External power supply switching control circuit based on POWERBUS
By designing an external power switching control circuit based on the POWERBUS bus, the problems of excessive bus current and insufficient power supply voltage were solved, and the normal operation of the detector was achieved.
Patent Information
- Application Number
- CN202422747949.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-11
AI Technical Summary
In the POWERBUS bus system, when multiple combustible gas detectors are connected to the controller, the bus current is too large, resulting in overcurrent problems. When the controller is far away from the detector, the power supply voltage is insufficient, causing the detector to malfunction.
Abstract: In order to solve the problem of the detector's operation status, a POWERBUS bus-based external power supply switching control circuit was designed. The circuit included an external power supply filter and anti-reverse connection access unit, a bus filter and anti-reverse connection access unit, a power automatic switching control output unit, and a bus communication unit. By automatically switching the external power supply, the bus current and line loss were reduced, ensuring the normal operation of the detector. The results show that the circuit has a good detection accuracy and a good detection accuracy. The detection accuracy is 0.0447 W/m and the detection accuracy is 0.033 W/m. The detection accuracy is 0.0447 W/m and the detection accuracy is 0.037 W/m.
It effectively avoids bus overcurrent problems and uses an external power supply when the detector is far away from the controller, solving the problem of insufficient power supply voltage and ensuring the normal operation of the detector.
Smart Images
Figure CN223363831U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power supply control devices, and in particular relates to an external power supply switching control circuit based on a POWERBUS bus. Background Art
[0002] With the increasing popularity of gas, gas safety is receiving increasing attention. Gas leak alarm control systems based on the POWERBUS communication bus, consisting of multiple combustible gas detectors (referred to as detectors) and combustible gas alarm controllers (referred to as controllers), are becoming increasingly popular. The controller and detectors are connected via the POWERBUS bus. This alarm control system functions by monitoring the concentration of combustible gas in the air in real time through the combustible gas detectors. When the concentration reaches a dangerous level, it automatically triggers an alarm and transmits the gas concentration and alarm information to the combustible gas alarm controller in real time via the POWERBUS bus. The combustible gas alarm controller uses this information to control the fan or valve to reduce the combustible gas concentration in the environment. This shows that the POWERBUS bus between the combustible gas detectors and the combustible gas controller is crucial; it determines whether the alarm can be successfully transmitted.
[0003] In real-world conditions, a single controller needs to connect to numerous detectors, and the detectors' high power consumption can lead to excessive bus current and overcurrent issues. Furthermore, when the controller and detectors are relatively far apart, line losses can lead to insufficient detector power supply voltage, causing them to malfunction. Therefore, a POWERBUS-based external power switching control solution is needed to address these technical issues. Utility Model Content
[0004] The purpose of this utility model is to provide an external power supply switching control circuit based on the POWERBUS bus. When the controller is connected to multiple detectors, the bus current and line loss are reduced by switching the power supply, thereby reducing the impact of the bus signal voltage drop and ensuring that the detectors can work normally.
[0005] The technical solution adopted by the utility model is: an external power supply switching control circuit based on the POWERBUS bus, including an external power supply filter anti-reverse connection access unit, a POWERBUS bus filter anti-reverse connection access unit, a power automatic switching control output unit and a POWERBUS bus communication unit; it also includes a 24V external power supply, the 24V external power supply is connected to the input end of the external power supply filter anti-reverse connection access unit, the output end of the external power supply filter anti-reverse connection access unit is connected to the first input end of the power automatic switching control output unit, the POWERBUS bus is connected to the input end of the POWERBUS bus filter anti-reverse connection access unit, the output end of the POWERBUS bus filter anti-reverse connection access unit is connected to the second input end of the power automatic switching control output unit and is simultaneously connected to the POWERBUS bus communication unit, the output end of the power automatic switching control output unit is connected to the power supply module of the detector mainboard, and the POWERBUS bus communication unit is connected to the communication module of the detector mainboard.
[0006] Preferably, the external power supply filtering and anti-reverse connection access unit includes a self-recovering fuse F1, a TVS tube D1, a common-mode signal suppression choke T1 and a full-bridge U1.
[0007] Preferably, the POWERBUS bus filter anti-reverse connection access unit includes a self-recovering fuse F2, a TVS tube D3, a common-mode signal suppression choke T2, a full bridge U2, a diode D4 and a capacitor E1.
[0008] Preferably, the power automatic switching control output unit includes a transistor V1, a resistor R1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a diode D2 and a MOS tube Q1.
[0009] Preferably, the POWERBUS bus communication unit includes a transistor V2, a communication chip IC1, a resistor R7, a resistor R9, a resistor R10, a resistor R8, a capacitor C1 and a capacitor C2.
[0010] The advantages and positive effects of the utility model are:
[0011] This utility model provides an external power supply switching control circuit based on the POWERBUS bus. When a combustible gas alarm controller is connected to multiple combustible gas detectors, the power supply automatically switches to the external power supply through the control output unit, thereby preventing the problem of excessive bus current, that is, avoiding bus overcurrent. Furthermore, when the distance between the controller and the detectors is relatively long, the aforementioned switching action uses the external power supply for power supply, avoiding the problem of detector malfunction due to insufficient bus power supply voltage.
[0012] In addition, this switching control circuit also has other effects: when there is no external power supply connected, the POWERBUS bus is used for power supply and communication. When the external power supply is connected, the power supply automatic switching control output unit automatically switches the power supply to the external power supply. At this time, the POWERBUS bus only communicates. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural block diagram of the utility model;
[0014] Figure 2 It is a circuit diagram of the present utility model. DETAILED DESCRIPTION
[0015] In order to further understand the content, features and effects of the present invention, the following embodiments are given to illustrate in detail.
[0016] See Figure 1 The present invention's POWERBUS-based external power supply switching control circuit includes an external power supply filter and anti-reverse polarity access unit, a POWERBUS bus filter and anti-reverse polarity access unit, an automatic power supply switching control output unit, and a POWERBUS bus communication unit. The external power supply filter and anti-reverse polarity access unit provides overcurrent protection, overvoltage protection, common-mode interference protection, and reverse polarity protection. The POWERBUS bus filter and anti-reverse polarity access unit provides overcurrent protection, overvoltage protection, common-mode interference protection, and reverse polarity protection. The automatic power supply switching control output unit is used to automatically switch and control the output power supply, and the POWERBUS bus communication unit is used for communication.
[0017] It also includes a 24V external power supply. The 24V external power supply is connected to the input of the external power supply filter and anti-reverse polarity access unit, and the output of the external power supply filter and anti-reverse polarity access unit is connected to the first input of the power automatic switching control output unit. The POWERBUS bus is connected to the input of the POWERBUS bus filter and anti-reverse polarity access unit, and the output of the POWERBUS bus filter and anti-reverse polarity access unit is connected to the second input of the power automatic switching control output unit and is also connected to the POWERBUS bus communication unit. The output of the power automatic switching control output unit is connected to the power supply module of the detector mainboard, and the POWERBUS bus communication unit is connected to the communication module of the detector mainboard.
[0018] like Figure 2 As shown in , in this embodiment, the external power supply filter anti-reverse connection access unit includes a self-recovery fuse F1, a TVS tube D1, a common-mode signal suppression choke T1 and a full-bridge U1. The common-mode signal suppression choke T1 is located between the TVS tube D1 and the full-bridge U1.
[0019] like Figure 2As shown in , in this embodiment, the POWERBUS bus filter anti-reverse connection access unit includes a self-recovery fuse F2, a TVS tube D3, a common-mode signal suppression choke T2, a full bridge U2, a diode D4 and a capacitor E1. The common-mode signal suppression choke T2 is located between the TVS tube D3 and the full bridge U2.
[0020] like Figure 2 As shown in , in this embodiment, the power automatic switching control output unit includes a transistor V1, a resistor R1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a diode D2 and a MOS tube Q1.
[0021] like Figure 2 As shown in , in this embodiment, the POWERBUS bus communication unit includes a transistor V2, a communication chip IC1, a resistor R7, a resistor R9, a resistor R10, a resistor R8, a capacitor C1 and a capacitor C2, and the capacitor C1 and the capacitor C2 are located between the VCC pin of the communication chip IC1 and the ground line.
[0022] Operation description:
[0023] This switching control circuit has two working conditions, one of which is the working condition without external power supply (referring to the working condition that the 24V external power supply is not effectively connected), and the other is the working condition with external power supply (referring to the working condition that the 24V external power supply is effectively connected).
[0024] 1) When there's no external power supply and only the POWERBUS bus is connected to the network at F2, the 24V power from the POWERBUS bus is protected by resettable fuse F2 and TVS diode D3, filtered by common-mode signal suppression choke T2 to eliminate common-mode interference, and then enters full-bridge U2 to prevent reverse power insertion. After filtering by diode D4 and capacitor E1 to remove bus information, the 24V power from the POWERBUS bus is fed to the source of MOSFET Q1 in the power automatic switching control output unit. Because there's no external power supply, there's no voltage across resistor R3, and thus no voltage is divided across the base of transistor V1, turning transistor V1 off. Simultaneously, the series resistor divider formed by resistors R4 and R6 clamps the MOSFET's gate potential to 16V. At this point, the MOSFET's gate-source voltage is -8V, and MOSFET Q1 is on. The 24V power from the POWERBUS bus effectively supplies power to the motherboard's power supply module through MOSFET Q1.
[0025] 2) When an external power supply is present, the 24V external power supply is connected through the resettable fuse F1 in the external power supply filter and reverse polarity protection unit. After passing through the TVS diode for protection, it filters out common-mode interference through the common-mode signal suppression choke T2 before entering the full-bridge U1 to prevent reverse power insertion. It is then connected to the anode of diode D2 in the power automatic switching control output unit. Diode D2 then effectively supplies power to the motherboard's power supply module. Simultaneously, the 24V external power supply is applied to resistor R3, dividing the base of transistor V1 and clamping the base voltage to 22.832V. This turns on transistor V1 and clamps the gate of MOSFET Q1 to 22.159V. At this point, the gate-source voltage of the MOSFET is -1.841V, making MOSFET Q1 non-conducting. Therefore, the 24V power from the POWERBUS bus cannot supply power to the motherboard through MOSFET Q1. Only the 24V external power supply can effectively supply power to the motherboard's power supply module through diode D2.
[0026] The description and application of the present invention are illustrative and are not intended to limit the scope of the present invention to the above-described embodiments. Variations and modifications of the embodiments disclosed herein are possible, and replacements and equivalent components of the embodiments are well known to those skilled in the art. It should be clear to those skilled in the art that the present invention may be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts without departing from the spirit or essential characteristics of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims
1. An external power supply switching control circuit based on POWERBUS bus, characterized by: It includes an external power supply filter and anti-reverse connection access unit, a POWERBUS bus filter and anti-reverse connection access unit, an automatic power supply switching control output unit and a POWERBUS bus communication unit; it also includes a 24V external power supply, the 24V external power supply is connected to the input end of the external power supply filter and anti-reverse connection access unit, the output end of the external power supply filter and anti-reverse connection access unit is connected to the first input end of the automatic power supply switching control output unit, the POWERBUS bus is connected to the input end of the POWERBUS bus filter and anti-reverse connection access unit, the output end of the POWERBUS bus filter and anti-reverse connection access unit is connected to the second input end of the automatic power supply switching control output unit and is also connected to the POWERBUS bus communication unit, the output end of the automatic power supply switching control output unit is connected to the power supply module of the detector mainboard, and the POWERBUS bus communication unit is connected to the communication module of the detector mainboard.
2. The external power supply switching control circuit based on the POWERBUS bus according to claim 1, wherein: The external power supply filter anti-reverse connection access unit includes a self-recovery fuse F1, a TVS tube D1, a common-mode signal suppression choke T1 and a full-bridge U1.
3. The external power supply switching control circuit based on the POWERBUS bus according to claim 2, characterized in that: The POWERBUS bus filter anti-reverse connection access unit includes a self-recovery fuse F2, a TVS tube D3, a common-mode signal suppression choke T2, a full-bridge U2, a diode D4 and a capacitor E1.
4. The external power supply switching control circuit based on the POWERBUS bus according to claim 3, wherein: The power automatic switching control output unit includes a transistor V1, a resistor R1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a diode D2 and a MOS tube Q1.
5. The external power supply switching control circuit based on the POWERBUS bus according to claim 4, characterized in that: The POWERBUS bus communication unit includes a transistor V2, a communication chip IC1, a resistor R7, a resistor R9, a resistor R10, a resistor R8, a capacitor C1 and a capacitor C2.