1.5 V power supply interphone and power supply system thereof

Abstract

The invention discloses a 1.5 V power supply interphone and a power supply system thereof, which adopt a 1.5 V battery to supply power, and can be called as a minimum power supply scheme, thereby realizing energy conservation and environmental protection. The 1.5 V battery can be supplied with power by a 1.5 V rechargeable battery and can also be supplied with power by a 1.5 V dry battery which is most commonly used in the market, so that the battery is very convenient to purchase and replace, and the minimum use cost is realized. Moreover, a battery type detection contact is ingeniously arranged in the power supply system, and when the mounted battery is detected to be a dry battery, the battery is not charged, so that the use safety of the dry battery is ensured; when it is detected that the installed battery is a rechargeable battery, a charging loop of the rechargeable battery is switched on, and charging of the rechargeable battery is achieved. Moreover, a low-voltage protection unit is also arranged, so that the situation that the power supply output voltage output by the boost converter is too low and is not enough to drive circuits of all parts of the interphone, so that the interphone works abnormally or crashes is avoided.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a 1.5V powered intercom and a power supply system thereof. Background Art

[0002] Traditional walkie-talkie power systems generally use 7.4V or 3.7V power supplies (batteries) to ensure that they are sufficient to drive the various circuits of the walkie-talkie, such as RF integrated circuits, transmitting circuits, receiving circuits, microprocessors, audio circuits, etc. The batteries used in these 7.4V or 3.7V power supplies are special batteries designed for walkie-talkies and can only be purchased in some specific stores (such as stores selling walkie-talkies). When encountering emergencies and needing to replace batteries immediately, it is not convenient to buy replacement batteries.

[0003] Moreover, for some low-power walkie-talkies (such as the 1mW to 10mW standard required by countries such as Japan), the 7.4V or 3.7V power supply seems a bit wasteful and not energy-saving and environmentally friendly.

[0004] When the walkie-talkie needs to be miniaturized, the commonly used 1.5V No. 5 battery on the market can meet all the above requirements. However, using 1.5V power supply requires solving how to ensure the normal operation of various circuit systems of the walkie-talkie under low voltage power supply, such as transmitting circuit, receiving circuit, audio circuit, etc.; furthermore, the common 1.5V No. 5 battery has two types: rechargeable and non-rechargeable. The two batteries have different performances and complex compatibility. For the standard charging function of the walkie-talkie, it is necessary to solve the problem of battery compatibility. Summary of the invention

[0005] The purpose of the present invention is to provide a 1.5V powered intercom and a power supply system thereof, which can be powered by a conventional 1.5V battery, can be compatible with rechargeable batteries and non-rechargeable batteries, and has the characteristics of convenient purchase of replacement batteries, energy saving and environmental protection.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A power supply system for a 1.5V powered walkie-talkie, comprising a charging interface, a battery type detection unit, a 1.5V battery, a boost converter, a low voltage protection unit and a power switch, wherein the charging interface is connected to the input end of the 1.5V battery through the battery type detection unit, the output end of the 1.5V battery is connected to the input end of the boost converter, the output end of the boost converter is connected to the input end of the low voltage protection unit, the output end of the low voltage protection unit is a power supply output end, and is used to provide working power for various circuits of the walkie-talkie, and the power switch is connected to the output enable pin of the boost converter; The battery type detection unit is provided with a battery type detection contact, the battery type detection contact is connected to the negative charging contact of the charging interface, the negative contact of the 1.5V battery is provided corresponding to the battery type detection contact and the two are in an open state; The 1.5V battery is a 1.5V rechargeable battery or a 1.5V dry cell; The battery type detection contact is arranged at a position corresponding to the outer surface of the 1.5V battery. The battery shell of the 1.5V rechargeable battery has an exposed portion that is not covered by an insulating outer layer. The exposed portion contacts and electrically connects with the battery type detection contact correspondingly, thereby connecting the path between the negative contact of the 1.5V battery and the negative charging contact of the charging interface.

[0007] Furthermore, it also includes a battery replacement detection unit, a soft switch controller and a switch controller, the input end of the battery replacement detection unit is connected to the output end of the 1.5V battery, the microprocessor of the walkie-talkie is provided with a battery usage time accumulation module, the battery usage time accumulation module has a reset detection input end for resetting the accumulation time, and the output end of the battery replacement detection unit is connected to the reset detection input end; The output end of the microprocessor is connected to the control end of the soft switch controller, the output end of the soft switch controller is connected to the control end of the switch controller, and the output end of the switch controller is connected to the output enable pin of the boost converter.

[0008] Furthermore, the output end of the battery type detection unit is connected to the battery type detection input end of the microprocessor, and the microprocessor is provided with corresponding power calculation modules according to different battery types.

[0009] Furthermore, the boost converter has a model of AP2065ATCER, which is configured to output a 2.9V DC voltage.

[0010] Furthermore, the minimum input voltage of the low voltage protection unit is 2.1V. When the input voltage is less than 2.1V, the low voltage protection unit stops working.

[0011] A 1.5V powered intercom comprises a power supply system and various circuits which are powered by the power supply system and can realize the intercom function. The power supply system adopts the power supply system of the 1.5V powered intercom mentioned above, and the various circuits adopt energy-saving circuits.

[0012] Furthermore, the operating voltage requirement of each circuit is no more than 2.9V.

[0013] Further, the intercom includes the power supply system, antenna interface, transceiver circuit, radio frequency integrated circuit, audio amplifier, speaker, microphone and microprocessor; The power supply system provides working power for the microprocessor, the radio frequency integrated circuit, the audio amplifier and the transceiver circuit, and the microprocessor, the radio frequency integrated circuit, the audio amplifier and the transceiver circuit all adopt energy-saving circuits; The antenna interface is bidirectionally connected to the transceiver circuit, the transceiver circuit is bidirectionally connected to the radio frequency integrated circuit, the radio frequency integrated circuit is bidirectionally connected to the microprocessor, the audio output end of the radio frequency integrated circuit is connected to the input end of the audio amplifier, the output end of the audio amplifier is connected to the speaker, and the output end of the microphone is connected to the audio input end of the radio frequency integrated circuit.

[0014] Furthermore, the model of the microprocessor is HC32L130J8TA, the model of the radio frequency integrated circuit is BK4819, and the model of the audio amplifier is BU7150NUV.

[0015] After adopting the above scheme, the 1.5V powered intercom and its power supply system of the present invention adopts 1.5V battery power supply, which can be called the minimum power supply scheme, thereby achieving energy saving and environmental protection. Moreover, its power supply mode is very flexible, and it can be powered by 1.5V rechargeable battery or the most commonly used 1.5V dry battery on the market. It is very convenient to buy replacement batteries, thereby achieving the minimum use cost.

[0016] Moreover, a battery type detection contact is cleverly arranged in the power supply system, and the contact is arranged at a position corresponding to the outer surface of the 1.5V battery. When the 1.5V battery is installed, the contact will contact the outer surface of the battery. When a 1.5V dry battery is used for power supply, the battery type detection contact contacts the insulating outer layer that completely covers the outer shell of the dry battery, and the negative contact of the 1.5V dry battery and the negative charging contact of the charging interface are in an open state, and the 1.5V dry battery used will not be charged, ensuring the safety of the 1.5V dry battery; when a 1.5V rechargeable battery is used for power supply, the outer shell of the 1.5V rechargeable battery used is provided with an exposed part that can be electrically connected to the battery type detection contact, thereby connecting the negative contact of the 1.5V rechargeable battery and the negative charging contact of the charging interface, so that the charging circuit can be closed and the 1.5V rechargeable battery used can be charged.

[0017] Moreover, a low voltage protection unit is provided in the power supply system to prevent the power supply output voltage output by the boost converter from being too low to drive the various circuits of the intercom, causing abnormal operation or crash of the intercom.

[0018] Furthermore, the power supply system of the present invention also includes a battery replacement detection unit, a soft switch controller and a power on / off controller. Through the battery replacement detection unit, the microprocessor can detect when a new battery is replaced, and the soft switch controller and the power on / off controller can realize the soft switch in the off state of the intercom. The so-called soft switch means that after the new battery is successfully installed, no matter whether the intercom is in the off state or the on state, the microprocessor can still maintain normal operation, so that the microprocessor can perform battery replacement detection and reset the cumulative use time of the new battery, thereby realizing the battery use time accumulation function, which is of great significance for evaluating battery health, predicting battery life, optimizing equipment performance, and making decisions on battery maintenance and replacement.

[0019] Furthermore, the output end of the battery type detection unit is connected to the battery type detection input end of the microprocessor, and the microprocessor is provided with corresponding power calculation modules according to different battery types, so that the battery type detection of the replaced new battery can be realized, so that the microprocessor can select and call the corresponding battery power calculation module according to the detected battery type.

[0020] The power supply system of the 1.5V powered intercom of the present invention adopts the power supply system of the 1.5V powered intercom described above, and each circuit thereof adopts an energy-saving circuit, thereby ensuring that the power supply system is sufficient to provide working power for each circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a circuit principle block diagram of Embodiment 1 of the present invention; Figure 2 This is a circuit diagram of Embodiment 1 of the present invention; Figure 3 This is a circuit principle block diagram of Embodiment 2 of the present invention; Figure 4 The circuit diagram of the second and third embodiments of the present invention; Figure 5 A schematic diagram of the principle of battery type detection in the present invention; Figure 6 This is a circuit principle block diagram of the intercom powered by 1.5V in the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. In the present invention, the terms "including" and "provided with" and any variations thereof are intended to cover a non-exclusive inclusion.

[0023] Embodiment 1: The present invention is a 1.5V powered intercom power supply system, see Example 1 Figure 1 , Figure 2 and Figure 5 .

[0024] like Figure 1 As shown, a power supply system of a 1.5V-powered walkie-talkie of the present invention includes a charging interface, a battery type detection unit, a 1.5V battery, a boost converter, a low voltage protection unit and a power switch, wherein the charging interface is connected to the input end of the 1.5V battery through the battery type detection unit, the output end of the 1.5V battery is connected to the input end of the boost converter, the output end of the boost converter is connected to the input end of the low voltage protection unit, the output end of the low voltage protection unit is the power supply output end, which is used to provide working power for various circuits of the walkie-talkie, and the power switch is connected to the output enable pin of the boost converter.

[0025] like Figure 2 As shown, the charging interface includes a positive charging contact P1 and a negative charging contact P5, the positive charging contact P1 is connected to the positive contact P2 of the 1.5V battery B1 through a diode D1, and the negative contact P3 of the 1.5V battery B1 is grounded, and the battery type detection unit is provided with a battery type detection contact A, the battery type detection contact A is connected to the negative charging contact P5 of the charging interface, and the negative contact P3 of the 1.5V battery B1 is arranged corresponding to the battery type detection contact A and the two are in an open state. During installation, the battery type detection contact A can be welded on the pad P4 and set at a position corresponding to the outer surface of the 1.5V battery B1 (in the present invention, the outer surface of the battery only refers to the cylindrical outer side of the battery, excluding the upper bottom surface and the lower bottom surface of the battery). When the 1.5V battery B1 is installed, the battery type detection contact A will contact the outer surface of the 1.5V battery B1.

[0026] The 1.5V battery can be a 1.5V rechargeable battery or a 1.5V dry battery; specifically, the 1.5V rechargeable battery can be a single No. 5 nickel-hydrogen battery; the 1.5V dry battery can be a single No. 5 dry battery.

[0027] like Figure 5 As shown, when the 1.5V battery B1 uses a 1.5V dry battery (No. 5 dry battery), refer to Figure 5The left side of the 1.5V dry battery 2 is marked with AL, and the outer shell of the 1.5V dry battery 2 is completely covered by the insulating outer layer 21; the outer shell and the negative electrode of the existing 1.5V battery are connected, and the insulating outer layer of the battery completely covers the entire battery shell, leaving only the upper and lower positive and negative contact surfaces. In the present invention, in order to realize battery type detection, the 1.5V rechargeable battery used is specially improved. Specifically, see Figure 5 The 1.5V rechargeable battery 1 is marked with NI on the right side, and the shell of the 1.5V rechargeable battery 1 has an exposed portion 12 that is not covered by the insulating outer layer 11. Specifically, a section of the shell is left on the negative electrode side of the 1.5V rechargeable battery 1 that is not covered with the insulating outer layer 11. This section is the exposed portion 12. When the 1.5V rechargeable battery 1 is installed, the battery type detection contact A can just contact the exposed portion 12, so that the exposed portion 12 and the battery type detection contact A are electrically connected, thereby connecting the negative electrode contact P3 of the 1.5V rechargeable battery 1 and the charging negative electrode contact P5 of the charging interface, that is, the charging circuit can be connected normally, and the charging function of the 1.5V rechargeable battery 1 is realized. The battery type detection contact A can be a resilient metal contact so as to achieve better electrical connection with the exposed portion 12. The positive charging contact P1, the negative charging contact P5, the positive contact P2 and the negative contact P3 are also resilient metal contacts.

[0028] like Figure 2 As shown, in this embodiment, the model of the boost converter U1 is AP2065ATCER. The 1.5V battery B1 generates a 2.9V DC voltage through the boost converter U1 to provide power for various circuits of the intercom. The output voltage is set to 2.9V output instead of a higher voltage through the peripheral parameters of the boost converter U1, which can not only meet the normal use of various circuits of the intercom, but also reduce power consumption and increase the battery life.

[0029] The positive contact P2 of the 1.5V battery B1 is connected to the input end (pin 6) of the boost converter U1 through the inductor L2. The inductor L2 is also connected to the switch pin (pin 1) of the boost converter U1 through the inductor L1. The second pin of the boost converter U1 is grounded, the third pin is the feedback input pin, and the feedback input pin is grounded through the resistor R12. The fourth pin of the boost converter U1 is the output enable pin (high level turns on, low level turns off), the fourth pin of the boost converter U1 is connected to one end of the power switch S2 and is grounded through the capacitor C15, and the other end of the power switch S2 is connected to the power supply BAT1V2 of the 1.5V battery B1. The fifth pin of the boost converter U1 is its output pin, and this output pin is respectively connected to the low voltage protection unit through the inductor L3. In this embodiment, the minimum input voltage of the low voltage protection unit is set to 2.1V.

[0030] Specifically, the low voltage protection unit is mainly composed of a dual diode D5 (DA221), a band-resistance NPN transistor Q2 (DTC114EE) and a field effect transistor Q3. When working, the output voltage of the boost converter U1 is divided into two paths. One path provides a high level for the G pole of the field effect transistor Q3 through the resistor R6, so that the S pole and the D pole of the field effect transistor Q3 cannot be turned on, the voltage is not output, and the power supply of various parts of the intercom is cut off, which is equivalent to the shutdown state; the other path is input from the first pin of the dual diode D5, and output from the third pin of the dual diode D5 after passing through the internal dual diode. After the output, it enters the B pole of the band-resistance NPN transistor Q2 to control the C pole and the E pole of the band-resistance NPN transistor Q2 to turn on. The conduction voltage of the band-resistance NPN transistor Q2 (DTC114EE) needs to be greater than 0.7V, and there will be a voltage drop of 1.4V after passing through the dual diode D5 (DA221), so the input from the first pin of the dual diode D5 The voltage needs to be greater than 2.1V to meet the conduction condition of the band-resistance NPN transistor Q2, that is, when the voltage input from the first pin of the dual diode D5 is greater than or equal to 2.1V, the band-resistance NPN transistor Q2 is turned on, and thus the field effect transistor Q3 is turned on, and the low-voltage protection unit generates a 2.9V power supply output, and the intercom starts normally. When the voltage input from the first pin of the dual diode D5 is less than 2.1V, the band-resistance NPN transistor Q2 is not turned on, and the field effect transistor Q3 is also unable to turn on. The low-voltage protection unit cannot generate a power supply output, and the intercom is shut down. Since the minimum output voltage of the boost converter U1 is 2.6V and the maximum duty cycle is 80%, this means that when the input voltage is less than 0.52V, its boost function will fail, and the output voltage of the boost converter U1 is equal to the input voltage, and the input voltage of 0.52V is not enough to turn on the field effect transistor Q3, thus avoiding abnormal operation or freezing of the intercom due to too low voltage.

[0031] After adopting the above scheme, the 1.5V powered intercom and its power supply system of the present invention adopts 1.5V battery power supply, which can be called the minimum power supply scheme, thereby achieving energy saving and environmental protection. Moreover, its power supply mode is very flexible, and it can be powered by 1.5V rechargeable battery or the most commonly used 1.5V dry battery on the market. It is very convenient to buy replacement batteries, thereby achieving the minimum use cost.

[0032] Moreover, a battery type detection contact A is cleverly provided in the power supply system. The battery type detection contact A is provided at a position corresponding to the outer surface of the 1.5V battery B1. When the 1.5V battery B1 is installed, the battery type detection contact A will contact the outer surface of the battery. When a 1.5V dry battery is used for power supply, the battery type detection contact A contacts the insulating outer layer 21 that completely covers the shell of the 1.5V dry battery. The negative contact P3 of the 1.5V dry battery and the negative charging contact P5 of the charging interface are in an open state, and the 1.5V dry battery used will not be charged, ensuring the safe use of the 1.5V dry battery; when a 1.5V rechargeable battery is used for power supply, the shell of the 1.5V rechargeable battery used is provided with an exposed portion 12 that can be electrically connected to the battery type detection contact A correspondingly, thereby connecting the path between the negative contact P3 of the 1.5V rechargeable battery and the negative charging contact P5 of the charging interface, so that the charging circuit can be closed and the 1.5V rechargeable battery used can be charged.

[0033] When using, if the user cannot find the replacement 1.5V rechargeable battery with the exposed portion 12 of the present invention, the user can directly use a common 1.5V rechargeable battery on the market and tear off the insulating outer layer 11 of the corresponding part by himself.

[0034] Furthermore, the present invention provides a low voltage protection unit in the power supply system to prevent the power supply output voltage output by the boost converter from being too low to drive various circuits of the intercom, causing abnormal operation or crash of the intercom.

[0035] Embodiment 2: The present invention is a 1.5V powered intercom power supply system, see Example 2 Figure 3 , Figure 4 and Figure 5 .

[0036] like Figure 3 As shown, the difference between this embodiment and the first embodiment is that: it also includes a battery replacement detection unit, a soft switch controller and a switch controller, the input end of the battery replacement detection unit is connected to the output end of the 1.5V battery, the microprocessor of the walkie-talkie is provided with a battery usage time accumulation module, the battery usage time accumulation module has a reset detection input end for resetting the accumulation time, and the output end of the battery replacement detection unit is connected to the reset detection input end; The output end of the microprocessor is connected to the control end of the soft switch controller, the output end of the soft switch controller is connected to the control end of the switch controller, and the output end of the switch controller is connected to the output enable pin of the boost converter.

[0037] like Figure 4As shown, the switch controller adopts a band-resistance PNP transistor Q1, the battery replacement detection unit is mainly composed of an electrolytic capacitor E2, a diode D2, a PNP transistor Q4, a resistor R8, a band-resistance NPN transistor Q5, a band-resistance NPN transistor Q6 and a resistor R3, and the soft switch controller adopts a band-resistance NPN transistor Q7.

[0038] The output enable pin (pin 4) of the boost converter U1 is connected to the C pole of the band-resistance PNP transistor Q1, the power supply BAT1V2 of the 1.5V battery B1 is connected to the E pole of the band-resistance PNP transistor Q1, the B pole of the band-resistance PNP transistor Q1 is respectively connected to the positive pole of the diode D4, the C pole of the band-resistance NPN transistor Q5 and the C pole of the band-resistance NPN transistor Q7, the negative pole of the diode D4 is connected to one end of the power switch S2 and the negative pole of the diode D3, the positive pole of the diode D3 is connected to one end of the resistor R2 and the AD sampling end of the microprocessor, the other end of the resistor R2 is connected to the 2.9V power supply output end of the low-voltage protection unit, the other end of the power switch S2 is grounded, the E pole of the band-resistance NPN transistor Q7 is grounded, and the B pole of the band-resistance NPN transistor Q7 is connected to the control end of the microprocessor.

[0039] The 4th pin of the boost converter U1 is the output enable pin, which is turned on when the level is high and turned off when the level is low. The power supply BAT1V2 of the 1.5V battery B1 is connected to the E pole of the band-resistance PNP transistor Q1, and provides a high level for the B pole of the band-resistance PNP transistor Q1 through the built-in resistor of the band-resistance PNP transistor Q1. At this time, the band-resistance PNP transistor Q1 is in the cut-off state, and the C pole of the band-resistance PNP transistor Q1 is at a low level, that is, the 4th pin of the boost converter U1 is at a low level, the output of the boost converter U1 is turned off, and the intercom is in the off state. When the power switch S2 is pressed, the power switch S2 is turned on, and the high level of the B pole of the band-resistance PNP transistor Q1 is pulled down through the diode D4, so that the C pole and the E pole of the band-resistance PNP transistor Q1 are turned on, and the C pole of the band-resistance PNP transistor Q1 is at a high level, that is, the 4th pin of the boost converter U1 is at a high level, which turns on the output of the boost converter U1, and the intercom is powered and in the on state.

[0040] The power supply BAT1V2 of the 1.5V battery B1 is respectively connected to the cathode of the diode D2, the E pole of the PNP transistor Q4 and the E pole of the band-resistance PNP transistor Q1, the anode of the diode D2 is respectively connected to the anode of the electrolytic capacitor E2 and one end of the resistor R7, the other end of the resistor R7 is connected to the B pole of the PNP transistor Q4, the cathode of the electrolytic capacitor E2 is grounded, the first end of the resistor R8 is grounded, the second end of the resistor R8 is respectively connected to the B pole of the band-resistance NPN transistor Q5, the C pole of the PNP transistor Q4 and the B pole of the band-resistance NPN transistor Q6, the E pole of the band-resistance NPN transistor Q6 is grounded, the C pole of the band-resistance NPN transistor Q6 is connected to one end of the resistor R3 and the input end of the microprocessor, and the other end of the resistor R3 is connected to the 2.9V power supply output end of the low-voltage protection unit. The microprocessor is provided with a battery usage time accumulation module, and the battery usage time accumulation module has a reset detection input terminal for resetting the accumulation time, and the C pole of the band-resistance NPN transistor Q6 is connected to the reset detection input terminal.

[0041] When the old battery to be replaced is removed, the electricity stored in the electrolytic capacitor E2 is quickly discharged through the diode D2. When the new battery is successfully installed, whether the walkie-talkie is in the off state or the on state, the power supply BAT1V2 of the 1.5V battery B1 first charges the electrolytic capacitor E2 through the resistors R5 and R7. The charging process gives the B pole of the PNP transistor Q4 a low level time, so that the E pole and C pole of the PNP transistor Q4 can be turned on. The power supply BAT1V2 of the 1.5V battery B1 flows from the E pole of the PNP transistor Q4 to the C pole, and at the same time gives the B pole of the band-resistance NPN transistor Q5 a high level, so that the C pole and E pole of the band-resistance NPN transistor Q5 can be turned on, and the high level of the B pole of the band-resistance PNP transistor Q1 is pulled down, so that the C pole and E pole of the band-resistance PNP transistor Q1 are turned on, and the C pole of the band-resistance PNP transistor Q1 becomes a high level, that is, the 4th foot of the boost converter U1 is high, the output of the boost converter U1 is turned on, and the walkie-talkie is powered. The microprocessor starts working and immediately sends a high level to the B pole of the NPN transistor Q7, so that the B pole of the PNP transistor Q1 can be continuously pulled down, maintaining the power supply output of the boost converter U1, and realizing soft startup in the shutdown state, that is, when the power switch S2 is turned off, the microprocessor can still maintain normal operation, so that the battery type can be detected when the battery is replaced. At the same time, the power supply BAT1V2 of the 1.5V battery B1 passes from the E pole of the PNP transistor Q4 to the C pole and also gives a high level to the B pole of the NPN transistor Q6, so that the C pole and the E pole of the NPN transistor Q6 can be turned on, and the high level connected to the C pole of the NPN transistor Q6 through the resistor R3 is pulled down. The microprocessor detects that the high level on the C pole of the NPN transistor Q6 is pulled down, which means that the battery has been replaced, and sends a command to reset the accumulated time.

[0042] Embodiment three: A power supply system for a 1.5V powered intercom of the present invention, see Example 3 Figure 4 .like Figure 4 As shown, the difference between this embodiment and embodiment 1 or embodiment 2 is that: the battery type detection unit also includes a resistor R4 and a resistor R9, the battery type detection contact A is respectively connected to one end of the resistor R4 and one end of the resistor R9, the other end of the resistor R4 is connected to the D pole of the field effect transistor Q3 and the power supply output end, and the other end of the resistor R9 is connected to the battery type detection input end of the microprocessor, and the microprocessor is provided with corresponding power calculation modules according to different battery types.

[0043] When the 1.5V rechargeable battery 1 of the present invention is used, the battery type detection contact A contacts the exposed portion 12 of the 1.5V rechargeable battery 1, which is equivalent to the battery negative electrode contact P3 of the 1.5V battery B1 being connected to the battery type detection contact A, that is, the battery type detection contact A is connected to the ground, and the high level of 2.9V on the resistor R4 is pulled down. The microprocessor detects that the level of the battery type detection contact A changes from a high level to a low level, thereby determining that the battery installed in the intercom is a rechargeable battery, so that the microprocessor can select to call the power calculation module of the rechargeable battery.

[0044] A 1.5V powered intercom of the present invention, such as Figure 6 As shown, it includes a power supply system and various circuit parts that are powered by the power supply system and can realize the intercom function. The power supply system adopts any 1.5V power supply system of the walkie-talkie in the previous embodiments, and the various circuit parts adopt energy-saving circuits.

[0045] Furthermore, the operating voltage requirement of each circuit is no more than 2.9V.

[0046] Further, the intercom includes the power supply system, antenna interface, transceiver circuit, radio frequency integrated circuit, audio amplifier, speaker, microphone and microprocessor; The power supply system provides working power for the microprocessor, the radio frequency integrated circuit, the audio amplifier and the transceiver circuit, and the microprocessor, the radio frequency integrated circuit, the audio amplifier and the transceiver circuit all adopt energy-saving circuits; The antenna interface is bidirectionally connected to the transceiver circuit, the transceiver circuit is bidirectionally connected to the radio frequency integrated circuit, the radio frequency integrated circuit is bidirectionally connected to the microprocessor, the audio output end of the radio frequency integrated circuit is connected to the input end of the audio amplifier, the output end of the audio amplifier is connected to the speaker, and the output end of the microphone is connected to the audio input end of the radio frequency integrated circuit.

[0047] Furthermore, the model of the microprocessor is HC32L130J8TA, which supports an operating voltage of 1.8~5.5V, has a flexible power consumption management system, and ultra-low power consumption performance; the model of the radio frequency integrated circuit is BK4819, which supports an operating voltage of 2.6~3.6V; the model of the audio amplifier is BU7150NUV, which supports an operating voltage of 0.93~3.5V, so the boost converter in the power supply system of the present invention selects a boost converter U1 with a minimum output voltage of 2.6V.

[0048] In the present invention, corresponding power calculation modules are respectively provided in the microprocessor according to different battery types, and the corresponding power calculation module can be selectively called according to the input battery type detection signal. In addition, a battery usage time accumulation module is provided in the microprocessor, and the battery usage time accumulation module can reset the accumulated time according to the instruction received by its reset control terminal. These are conventional technical means in the field, and the present invention does not improve them.

[0049] In the present invention, the calculation result (remaining power) of the power calculation module in the microprocessor can be displayed on the screen of the intercom. The accumulation result (used time) of the battery usage time accumulation module in the microprocessor can also be displayed on the screen of the intercom. These are also conventional technical means in the field, and the present invention does not improve them.

[0050] The embodiments described in the present invention are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments shown, it can be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the scope of protection of the present invention.

Claims

1. A 1.5V powered intercom power supply system, characterized in that: It includes a charging interface, a battery type detection unit, a 1.5V battery, a boost converter, a low voltage protection unit and a power switch. The charging interface is connected to the input end of the 1.5V battery through the battery type detection unit, the output end of the 1.5V battery is connected to the input end of the boost converter, the output end of the boost converter is connected to the input end of the low voltage protection unit, the output end of the low voltage protection unit is the power supply output end, which is used to provide working power for various circuits of the walkie-talkie, and the power switch is connected to the output enable pin of the boost converter; The battery type detection unit is provided with a battery type detection contact, the battery type detection contact is connected to the negative charging contact of the charging interface, the negative contact of the 1.5V battery is provided corresponding to the battery type detection contact and the two are in an open state; The 1.5V battery is a 1.5V rechargeable battery or a 1.5V dry cell; The battery shell of the 1.5V rechargeable battery has an exposed portion that is not covered by an insulating outer layer; the exposed portion is electrically connected to the battery type detection contact corresponding to the battery type detection contact, thereby connecting the path between the negative contact of the 1.5V battery and the negative charging contact of the charging interface.

2. The power supply system of a 1.5V powered intercom according to claim 1, characterized in that: It also includes a battery replacement detection unit, a soft switch controller and a switch controller, wherein the input end of the battery replacement detection unit is connected to the output end of the 1.5V battery, a battery usage time accumulation module is provided in the microprocessor of the intercom, and the battery usage time accumulation module has a reset detection input end for resetting the accumulation time, and the output end of the battery replacement detection unit is connected to the reset detection input end; The output end of the microprocessor is connected to the control end of the soft switch controller, the output end of the soft switch controller is connected to the control end of the switch controller, and the output end of the switch controller is connected to the output enable pin of the boost converter.

3. The power supply system of a 1.5V powered intercom according to claim 1, characterized in that: The output end of the battery type detection unit is connected to the battery type detection input end of the microprocessor, and the microprocessor is provided with corresponding power calculation modules according to different battery types.

4. The power supply system of a 1.5V powered intercom according to claim 2, characterized in that: The output end of the battery type detection unit is connected to the battery type detection input end of the microprocessor, and the microprocessor is provided with corresponding power calculation modules according to different battery types.

5. The power supply system of a 1.5V powered intercom according to claim 1, characterized in that: The model of the boost converter is AP2065ATCER, which is configured to output a 2.9V DC voltage.

6. The power supply system of a 1.5V powered intercom according to claim 1, characterized in that: The minimum input voltage of the low voltage protection unit is 2.1V. When the input voltage is less than 2.1V, the low voltage protection unit stops working.

7. A 1.5V powered intercom, characterized in that: It includes a power supply system and various circuits that are powered by the power supply system and can realize the intercom function. The power supply system adopts the power supply system of a 1.5V-powered walkie-talkie as described in any one of claims 1-6, and each circuit adopts an energy-saving circuit.

8. The 1.5V powered intercom according to claim 7, characterized in that: The operating voltage requirement of each circuit is no more than 2.9V.

9. The 1.5V powered intercom according to claim 7, characterized in that: The intercom includes the power supply system, antenna interface, transceiver circuit, radio frequency integrated circuit, audio amplifier, speaker, microphone and microprocessor; The power supply system provides working power for the microprocessor, the radio frequency integrated circuit, the audio amplifier and the transceiver circuit, and the microprocessor, the radio frequency integrated circuit, the audio amplifier and the transceiver circuit all adopt energy-saving circuits; The antenna interface is bidirectionally connected to the transceiver circuit, the transceiver circuit is bidirectionally connected to the radio frequency integrated circuit, the radio frequency integrated circuit is bidirectionally connected to the microprocessor, the audio output end of the radio frequency integrated circuit is connected to the input end of the audio amplifier, the output end of the audio amplifier is connected to the speaker, and the output end of the microphone is connected to the audio input end of the radio frequency integrated circuit.

10. The 1.5V powered intercom according to claim 9, characterized in that: The model of the microprocessor is HC32L130J8TA, the model of the radio frequency integrated circuit is BK4819, and the model of the audio amplifier is BU7150NUV.

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