Isolated power supply delay start circuit

Abstract

The utility model discloses isolated power supply delay starting circuit includes: high voltage control circuit: wiring terminal J3 and J4 are respectively connected to the 220V zero line and fire line of the input of total power supply via transformer, J5 and J6 are respectively connected to the 220V zero line and fire line of the power supply of external equipment host, J1 and J2 are respectively connected to the power supply of external equipment, J2, J3 and J5 are connected, J4 and J6 are connected, J1 is connected with J4 through relay output end, and the input end of relay is connected with the parallel capacitor C3 and the interface terminal CN3 of receiving 5V voltage; low voltage delay starting circuit: interface terminal CN1 positive output end is connected with the 5V power supply of external equipment host, is connected with ground through capacitor C1, is connected with ground through resistance R1 and capacitor C2, is connected with transistor base through resistance R1 and indicating lamp, and the collector of transistor is connected with CN1 positive output end through stabilivolt D1, and the both ends of stabilivolt are connected with the interface terminal CN2 of output 5V voltage.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to an isolated power supply delayed start circuit. Background Technology

[0002] In many electronic devices, especially industrial control equipment, communication equipment, and security monitoring equipment, a delayed startup circuit is typically used to prevent startup failures, data errors, or even hardware damage due to voltage instability or timing competition between modules during initial power-on. After the main power supply voltage stabilizes, the delayed startup circuit controls the power supply to subsequent circuits, thereby improving the overall system reliability.

[0003] The existing delayed startup solutions mainly include the following two types:

[0004] Software delay: Delay is implemented through a microcontroller (MCU) program. The delay time is easily adjustable, but it relies on the reliable operation of the MCU. If the program malfunctions or a reset error occurs during system power-on, the delay function will fail, resulting in lower reliability.

[0005] Dedicated delay chips: These use dedicated timing management chips. These chips are powerful and accurate, but they are also more expensive and have relatively complex peripheral circuits, making them less suitable for widespread use in cost-sensitive products.

[0006] Therefore, existing technologies suffer from problems such as insufficient reliability (software solutions) or high cost (dedicated chip solutions). This invention aims to provide a hardware-based, low-cost startup circuit solution with flexibly adjustable delay time. Utility Model Content

[0007] This invention addresses the problems and shortcomings of existing technologies by providing a novel isolated power supply delay start-up circuit.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] This utility model provides an isolated power supply delayed start circuit, characterized in that it includes a high-voltage control circuit and a low-voltage delayed start circuit.

[0010] The high-voltage control circuit includes: terminals J1-J6, interface terminal CN3 for receiving 5V voltage from the low-voltage delay start circuit, capacitor C3, and relay K1. Terminals J3 and J4 are respectively connected to the 220V neutral and 220V live wires input from the main power supply via a transformer. Terminals J5 and J6 are respectively connected to the 220V neutral and 220V live wires for power output to the external device host. Terminals J1 and J2 are respectively connected to wires for the 220V live wire and 220V neutral wire output to power the external device. Terminals J2, J3, and J5 are connected together, and terminals J4 and J6 are connected together. Terminal J1 is connected to terminal J4 through the output terminal of relay K1. The input terminal of relay K1 is connected to capacitor C3 and interface terminal CN3 in parallel.

[0011] The low-voltage delay start circuit includes: an interface terminal CN1 for receiving 5V power from an external device host, a resistor R1, a capacitor C1, an indicator LED1, a transistor Q1, a capacitor C2, a Zener diode D1, and an interface terminal CN2 for outputting 5V voltage. The positive output terminal of the interface terminal CN1 is connected to the 5V power supply, grounded through capacitor C1, grounded through resistor R1 and capacitor C2, and electrically connected to the base of transistor Q1 through resistor R1 and indicator LED1. The negative output terminal of the interface terminal CN1 is directly grounded. The collector of transistor Q1 is electrically connected to the positive output terminal of the interface terminal CN1 through Zener diode D1, and the emitter is grounded. The two ends of Zener diode D1 are connected to the interface terminal CN2.

[0012] The positive and progressive effects of this utility model are as follows:

[0013] 1. Simple structure and low cost: It uses all general-purpose electronic components, eliminating the need for microcontrollers or complex chips, thus reducing manufacturing costs and maintenance difficulty.

[0014] 2. Adjustable delay time: By changing the resistance or capacitance value in the RC circuit, the delay time can be flexibly adjusted to meet the needs of different application scenarios.

[0015] 3. High reliability: The hardware circuit has strong anti-interference ability and is not easily affected by program crashes or electromagnetic interference, making it suitable for industrial environments.

[0016] 4. Safe and reliable: The high-voltage control circuit and the low-voltage delay circuit are isolated by relays, which avoids the risk of high voltage entering the low-voltage circuit. The wiring layout is clear and reduces the possibility of misconnection.

[0017] 5. Indication function: LEDs provide a delay completion indication, making it easy for users to observe the circuit status.

[0018] 6. Economic and social benefits: This circuit can be widely used in power delay control in home appliances and industrial equipment, which helps to improve the service life and safety of the equipment and has good promotion value.

[0019] The above effects make this invention a significant improvement over existing technologies, solving the problems of high cost and poor stability of delay circuits. Attached Figure Description

[0020] Figure 1 This is a general block diagram of the isolated power supply delay start circuit of a preferred embodiment of the present invention.

[0021] Figure 2 This is a high-voltage control circuit diagram of a preferred embodiment of the present invention.

[0022] Figure 3 This is a low-voltage delay start-up circuit diagram of a preferred embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] like Figure 1-3 As shown, this embodiment provides an isolated power supply delay start circuit, which includes a high-voltage control circuit and a low-voltage delay start circuit. The high-voltage control circuit is disposed on the high-voltage control circuit board, and the low-voltage delay start circuit is disposed on the low-voltage delay start circuit board.

[0025] like Figure 1 As shown, the isolated power supply delay start circuit is divided into two parts: a high-voltage control section (high-voltage control circuit) and a low-voltage delay section (low-voltage delay start circuit). First, a power supply channel and a 5V input channel are reserved. The power supply channel is... Figure 2 Terminals J5 and J6 are connected to the 220V neutral and 220V live wires, respectively, to supply 220V power to the external device host (such as a computer that controls the external device). Figure 3The CN1 interface terminal is a 5V input channel. When this power supply channel supplies 220V to the external device host, and the external device host simultaneously supplies 5V power through the reserved 5V channel, the low-voltage delay start circuit receives the 5V power input and adjusts the delay time through its hardware RC circuit to control the conduction time of its transistor Q1, thereby controlling the relay K1 in the high-voltage control circuit to conduct, thus achieving delayed power supply start. This isolated power supply delay start circuit has a simple structure, requires no microcontroller, is low in cost, and the delay time can be flexibly adjusted by adjusting the RC value in the low-voltage delay start circuit.

[0026] like Figure 2 As shown, the high-voltage control circuit specifically includes: terminals J1-J6, interface terminal CN3 for receiving 5V voltage from the low-voltage delay start circuit, capacitor C3, and relay K1. Terminals J3 and J4 are respectively connected to the 220V neutral and 220V live wires input from the main power supply via a transformer. Terminals J5 and J6 are respectively connected to the 220V neutral and 220V live wires for power output to the external device host. Terminals J1 and J2 are respectively connected to wires for 220V live and 220V neutral wire output to power the external device. Terminals J2, J3, and J5 are connected together, and terminals J4 and J6 are connected together. Terminal J1 is connected to terminal J4 through the output terminal of relay K1. The input terminal of relay K1 is connected to capacitor C3 and interface terminal CN3 in parallel.

[0027] like Figure 3 As shown, the low-voltage delay start circuit specifically includes: an interface terminal CN1 for receiving 5V power from an external device host, a resistor R1, a capacitor C1, an indicator LED1, a transistor Q1, a capacitor C2, a Zener diode D1, and an interface terminal CN2 for outputting 5V voltage. The positive output terminal of interface terminal CN1 is connected to the 5V power supply provided by the external device host, and is also grounded through capacitor C1, resistor R1, and capacitor C2. It is also electrically connected to the base of transistor Q1 through resistor R1 and indicator LED1. The negative output terminal of interface terminal CN1 is directly grounded. The collector of transistor Q1 is electrically connected to the positive output terminal of interface terminal CN1 through Zener diode D1, and its emitter is grounded. The two ends of Zener diode D1 are connected to interface terminal CN2. Interface terminal CN2 outputs 5V voltage to interface terminal CN3.

[0028] In this embodiment, resistor R1 can be an adjustable resistor so that the delay time can be adjusted in real time.

[0029] In this embodiment, relay K1 can be a solid-state relay to improve lifespan and response speed.

[0030] In this embodiment, transistor Q1 can be an NPN transistor (such as 2N3904), as long as the parameters are matched.

[0031] The working principle of this embodiment is as follows:

[0032] Terminals J3 and J4 receive 220V input from the main power supply via a transformer. Since terminals J3 and J5 are connected and terminals J4 and J6 are connected, terminals J5 and J6 supply 220V power to the external device host. The external device host, such as a computer's USB interface, provides 5V power to interface terminal CN1.

[0033] After receiving the 5V power supply from the external device host, interface terminal CN1 sets the values ​​of R1 and C2 according to the required delay start time. When the predetermined delay time is reached, indicator LED1 lights up, transistor Q1 conducts, Zener diode D1 regulates the voltage to 5V, and interface terminal CN2 outputs 5V voltage. Figure 2 The interface terminal CN3.

[0034] Terminal J1 is connected to or disconnected from terminal J4 via relay K1. Interface terminal CN3 is used for receiving... Figure 3 When the 5V voltage is input to the interface terminal CN2, and the interface terminal CN3 receives a 5V signal, the relay K1 reaches the activation condition. The wiring terminals J1 and J4 are connected. At this time, the power supply channel formed by the wires connecting the wiring terminals J3 and J4 to the wiring terminals J2 and J1 can normally output 220V power to power external devices (such as signal acquisition devices).

[0035] In this embodiment, the RC delay circuit in the low-voltage delay start-up circuit achieves the delay through a simple combination of resistors and capacitors, which is low-cost and easy to adjust (the delay time can be changed by replacing R1 or C2). Its function is to provide an adjustable delay signal, requiring no programming and offering high stability.

[0036] In this embodiment, the transistor drives the relay: transistor Q1 (model SS8050Y1) is used as a switch to drive relay K1. Its function is to amplify the signal, ensure reliable relay engagement, and isolate the low-voltage and high-voltage sections.

[0037] In this embodiment, the high-voltage control layout uses a specific connection method for terminals J1-J6 (terminals J4 and J6 are connected, and terminals J2, J3, and J5 are connected; terminals J1, J4, and J6 are connected or disconnected via relay K1). This simplifies the high-voltage circuit, reduces wiring errors, and allows terminal J6 to be connected to the 220V live wire and terminal J5 to the 220V neutral wire. When relay K1 is engaged, terminals J1 and J2 can be used as the 220V live wire and 220V neutral wire outputs, respectively, and can be connected to multiple external lines to expand multi-channel power output. This improves safety and facilitates installation and maintenance.

[0038] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An isolated power supply delay start-up circuit, characterized in that, It includes a high-voltage control circuit and a low-voltage delayed start-up circuit; The high-voltage control circuit includes: terminals J1-J6, interface terminal CN3 for receiving 5V voltage from the low-voltage delay start circuit, capacitor C3, and relay K1. Terminals J3 and J4 are respectively connected to the 220V neutral and 220V live wires input from the main power supply via a transformer. Terminals J5 and J6 are respectively connected to the 220V neutral and 220V live wires for power output to the external device host. Terminals J1 and J2 are respectively connected to wires for the 220V live wire and 220V neutral wire output to power the external device. Terminals J2, J3, and J5 are connected together, and terminals J4 and J6 are connected together. Terminal J1 is connected to terminal J4 through the output terminal of relay K1. The input terminal of relay K1 is connected to capacitor C3 and interface terminal CN3 in parallel. The low-voltage delay start circuit includes: an interface terminal CN1 for receiving 5V power from an external device host, a resistor R1, a capacitor C1, an indicator LED1, a transistor Q1, a capacitor C2, a Zener diode D1, and an interface terminal CN2 for outputting 5V voltage. The positive output terminal of the interface terminal CN1 is connected to the 5V power supply, grounded through capacitor C1, grounded through resistor R1 and capacitor C2, and electrically connected to the base of transistor Q1 through resistor R1 and indicator LED1. The negative output terminal of the interface terminal CN1 is directly grounded. The collector of transistor Q1 is electrically connected to the positive output terminal of the interface terminal CN1 through Zener diode D1, and the emitter is grounded. The two ends of Zener diode D1 are connected to the interface terminal CN2.

2. The isolated power supply delay start circuit as described in claim 1, characterized in that, The resistor R1 is an adjustable resistor.

3. The isolated power supply delay start circuit as described in claim 1, characterized in that, The relay K1 is a solid-state relay.

4. The isolated power supply delay start circuit as described in claim 1, characterized in that, The transistor Q1 is an NPN transistor.

5. The isolated power supply delay start circuit as described in claim 1, characterized in that, The high-voltage control circuit is mounted on the high-voltage control circuit board, and the low-voltage delay start circuit is mounted on the low-voltage delay start circuit board.

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