Multi-family call control detection module for two-wire talkback

Abstract

A multi-family call control detection module for two-wire talkback relates to the technical field of multi-family call talkback doorbells, and can detect the magnitude of voltage to confirm the state of each channel, achieve the access of a plurality of indoor units without conflicts, enable users to see higher-definition images, and effectively reduce the number of wires. In the two-wire talkback multi-family call control detection module, a call and detection circuit unit is used for executing functions of calling, call detection and indoor unit power supply work detection after calling; the power supply and control unit is used as a high-low voltage control switch for supplying power to the indoor unit, and meets the switching requirements of each channel when multiple households exist; the standby discharging unit is used for rapidly discharging when the voltage of the channel is higher than 5V during standby so as to achieve the purpose that the voltage is lower than 5V during standby and no longer discharging when the voltage is lower than 5V; and the MCU power supply control unit is used for supplying power to the MCU and controlling the MCU through a switching circuit so as to prevent the MCU from being burnt out due to overhigh voltage.

Description

Technical Field

[0001] The invention relates to the technical field of multi-household call intercom doorbells, and in particular to a multi-household call control detection module for two-line intercoms. Background Art

[0002] At present, traditional wired video intercom systems generally simulate two-line ordinary HD images, which cannot achieve high-definition effects. Analog HD requires more than 4 wires or network cables, with different wire sequences. The installation consumes more wires and costs, and the installation is also complicated and costly. Ordinary users cannot install it by themselves, which brings a bad experience to users. It is even more difficult to achieve two-line analog HD in buildings. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-household call control detection module for two-line intercom, which can detect the voltage to confirm the status of each channel, and complete signal switching through the control of MCU and its own hardware, so as to achieve multiple indoor units access without conflict, and realize the function of a small building intercom system; it can enable users to see higher-definition images, and effectively reduce the number of wiring, so that users can complete the wiring operation by themselves.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme: A multi-household call control detection module for two-line intercom, comprising: A calling and detection circuit unit, which is used to perform calling, calling detection, and indoor unit power supply operation detection functions after calling; A power supply and control unit, which is used as a high and low voltage control switch for power supply from the indoor unit to meet the switching requirements of each channel when there are multiple households; A standby discharge unit, which is used to quickly discharge the voltage of the channel when it is in standby mode when it is higher than 5V, so as to achieve a voltage lower than 5V when it is in standby mode, and stop discharging when it is lower than 5V; MCU power supply control unit, the MCU power supply control unit is used to supply power to the microcontroller MCU, and control it by switching circuits to prevent the microcontroller MCU from burning out due to excessive voltage; Among them, connector J1 is the port connected to the indoor unit. Two voltages are transmitted from the indoor unit to the door unit, one is the standby voltage of 5V, and the other is the working voltage of 26V. In standby mode, 5V voltage is input from both ends of connector J1, and the voltage polarity is selected by bridge D1, and the positive pole is output to the INDOOR1 network. Specifically, the signal and voltage of the indoor unit are input from the connector J1 and enter the power supply and control unit. The pins 1 and 2 of the connector J1 are connected to the pins 2 and 3 of the bridge D1. After the polarity of the bridge D1 is selected, the positive voltage is output from the pin 1 of the bridge D1 and the pin 4 is grounded. The positive voltage output from the pin 1 of the bridge D1 is connected to the positive electrode of the diode D4, the negative electrodes of the Zener diodes DZ3 and DZ4, the E pole of the transistor Q1, the resistor R4, and one end of the resistor R6. The voltage zener diode DZ2, the resistor R7, the resistor R15, the transistor Q6, the capacitor C4, the resistor R6, the transistor Q4, and the resistor R4 form the control authority for controlling the transistor Q1 in standby and working mode; the transistor Q1 is turned on in standby mode, and the control of the transistor Q1 is turned off in working mode, and the control right is handed over to the microcontroller MCU.

[0005] In actual application, when the voltage transmitted from the indoor unit is 5V, and when the voltage of the voltage zener diode DZ2 does not exceed 8V, the positive electrode of the voltage zener diode DZ2 is connected to the resistor R7, and the other end of the resistor R7 is connected to the resistor R15 and the B pole of the transistor Q6, and the other end of the resistor R15 is grounded. Since the B pole of the transistor Q6 has no electricity, the C pole and the E pole are not conducting, and the E pole is grounded, then under this voltage condition, the transistor Q6 cannot control the transistor Q4; When the voltage transmitted from the indoor unit is 26V, and when the voltage of the voltage-stabilizing diode DZ2 exceeds 8V, the B pole of the transistor Q6 is energized, and the C pole and the E pole are turned on, then the transistor Q6 controls the transistor Q4, so that the transistor Q4 loses the control right over the transistor Q1 during operation; one end of the resistor R6 is connected to INDOOR1, and the other end of the resistor R6 is connected to the B pole of the transistor Q4 and the C pole of the transistor Q6, as well as one end of the capacitor C4. When transistor Q4 is at 5V, the B pole is energized, the C pole and the E pole are turned on, and the E pole is grounded. The other ends of resistors R4 and R5 are connected to the C pole of transistor Q4, and the C pole of transistor Q4 is connected to the C pole of transistor Q5. After transistor Q4 is turned on, the C pole is grounded, and the B pole of transistor Q1 is connected to one end of resistor R5, resulting in a low-impedance voltage formed at the B pole of transistor Q1 to the ground, thereby turning on the C pole and the E pole of transistor Q1. The 5V voltage transmitted by the C pole is connected to the positive pole of diode D5, one end of resistor R2, and the negative pole of diode D5 is connected to the subsequent POW-OUT, and the high-impedance POC circuit unit is connected to the POW-OUT, and the high-impedance POC circuit unit is connected to the voltage conversion unit.

[0006] Among them, the B pole of the transistor Q5 is connected to one end of the resistor R10, the C pole is connected to the resistor R5, the E pole is grounded, and the other end of the resistor R10 is connected to INDOOR1-AV-OF. This signal is connected to the control pin of the microcontroller MCU, and the microcontroller MCU controls this channel; When the whole machine is on standby, the microcontroller MCU does not control, and controls the conduction of the transistor Q1 through the transistor Q4, so that the 5V voltage is normally supplied to the MCU power supply control unit, so that the microcontroller MCU has voltage to work normally; when the whole machine is to work, the input voltage reaches 26V, and the microcontroller MCU controls the on and off of the transistor Q5, and opens it when the channel is working, and closes it when the channel is not working.

[0007] Specifically, in the standby discharge unit, the voltage stabilizing diode DZ4, the resistor R16, the resistor R17, the transistor Q10, the transistor Q11, and the resistor R20 form a standby discharge circuit; When the voltage on the INDOOR1 network is greater than 6V, the voltage-stabilizing diode DZ4 conducts the voltage greater than 6V, the cathode of the voltage-stabilizing diode DZ4 is connected to the resistor R16, the other end of the resistor R16 is connected to the C pole of the transistor Q10, the E pole of the transistor Q10 is grounded, the B pole is connected to the resistor R17 and the C pole of the transistor Q11, the other end of the resistor R17 is connected to the MCUVCC, the B pole of the transistor Q11 is connected to the resistor R20, the E pole of the transistor Q11 is grounded, the other end of the resistor R20 is connected to the INDOOR1-AV-OF network, and the microcontroller MC U is used to control it. It is high level when working and low level when not working. When the whole machine is working, the B pole of transistor Q11 is high level, transistor Q11 is turned on, the B pole of transistor Q10 is low level, transistor Q10 is not turned on, and no discharge occurs. When the INDOOR1-AV-OF network is at a low level, the B pole of transistor Q11 is low level, transistor Q11 is not turned on, the B pole of transistor Q10 is high level, transistor Q10 is turned on, and discharges, and the voltage on the INDOOR1 network immediately drops below 6V and no longer drops, so as to ensure the normal standby 5V power supply.

[0008] Furthermore, in the MCU power supply control unit, the voltage from the transistor Q1 is connected to the resistor R2, the other end of the resistor R2 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to one end of the self-resetting fuse FU1. When the current exceeds a certain value, it automatically protects and disconnects to achieve the effect of protecting the subsequent stage; the other end of the self-resetting fuse FU1 is connected to the S pole of the transistor Q3, the resistor R8, and one end of the resistor R12. When AA5V has no power, the resistor R13 connected to AA5V and the positive electrode of the transistor Q7 also have no power, and the power The other end of the resistor R13 is connected to the resistor R18 and the B pole of the transistor Q9. The other end of the resistor R18 is connected to the ground. The B pole of the transistor Q9 is not powered, the C pole and the E pole of the transistor Q9 are not conducting, the E pole of the transistor Q9 is grounded, the C pole is connected to the B pole of the transistor Q7 and one end of the resistor R12, and the other end of the resistor R12 is connected to MCUVCC-2, that is, connected to the S pole of the transistor Q3, so that the B pole of the transistor Q7 is a high voltage, and the C pole and the E pole of the transistor Q7 are conducting; the E pole of the transistor Q7 is grounded, and the C pole is connected to the resistor R8, the One end of resistor R11 is connected, and the other end of resistor R11 is connected to the G pole of transistor Q3 and one end of ESD1. The other end of ESD1 is grounded. The function of ESD1 is to protect the MOS tube of transistor Q3. After the C pole and E pole of transistor Q7 are turned on, the G pole of transistor Q3 forms a low impedance through resistor R11, and the S and D channels of transistor Q3 are opened and turned on. The 5V voltage is connected to the cathode of Zener diode DZ5 through the D pole of transistor Q3. The anode of Zener diode DZ5 is grounded. The function of DZ5 is to protect the input voltage to be stable within an acceptable range; the D pole of the transistor Q3 is connected to the capacitor C2, the capacitor C3, the diode D7, and one end of the voltage regulator U1, and the other ends of the capacitors C2 and C3 are grounded. The function of the capacitors C2 and C3 is to filter the voltage. Since the positive electrode of the diode D7 has no electricity, the diode D7 is in a reverse biased state. The voltage regulator U1 stabilizes the voltage of the input pin 2 at 3.3V, the pin 1 of the voltage regulator U1 is grounded, and the output voltage MCUVCC of the pin 3 of the voltage regulator U1 supplies power to the microcontroller MCU; When the indoor unit is powered by 26V and POW-OUT is 26V, the internal voltage conversion unit provides a AA5V voltage. At this time, the positive electrode of the diode D7 has a 5V voltage, which provides a 5V voltage to the voltage regulator U1; the resistor R13 connected to another AA5V provides a voltage to the B pole of the transistor Q9, so that the C pole and the E pole of the transistor Q9 are turned on, and the B pole of the transistor Q7 has no voltage. The transistor Q7 is not turned on, and the G pole of the transistor Q3 is a high voltage, which is equal to the S pole voltage of the transistor Q3, causing the transistor Q3 to be turned off and the voltage cannot pass, that is, the 26V voltage cannot pass, so as to protect the subsequent components from being damaged by high voltage and to provide a stable voltage for the microcontroller MCU at both high and low voltages.

[0009] Furthermore, in the calling and detecting circuit unit, the diode D4, the resistor R3, the transistor Q2, and the KEY1 constitute a calling circuit, the voltage-stabilizing diode DZ3, the resistor R19, the resistor R14, the transistor Q8, and the resistor R9 constitute an indoor unit power supply detection and control circuit, and the diode D2, the capacitor C1, the voltage-stabilizing diode DZ1, and the resistor R1 constitute a door unit calling detection circuit; In standby mode, the voltage transmitted by diode D4 is 5V, and voltage regulator diode DZ3 can pass voltage greater than 6V, that is, 5V voltage cannot pass. The positive pole of voltage regulator diode DZ3 is connected to resistor R14 and resistor R19, and the other end of resistor R19 is grounded. The other end of resistor R14 is connected to the B pole of transistor Q8, and the E pole of transistor Q8 is grounded. The C pole of transistor Q8 is connected to resistor R9, the control IO port of microcontroller MCU, and the B pole of transistor Q2. The other end of resistor R9 is connected to MCUVCC. When there is no power from resistor R14, transistor Q8 is not turned on, and the C pole of transistor Q8 is at a high level. The IO port of microcontroller MCU detects a high level and thinks that it is in standby mode. The C pole and E pole of transistor Q2 are turned on, and the C pole of transistor Q2 is at a high level. Connect one end of resistor R3, and the other end of resistor R3 is connected to the cathode of diode D4. After transistor Q2 is turned on, if the visitor presses KEY1 to call the user, the 5V voltage supplied by the indoor unit will be pulled down. The C pole of transistor Q2 is connected to the anode of diode D2, and the cathode of diode D2 is connected to capacitor C1, voltage-stabilizing diode DZ1, and resistor R1. The other ends of capacitor C1 and voltage-stabilizing diode DZ1 are grounded, and the other end of resistor R1 is connected to MCUVCC. The cathode network of diode D2 is connected to the IO port of microcontroller MCU. The IO port of microcontroller MCU is used to determine whether there is a call. When KEY1 calls the user, the signal voltage of ROOM1-CALL will be pulled down accordingly. At this time, the microcontroller MCU believes that there is a call and makes corresponding control. After the indoor unit detects that the 5V voltage is pulled low, it will start working and supply 26V voltage to the door unit to start working. After the indoor unit supplies 26V voltage, the voltage regulator diode DZ3 detects that it exceeds 6V and will provide voltage to the transistor Q8 to turn on the transistor Q8. At this time, the C pole of the transistor Q8 has no electricity, and the IO port of the microprocessor MCU connected to the INDOOR1-POWER-TEST network is at a low level. The microprocessor MCU thinks it can work. At the same time, the B pole of the transistor Q2 has no electricity. At this time, KEY1 is not allowed to call again to complete the control action of call detection.

[0010] Compared with the prior art, the multi-household call control detection module for two-line intercom described in the present invention has the following advantages: In the multi-household call control detection module of the two-line intercom provided by the present invention, since J1 is the port for connecting the indoor unit, there are two voltages input from the indoor unit, one is the standby voltage of 5V, and the other is the working voltage of 26V to the door machine; in standby, 5V voltage is input from the two ends of J1, the voltage polarity is selected through the bridge D1, and the positive pole is output to the INDOOR1 network; the call and detection circuit unit can execute the calling, call detection, and indoor unit power supply work detection functions after calling, and this unit completes the calling and detection functions; the power supply and control unit completes the high and low voltage control switch of the power supply from the indoor unit, and meets the switching requirements of each channel when there are multiple households; when the indoor unit is working and entering standby, the standby discharge unit is turned off because the load of the door machine module is turned off, and the current in the circuit is very low, resulting in the indoor unit voltage cannot be immediately reduced to below 5V after working and entering standby, which will cause the call detection circuit to fail to work normally. In this case, the A discharge circuit in standby mode is designed. When the voltage of this channel is higher than 5V in standby mode, the circuit will discharge quickly to achieve a voltage lower than 5V in standby mode. When it is lower than 5V, it will not discharge again, so that the calling and detecting circuit unit can work normally and can call again immediately; the MCU power supply control unit is mainly a control circuit for supplying power to the MCU, because the indoor unit is powered by 5V in standby mode and 26V in operation. This voltage difference is large, and a switching circuit is required to control it to prevent the MCU from being burned out due to excessive voltage; therefore, the multi-household call control and detection module of the two-line intercom provided by the present invention can detect the voltage to confirm the status of each channel, and complete signal switching through the control of the MCU and the control of its own hardware, so as to achieve multiple indoor units connected without conflict, and realize the function of a small building intercom system at the same time; it can enable users to see higher-definition images, and effectively reduce the number of wiring, so that users can complete the wiring operation by themselves. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of a multi-household call control detection module for two-line intercom provided in an embodiment of the present invention.

[0012] Reference numerals: 101 - calling and detection circuit unit; 102 - power supply and control unit; 103 - standby discharge unit; 104 - MCU power supply control unit. DETAILED DESCRIPTION

[0013] For ease of understanding, the multi-household call control detection module for two-line intercom provided by an embodiment of the present invention is described in detail below in conjunction with the accompanying drawings of the specification.

[0014] The embodiment of the present invention provides a multi-household call control detection module for two-line intercom, such as Figure 1As shown, it includes: a calling and detection circuit unit 101, which is used to perform calling, calling detection, and indoor unit power supply work detection functions after calling; A power supply and control unit 102, which is used as a high and low voltage control switch for power supply from the indoor unit to meet the switching requirements of each channel when there are multiple households; A standby discharge unit 103, which is used to quickly discharge the voltage of the channel when it is in standby mode when it is higher than 5V, so as to achieve a voltage lower than 5V when it is in standby mode, and stop discharging when it is lower than 5V; MCU power supply control unit 104, the MCU power supply control unit 104 is used to supply power to the microcontroller MCU, and control it by switching circuits to prevent the microcontroller MCU from burning out due to excessive voltage; Among them, connector J1 is the port connected to the indoor unit. Two voltages are transmitted from the indoor unit to the door unit, one is the standby voltage of 5V, and the other is the working voltage of 26V. In standby mode, 5V voltage is input from both ends of connector J1, and the voltage polarity is selected by bridge D1, and the positive pole is output to the INDOOR1 network. Specifically, the signal and voltage of the indoor unit are input from the connector J1 and enter the power supply and control unit 102. The pins 1 and 2 of the connector J1 are connected to the pins 2 and 3 of the bridge D1. After the polarity of the bridge D1 is selected, the positive voltage is output from the pin 1 of the bridge D1 and the pin 4 is grounded. The positive voltage output from the pin 1 of the bridge D1 is connected to the positive electrode of the diode D4, the negative electrodes of the Zener diodes DZ3 and DZ4, the E pole of the transistor Q1, the resistor R4, and one end of the resistor R6. The voltage zener diode DZ2, the resistor R7, the resistor R15, the transistor Q6, the capacitor C4, the resistor R6, the transistor Q4, and the resistor R4 form the control authority for controlling the transistor Q1 in standby and working mode; the transistor Q1 is turned on in standby mode, and the control of the transistor Q1 is turned off in working mode, and the control right is handed over to the microcontroller MCU.

[0015] Compared with the prior art, the multi-household call control detection module for two-line intercom described in the embodiment of the present invention has the following advantages: In the multi-household call control detection module of the two-line intercom provided by the embodiment of the present invention, since J1 is the port connected to the indoor unit, there are two voltages input from the indoor unit, one is the standby voltage of 5V, and the other is the working voltage of 26V to the door machine; in standby, 5V voltage is input from the two ends of J1, the voltage polarity is selected through the bridge D1, and the positive pole is output to the INDOOR1 network; the call and detection circuit unit can execute the calling, call detection, and indoor unit power supply detection functions after calling, and this unit completes the calling and detection functions; the power supply and control unit completes the high and low voltage control switch of the power supply from the indoor unit to meet the switching requirements of each channel when there are multiple households; when the indoor unit is working and entering standby, the standby discharge unit is turned off because the load of the door machine module is turned off, and the current in the circuit is very low, resulting in the indoor unit voltage cannot be immediately reduced to below 5V after working and entering standby, which will cause the call detection circuit to fail to work normally. In this case, A discharge circuit in standby mode is designed. When the voltage of this channel is higher than 5V in standby mode, the circuit will discharge quickly to achieve a voltage lower than 5V in standby mode. When it is lower than 5V, it will not discharge again, so that the call and detection circuit unit can work normally and can call again immediately; the MCU power supply control unit is mainly a control circuit that supplies power to the MCU, because the indoor unit is powered by 5V in standby mode and 26V in operation. This voltage difference is large, and a switching circuit is required to control it to prevent the MCU from being burned out due to excessive voltage; therefore, the multi-household call control detection module of the two-line intercom provided in the embodiment of the present invention can detect the voltage to confirm the status of each channel, and complete signal switching through the control of the MCU and the control of its own hardware, so as to achieve multiple indoor units connected without conflict, and realize the function of a small building intercom system at the same time; it can enable users to see higher-definition images, and effectively reduce the number of wiring, so that users can complete the wiring operation by themselves.

[0016] In practical application, such as Figure 1 As shown, when the voltage transmitted from the indoor unit is 5V, and when the voltage of the Zener diode DZ2 does not exceed 8V, the positive electrode of the Zener diode DZ2 is connected to the resistor R7, and the other end of the resistor R7 is connected to the resistor R15 and the B pole of the transistor Q6, and the other end of the resistor R15 is grounded. Since the B pole of the transistor Q6 has no electricity, the C pole and the E pole are not conducting, and the E pole is grounded, then under this voltage condition, the transistor Q6 cannot control the transistor Q4; When the voltage transmitted from the indoor unit is 26V, and when the voltage of the voltage-stabilizing diode DZ2 exceeds 8V, the B pole of the transistor Q6 is energized, and the C pole and the E pole are turned on, then the transistor Q6 controls the transistor Q4, so that the transistor Q4 loses the control right over the transistor Q1 during operation; one end of the resistor R6 is connected to INDOOR1, and the other end of the resistor R6 is connected to the B pole of the transistor Q4 and the C pole of the transistor Q6, as well as one end of the capacitor C4. When transistor Q4 is at 5V, the B pole is energized, the C pole and the E pole are turned on, and the E pole is grounded. The other ends of resistors R4 and R5 are connected to the C pole of transistor Q4, and the C pole of transistor Q4 is connected to the C pole of transistor Q5. After transistor Q4 is turned on, the C pole is grounded, and the B pole of transistor Q1 is connected to one end of resistor R5, resulting in a low-impedance voltage formed at the B pole of transistor Q1 to the ground, thereby turning on the C pole and the E pole of transistor Q1. The 5V voltage transmitted by the C pole is connected to the positive pole of diode D5, one end of resistor R2, and the negative pole of diode D5 is connected to the subsequent POW-OUT, and the high-impedance POC circuit unit is connected to the POW-OUT, and the high-impedance POC circuit unit is connected to the voltage conversion unit.

[0017] In other words, when the indoor unit power supply voltage is 5V, the voltage conversion unit circuit connected to the high-impedance POC circuit unit is not working, and the voltage conversion unit circuit cannot provide the AA5V voltage normally, that is, there is no AA5V voltage. The AA5V voltage is used to power the intercom circuit unit and to provide a judgment signal for detecting whether the indoor unit voltage has a 26V voltage. It can also be understood that AA5V is a simulated 5V voltage.

[0018] Among them, Figure 1 As shown, the B pole of transistor Q5 is connected to one end of resistor R10, the C pole is connected to resistor R5, the E pole is grounded, and the other end of resistor R10 is connected to INDOOR1-AV-OF. This signal is connected to the control pin of the microcontroller MCU, and the microcontroller MCU controls this channel; When the whole machine is on standby, the microcontroller MCU does not control, and controls the conduction of the transistor Q1 through the transistor Q4, so that the 5V voltage is normally supplied to the MCU power supply control unit 104, so that the microcontroller MCU has voltage to work normally; when the whole machine is to work, the input voltage reaches 26V, and the microcontroller MCU controls the on and off of the transistor Q5, and opens it when the channel is working, and closes it when the channel is not working.

[0019] Specifically, Figure 1 As shown, in the above standby discharge unit 103, the voltage stabilizing diode DZ4, the resistor R16, the resistor R17, the transistor Q10, the transistor Q11, and the resistor R20 form a standby discharge circuit; When the voltage on the INDOOR1 network is greater than 6V, the voltage-stabilizing diode DZ4 conducts the voltage greater than 6V, the cathode of the voltage-stabilizing diode DZ4 is connected to the resistor R16, the other end of the resistor R16 is connected to the C pole of the transistor Q10, the E pole of the transistor Q10 is grounded, the B pole is connected to the resistor R17 and the C pole of the transistor Q11, the other end of the resistor R17 is connected to the MCUVCC, the B pole of the transistor Q11 is connected to the resistor R20, the E pole of the transistor Q11 is grounded, the other end of the resistor R20 is connected to the INDOOR1-AV-OF network, and the microcontroller MC U is used to control it. It is high level when working and low level when not working. When the whole machine is working, the B pole of transistor Q11 is high level, transistor Q11 is turned on, the B pole of transistor Q10 is low level, transistor Q10 is not turned on, and no discharge occurs. When the INDOOR1-AV-OF network is at a low level, the B pole of transistor Q11 is low level, transistor Q11 is not turned on, the B pole of transistor Q10 is high level, transistor Q10 is turned on, and discharges, and the voltage on the INDOOR1 network immediately drops below 6V and no longer drops, so as to ensure the normal standby 5V power supply.

[0020] Furthermore, if Figure 1As shown, in the above-mentioned MCU power supply control unit 104, the voltage from the transistor Q1 is connected to the resistor R2, the other end of the resistor R2 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to one end of the self-resetting fuse FU1. When the current exceeds a certain value, it is automatically protected and disconnected to achieve the effect of protecting the subsequent stage; the other end of the self-resetting fuse FU1 is connected to the S pole of the transistor Q3, the resistor R8, and one end of the resistor R12. When AA5V has no power, the resistor R13 connected to AA5V and the positive electrode of the transistor Q7 also have no power. The other end of the resistor R13 is connected to the resistor R18 and the B pole of the transistor Q9. The other end of the resistor R18 is connected to the ground. The B pole of the transistor Q9 is not powered, the C pole and the E pole of the transistor Q9 are not conducting, the E pole of the transistor Q9 is grounded, the C pole is connected to the B pole of the transistor Q7 and one end of the resistor R12, and the other end of the resistor R12 is connected to MCUVCC-2, that is, connected to the S pole of the transistor Q3, so that the B pole of the transistor Q7 is a high voltage, and the C pole and the E pole of the transistor Q7 are conducting; the E pole of the transistor Q7 is grounded, and the C pole is connected to the resistor R8, One end of the resistor R11 and the other end of the resistor R11 are connected to the G pole of the transistor Q3 and one end of ESD1, and the other end of ESD1 is grounded. The function of ESD1 is to protect the MOS tube of the transistor Q3; after the C pole and the E pole of the transistor Q7 are turned on, the G pole of the transistor Q3 forms a low impedance through the resistor R11, and the S and D channels of the transistor Q3 are opened and turned on. The 5V voltage is connected to the negative pole of the Zener diode DZ5 through the D pole of the transistor Q3, and the positive pole of the Zener diode DZ5 is grounded. The Zener diode The function of DZ5 is to protect the input voltage to be stable within an acceptable range; the D pole of the transistor Q3 is connected to the capacitor C2, the capacitor C3, the diode D7, and one end of the voltage regulator U1, and the other ends of the capacitors C2 and C3 are grounded. The function of the capacitors C2 and C3 is to filter the voltage. Since the positive electrode of the diode D7 has no electricity, the diode D7 is in a reverse biased state. The voltage regulator U1 stabilizes the voltage of the input pin 2 at 3.3V, the pin 1 of the voltage regulator U1 is grounded, and the output voltage MCUVCC of the pin 3 of the voltage regulator U1 supplies power to the microcontroller MCU; When the indoor unit is powered by 26V and POW-OUT is 26V, the internal voltage conversion unit provides a AA5V voltage. At this time, the positive electrode of the diode D7 has a 5V voltage, which provides a 5V voltage to the voltage regulator U1; the resistor R13 connected to another AA5V provides a voltage to the B pole of the transistor Q9, so that the C pole and the E pole of the transistor Q9 are turned on, and the B pole of the transistor Q7 has no voltage. The transistor Q7 is not turned on, and the G pole of the transistor Q3 is a high voltage, which is equal to the S pole voltage of the transistor Q3, causing the transistor Q3 to be turned off and the voltage cannot pass, that is, the 26V voltage cannot pass, so as to protect the subsequent components from being damaged by high voltage and to provide a stable voltage for the microcontroller MCU at both high and low voltages.

[0021] Furthermore, if Figure 1 As shown, in the above-mentioned call and detection circuit unit 101, the diode D4, the resistor R3, the transistor Q2, and the KEY1 constitute a call circuit, the voltage-stabilizing diode DZ3, the resistor R19, the resistor R14, the transistor Q8, and the resistor R9 constitute an indoor unit power supply detection and control circuit, and the diode D2, the capacitor C1, the voltage-stabilizing diode DZ1, and the resistor R1 constitute a door unit call detection circuit; In standby mode, the voltage transmitted by diode D4 is 5V, and voltage regulator diode DZ3 can pass voltage greater than 6V, that is, 5V voltage cannot pass. The positive pole of voltage regulator diode DZ3 is connected to resistor R14 and resistor R19, and the other end of resistor R19 is grounded. The other end of resistor R14 is connected to the B pole of transistor Q8, and the E pole of transistor Q8 is grounded. The C pole of transistor Q8 is connected to resistor R9, the control IO port of microcontroller MCU, and the B pole of transistor Q2. The other end of resistor R9 is connected to MCUVCC. When there is no power from resistor R14, transistor Q8 is not turned on, and the C pole of transistor Q8 is at a high level. The IO port of microcontroller MCU detects a high level and thinks that it is in standby mode. The C pole and E pole of transistor Q2 are turned on, and the C pole of transistor Q2 is at a high level. Connect one end of resistor R3, and the other end of resistor R3 is connected to the cathode of diode D4. After transistor Q2 is turned on, if the visitor presses KEY1 to call the user, the 5V voltage supplied by the indoor unit will be pulled down. The C pole of transistor Q2 is connected to the anode of diode D2, and the cathode of diode D2 is connected to capacitor C1, voltage-stabilizing diode DZ1, and resistor R1. The other ends of capacitor C1 and voltage-stabilizing diode DZ1 are grounded, and the other end of resistor R1 is connected to MCUVCC. The cathode network of diode D2 is connected to the IO port of microcontroller MCU. The IO port of microcontroller MCU is used to determine whether there is a call. When KEY1 calls the user, the signal voltage of ROOM1-CALL will be pulled down accordingly. At this time, the microcontroller MCU believes that there is a call and makes corresponding control. After the indoor unit detects that the 5V voltage is pulled low, it will start working and supply 26V voltage to the door unit to start working. After the indoor unit supplies 26V voltage, the voltage regulator diode DZ3 detects that it exceeds 6V and will provide voltage to the transistor Q8 to turn on the transistor Q8. At this time, the C pole of the transistor Q8 has no electricity, and the IO port of the microprocessor MCU connected to the INDOOR1-POWER-TEST network is at a low level. The microprocessor MCU thinks it can work. At the same time, the B pole of the transistor Q2 has no electricity. At this time, KEY1 is not allowed to call again to complete the control action of call detection.

[0022] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-household call control detection module for two-line intercom, characterized in that: include: A calling and detection circuit unit, which is used to perform calling, calling detection, and indoor unit power supply operation detection functions after calling; A power supply and control unit, which is used as a high and low voltage control switch for power supply from the indoor unit to meet the switching requirements of each channel when there are multiple households; A standby discharge unit, which is used to quickly discharge the voltage of the channel when it is in standby mode when it is higher than 5V, so as to achieve a voltage lower than 5V when it is in standby mode, and stop discharging when it is lower than 5V; MCU power supply control unit, the MCU power supply control unit is used to supply power to the microcontroller MCU, and control it by switching circuits to prevent the microcontroller MCU from burning out due to excessive voltage; Among them, connector J1 is the port connected to the indoor unit. Two voltages are transmitted from the indoor unit to the door unit, one is the standby voltage of 5V, and the other is the working voltage of 26V. In standby mode, 5V voltage is input from both ends of connector J1, and the voltage polarity is selected by bridge D1, and the positive pole is output to the INDOOR1 network. Specifically, the signal and voltage of the indoor unit are input from the connector J1 and enter the power supply and control unit. The pins 1 and 2 of the connector J1 are connected to the pins 2 and 3 of the bridge D1. After the polarity of the bridge D1 is selected, the positive voltage is output from the pin 1 of the bridge D1 and the pin 4 is grounded. The positive voltage output from the pin 1 of the bridge D1 is connected to the positive electrode of the diode D4, the negative electrodes of the Zener diodes DZ3 and DZ4, the E pole of the transistor Q1, the resistor R4, and one end of the resistor R6. The voltage zener diode DZ2, the resistor R7, the resistor R15, the transistor Q6, the capacitor C4, the resistor R6, the transistor Q4, and the resistor R4 form the control authority for controlling the transistor Q1 in standby and working mode; the transistor Q1 is turned on in standby mode, and the control of the transistor Q1 is turned off in working mode, and the control right is handed over to the microcontroller MCU.

2. The multi-household call control detection module for two-line intercom according to claim 1 is characterized in that: When the voltage transmitted from the indoor unit is 5V, and when the voltage of the Zener diode DZ2 does not exceed 8V, the positive electrode of the Zener diode DZ2 is connected to the resistor R7, and the other end of the resistor R7 is connected to the resistor R15 and the B pole of the transistor Q6. The other end of the resistor R15 is grounded. Since the B pole of the transistor Q6 has no electricity, the C pole and the E pole are not conducting, and the E pole is grounded, then under this voltage condition, the transistor Q6 cannot control the transistor Q4. When the voltage transmitted from the indoor unit is 26V, and when the voltage of the voltage-stabilizing diode DZ2 exceeds 8V, the B pole of the transistor Q6 is energized, and the C pole and the E pole are turned on, then the transistor Q6 controls the transistor Q4, so that the transistor Q4 loses the control right over the transistor Q1 during operation; one end of the resistor R6 is connected to INDOOR1, and the other end of the resistor R6 is connected to the B pole of the transistor Q4 and the C pole of the transistor Q6, as well as one end of the capacitor C4. When transistor Q4 is at 5V, the B pole is energized, the C pole and the E pole are turned on, and the E pole is grounded. The other ends of resistors R4 and R5 are connected to the C pole of transistor Q4, and the C pole of transistor Q4 is connected to the C pole of transistor Q5. After transistor Q4 is turned on, the C pole is grounded, and the B pole of transistor Q1 is connected to one end of resistor R5, resulting in a low-impedance voltage formed at the B pole of transistor Q1 to the ground, thereby turning on the C pole and the E pole of transistor Q1. The 5V voltage transmitted by the C pole is connected to the positive pole of diode D5, one end of resistor R2, and the negative pole of diode D5 is connected to the subsequent POW-OUT, and the high-impedance POC circuit unit is connected to the POW-OUT, and the high-impedance POC circuit unit is connected to the voltage conversion unit.

3. The multi-household call control detection module for two-line intercom according to claim 2 is characterized in that: The B pole of transistor Q5 is connected to one end of resistor R10, the C pole is connected to resistor R5, the E pole is grounded, and the other end of resistor R10 is connected to INDOOR1-AV-OF. This signal is connected to the control pin of the microcontroller MCU, and the microcontroller MCU controls this channel; When the whole machine is on standby, the microcontroller MCU does not control, and controls the conduction of the transistor Q1 through the transistor Q4, so that the 5V voltage is normally supplied to the MCU power supply control unit, so that the microcontroller MCU has voltage to work normally; when the whole machine is to work, the input voltage reaches 26V, and the microcontroller MCU controls the on and off of the transistor Q5, and opens it when the channel is working, and closes it when the channel is not working.

4. The multi-household call control detection module for two-line intercom according to claim 3 is characterized in that: In the standby discharge unit, the voltage stabilizing diode DZ4, the resistor R16, the resistor R17, the transistor Q10, the transistor Q11, and the resistor R20 form a standby discharge circuit; When the voltage on the INDOOR1 network is greater than 6V, the voltage-stabilizing diode DZ4 conducts the voltage greater than 6V, the cathode of the voltage-stabilizing diode DZ4 is connected to the resistor R16, the other end of the resistor R16 is connected to the C pole of the transistor Q10, the E pole of the transistor Q10 is grounded, the B pole is connected to the resistor R17 and the C pole of the transistor Q11, the other end of the resistor R17 is connected to the MCUVCC, the B pole of the transistor Q11 is connected to the resistor R20, the E pole of the transistor Q11 is grounded, the other end of the resistor R20 is connected to the INDOOR1-AV-OF network, and the microcontroller MC U is used to control it. It is high level when working and low level when not working. When the whole machine is working, the B pole of transistor Q11 is high level, transistor Q11 is turned on, the B pole of transistor Q10 is low level, transistor Q10 is not turned on, and no discharge occurs. When the INDOOR1-AV-OF network is at a low level, the B pole of transistor Q11 is low level, transistor Q11 is not turned on, the B pole of transistor Q10 is high level, transistor Q10 is turned on, and discharges, and the voltage on the INDOOR1 network immediately drops below 6V and no longer drops, so as to ensure the normal standby 5V power supply.

5. The multi-household call control detection module for two-line intercom according to claim 4 is characterized in that: In the MCU power supply control unit, the voltage from the transistor Q1 is connected to the resistor R2, the other end of the resistor R2 is connected to the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected to one end of the self-resetting fuse FU1. When the current exceeds a certain value, it automatically protects and disconnects to achieve the effect of protecting the subsequent stage; the other end of the self-resetting fuse FU1 is connected to the S pole of the transistor Q3, the resistor R8, and one end of the resistor R12. When AA5V has no power, the resistor R13 connected to AA5V and the positive electrode of the transistor Q7 also have no power, and the resistor R13 The other end of the resistor R18 is connected to the B pole of the transistor Q9, the other end of the resistor R18 is connected to the ground, the B pole of the transistor Q9 is not powered, the C pole and the E pole of the transistor Q9 are not conducting, the E pole of the transistor Q9 is grounded, the C pole is connected to the B pole of the transistor Q7 and one end of the resistor R12, and the other end of the resistor R12 is connected to MCUVCC-2, that is, connected to the S pole of the transistor Q3, so that the B pole of the transistor Q7 is a high voltage, and the C pole and the E pole of the transistor Q7 are conducting; the E pole of the transistor Q7 is grounded, and the C pole is connected to the resistor R8 and the resistor R 11, the other end of the resistor R11 is connected to the G pole of the transistor Q3 and one end of ESD1, the other end of ESD1 is grounded, and the function of ESD1 is to protect the MOS tube of the transistor Q3; after the C pole and E pole of the transistor Q7 are turned on, the G pole of the transistor Q3 forms a low impedance through the resistor R11, and the S and D channels of the transistor Q3 are opened and turned on, and the 5V voltage is connected to the cathode of the Zener diode DZ5 through the D pole of the transistor Q3, the anode of the Zener diode DZ5 is grounded, and the Zener diode D The function of Z5 is to protect the input voltage to be stable within an acceptable range; the D pole of the transistor Q3 is connected to the capacitor C2, the capacitor C3, the diode D7, and one end of the voltage regulator U1, and the other ends of the capacitors C2 and C3 are grounded. The function of the capacitors C2 and C3 is to filter the voltage. Since the positive electrode of the diode D7 has no electricity, the diode D7 is in a reverse biased state. The voltage regulator U1 stabilizes the voltage of the input pin 2 at 3.3V, the pin 1 of the voltage regulator U1 is grounded, and the output voltage MCUVCC of the pin 3 of the voltage regulator U1 supplies power to the microcontroller MCU; When the indoor unit is powered by 26V and POW-OUT is 26V, the internal voltage conversion unit provides a AA5V voltage. At this time, the positive electrode of the diode D7 has a 5V voltage, which provides a 5V voltage to the voltage regulator U1; the resistor R13 connected to another AA5V provides a voltage to the B pole of the transistor Q9, so that the C pole and the E pole of the transistor Q9 are turned on, and the B pole of the transistor Q7 has no voltage. The transistor Q7 is not turned on, and the G pole of the transistor Q3 is a high voltage, which is equal to the S pole voltage of the transistor Q3, causing the transistor Q3 to be turned off and the voltage cannot pass, that is, the 26V voltage cannot pass, so as to protect the subsequent components from being damaged by high voltage and to provide a stable voltage for the microcontroller MCU at both high and low voltages.

6. The multi-household call control detection module for two-line intercom according to claim 5, characterized in that: In the calling and detecting circuit unit, the diode D4, the resistor R3, the transistor Q2, and the KEY1 constitute a calling circuit, the voltage-stabilizing diode DZ3, the resistor R19, the resistor R14, the transistor Q8, and the resistor R9 constitute an indoor unit power supply detection and control circuit, and the diode D2, the capacitor C1, the voltage-stabilizing diode DZ1, and the resistor R1 constitute a door unit calling detection circuit; In standby mode, the voltage transmitted by diode D4 is 5V, and voltage regulator diode DZ3 can pass voltage greater than 6V, that is, 5V voltage cannot pass. The positive pole of voltage regulator diode DZ3 is connected to resistor R14 and resistor R19, and the other end of resistor R19 is grounded. The other end of resistor R14 is connected to the B pole of transistor Q8, and the E pole of transistor Q8 is grounded. The C pole of transistor Q8 is connected to resistor R9, the control IO port of microcontroller MCU, and the B pole of transistor Q2. The other end of resistor R9 is connected to MCUVCC. When there is no power from resistor R14, transistor Q8 is not turned on, and the C pole of transistor Q8 is at a high level. The IO port of microcontroller MCU detects a high level and thinks that it is in standby mode. The C pole and E pole of transistor Q2 are turned on, and the C pole of transistor Q2 is at a high level. Connect one end of resistor R3, and the other end of resistor R3 is connected to the cathode of diode D4. After transistor Q2 is turned on, if the visitor presses KEY1 to call the user, the 5V voltage supplied by the indoor unit will be pulled down. The C pole of transistor Q2 is connected to the anode of diode D2, and the cathode of diode D2 is connected to capacitor C1, voltage-stabilizing diode DZ1, and resistor R1. The other ends of capacitor C1 and voltage-stabilizing diode DZ1 are grounded, and the other end of resistor R1 is connected to MCUVCC. The cathode network of diode D2 is connected to the IO port of microcontroller MCU. The IO port of microcontroller MCU is used to determine whether there is a call. When KEY1 calls the user, the signal voltage of ROOM1-CALL will be pulled down accordingly. At this time, the microcontroller MCU believes that there is a call and makes corresponding control. After the indoor unit detects that the 5V voltage is pulled low, it will start working and supply 26V voltage to the door unit to start working. After the indoor unit supplies 26V voltage, the voltage regulator diode DZ3 detects that it exceeds 6V and will provide voltage to the transistor Q8 to turn on the transistor Q8. At this time, the C pole of the transistor Q8 has no electricity, and the IO port of the microprocessor MCU connected to the INDOOR1-POWER-TEST network is at a low level. The microprocessor MCU thinks it can work. At the same time, the B pole of the transistor Q2 has no electricity. At this time, KEY1 is not allowed to call again to complete the control action of call detection.

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