Redundant power supply switching filter

Abstract

The utility model relates to the technical field of power supply filters, in particular to a redundant power supply switching filter, which comprises a direct-current relay, an EMI (Electro-Magnetic Interference) filter circuit, a singlechip, a control circuit, a detection circuit, a voltage conversion circuit, a first power supply circuit and a second power supply circuit, the output end of the single-chip microcomputer is connected with the AC output port through the EMI filter circuit, the single-chip microcomputer is connected with the DC relay through the control circuit, the single-chip microcomputer is connected with the AC input port A through the detection circuit, and the single-chip microcomputer is respectively connected with the output end of the first power supply circuit and the output end of the second power supply circuit through the voltage conversion circuit. The input end of the first power supply circuit is connected to an alternating current input port A, and the input end of the second power supply circuit is connected to an alternating current input port B; according to the utility model, seamless switching can be basically realized, and stable work of rear-end load equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply filters, in particular to a redundant power supply switching filter. Background Art

[0002] Traditional power supply filters are typically passive networks composed of capacitors, inductors, and resistors, primarily designed to enhance EMI filtering between the AC input and downstream loads. Existing power supply filters build upon these traditional filters by adding a switchable function, namely, redundancy at the AC input. This involves providing two AC power inputs on the AC input side: a primary AC input and a secondary AC input. The primary and secondary AC inputs are isolated from each other. When the primary AC input is present, it connects to the downstream load. When the primary AC input is absent, the secondary AC input switches to the downstream load, ensuring stable operation of the downstream load equipment.

[0003] At present, the redundancy function is mainly realized by switching by connecting the AC relay K1 at the AC input end (such as Figure 1 The AC relay comes with two sets of transfer switches, which facilitate physical switching: when AC is connected to the main AC line, the AC relay's transfer switch is closed, and the main AC line supplies power to the downstream load through the filter circuit; when AC is disconnected from the main AC line, the AC relay's transfer switch automatically switches to the auxiliary AC line for power supply, thus achieving redundant input. Although AC relays are easy to use, they have a long switching time. When the main AC line loses power, the AC relay will not switch immediately. There is a time interval of approximately 30mS for the coil to discharge. This can easily cause the downstream load equipment to malfunction due to the prolonged power outage, affecting the stable operation of the downstream load equipment. Utility Model Content

[0004] The technical problem to be solved by the utility model is: to overcome the deficiencies in the prior art and to provide a redundant power supply switching filter which can basically realize seamless switching and ensure stable operation of rear-end load equipment.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a redundant power supply switching filter, including a DC relay, an EMI filtering circuit, a single-chip microcomputer, a control circuit, a detection circuit, a voltage conversion circuit, a first power supply circuit and a second power supply circuit, the input end of the DC relay is respectively connected to the AC input port A and the AC input port B, and its output end is connected to the AC output port through the EMI filtering circuit, the single-chip microcomputer is connected to the DC relay through the control circuit, the single-chip microcomputer is connected to the AC input port A through the detection circuit, and the single-chip microcomputer is respectively connected to the output end of the first power supply circuit and the output end of the second power supply circuit through the voltage conversion circuit, the input end of the first power supply circuit is connected to the AC input port A, and the input end of the second power supply circuit is connected to the AC input port B.

[0006] Furthermore, the control circuit includes a switching tube Q01, resistors R13 and R14, the collector c of the switching tube Q01 is connected to the DC relay, and its base b is connected to pin 3 of the microcontroller through the resistor R13, the emitter e of the switching tube Q01 is directly connected to pin 1 of the microcontroller, one end of the resistor R14 is connected to the base b of the switching tube Q01, and the other end is connected to the emitter e of the switching tube Q01.

[0007] Furthermore, the detection circuit includes optocouplers OC1, OC2, capacitor C07, resistors R07, R08, R09, and R12, the terminal 3 of the optocoupler OC1 is connected to the AC input port A through resistor R09, and its terminal 4 is connected to the AC input port A through resistors R08 and R07 in turn, the terminal 1 of the optocoupler OC1 is connected to the terminal 1 of the optocoupler OC2, and its terminal 2 is respectively connected to the terminal 2 of the optocoupler OC2 and the pin 2 of the microcontroller, the terminal 3 of the optocoupler OC2 is connected to the terminal 4 of the optocoupler OC1, and its terminal 4 is connected to the terminal 3 of the optocoupler OC1, one end of the resistor R12 is connected to the terminal 2 of the optocoupler OC2, and the other end is connected to the pin 1 of the microcontroller, and the capacitor C07 is connected in parallel to the resistor R12.

[0008] Furthermore, the first power supply circuit includes a power module P1, capacitors C01, C1, C3 and a common-mode capacitor CY3. Terminals 1 and 2 of the power module P1 are connected to the AC input port A, and terminal 3 of the power module P1 is connected to terminal 5 of the power module P1 through capacitor C1 and common-mode capacitor CY3 in sequence. One end of the capacitor C3 is connected to terminal 5 of the power module P1, and the other end is connected to terminal 6 of the power module P1. The capacitor C01 is connected in parallel to the capacitor C3, and terminal 4 of the power module P1 is connected to the common end of capacitor C1 and common-mode capacitor CY3.

[0009] Furthermore, the second power supply circuit includes a power module P2, capacitors C02, C2, C4 and a common-mode capacitor CY4. Terminals 1 and 2 of the power module P2 are connected to the AC input port B, and terminal 3 of the power module P2 is connected to terminal 5 of the power module P2 through capacitor C2 and common-mode capacitor CY4 in sequence. One end of the capacitor C4 is connected to terminal 5 of the power module P2, and the other end is connected to terminal 6 of the power module P2. The capacitor C02 is connected in parallel to the capacitor C4, and terminal 4 of the power module P2 is connected to the common end of capacitor C2 and common-mode capacitor CY4.

[0010] Furthermore, the voltage conversion circuit includes an integrated chip IC01, capacitors C03, C04, diodes D02, and D03. The input end of the integrated chip IC01 is connected to the output end of the integrated chip IC01 through capacitors C03 and C04 in sequence, the ground end of the integrated chip IC01 is connected to the common end of capacitors C03 and C04, the common end of the integrated chip IC01 and the capacitor C03 are respectively connected to the terminal 6 of the power module P2, one end of the diode D02, and one end of the diode D03, the other end of the diode D02 is connected to the terminal 6 of the power module P1, the other end of the diode D03 is respectively connected to the terminal 5 of the power module P1 and the terminal 5 of the power module P2, and the common end of the integrated chip IC01 and the capacitor C04 are respectively connected to the terminal 1 of the optocoupler OC1 and the pin 20 of the microcontroller.

[0011] Furthermore, the pin 1 of the single chip microcomputer is connected to the pin 20 of the single chip microcomputer through the capacitor C06 and the resistor R11 in sequence, and the pin 4 of the single chip microcomputer is connected to the common end of the capacitor C06 and the resistor R11.

[0012] Furthermore, it also includes a main controller, which is connected to the single-chip microcomputer.

[0013] The beneficial effects of the utility model are:

[0014] (1) The utility model samples the AC signal of the AC input port A through the detection circuit and transmits it to the single-chip microcomputer. The single-chip microcomputer controls the switching of the DC relay through the control circuit according to the AC signal. Compared with the AC relay, the DC relay uses a lower DC voltage to drive, so its coil discharges quickly and the switching is also fast, generally within 5-8mS, which basically realizes seamless switching, thereby ensuring the stable operation of the back-end load equipment.

[0015] (2) The utility model converts the voltage of the first power supply circuit and the second power supply circuit through a voltage conversion circuit, converting 12V into 5V to power the single-chip microcomputer, thereby ensuring the normal operation of the single-chip microcomputer, thereby ensuring that effective power supply can be achieved when either the AC input port A or the AC input port B is normal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0017] Figure 1 This is the circuit diagram of the AC relay in the existing power filter;

[0018] Figure 2 It is a circuit diagram of the utility model;

[0019] Figure 3 It is a circuit diagram of the detection circuit in the utility model.

[0020] In the figure: 1. DC relay; 2. EMI filter circuit; 3. Microcontroller; 4. Control circuit; 5. Detection circuit; 6. Voltage conversion circuit; 7. First power supply circuit; 8. Second power supply circuit; 9. Main controller. DETAILED DESCRIPTION

[0021] The present invention will now be further described with reference to the accompanying drawings, which are simplified schematic diagrams illustrating the basic structure of the present invention in a schematic manner, and thus only show components related to the present invention.

[0022] like Figure 2 and Figure 3 As shown, a redundant power switching filter includes a DC relay 1, an EMI filter circuit 2, a single-chip microcomputer 3, a control circuit 4, a detection circuit 5, a voltage conversion circuit 6, a first power circuit 7, and a second power circuit 8. The inputs of the DC relay 1 are connected to AC input ports A and B, respectively, and its output is connected to the AC output port via the EMI filter circuit 2. The single-chip microcomputer 3 is connected to the DC relay 1 via the control circuit 4. The single-chip microcomputer 3 is connected to the AC input port A via the detection circuit 5. The single-chip microcomputer 3 is connected to the outputs of the first power circuit 7 and the outputs of the second power circuit 8 via the voltage conversion circuit 6. The input of the first power circuit 7 is connected to the AC input port A, and the input of the second power circuit 8 is connected to the AC input port B. The detection circuit 5 samples the AC signal from the AC input port A and transmits it to the single-chip microcomputer 3. The single-chip microcomputer 3 controls the switching of the DC relay 1 via the control circuit 4 based on the AC signal. Compared with the AC relay, the DC relay 1 uses a lower DC voltage drive, so its coil discharges quickly and the switching is also fast, generally within 5-8 milliseconds, achieving essentially seamless switching, thereby ensuring stable operation of the back-end load equipment. Specifically, the AC input port A is the main circuit; the AC input port B is the auxiliary circuit; and the EMI filter circuit 2 is the existing technology.

[0023] like Figure 2 and Figure 3As shown, control circuit 4 includes a switch Q01, resistors R13, and R14. The collector c of switch Q01 is directly connected to DC relay 1, and its base b is connected to pin 3 of microcontroller 3 via resistor R13. The emitter e of switch Q01 is directly connected to pin 1 of microcontroller 3. One end of resistor R14 is connected to the base b of switch Q01, and the other end is connected to the emitter e of switch Q01. The switching of DC relay 1 is controlled by microcontroller 3 via switch Q01.

[0024] like Figure 2 and Figure 3 As shown, detection circuit 5 includes optocouplers OC1 and OC2, capacitor C07, resistors R07, R08, R09, and R12. Terminal 3 of optocoupler OC1 is connected to AC input port A via resistor R09, and terminal 4 thereof is connected to AC input port A via resistors R08 and R07, respectively. Terminal 1 of optocoupler OC1 is connected to terminal 1 of optocoupler OC2, and terminal 2 thereof is connected to terminal 2 of optocoupler OC2 and pin 2 of microcontroller 3, respectively. Terminal 3 of optocoupler OC2 is connected to terminal 4 of optocoupler OC1, and terminal 4 thereof is connected to terminal 3 of optocoupler OC1. One end of resistor R12 is connected to terminal 2 of optocoupler OC2, and the other end is connected to pin 1 of microcontroller 3. Capacitor C07 is connected in parallel with resistor R12. Detection circuit 5 can achieve AC sampling through two optocouplers and four resistors, and the two optocouplers isolate the AC signal. The circuit design is simple, practical, safe, stable, and reliable.

[0025] Since AC mains power is typically a 50 / 60Hz sinusoidal signal, optocouplers OC1 and OC2 enable relatively complete periodic sampling of the AC signal. Since AC is a periodic sinusoidal signal, optocouplers OC1 and OC2 are used to sample the positive and negative half-cycles of the signal. This results in a repetitive waveform with a 10mS period. Microcontroller 3 uses this 10mS periodicity to perform internal logic checks. If AC input port A loses power, microcontroller 3 reacts quickly, controlling switch Q01 to disconnect DC relay 1, which then quickly switches power to AC input port B. Conversely, if AC input port A is operating normally, it detects an AC signal and quickly connects DC relay 1, switching power to AC input port A. Using DC relay 1 significantly reduces switching time, keeping it under 15mS. Back-end load devices generally easily maintain a 15mS hold-up time, typically maintaining stable operation within this timeframe, thus achieving a virtually seamless switchover.

[0026] The first power supply circuit 7 includes a power module P1, capacitors C01, C1, C3 and a common-mode capacitor CY3. Terminals 1 and 2 of the power module P1 are connected to the AC input port A. Terminal 3 of the power module P1 is connected to terminal 5 of the power module P1 through capacitor C1 and common-mode capacitor CY3 in sequence. One end of capacitor C3 is connected to terminal 5 of the power module P1, and the other end is connected to terminal 6 of the power module P1. Capacitor C01 is connected in parallel to capacitor C3. Terminal 4 of the power module P1 is connected to the common end of capacitor C1 and common-mode capacitor CY3.

[0027] The second power supply circuit 8 includes a power module P2, capacitors C02, C2, C4 and a common-mode capacitor CY4. Terminals 1 and 2 of the power module P2 are connected to the AC input port B, and terminal 3 of the power module P2 is connected to terminal 5 of the power module P2 through capacitor C2 and common-mode capacitor CY4 in sequence. One end of capacitor C4 is connected to terminal 5 of the power module P2, and the other end is connected to terminal 6 of the power module P2. Capacitor C02 is connected in parallel to capacitor C4, and terminal 4 of the power module P2 is connected to the common end of capacitor C2 and common-mode capacitor CY4.

[0028] Power modules P1 and P2 convert AC input into DC output (output voltage is 12V) and isolate the AC input and DC output, so that the entire circuit will not be interfered with by the AC input, and is safe, stable and reliable.

[0029] The voltage conversion circuit 6 includes an integrated chip IC01, capacitors C03 and C04, and diodes D02 and D03. The input end of the integrated chip IC01 is connected to the output end of the integrated chip IC01 through capacitors C03 and C04 in sequence. The ground end of the integrated chip IC01 is connected to the common end of capacitors C03 and C04. The common end of the integrated chip IC01 and the capacitor C03 is respectively connected to the terminal 6 of the power module P2, one end of the diode D02, and one end of the diode D03. The other end of the diode D02 is connected to the terminal 6 of the power module P1. The other end of the diode D03 is respectively connected to the terminal 5 of the power module P1 and the terminal 5 of the power module P2. The common end of the integrated chip IC01 and the capacitor C04 is respectively connected to the terminal 1 of the optocoupler OC1 and the pin 20 of the microcontroller 3. The voltage of the first power supply circuit 7 and the second power supply circuit 8 is converted by the voltage conversion circuit 6, and the 12V DC output voltage is converted into 5V to power the microcontroller 3, thereby ensuring the normal operation of the microcontroller 3, thereby ensuring that effective power supply can be achieved no matter which of the AC input ports A and B is normal.

[0030] Pin 1 of the microcontroller 3 is connected to pin 20 of the microcontroller 3 via capacitor C06 and resistor R11, and pin 4 of the microcontroller 3 is connected to the common terminal of capacitor C06 and resistor R11. Capacitor C06 and resistor R11 are the reset pins of the microcontroller 3.

[0031] The redundant power switching filter further includes a main controller 9, which is connected to the single chip computer 3. Specifically, the main controller 9 is connected to pins 1, 18, 19, 20 of the single chip computer 3 and the common end of the capacitor C06 and the resistor R11.

[0032] The above-mentioned implementation mode is only for illustrating the technical concept and features of the utility model. Its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the scope of protection of the utility model.

Claims

1. A redundant power supply switching filter, characterized in that: The invention comprises a DC relay (1), an EMI filter circuit (2), a single chip microcomputer (3), a control circuit (4), a detection circuit (5), a voltage conversion circuit (6), a first power supply circuit (7) and a second power supply circuit (8); the input end of the DC relay (1) is respectively connected to an AC input port A and an AC input port B, and the output end thereof is connected to the AC output port via the EMI filter circuit (2); the single chip microcomputer (3) is connected to the DC relay (1) via the control circuit (4); the single chip microcomputer (3) is connected to the AC input port A via the detection circuit (5); the single chip microcomputer (3) is respectively connected to the output end of the first power supply circuit (7) and the output end of the second power supply circuit (8) via the voltage conversion circuit (6); the input end of the first power supply circuit (7) is connected to the AC input port A, and the input end of the second power supply circuit (8) is connected to the AC input port B.

2. The redundant power switching filter according to claim 1, wherein: The control circuit (4) comprises a switch tube Q01, resistors R13 and R14; the collector c of the switch tube Q01 is connected to the DC relay (1), and the base b thereof is connected to the pin 3 of the single-chip computer (3) through the resistor R13; the emitter e of the switch tube Q01 is directly connected to the pin 1 of the single-chip computer (3); one end of the resistor R14 is connected to the base b of the switch tube Q01, and the other end thereof is connected to the emitter e of the switch tube Q01.

3. The redundant power switching filter according to claim 1, wherein: The detection circuit (5) includes an optocoupler OC1, an OC2, a capacitor C07, resistors R07, R08, R09, and R12. The terminal 3 of the optocoupler OC1 is connected to the AC input port A through the resistor R09, and the terminal 4 thereof is connected to the AC input port A through the resistors R08 and R07 in sequence. The terminal 1 of the optocoupler OC1 is connected to the terminal 1 of the optocoupler OC2, and the terminal 2 thereof is respectively connected to the terminal 2 of the optocoupler OC2 and the pin 2 of the single-chip computer (3). The terminal 3 of the optocoupler OC2 is connected to the terminal 4 of the optocoupler OC1, and the terminal 4 thereof is connected to the terminal 3 of the optocoupler OC1. One end of the resistor R12 is connected to the terminal 2 of the optocoupler OC2, and the other end thereof is connected to the pin 1 of the single-chip computer (3). The capacitor C07 is connected in parallel with the resistor R12.

4. The redundant power switching filter according to claim 3, wherein: The first power supply circuit (7) includes a power module P1, capacitors C01, C1, C3 and a common-mode capacitor CY3. Terminals 1 and 2 of the power module P1 are connected to an AC input port A. Terminal 3 of the power module P1 is connected to terminal 5 of the power module P1 via capacitor C1 and common-mode capacitor CY3 in sequence. One end of the capacitor C3 is connected to terminal 5 of the power module P1, and the other end is connected to terminal 6 of the power module P1. The capacitor C01 is connected in parallel to the capacitor C3. Terminal 4 of the power module P1 is connected to a common end of capacitor C1 and common-mode capacitor CY3.

5. The redundant power switching filter according to claim 4, wherein: The second power supply circuit (8) includes a power module P2, capacitors C02, C2, C4 and a common-mode capacitor CY4. Terminals 1 and 2 of the power module P2 are connected to an AC input port B. Terminal 3 of the power module P2 is connected to terminal 5 of the power module P2 via capacitor C2 and common-mode capacitor CY4 in sequence. One end of the capacitor C4 is connected to terminal 5 of the power module P2, and the other end is connected to terminal 6 of the power module P2. The capacitor C02 is connected in parallel to the capacitor C4. Terminal 4 of the power module P2 is connected to a common end of capacitor C2 and common-mode capacitor CY4.

6. The redundant power switching filter according to claim 5, characterized in that: The voltage conversion circuit (6) includes an integrated chip IC01, capacitors C03 and C04, and diodes D02 and D03. The input end of the integrated chip IC01 is connected to the output end of the integrated chip IC01 through capacitors C03 and C04 in sequence. The ground end of the integrated chip IC01 is connected to the common end of capacitors C03 and C04. The common end of the integrated chip IC01 and the capacitor C03 is respectively connected to the terminal 6 of the power module P2, one end of the diode D02, and one end of the diode D03. The other end of the diode D02 is connected to the terminal 6 of the power module P1. The other end of the diode D03 is respectively connected to the terminal 5 of the power module P1 and the terminal 5 of the power module P2. The common end of the integrated chip IC01 and the capacitor C04 is respectively connected to the terminal 1 of the optocoupler OC1 and the pin 20 of the single-chip computer (3).

7. The redundant power switching filter according to claim 6, wherein: Pin 1 of the single chip microcomputer (3) is connected to pin 20 of the single chip microcomputer (3) via capacitor C06 and resistor R11 in sequence, and pin 4 of the single chip microcomputer (3) is connected to the common end of capacitor C06 and resistor R11.

8. The redundant power switching filter according to claim 1, wherein: It also includes a main controller (9), which is connected to the single chip computer (3).

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