Intelligent detection power supply device for BA gateway

Abstract

The utility model discloses an intelligent detection power supply device used for a BA gateway, comprising a power supply module, a single-chip microcomputer, an anti-reverse connection MOS tube and a detection protection circuit, the power supply module comprises two power supply interfaces, the positive electrode ends of the two power supply interfaces are respectively connected with the corresponding input ends of the single-chip microcomputer, and the negative electrode ends of the two power supply interfaces are respectively connected with the detection protection circuit. The positive electrode ends of the two power interfaces are respectively connected with the source electrode of an anti-reverse-connection MOS tube, the grid electrodes of the two anti-reverse-connection MOS tubes are respectively connected with the two corresponding output ends of the single-chip microcomputer, and the drain electrodes of the two anti-reverse-connection MOS tubes are connected together; the detection protection circuit comprises a chip LM5069, an overvoltage locking end, an undervoltage locking end, a positive power supply input end and a current detection input end of the chip LM5069 are all connected with corresponding output ends of the single chip microcomputer, a grid driving output end of the chip LM5069 is connected with a grid of the protection MOS tube and used for controlling a switch of the protection MOS tube, and a source of the protection MOS tube is connected with drains of the two anti-reverse-connection MOS tubes. Wherein the two power interfaces are adopted to realize power isolation, and the detection protection circuit can effectively ensure the safety of the whole circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of BA gateways, in particular to an intelligent detection power supply device for a BA gateway. Background Art

[0002] The building automation control system is abbreviated as the Building Automation System (BA system). The BA system is a distributed control system designed based on modern distributed control theory. The system controllers distributed at each monitoring site are connected through a network system to jointly complete an integrated automation system for centralized operation management and decentralized control. The BA system mainly includes an air conditioning system, a water supply and drainage system, a power supply and distribution system, a lighting system, an elevator system, a cold and heat source monitoring system, a supply and exhaust air monitoring system, and a fan coil monitoring system. The BA gateway is an important part of the entire BA system, and the power supply of the BA gateway is related to whether the entire BA system can operate normally.

[0003] In the prior art, the power supply of the BA gateway simply uses diodes to combine two power supplies, and the power redundancy inputs are not isolated from each other. When one of the power supplies is reversely connected or short-circuited, it will directly affect the other power supply, with high power consumption and serious heating, and high requirements for the heat dissipation device. When overvoltage, undervoltage, overcurrent, short-circuit, and reverse connection of the power supply line occur in the power supply input, the entire circuit cannot be protected. Content of the Utility Model

[0004] The main problem to be solved by the utility model is to provide an intelligent detection power supply device for a BA gateway, which solves the problems that in the existing BA gateway, the power redundancy inputs are not isolated from each other, when one of them is reversely connected or short-circuited, it will directly affect the other power supply, and the intelligent detection of overvoltage, undervoltage, overcurrent, short-circuit, and reverse connection of the power supply line in the circuit cannot be carried out.

[0005] To solve the above technical problems, a technical solution adopted by the utility model is to provide an intelligent detection power supply device for a BA gateway, including a power supply module, a single-chip microcomputer, an anti-reverse connection MOS tube, and a detection and protection circuit. The power supply module includes two power supply interfaces, the positive terminals of the two power supply interfaces are respectively connected to the corresponding input terminals of the single-chip microcomputer, the positive terminals of the two power supply interfaces are also respectively connected to the source electrodes of an anti-reverse connection MOS tube, the gate electrodes of the two anti-reverse connection MOS tubes are respectively connected to the corresponding two output terminals of the single-chip microcomputer, and the drain electrodes of the two anti-reverse connection MOS tubes are connected together;

[0006] The detection and protection circuit includes the chip LM5069. The overvoltage lockout terminal, undervoltage lockout terminal, positive power input terminal, and current detection input terminal of the chip LM5069 are all electrically connected to the corresponding output terminals of the single-chip microcomputer. The gate drive output terminal of the chip LM5069 is connected to the gate of the protection MOS transistor for controlling the on-off of the protection MOS transistor. The source electrode of the protection MOS transistor is connected to the drain electrodes of the two reverse connection prevention MOS transistors.

[0007] In some embodiments, the power supply module includes two power supply circuits;

[0008] In the first power supply circuit, the positive terminal of the first external power supply is connected to the first resettable fuse and then to the first power supply providing terminal. The first power supply providing terminal is connected to the first capacitor and then grounded. Among them, the first power supply providing terminal provides the first DC power supply corresponding to the first power supply interface;

[0009] In the second power supply circuit, the positive terminal of the second external power supply is connected to the second resettable fuse and then to the second power supply providing terminal. The second power supply providing terminal is connected to the second capacitor and then grounded. Among them, the second power supply providing terminal provides the second DC power supply corresponding to the second power supply interface.

[0010] In some embodiments, the single-chip microcomputer uses the chip JW7201. The first power input terminal and the second power input terminal of the chip JW7201 are respectively connected to the first DC power supply and the second DC power supply. The first gate control drive terminal and the second gate control drive terminal of the chip JW7201 are respectively connected to the gates of the two reverse connection prevention MOS transistors.

[0011] In some embodiments, the intelligent detection power supply device further includes a filtering circuit. The input terminal of the filtering circuit is connected to the drain electrodes of the two reverse connection prevention MOS transistors, and the output terminal is connected to the detection and protection circuit.

[0012] In some embodiments, the input terminal of the filtering circuit is connected to the third capacitor and then grounded. The input terminal of the filtering circuit is also connected to the first end of the first inductor. The second end of the first inductor is connected to the fourth capacitor and then grounded; both ends of the fourth capacitor are also respectively connected to the first end and the fourth end of the common mode inductor. The second end of the common mode inductor is connected to the output terminal of the filtering circuit. The third end of the common mode inductor is grounded, and a Schottky diode, a fifth capacitor, and a sixth capacitor in parallel are connected between the second end and the third end of the common mode inductor.

[0013] In some embodiments, the intelligent detection power supply device further includes a power indication module. The power indication module includes a power indicator light. The power indicator light is provided with a first light-emitting diode and a second light-emitting diode. The first level output terminal of the chip JW7201 is connected to the positive electrode of the first light-emitting diode, and the second level output terminal of the chip JW7201 is connected to the positive electrode of the second light-emitting diode. The negative electrodes of the first light-emitting diode and the second light-emitting diode are both grounded.

[0014] In some embodiments, the source electrode of the protection MOS transistor is connected to the output feedback terminal and the power indication terminal of the chip LM5069. After the output terminal of the filter circuit is connected to the current sensing resistor, it is connected to the drain electrode of the protection MOS transistor.

[0015] In some embodiments, the overvoltage lockout terminal, undervoltage lockout terminal, positive power input terminal, and current detection input terminal of the chip LM5069 are all electrically connected to the output terminal of the filter circuit;

[0016] The output terminal of the filter circuit is connected to a first resistor and a second resistor and then grounded. The overvoltage lockout terminal of the chip LM5069 is connected to the connection point between the first resistor and the second resistor for detecting the voltage at this point;

[0017] The output terminal of the filter circuit is also connected to a third resistor and a fourth resistor and then grounded. The undervoltage lockout terminal of the chip LM5069 is connected to the connection point between the third resistor and the fourth resistor for detecting the voltage at this point;

[0018] The output terminal of the filter circuit is connected to the positive power input terminal of the chip LM5069. After the output terminal of the filter circuit is connected to the current sensing resistor, it is connected to the current detection input terminal of the chip LM5069 for detecting the current passing through the current sensing resistor.

[0019] The beneficial effects of the present utility model are as follows: The present utility model discloses an intelligent detection power supply device for a BA gateway, which includes a power supply module, a single-chip microcomputer, an anti-reverse connection MOS transistor, and a detection and protection circuit. The power supply module includes two power supply interfaces. The positive terminals of the two power supply interfaces are respectively connected to the corresponding input terminals of the single-chip microcomputer. The positive terminals of the two power supply interfaces are also respectively connected to the source electrodes of an anti-reverse connection MOS transistor. The gate electrodes of the two anti-reverse connection MOS transistors are respectively connected to the corresponding two output terminals of the single-chip microcomputer, and the drain electrodes of the two anti-reverse connection MOS transistors are connected together; the detection and protection circuit includes a chip LM5069. The overvoltage lock terminal, undervoltage lock terminal, positive power supply input terminal, and current detection input terminal of the chip LM5069 are all electrically connected to the corresponding output terminals of the single-chip microcomputer. The gate drive output terminal of the chip LM5069 is connected to the gate electrode of the protection MOS transistor for controlling the on / off of the protection MOS transistor. The source electrode of the protection MOS transistor is connected to the drain electrodes of the two anti-reverse connection MOS transistors. The present utility model uses two power supply interfaces to achieve power isolation. At the same time, by using the detection and protection circuit, the safety of the entire circuit can be effectively guaranteed, the reliability of the BA gateway product can be increased, and the hardware cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic diagram of the connection principle of each part of an intelligent detection power supply device for a BA gateway according to the present utility model;

[0021] Figure 2 FIG. is a schematic diagram of the two power supply circuits of an intelligent detection power supply device for a BA gateway according to the present utility model;

[0022] Figure 3 FIG. is a schematic diagram of the single-chip microcomputer in an intelligent detection power supply device for a BA gateway according to the present utility model;

[0023] Figure 4 FIG. is a schematic diagram of the filter circuit in an intelligent detection power supply device for a BA gateway according to the present utility model;

[0024] Figure 5 FIG. is a schematic diagram of the detection and protection circuit in an intelligent detection power supply device for a BA gateway according to the present utility model;

[0025] Figure 6 FIG. is a schematic diagram of the circuit of the power indication module in an intelligent detection power supply device for a BA gateway according to the present utility model; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To facilitate the understanding of the present utility model, the present utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive.

[0027] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0028] As Figure 1 shown, the connection relationship between the various component modules of an intelligent detection power supply device for a BA gateway according to the present utility model is shown. The intelligent detection power supply device includes a power supply module 1, a single-chip microcomputer 2, an anti-reverse connection MOS transistor 3, and a detection and protection circuit 4. The power supply module 1 includes two power supply interfaces. The positive terminals of the two power supply interfaces are respectively connected to the corresponding input terminals of the single-chip microcomputer 2. The positive terminals of the two power supply interfaces are also respectively connected to the source electrodes of an anti-reverse connection MOS transistor 3. The gate electrodes of the two anti-reverse connection MOS transistors 3 are respectively connected to the corresponding two output terminals of the single-chip microcomputer 2. The drain electrodes of the two anti-reverse connection MOS transistors 3 are connected together. The single-chip microcomputer 2 is also connected to a power supply indication module 5 for indicating the working state of the power supply module 1.

[0029] In this embodiment, the single-chip microcomputer 2 controls the conduction of one of the anti-reverse connection MOS transistors 3, and the other anti-reverse connection MOS transistor 3 can prevent a DC power supply obtained through the single-chip microcomputer 2 from flowing back to the other power supply interface, so as to realize the detection and protection of the detection and protection circuit 4 during the working state of the entire intelligent detection power supply device. By controlling the conduction voltage of the two anti-reverse connection MOS transistors 3 by the single-chip microcomputer 2, the DC power supply redundancy can be intelligently realized. At the same time, the anti-reverse connection MOS transistor 3 provides an anti-reverse connection function. When the external power supply line is connected reversely, both of the two anti-reverse connection MOS transistors 3 do not conduct, preventing the power from flowing back to the other power supply after being input from one power supply.

[0030] Specifically, the anti-reverse connection MOS transistor 3 uses an N-channel MOS transistor, with a conduction internal resistance of 10 milliohms and very little heat generation, having obvious advantages in heat dissipation and power consumption.

[0031] As Figure 2As shown in the figure, the power supply module 1 includes two power supply circuits. In the first power supply circuit, the positive terminal of the first external power supply VIN12-1 is connected to the first resettable fuse F1 and then to the first power supply providing terminal. The first power supply providing terminal is connected to the first capacitor C1 and then grounded. Among them, the first power supply providing terminal provides the first DC power supply VIN12-1A, corresponding to the first power supply interface. In the second power supply circuit, the positive terminal of the second external power supply VIN12-2 is connected to the second resettable fuse F2 and then to the second power supply providing terminal. The second power supply providing terminal is connected to the second capacitor C2 and then grounded. Among them, the second power supply providing terminal provides the second DC power supply VIN12-2A, corresponding to the second power supply interface.

[0032] In this embodiment, the resettable fuses F1 and F2 can protect the circuit from overload and short circuit damage. When a circuit fault occurs, the resettable fuses F1 and F2 can quickly disconnect the power supply.

[0033] As Figure 3 shown in the figure, the single-chip microcomputer uses the chip JW7201. The first DC power supply VIN12-1A and the second DC power supply VIN12-2A are respectively connected to the first power supply input terminal IN1 and the second power supply input terminal IN2 of the chip JW7201.

[0034] The JW7201 two-in-one chip of the domestic chip JWETECH is a positive bus ideal OR controller. The chip JW7201 can parallel multiple power supplies together for power supply, acting as backups for each other to improve power supply reliability. By controlling the conduction voltage of the MOS tube, the chip JW7201 can achieve no current oscillation when switching from one channel to another. If a power supply failure or short circuit occurs, the chip JW7201 will quickly turn off the MOS tube to minimize the transient negative current. Further, the two reverse connection prevention MOS tubes 3 are respectively Figure 3 the first MOS tube Q1 and the second MOS tube Q2 in the figure. The first gate control drive terminal GATE1 of the chip JW7201 is connected to the gate of the first MOS tube Q1, and the second gate control drive terminal GATE2 is connected to the gate of the second MOS tube Q2. The power supply output terminal OUT of the chip JW7201 is connected to the drains of the first MOS tube Q1 and the second MOS tube Q2 to control the output of a power supply voltage VIN-12.

[0035] Further, the first DC power supply VIN12-1A is connected to the first voltage dividing resistor R1 and then connected to the first voltage monitoring terminal MON1 of the chip JW7201. The second DC power supply VIN12-2A is connected to the second voltage dividing resistor R3 and then connected to the second voltage monitoring terminal MON2 of the chip JW7201. By voltage dividing to monitor the input power supply voltages of the first voltage monitoring terminal MON1 and the second voltage monitoring terminal MON2, the disconnection of one of the DC power supplies can be realized.

[0036] When the first voltage monitoring terminal MON1 detects that the voltage is lower than 1.23V, the first level output terminal PWRFLT1# will output a low level, corresponding to the disconnection of each isolated ground from the power ground, achieving the disconnection of the connection to the first DC power supply VIN12-1A. At this time, the chip JW7201 switches to use the second DC power supply VIN12-2A to control the entire intelligent detection power supply device. Similarly, when the second voltage monitoring terminal MON2 detects that the voltage is lower than 1.23V, the second level output terminal PWRFLT2# will output a low level, corresponding to the disconnection of each isolated ground from the power ground, achieving the disconnection of the connection to the second DC power supply VIN12-2A. At this time, the chip JW7201 switches to use the first DC power supply VIN12-1A to control the entire intelligent detection power supply device.

[0037] In this embodiment, the chip JW7201 can limit the peak fault current at a turn-off time of 0.3 μs and has a wide operating voltage range: 6V to 80V; at the same time, through the cooperation of two reverse-blocking MOS transistors 3, there is no reverse DC current, which can ensure the safety of the circuit during use.

[0038] Combined Figure 3 and Figure 4 As shown, it further includes a filter circuit. The drain of the first MOS transistor Q1 and the drain of the second MOS transistor Q2 are connected to the input end of the filter circuit. The output end of the filter circuit is connected to the detection and protection circuit 4. A path of power supply voltage VIN-12 controlled by the chip JW7201 is input from the input end of the filter circuit.

[0039] Specifically, the input end of the filter circuit is grounded after being connected to the third capacitor C3. At the same time, the input end of the filter circuit is also connected to the first end of the first inductor L1. The second end of the first inductor L1 is grounded after being connected to the fourth capacitor C4; both ends of the fourth capacitor C4 are respectively connected to the first end and the fourth end of the common-mode inductor L2. The second end of the common-mode inductor L2 is connected to the output end of the filter circuit. The third end of the common-mode inductor L2 is grounded, and a parallel-connected Schottky diode D11, fifth capacitor C5, and sixth capacitor C6 are connected between the second end and the third end of the common-mode inductor L2. The cathode of the Schottky diode D11, the first end of the fifth capacitor C5, and the first end of the sixth capacitor C6 are connected to the output end of the filter circuit. The anode of the Schottky diode D11, the second end of the fifth capacitor C4, and the second end of the sixth capacitor C6 are grounded.

[0040] In this embodiment, a common-mode inductor L2 is connected in series in the filter circuit. When a common-mode interference current flows through the common-mode inductor L2, due to the co-directionality of the common-mode interference current, a co-directional magnetic field will be generated inside the common-mode inductor L2, increasing the inductive reactance of the common-mode inductor L2, making the common-mode inductor L2 exhibit high impedance, generating a strong damping effect, thereby attenuating the common-mode interference current to achieve the purpose of filtering. When the normal differential-mode current in the circuit flows through the common-mode inductor L2, the currents generate opposite magnetic fields in the common-mode inductor coil L2 wound in the same phase and cancel each other out, so there is basically no attenuation effect on the normal differential-mode current. At the same time, the filter circuit can reduce the AC component in the pulsating DC voltage, retain its DC component, reduce the ripple coefficient of the output voltage, and make the overall waveform smoother.

[0041] The chip LM5069 is a positive-voltage hot-swap controller, which can provide intelligent control for power connections during the insertion and removal of a circuit board from a live system backplane or other hot-swap power supplies. The chip LM5069 has a wide operating range: current limiting from 9V to 80V, which can be used for safely inserting a board into a field power supply. The chip LM5069 can provide inrush current control to limit system voltage drops and transients. The current limiting and power dissipation in the external serial-conducting N-channel MOSFET can be programmed to ensure its operation within the safe operating area (SOA). The input undervoltage and overvoltage lockout levels and hysteresis, as well as the initial insertion delay time and fault monitoring time, can all be programmed. After fault monitoring, LM5069-1 locks up, while LM5069-2 automatically restarts with a fixed duty cycle.

[0042] As Figure 5 shown, the detection and protection circuit 4 includes the chip LM5069. The overvoltage lockout terminal OVLO, undervoltage lockout terminal UVLO, positive power input terminal VIN, and current detection input terminal SEN of the chip LM5069 are all electrically connected to the output terminal of the filter circuit. The gate drive output terminal GATE of the chip LM5069 is connected to the gate of the protection MOSFET Q5 to control the switching of the protection MOSFET Q5. The output feedback terminal OUT and power good indicator terminal PGD of the chip LM5069 are connected to the source of the protection MOSFET Q5.

[0043] Specifically, the output terminal of the filter circuit outputs a filtered voltage VIN-12-1. The output terminal of the filter circuit is connected to the first resistor R15 and the second resistor R18 and then grounded. The overvoltage lockout terminal OVLO is connected to the connection point between the first resistor R15 and the second resistor R18 to detect the voltage at this point. When the overvoltage lockout terminal OVLO detects overvoltage, it controls the gate drive output terminal GATE to output a gate voltage to the gate of the protection MOSFET Q5, controlling the protection MOSFET Q5 to turn off, thereby powering off to protect the entire circuit.

[0044] Further, the output terminal of the filter circuit is also connected to a third resistor R16 and a fourth resistor R19 and then grounded. The undervoltage lockout terminal UVLO is connected to the connection point between the third resistor R16 and the fourth resistor R19, and is used to detect the voltage at this point. When the undervoltage lockout terminal UVLO detects undervoltage, it controls the gate drive output terminal GATE to output a gate voltage to the gate of the protection MOS transistor Q5, controlling the protection MOS transistor Q5 to turn off, thereby powering off to protect the entire circuit.

[0045] Further, the output terminal of the filter circuit is also respectively connected to the positive power input terminal VIN and the current detection input terminal SEN. Among them, the output terminal of the filter circuit is directly connected to the positive power input terminal VIN. The output terminal of the filter circuit is connected to a current sensing resistor R14 and then respectively connected to the current detection input terminal SEN and the drain of the protection MOS transistor Q5. When the positive power input terminal VIN and the current detection input terminal SEN detect that the current passing through the current sensing resistor R14 is an overcurrent, it controls the gate drive output terminal GATE to output a gate voltage to the gate of the protection MOS transistor Q5, controlling the protection MOS transistor Q5 to turn off, thereby powering off to protect the entire circuit.

[0046] Moreover, when the protection MOS transistor Q5 is turned off, the output feedback terminal OUT obtains the DS voltage of the protection MOS transistor Q5 (i.e., the drain-source voltage, which is the voltage difference between the drain and the source of the MOS transistor when it is working). At this time, the DS voltage of the protection MOS transistor Q5 increases to more than 2.5V, and the output feedback terminal OUT controls the power supply indication terminal PGD to be in an inhibited state.

[0047] Further, when the undervoltage lockout terminal UVLO, overvoltage lockout terminal OVLO, positive power input terminal VIN, and current detection input terminal SEN of the chip LM5069 do not detect overvoltage, undervoltage, and overcurrent, the gate drive output terminal GATE outputs a conduction voltage to the gate of the protection MOS transistor Q5, controlling the protection MOS transistor Q5 to conduct. The output feedback terminal OUT obtains the DS voltage of the protection MOS transistor Q5. At this time, the DS voltage of the protection MOS transistor Q5 decreases to less than 1.25V, and it controls the power supply indication terminal PGD to be in an active state.

[0048] Further, the connected first resistor R15 and second resistor R18 are in parallel with the connected third resistor R16 and fourth resistor R19 between the output terminal and the ground terminal of the filter circuit. After the grounded end is connected to the external resistor R20, it is connected to the power setting terminal PWR of the chip LM5069. Combined with the current sensing resistor R14, the maximum power consumption allowed to pass through the protection MOS transistor Q5 can be set. The grounded end is also connected to the first end of the external capacitor C11. The timing capacitor terminal TIMER of the chip LM5069 is connected to the second end of the external capacitor C11, which can set the insertion time delay and the fault timeout time. The external capacitor C11 can also set the restart time after the chip LM5069 switches the DC power supply.

[0049] In this embodiment, the undervoltage lockout terminal UVLO, overvoltage lockout terminal OVLO, positive power input terminal VIN, and current detection input terminal SEN of the chip LM5069 respectively detect overvoltage, undervoltage, and overcurrent, so as to control the gate drive output terminal GATE to output a gate voltage to the gate of the protection MOS transistor Q5, and further control the protection MOS transistor Q5 to turn off, thereby powering off to protect the entire circuit.

[0050] In the normal working state, the first DC power supply VIN12-1A and the second DC power supply VIN12-2A obtained through the power supply module 1 are input into the chip JW7201 and then output a power supply voltage VIN-12. After passing through the filter circuit, the filtered voltage VIN-12-1 is output. The filtered voltage VIN-12-1 then passes through the detection and protection circuit 5 and outputs a gateway voltage VIN-12V from the source electrode of the protection MOS transistor Q5 to supply power to the BA gateway.

[0051] As Figure 1 shown, the intelligent detection power supply device further includes a power indication module 5, which is electrically connected to the output terminal corresponding to the single-chip microcomputer 2.

[0052] Combined Figure 3 and Figure 6 , the power indication module 5 includes a power indicator LED2green. The power indicator LED2green is provided with a first light-emitting diode and a second light-emitting diode, which are respectively used to indicate the usage status of the first DC power supply VIN12-1A and the second DC power supply VIN12-2A. The first level output terminal PWRFLT1# of the chip JW7201 is connected to the positive electrode of the first light-emitting diode through DC1, and the second level output terminal PWRFLT2# of the chip JW7201 is connected to the positive electrode of the second light-emitting diode through DC2. The negative electrodes of the first light-emitting diode and the second light-emitting diode are both grounded.

[0053] When the first level output terminal PWRFLT1# of the chip JW7201 outputs a high level, the first light-emitting diode lights up. When the second level output terminal PWRFLT2# of the chip JW7201 outputs a low level, the second light-emitting diode does not light up, indicating that the first DC power supply VIN12-1A is used at this time.

[0054] In this embodiment, through the voltage detection function of the chip JW7201, when a voltage within the range is detected to be input, the corresponding light-emitting diode in the power indicator is directly controlled to light up. In this way, it has nothing to do with whether the main control system is up or not, and it belongs to an intelligent hardware control indicator.

[0055] It can be seen that the present utility model discloses an intelligent detection power supply device for a BA gateway, which includes a power supply module, a single-chip microcomputer, an anti-reverse connection MOS tube and a detection protection circuit. The power supply module includes two power supply interfaces. The positive terminals of the two power supply interfaces are respectively connected to the corresponding input terminals of the single-chip microcomputer. The positive terminals of the two power supply interfaces are also respectively connected to the source electrodes of an anti-reverse connection MOS tube. The gate electrodes of the two anti-reverse connection MOS tubes are respectively connected to the corresponding two output terminals of the single-chip microcomputer. The drain electrodes of the two anti-reverse connection MOS tubes are connected together; the detection protection circuit includes a chip LM5069. The overvoltage lock terminal, undervoltage lock terminal, positive power input terminal and current detection input terminal of the chip LM5069 are all electrically connected to the corresponding output terminals of the single-chip microcomputer. The gate drive output terminal of the chip LM5069 is connected to the gate electrode of the protection MOS tube to control the on-off of the protection MOS tube. The source electrode of the protection MOS tube is connected to the drain electrodes of the two anti-reverse connection MOS tubes. The present utility model uses two power supply interfaces to achieve power isolation. At the same time, by using the detection protection circuit, the safety of the entire circuit can be effectively guaranteed, the reliability of the BA gateway product can be increased, and the hardware cost can be reduced.

[0056] The above are only embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. An intelligent detection power supply device for a BA gateway, characterized in that, It includes a power supply module, a single-chip microcomputer, an anti-reverse connection MOS transistor, and a detection and protection circuit. The power supply module includes two power supply interfaces. The positive terminals of the two power supply interfaces are respectively connected to the corresponding input terminals of the single-chip microcomputer. The positive terminals of the two power supply interfaces are also respectively connected to the source electrodes of one of the anti-reverse connection MOS transistors. The gate electrodes of the two anti-reverse connection MOS transistors are respectively connected to the corresponding two output terminals of the single-chip microcomputer. The drain electrodes of the two anti-reverse connection MOS transistors are connected together. The detection and protection circuit includes a chip LM5069. The overvoltage lockout terminal, undervoltage lockout terminal, positive power supply input terminal, and current detection input terminal of the chip LM5069 are all electrically connected to the corresponding output terminal of the single-chip microcomputer. The gate drive output terminal of the chip LM5069 is connected to the gate electrode of the protection MOS transistor for controlling the on-off of the protection MOS transistor. The source electrode of the protection MOS transistor is connected to the drain electrodes of the two anti-reverse connection MOS transistors.

2. The intelligent detection power supply device according to claim 1, wherein The power supply module includes two power supply circuits. In the first power supply circuit, the positive terminal of the first external power supply is connected to a first resettable fuse and then connected to a first power supply providing terminal. The first power supply providing terminal is connected to a first capacitor and then grounded. Among them, the first power supply providing terminal provides a first DC power supply corresponding to the first power supply interface. In the second power supply circuit, the positive terminal of the second external power supply is connected to a second resettable fuse and then connected to a second power supply providing terminal. The second power supply providing terminal is connected to a second capacitor and then grounded. Among them, the second power supply providing terminal provides a second DC power supply corresponding to the second power supply interface.

3. The intelligent detection power supply device according to claim 2, wherein The single-chip microcomputer uses a chip JW7201. The first power supply input terminal and the second power supply input terminal of the chip JW7201 are respectively connected to the first DC power supply and the second DC power supply. The first gate control drive terminal and the second gate control drive terminal of the chip JW7201 are respectively connected to the gate electrodes of the two anti-reverse connection MOS transistors.

4. The intelligent detection power supply device according to claim 3, characterized in that, The intelligent detection power supply device further includes a filtering circuit. The input terminal of the filtering circuit is connected to the drain electrodes of the two anti-reverse connection MOS transistors. The output terminal of the filtering circuit is connected to the detection and protection circuit.

5. The intelligent detection power supply device according to claim 4, characterized in that, The input terminal of the filtering circuit is connected to a third capacitor and then grounded. The input terminal of the filtering circuit is also connected to the first end of a first inductor. The second end of the first inductor is connected to a fourth capacitor and then grounded. The two ends of the fourth capacitor are also respectively connected to the first end and the fourth end of a common mode inductor. The second end of the common mode inductor is connected to the output terminal of the filtering circuit. The third end of the common mode inductor is grounded. And a Schottky diode, a fifth capacitor, and a sixth capacitor in parallel are connected between the second end and the third end of the common mode inductor.

6. The intelligent detection power supply device according to claim 3, wherein The intelligent detection power supply device further includes a power indication module. The power indication module includes a power indicator light, and the power indicator light is provided with a first light-emitting diode and a second light-emitting diode. The first level output terminal of the chip JW7201 is connected to the positive electrode of the first light-emitting diode, the second level output terminal of the chip JW7201 is connected to the positive electrode of the second light-emitting diode, and the negative electrodes of the first light-emitting diode and the second light-emitting diode are both grounded.

7. The intelligent detection power supply device according to claim 5, characterized in that, The source electrode of the protection MOS transistor is connected to the output feedback terminal and the power indication terminal of the chip LM5069. After the output terminal of the filter circuit is connected to the current sensing resistor, it is connected to the drain electrode of the protection MOS transistor.

8. The intelligent detection power supply device according to claim 7, wherein The overvoltage lock terminal, undervoltage lock terminal, positive power input terminal and current detection input terminal of the chip LM5069 are all electrically connected to the output terminal of the filter circuit; The output terminal of the filter circuit is connected to a first resistor and a second resistor and then grounded, and the overvoltage lock terminal of the chip LM5069 is connected to the connection point between the first resistor and the second resistor; The output terminal of the filter circuit is also connected to a third resistor and a fourth resistor and then grounded, and the undervoltage lock terminal of the chip LM5069 is connected to the connection point between the third resistor and the fourth resistor; The output terminal of the filter circuit is connected to the positive power input terminal of the chip LM5069. After the output terminal of the filter circuit is connected to the current sensing resistor, it is connected to the current detection input terminal of the chip LM5069 for detecting the current passing through the current sensing resistor.

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