier unit D1.

[0065] The current limiting unit comprises a voltage stabilizing diode D2 and a current limiting resistor R11, the negative electrode of the voltage stabilizing diode D2 is connected to the first end of the filter unit, the positive electrode of the voltage stabilizing diode D2 is connected to the first end of the current limiting resistor R11, and the second end of the current limiting resistor R11 is connected to the second end of the filter unit.

[0066] The post-filter voltage detection unit comprises a third detection resistor R7 and a fourth detection resistor R8, the first end of the third detection resistor R7 is connected to the first end of the current limiting unit, the second end of the third detection resistor R7 is connected to the first end of the fourth detection resistor R8, the second end of the fourth detection resistor R8 is connected to the second end of the current limiting unit, and the second end of the third detection resistor R7 is connected to the master control unit U10 to send the detected voltage signal to the master control unit U10.

[0067] The voltage stabilizing unit U3 is a linear voltage stabilizer comprising three ports, the first port and the second port are respectively connected to the first end of the third detection resistor R7 and the second end of the fourth detection resistor R8, and the third port is directly or indirectly connected to the input end of the current detection unit. The linear voltage stabilizer U3 can be selected but is not limited to the model 78M05, the input is about 7-35V, and a 5V voltage signal can be output to the subsequent charge management unit U1. The current detection unit U2 is used for detecting current and can be selected but is not limited to the model ACS712. The temperature detection unit of the embodiment can use a thermistor for detection, which is prior art and will not be described in detail.

[0068] The second charge switch Q2 is a PMOS tube, preferably an enhancement mode PMOS tube, the source and drain of the second charge switch Q2 are respectively connected to the output end of the current detection unit U2 and the input end of the charge management unit U1. The gate of the second charge switch Q2 is connected to the output end of the second same-phase amplifier U7, the positive input end of the second same-phase amplifier is connected to the master control unit U10, and the control signal output by the master control unit U10 is amplified by the second same-phase amplifier U7 to better control the second charge switch Q2. When the gate of the second charge switch Q2 is at a low level, for example, 0V, the second charge switch Q2 can be turned on because the voltage output by the voltage stabilizing unit U3 is about 5V; when the gate of the second charge switch Q2 is at a high level, for example, 5-12V, the second charge switch Q2 can be turned off. The working voltage of the second same-phase amplifier U7 is preferably 12V, which is also supplied by the second voltage conversion unit.

[0069] The charge management unit U1 adopts a charge management chip, which can be selected but is not limited to the model TP4056. Preferably, a reverse prevention diode D3 and a resistor R6 are further arranged between the drain of the second charge switch Q2 and the input end of the charge management unit U1 to further prevent reverse and current limiting.

[0070] The first battery U4 and the second battery U5 of the embodiment are both lithium batteries of 18650 model, the first battery U4 and the second battery U5 are connected in parallel, specifically, a battery parallel switch Q3 is arranged, the battery parallel switch Q3 is a PMOS tube, preferably an enhanced PMOS tube, the source and the drain of the battery parallel switch Q3 are connected with the positive poles of the first battery U4 and the second battery U5 respectively, the gate of the battery parallel switch Q3 is connected with the output end of the first non-inverting amplifier U8, the positive input end of the first non-inverting amplifier U8 is connected with the master control unit U10, the control signal output by the master control unit U10 is amplified by the first non-inverting amplifier U8, so as to better control the battery parallel switch Q3; the negative pole of the first battery U4 is connected with the negative pole of the second battery U5. When the gate of the battery parallel switch Q3 is low voltage such as 0V, the battery parallel switch Q3 is turned on due to the voltage of the first battery U4 being about 3.9-4.1V; when the gate of the battery parallel switch Q3 is high voltage such as 5-12V, the battery parallel switch Q3 is turned off. The first non-inverting amplifier U8 can adopt the same model as the second non-inverting amplifier U7, and is powered by 12V voltage provided by the second voltage conversion unit. In addition, a current limiting resistor can also be arranged between the first battery U4 and the second battery U5 according to needs.

[0071] As Figure 3 The battery voltage detection unit of the embodiment includes a first detection resistor R12 and a second detection resistor R13, the first end of the first detection resistor R12 is connected with the positive pole of the first battery U4, the second end of the first detection resistor R12 is connected with the first end of the second detection resistor R13, and the second end of the second detection resistor R13 is grounded; the second end of the first detection resistor R12 is connected with the master control unit U10, and the voltage detection signal is sent to the master control unit U10.

[0072] The power module of the embodiment can be adapted to a 250W dual-channel power amplifier, when working, the constant resistance power amplifier outputs the power amplifier signal to the loudspeaker and also outputs the power amplifier signal to the power module; the voltage of the power amplifier signal is about 0-50V, and the current is about 0-1A, the embodiment selects 30V and below as the available voltage, and 30-50V voltage is filtered out.

[0073] Specifically, when the battery voltage detection unit detects that the voltage of the first battery U4 is less than a first threshold value, for example 3.9V, the first battery U4 needs to be charged, at this time the master control unit U10 controls the second voltage conversion unit to work, the coil of the first charging switch Q1 is powered, the first charging switch Q1 is turned on, and the battery parallel switch Q3 is turned off, the power amplifier signal is rectified and filtered by the rectifier unit D1 and the filter unit to make the voltage signal tend to be stable, and the large voltage above 30V is filtered out by the current limiting unit. Then the filtered voltage detection unit detects the voltage, if it is detected that the voltage is appropriate, for example above 5-7V, the second charging switch Q2 is turned on, the stable voltage output by the voltage stabilizing unit U3, for example 5V, is output to the charging management unit U1, and the charging management unit U1 charges the first battery U4. Then the filtered voltage detection unit, the current detection unit and the temperature detection unit continue to detect the voltage, current and temperature at a certain frequency, if it is detected that the voltage is not appropriate, for example less than 5V or more than 30V, or the current is too large, for example more than 1A, or the temperature is too high, for example more than 65℃, the second charging switch Q2 is turned off. And if the second charging switch Q2 is turned off for a certain time, for example 1-3s, the first charging switch Q1 is turned off for a certain time and then turned on. During the charging of the first battery U4, the second battery U5 supplies power to each device and supplies power to the outside.

[0074] When the first battery U4 is charged to a second threshold voltage, for example 4.1V, the master control unit U10 controls the second voltage conversion unit not to work, the coil of the first charging switch Q1 is powered off, the first charging switch Q1 is turned off, the battery parallel switch Q3 is turned on, and the first battery U4 can discharge the second battery U5, and then equalize after a preset time. Then the first battery U4 and the second battery U5 together supply power to some devices and supply power to the outside.

[0075] Any process or method descriptions or any other descriptions herein can be understood as representing embodiments of the application comprising one or more steps, circuits, or portions of code for implementing the specified logical function or process, and the scope of the preferred embodiments of the application includes additional implementation in which the steps, circuits, or portions of code are performed in an order different from that shown or discussed, including substantially simultaneously, or in reverse order, as will be understood by those skilled in the art of the functional aspects involved.

[0076] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] The above embodiments only describe the preferred embodiments of the utility model, and do not limit the scope of the utility model, and various deformations and improvements of the technical scheme of the utility model made by the ordinary engineering technicians in the art without departing from the design spirit of the utility model shall fall within the protection scope determined by the claims of the utility model.

Claims

1. A power module, characterized by The power supply module comprises a battery charging circuit, a first battery, a second battery, a battery parallel switch and a battery voltage detection unit, wherein, The battery charging circuit is used for converting an input power amplifier signal into a charging signal to charge the first battery; The first battery and the second battery are connected in parallel, and the battery parallel switch is arranged between the first battery and the second battery; When the battery voltage detection unit detects that the voltage of the first battery is less than a first voltage threshold, the battery parallel switch is turned off, and the battery charging circuit can charge the first battery; when the battery voltage detection unit detects that the voltage of the first battery is greater than a second voltage threshold, the battery charging circuit is turned off, and the battery parallel switch is turned on for a preset time.

2. The power module of claim 1, wherein, The battery charging circuit comprises a rectification unit, a filtering unit, a voltage stabilizing unit, a charging management unit and a charging switch, wherein, The rectification unit is used for rectifying an input power amplifier signal; The filtering unit is used for filtering the rectified signal; The voltage stabilizing unit is used for converting the filtered signal into a working signal for the charging management unit; The charging management unit is used for charging the first battery; The charging switch is used for controlling the on-off of the battery charging circuit.

3. The power module of claim 2, wherein, The power supply module further comprises a current limiting unit arranged between the filtering unit and the voltage stabilizing unit.

4. The power module of claim 3, wherein, The charging switch comprises a first charging switch and a second charging switch, wherein, The first charging switch is arranged between the rectification unit and the filtering unit, and is turned on when the battery voltage detection unit detects that the voltage of the first battery is less than a first voltage threshold; The second charging switch is arranged between the voltage stabilizing unit and the charging management unit, and the power supply module further comprises a filtered voltage detection unit, a current detection unit and a temperature detection unit, the filtered voltage detection unit is arranged between the current limiting unit and the voltage stabilizing unit, the current detection unit is arranged between the voltage stabilizing unit and the second charging switch, and the temperature detection unit is used for detecting the temperature of the voltage stabilizing unit; when the filtered voltage detection unit detects that the voltage after current limiting and filtering is greater than a third voltage threshold, the current detection unit detects that the current is less than a current threshold, and the temperature detection unit detects that the temperature is less than a temperature threshold, the second charging switch is turned on.

5. The power module of claim 4, wherein, The power supply module further comprises a master control unit and a first voltage conversion unit, and the first voltage conversion unit is used for converting the voltage of the second battery into a first voltage capable of supplying power to the master control unit.

6. The power module of claim 5, wherein, The master control unit is used for receiving detection signals of the battery voltage detection unit, the filtered voltage detection unit, the current detection unit and the temperature detection unit, and for controlling the on-off of the battery parallel switch, the first charging switch and the second charging switch.

7. The power supply module according to claim 6, wherein, The battery parallel switch is a PMOS tube, the source and the drain of the battery parallel switch are connected to the positive poles of the first battery and the second battery respectively, and the gate of the battery parallel switch is controlled by the master control unit. The first charging switch is a relay, and the normally open contact of the first charging switch is connected to the positive output end of the rectifying unit and the first end of the filtering unit respectively. The second charging switch is a PMOS tube, and the source and drain of the second charging switch are connected to the output end of the current detecting unit and the input end of the charging management unit respectively.

8. The power module of claim 7, wherein, The power supply module further comprises a second voltage converting unit for converting the voltage of the second battery into a second voltage. The gate of the battery parallel switch is connected to the output end of a first non-inverting amplifier, the positive input end of the first non-inverting amplifier is connected to the main control unit, and the first non-inverting amplifier is powered by the second voltage converting unit. The first end of the coil of the first charging switch is grounded, and the second end is connected to the output end of the second voltage converting unit, and the enable end of the second voltage converting unit is connected to the main control unit. The gate of the second charging switch is connected to the output end of a second non-inverting amplifier, the positive input end of the second non-inverting amplifier is connected to the main control unit, and the second non-inverting amplifier is powered by the second voltage converting unit.

9. The power supply module according to claim 6, wherein The battery voltage detecting unit comprises a first detection resistor and a second detection resistor, the first end of the first detection resistor is connected to the positive pole of the first battery, the second end of the first detection resistor is connected to the first end of the second detection resistor, and the second end of the second detection resistor is grounded; and the second end of the first detection resistor is connected to the main control unit. The filtered voltage detecting unit comprises a third detection resistor and a fourth detection resistor, the first end of the third detection resistor is connected to the first end of the current limiting unit, the second end of the third detection resistor is connected to the first end of the fourth detection resistor, and the second end of the fourth detection resistor is connected to the second end of the current limiting unit; and the second end of the third detection resistor is connected to the main control unit.

10. The power module of claim 6, wherein, The voltage stabilizing unit is a linear voltage stabilizer.

Images