Power delay-on circuit, circuit board and microwave communication equipment

Abstract

The application provides a power supply delay starting circuit, a circuit board and a microwave communication device, relates to the technical field of electronic circuits, and solves the problem that microwave communication devices are easily affected by sharp peak currents and are difficult to work normally in the related art. According to the scheme, the RC charging unit can control the corresponding delay time. When the device starts, the first switch unit is in a closed state first, and the second switch unit is turned on first, so that the circuit output end presents a low impedance state. After the voltage of the capacitor in the RC charging unit rises to make the first switch unit conductive, the second switch unit is closed, so that the circuit output end presents a high impedance state, and the working state of other devices or equipment is controlled, and the delay starting control of the other devices or equipment is realized.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and more particularly to a power supply delay start-up circuit, a circuit board, and microwave communication equipment. Background Technology

[0002] Typically, when a power supply is powered on simultaneously with other devices, a large current spike is generated on the power supply line at the moment of power-on. This spike can affect the normal operation of the equipment. For example, in the field of microwave communication, microwave communication equipment includes an IDU (Indoor Unit) and an ODU (Outdoor Unit). The IDU is responsible for signal processing and control, while the ODU is responsible for signal transmission and reception. After startup, the IDU limits the load current for a certain period (e.g., 1 second). If the ODU starts within this time, the IDU will generate a current spike. Upon detecting excessive current (such as this spike), the IDU will shut down its output. This results in repeated shutdowns and restarts of the ODU and IDU, affecting the normal operation of the microwave communication equipment. Utility Model Content

[0003] This application provides a power supply delay start-up circuit, circuit board, and microwave communication equipment, which solves the problem in related technologies that microwave communication equipment is easily affected by peak current and cannot work properly. This solution can enable the power supply to achieve a reasonable delay start-up purpose according to the delay time requirement, which helps to ensure the normal operation of the equipment.

[0004] In a first aspect, this application provides a power delay start-up circuit, which includes an RC charging unit, a discharging unit, a first switching unit, and a second switching unit.

[0005] The RC charging unit is used to receive the operating voltage to store charge and maintain the preset voltage of the capacitor in the RC charging unit when charging is complete. The discharging unit is connected in parallel with the RC charging unit and is used to form a discharge circuit to provide voltage signals to other units in the next stage through the discharge terminal. The control terminal of the first switching unit is connected to the discharge terminal of the discharge unit, the input terminal of the first switching unit is connected to the operating voltage, and the output terminal of the first switching unit is grounded. The first switching unit is used to provide control signals to other units in the next stage through the feedback terminal when receiving a voltage signal. The control terminal of the second switching unit is connected to the feedback terminal of the first switching unit, one end of the second switching unit is grounded, and the other end of the second switching unit is used to connect to the control terminal of the power control chip. The second switching unit is used to control the power control chip to be in the on state when receiving a control signal.

[0006] Secondly, this application also provides a circuit board, which includes the power delay start-up circuit and power control chip provided in the first aspect above. The power control chip is connected to the power delay start-up circuit, and the power delay start-up circuit is used to control the working state of the power control chip.

[0007] Thirdly, this application also provides a microwave communication device, which includes the circuit board as provided in the second aspect.

[0008] The present application solution can control the corresponding delay time through the RC charging unit. When the device is started, the first switching unit is initially in the off state, while the second switching unit is initially turned on, making the circuit output terminal present a low impedance state. In the RC charging unit, the voltage of the capacitor rises so that the first switching unit is turned on, and the second switching unit is turned off, thereby making the circuit output terminal present a high impedance state, thereby controlling the working state of other devices or equipment and realizing the delayed start control of other devices or equipment. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a power delay start-up circuit provided in one embodiment of this application.

[0010] Figure 2 This is a schematic diagram of the circuit structure of a power delay start-up circuit provided in an embodiment of this application. Detailed Implementation

[0011] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this application and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, the accompanying drawings only show the parts related to the embodiments of this application, not all structures. Those skilled in the art, after reading this specification, should be able to conceive that any combination of technical features can constitute an optional implementation method, provided that the technical features do not contradict each other.

[0012] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship. In the description of this application, "multiple" means two or more, and "several" means one or more.

[0013] In related technologies, microwave communication equipment includes an IDU and an ODU. During the startup phase, the IDU charges the capacitors connected to it, and the load current is limited. However, the ODU load generates a large inrush current during startup. Typically, the IDU limits the load current for a certain period (e.g., 1 second) after startup. If the ODU starts within this time, the IDU will generate a current spike. Upon detecting excessive current (such as the spike current), the IDU will shut down its output, causing repeated shutdown and restart of both the ODU and IDU, affecting the normal operation of the microwave communication equipment. Related technologies use digital logic devices, such as programmable gate arrays, to construct digital delays, or utilize NE555 timers for delay control. However, these solutions have complex circuit structures, numerous electronic components, and occupy a large space, making them unsuitable for integration on a PCB (Printed Circuit Board).

[0014] In response, this application provides a power delay start-up circuit, which can be used to control the power usage time of the ODU to be delayed relative to the IDU. This circuit can set the delay time, thereby controlling the working state of the power control chip and realizing the delayed start-up of the power supply. Figure 1 The schematic diagram of a power delay start circuit provided in an embodiment of this application is shown in the figure. The power delay start circuit includes an RC charging unit 101, a discharging unit 102, a first switching unit 103, and a second switching unit 104.

[0015] The RC charging unit 101 is used to receive the operating voltage to store charge and maintain a preset voltage in the capacitor of the RC charging unit 101 after charging is completed. For example, the RC charging unit 101 is connected to the output terminal of the power supply device to receive the operating voltage provided by the power supply device, so that the capacitor can maintain the operating voltage after charging is completed. The discharging unit 102 is connected in parallel with the RC charging unit 101. The control terminal of the first switching unit 103 is connected to the discharging terminal of the discharging unit 102, the input terminal of the first switching unit 103 is connected to the operating voltage, and the output terminal of the first switching unit 103 is grounded. The control terminal of the second switching unit 104 is connected to the feedback terminal of the first switching unit 103, one end of the second switching unit 104 is grounded, and the other end of the second switching unit 104 is used to connect to the control terminal of the power control chip. The discharge unit 102 is used to form a discharge circuit to receive the charge released by the RC charging unit 101 and to provide a voltage signal to other units in the next stage through the discharge terminal. The first switching unit 103 is used to provide a control signal to other units in the next stage through the feedback terminal when the voltage signal is received. The second switching unit 104 is used to control the power control chip to be in the on state when the control signal is received.

[0016] It is understood that the RC charging unit 101 includes a resistor and a capacitor. After being connected to a power source, the capacitor in the RC charging unit 101 stores charge for charging, thus completing the charging process. Furthermore, after charging is complete, the capacitor in the RC charging unit 101 can maintain a certain voltage to supply power to other units. The discharging unit 102 provides a corresponding discharge circuit for the RC charging unit 101 after the device is powered off. The first switching unit 103 and the second switching unit 104 form a two-stage control system. Upon receiving a voltage signal from the discharging unit 102, the first switching unit 103 turns on and provides a control signal to the second switching unit 104 through its feedback terminal. This control signal controls the second switching unit 104 to turn on, thereby controlling the power control chip to be in the ON state. The power control chip acts as a device that controls the power output to start the device; for example, in microwave communication equipment, the power control chip can be used to control the startup of the ODU.

[0017] As can be seen from the above scheme, the scheme of this application can control the corresponding delay time through the RC charging unit. When the device starts, the first switching unit is initially in the off state, while the second switching unit is initially turned on, making the circuit output terminal present a low impedance state. In the RC charging unit, the voltage of the capacitor rises so that the first switching unit is turned on, and the second switching unit is turned off, thereby making the circuit output terminal present a high impedance state, thereby controlling the working state of other devices or equipment and realizing the delayed start control of other devices or equipment.

[0018] In one embodiment, the RC charging unit includes a first resistor and a first capacitor. A first terminal of the first resistor is connected to the operating voltage, a second terminal of the first resistor is connected to the first terminal of the first capacitor, and the second terminal of the first capacitor is grounded. That is, the first resistor and the first capacitor are connected in series to charge using the operating voltage provided by another device. Initially, the capacitor voltage is 0, and the charging current is at its maximum. However, as the capacitor voltage increases, the current gradually decreases, and eventually the capacitor voltage approaches the operating voltage, indicating that charging is complete. It is conceivable that the charging speed and voltage change are determined by a time constant. Optionally, the first capacitor is an energy storage capacitor, which possesses the energy storage characteristics of a battery. Therefore, this solution uses an energy storage capacitor to achieve charging and discharging, enabling the RC charging unit to complete the charging operation.

[0019] In one embodiment, the discharge unit includes a second resistor and a first diode. Specifically, the cathode of the first diode is connected to the operating voltage, the anode of the first diode is connected to the first terminal of the second resistor, and the first terminal of the second resistor is also connected to the first terminal of the first capacitor. The second terminal of the second resistor is grounded, with the first terminal of the second resistor serving as the discharge terminal of the discharge unit. It is understood that the first diode and the second resistor are connected in series, and the first diode is reverse-biased, which allows the discharge unit to form a high-impedance state. The second resistor can be connected in parallel with the capacitor in the RC charging unit, so that the potential at the first terminal of the second resistor continuously increases as the capacitor charges. Optionally, the first diode is a Schottky diode. When the Schottky diode is in a reverse-biased state, its barrier layer widens, and its internal resistance increases. This characteristic effectively blocks current flow through the second resistor, thus isolating the second resistor from the operating voltage. Furthermore, after the power supply to the device is removed, the Schottky diode has a smaller forward voltage drop, which is beneficial for capacitor discharge. Therefore, this solution provides a corresponding voltage signal to the first switching unit through the discharge unit to control the state of the first switching unit, thereby facilitating delayed start control.

[0020] In one embodiment, the first switching unit includes a third resistor and a first field-effect transistor (FET). The first terminal of the third resistor is connected to the operating voltage, the second terminal of the third resistor is connected to the drain terminal of the first FET, the source terminal of the first FET is grounded, and the gate terminal of the first FET serves as the control terminal of the first switching unit. Optionally, the first FET is an NMOS (N-Metal-Oxide-Semiconductor) transistor. When the voltage at the discharge terminal of the discharge unit increases and the voltage between the gate and source terminals of the NMOS transistor meets the turn-on voltage, the NMOS transistor is turned on, i.e., the first switching unit is in the ON state. The drain terminal of the first FET serves as the feedback terminal of the first switching unit. When the first switching unit is in the ON state, the voltage at the drain terminal of the first FET decreases, which is then transmitted to the second switching unit to form a control signal, thereby controlling the state of the second switching unit.

[0021] In one embodiment, the second switching unit includes a second field-effect transistor (FET). The gate of the second FET is connected to the second terminal of a third resistor, the source terminal of the second FET is grounded, and the drain terminal of the second FET is used to connect to the control terminal of a power control chip. Optionally, the second FET is an NMOS transistor. Since the gate of the second FET can be connected to the operating voltage through the third resistor, the voltage between the gate and source terminals of the second FET satisfies the conduction condition, and the second FET is in the on state. However, when the first switching unit is in the on state, the voltage at the gate of the second FET is pulled low, so that the voltage between the gate and source terminals of the second FET does not satisfy the conduction condition, and the second switching unit is turned off.

[0022] Figure 2 The circuit diagram shown in the figure illustrates a power delay startup circuit according to an embodiment of this application. The circuit includes a first resistor R1, a first capacitor C1, a second resistor R2, a first diode D1, a third resistor R3, a first NMOS transistor Q1, and a second NMOS transistor Q2. Specifically, the first resistor R1 and the first capacitor C1 form an RC charging unit. The first terminal of the first resistor R1 is connected to the operating voltage, and the second terminal of the first resistor R1 is connected to the first terminal of the first capacitor C1, which is grounded. The cathode of the first diode D1 is connected to the operating voltage, and the anode of the first diode D1 is connected to the first terminal of the second resistor R2. The first terminal of the second resistor R2 is also connected to the first terminal of the first capacitor C1, and the second terminal of the second resistor R2 is grounded, effectively making the second resistor R2 and the first capacitor C1 connected in parallel. Furthermore, the gate of the first NMOS transistor Q1 is connected to the first terminal of the second resistor R2, the first terminal of the third resistor R3 is connected to the operating voltage, the second terminal of the third resistor R3 is connected to the drain terminal of the first NMOS transistor Q1, and the source terminal of the first NMOS transistor Q1 is grounded. The gate of the second NMOS transistor Q2 is connected to the second terminal of the third resistor R3. The source terminal of the second NMOS transistor Q2 is grounded, and the drain terminal of the second NMOS transistor Q2 serves as the output terminal of the circuit to output a corresponding voltage signal to other devices (such as a power control chip) to control their state. Optionally, the drain terminal of the second NMOS transistor Q2 is connected to the startup delay control terminal or the common terminal of the power control chip.

[0023] Understandably, the first capacitor C1 is charged using the operating voltage. Initially, the voltage across C1 is 0, and the charging current is at its maximum. As the capacitor voltage increases, the current gradually decreases until the voltage approaches the operating voltage, indicating charging is complete. C1 then discharges, causing the voltage across the first terminal of the second resistor R2 to rise, which in turn raises the gate voltage of the first NMOS transistor Q1, turning it on. Since the second resistor R2 is connected to the operating voltage, the voltage difference between the gate and source terminals of the second NMOS transistor Q2 meets the conduction condition, turning Q2 on. However, after Q1 turns on, the gate voltage of Q2 drops, causing Q2 to turn off. In other words, Q2 is on when Q1 is not on, and off when Q1 is on. With Q2 off, the circuit output exhibits a high impedance state.

[0024] This solution achieves delayed start control through a simple circuit structure, ensuring high circuit reliability. This allows the system to smoothly enter normal operating conditions while saving circuit board space.

[0025] This application also provides a circuit board, which includes a power control chip and a power delay start circuit provided in the above embodiments. The power control chip is connected to the power delay start circuit, that is, connected to the other end of the second switching unit, so as to control the working state of the power control chip through the power delay start circuit, thereby playing the role of delayed start.

[0026] This application also provides a microwave communication device, which includes the circuit board provided in the above embodiments. The microwave communication device can control the working state of the power control chip through the power delay start circuit on the circuit board to realize the delayed start of the power supply, so that the power usage time of the ODU is delayed relative to the IDU, which helps to ensure the stable operation of the device.

[0027] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0028] Note that the above description is merely a preferred embodiment and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of this application, and the scope of this application is determined by the scope of the appended claims.

Claims

1. A power-delay start-up circuit, characterized in that, include: An RC charging unit is used to receive a working voltage to store charge and to maintain a preset voltage in the capacitor of the RC charging unit when charging is complete. A discharge unit is connected in parallel with the RC charging unit. The discharge unit is used to form a discharge circuit and provide a voltage signal to other units in the next stage through the discharge terminal. The first switching unit has a control terminal connected to the discharge terminal of the discharge unit, an input terminal connected to the operating voltage, and an output terminal grounded. The first switching unit is used to provide control signals to other units in the next stage through a feedback terminal when it receives the voltage signal. The second switching unit has its control terminal connected to the feedback terminal of the first switching unit. One end of the second switching unit is grounded, and the other end is used to connect to the control terminal of the power control chip. The second switching unit is used to control the power control chip to be in the on state when it receives the control signal.

2. The power delay start-up circuit according to claim 1, characterized in that, The RC charging unit includes a first resistor and a first capacitor. The first end of the first resistor is connected to the operating voltage, the second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is grounded.

3. The power delay start-up circuit according to claim 2, characterized in that, The first capacitor is an energy storage capacitor.

4. The power delay start-up circuit according to claim 2, characterized in that, The discharge unit includes a second resistor and a first diode. The cathode of the first diode is connected to the operating voltage, and the anode of the first diode is connected to the first end of the second resistor. The first end of the second resistor is also connected to the first end of the first capacitor, and the second end of the second resistor is grounded. The first end of the second resistor serves as the discharge terminal of the discharge unit.

5. The power-delay start-up circuit according to claim 4, characterized in that, The first diode is a Schottky diode.

6. The power-delay start-up circuit according to any one of claims 1-5, characterized in that, The first switching unit includes a third resistor and a first field-effect transistor. The first end of the third resistor is connected to the operating voltage, the second end of the third resistor is connected to the drain terminal of the first field-effect transistor, the source terminal of the first field-effect transistor is grounded, and the gate terminal of the first field-effect transistor serves as the control terminal of the first switching unit.

7. The power-delay start-up circuit according to claim 6, characterized in that, The second switching unit includes a second field-effect transistor (FET), the gate of which is connected to the second terminal of the third resistor, the source of which is grounded, and the drain of which is connected to the control terminal of the power control chip.

8. The power-delay start-up circuit according to claim 7, characterized in that, Both the first field-effect transistor and the second field-effect transistor are NMOS transistors.

9. A circuit board, characterized in that, It includes a power control chip and a power delay start-up circuit as described in any one of claims 1-8, wherein the power control chip is connected to the power delay start-up circuit, and the power delay start-up circuit is used to control the operating state of the power control chip.

10. A microwave communication device, characterized in that, Includes the circuit board as described in claim 9.

Images