Automation component

Abstract

The invention relates to an automation component (1), comprising a printed circuit board (LP) with electrical components (B1,…,B4) for performing automation tasks, a first supply voltage terminal (IN_24V) and a second supply voltage terminal (S_GND) configured for connection of a supply voltage (24V), wherein a reverse polarity protection circuit (VSS) is arranged between the first supply voltage terminal (IN_24V) and a feed point (S_1P24V) of the supply voltage (24V) for the components (B1,…,B4), wherein a bridging circuit (US) is integrated into the reverse polarity protection circuit (VSS), and is configured to maintain the energy flow for the electrical components (B1,..,B4) in the event of a voltage dip (SE) in the supply voltage (24V).

Description

[0001] Description

[0002] Automation component

[0003] The invention relates to an automation component comprising a printed circuit board with electrical components for fulfilling automation tasks, a first supply voltage connection and a second supply voltage connection, configured for connecting a supply voltage, wherein a reverse polarity protection circuit is arranged between the first supply voltage connection and a supply voltage feed point for the components.

[0004] DE 102017217003 A1 discloses a multi-strand supply unit for vehicle control units with at least two supply strands, each containing protection diodes for reverse polarity protection and joined together at a common node.

[0005] The CN 118 100400 A discloses a circuit for interrupting the discharge path of a capacitor, consisting of four main circuits: power supply, reverse polarity protection, fast discharge path control and short-time supply for the load.

[0006] KR 20140067207 A discloses an uninterruptible power supply (UPS) with an automatic transfer switch that uses a mechanical emergency transfer switch between the UPS output and the load.

[0007] In current circuits considered state-of-the-art as reverse polarity protection, this protection consists of a PMOS and a Zener diode. While this technology offers protection against reverse polarity, it does not meet the new requirements of IEC 61131-2, which stipulates that power supplies must withstand voltage dips of 1 ms and continue to function without any adverse effects.

[0008] The existing solution has the disadvantage that it lacks mechanisms to bridge such voltage dips. Therefore, the current reverse polarity protection circuit is inadequate, especially in field devices used in automation technology, because it offers no protection against short voltage dips.

[0009] It is an object of the invention to provide an automation component that can withstand voltage dips. For the aforementioned automation component, this object is achieved by integrating a bypass circuit into the reverse polarity protection circuit. This bypass circuit is designed to maintain the energy flow to the electrical components in the event of a voltage dip in the supply voltage. The reverse polarity protection circuit comprises a P-channel MOSFET, and the bypass circuit comprises a PNP transistor. The P-channel MOSFET is arranged between the first supply voltage terminal and the feed point. The PNP transistor is connected to the supply voltage terminal via its base and emitter in such a way that it becomes conductive when the supply voltage fails, thus buffering the energy flow to the automation component and its components via a decoupling capacitor (C2300).

[0010] The SIL04P06Y component, for example, is a P-channel MOSFET. It is a power transistor suitable for use in a reverse polarity protection circuit for DC voltage. The MOSFET allows the current flow in a circuit to be controlled depending on the applied voltage. In conjunction with other components, the P-channel MOSFET can be used to implement a protection circuit that prevents damage from a DC voltage due to incorrect polarity.

[0011] According to the invention, a mains bridging solution is integrated into the reverse polarity protection circuit by adding a PNP transistor. In the event of a mains failure, the PNP transistor becomes conductive, and the energy flow to the assembly is maintained via a buffer capacitor and a decoupling capacitor for the duration of the outage.

[0012] A high-value resistor protects the base of the PNP transistor, and a BAS16 diode ensures reverse polarity protection. These features prevent uncontrolled device shutdowns and significantly increase the efficiency and reliability of the power supply systems.

[0013] The mains bridging provided by the PNP transistor, in combination with the specific capacitor values, not only offers protection against voltage dips but also ensures that the devices meet the new requirements. This innovative combination results in a significant improvement in the reliability and efficiency of the power supply systems and fulfills the new standards requirements, representing a clear advancement over existing solutions.

[0014] The drawing shows an embodiment of the invention, wherein it shows

[0015] FIG 1 shows an automation component with a printed circuit board and FIG 2 shows a reverse polarity protection circuit with an integrated bridging circuit.

[0016] Figure 1 shows an automation component 1 comprising a printed circuit board (PCB) with electrical components B1,...,B4 for fulfilling automation tasks, particularly in industrial process automation. The automation component 1 has a first supply voltage connection IN_24V and a second supply voltage connection S_GND. The supply voltage connections IN_24V and S_GND are configured for connecting a 24V supply voltage and a ground potential.

[0017] A reverse polarity protection circuit VSS is arranged between the first supply voltage connection IN_24V and a feed point S_1P24V, which provides the 24V supply voltage for components B1 , ... ,B4.

[0018] To prevent voltage dips SE in the 24V supply voltage from having a negative impact on the automation component 1, a bridging circuit US is integrated into the reverse polarity protection circuit VSS.

[0019] Figure 2 shows a detailed representation of the reverse polarity protection circuit VSS. The bypass circuit US is integrated within the VSS. The VSS incorporates a P-channel MOSFET in the supply voltage branch between the first supply voltage terminal IN_24V and the feed point S_1P24V. A mains bypass solution is integrated into the VSS by adding a PNP transistor V2301. In the event of a 24V supply voltage failure, the PNP transistor V2301 conducts and can thus maintain energy flow for automation component 1, or its components B1, ..., B4, via a decoupling capacitor C2300 in conjunction with a buffer capacitor C2412 for a period of 1 ms. A Zener diode is connected in series with a resistor R2313 between the 24V supply voltage branch and ground potential.

[0020] In summary, the invention describes a mains bypass circuit that is integrated into the existing reverse polarity protection circuit to withstand voltage dips of 1 ms in accordance with the requirements of the IEC 61131-2 standard. The core of the solution is a PNP transistor V2301, which becomes conductive during a mains failure and maintains the energy flow to the assembly or the 330 pF buffer capacitor C2412 via a 1 F decoupling capacitor C2300 for 1 ms. A BAS16 diode is included to ensure reverse polarity protection, while a high-value resistor R2319 protects the base of the PNP transistor. The RC network with a time constant of 0.022 ms ensures that the circuit reacts quickly enough to meet the requirements.

[0021] T = R * C = 22 / cfl * 1 |1F = 0.022 ms

[0022] This solution prevents uncontrolled shutdowns during voltage dips and ensures the functionality of the power supply, as can be verified by tests according to IEC 61000-4-29. Compared to the previous circuit, which only included a PMOS transistor and a Zener diode, the new solution offers significantly improved reliability and meets the requirements of the IEC 61131-2 standard.

Claims

Patent claims 1. Automation component (1), comprising a printed circuit board (PCB) with electrical components (B1,...,B4) for fulfilling automation tasks, a first supply voltage connection (IN_24V) and a second supply voltage connection (S_GND) designed for connecting a supply voltage (24V), wherein a reverse polarity protection circuit (VSS) is arranged between the first supply voltage connection (IN_24V) and a feed point (S_1P24V) of the supply voltage (24V) for the components (B1,...,B4), characterized by the fact that a bypass circuit (US) is integrated into the reverse polarity protection circuit (VSS) and is designed to maintain the energy flow to the electrical components (B1,...,B4) in the event of a voltage drop (SE) of the supply voltage (24V), wherein the reverse polarity protection circuit (VSS) comprises a P-channel MOSFET, wherein the bypass circuit (US) comprises a PNP transistor (V2301), the P-channel MOSFET is arranged between the first supply voltage terminal (IN_24V) and the injection point (S_1P24V), the PNP transistor (V2301) is connected to the supply voltage terminal (IN_24V) with its base and emitter in such a way that it becomes conductive in the event of a supply voltage failure (24V) and thus maintains an energy flow to the automation component (1) or to its components (B1,...,B4) via a The decoupling capacitor (C2300) provides buffering.

2. Automation component (1) according to claim 1, wherein in the bridging circuit (US) the base of the PNP transistor (V2301) is protected by a high-resistance resistor (R2319) of 390 kOhm.

3. Automation component (1) according to one of claims 1 to 2, wherein the bridging circuit (US) maintains an energy flow into a buffer capacitor (C2412) with 330pF for 1ms via a support capacitor (C2300) with 1 F.

4. Automation component (1) according to one of claims 1 to 3, designed as a field device of automation technology and furthermore designed for short-term bridging of voltage dips in accordance with the requirement of IEC 61131-2.

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