A power-on timing control circuit
By designing a power-on timing control circuit, the system automatically detects the fixture's position and powers it on according to the specified timing, thus solving the problem of current surges caused by manual power-on and protecting the product from being burned out.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIHAI BROADCASTING TECHNOLOGY CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-06-02
AI Technical Summary
During set-top box testing, manually powering on the device can easily cause excessive current surges in the power-on module, potentially burning out the product.
Design a power-on timing control circuit, including a microcontroller main control circuit, a fixture positioning detection circuit, a relay output control circuit, an STB output interface, a USB output interface, and an LDO power supply circuit. The circuit automatically detects the fixture in position and powers on the fixture according to the specified timing, accurately controlling the delay time.
It enables automatic power-on according to the prescribed timing, avoiding current surges caused by manual power-on and protecting the product from being burned out.
Smart Images
Figure CN224317934U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit technology, specifically to a power-on timing control circuit. Background Technology
[0002] A power-on sequence control circuit is a circuit used to manage the activation of multiple power supply voltages in an electronic system in a specific sequence. During set-top box testing, when the product is connected for detection and power supply to the product and USB peripherals needs to be controlled, manual power-on can easily lead to excessive current surges in the power-on module, causing product burnout. To avoid such problems, a safe and reliable power-on sequence control circuit is needed to prevent product burnout caused by manual power-on. Utility Model Content
[0003] The purpose of this invention is to address the above-mentioned problems by providing a power-on timing control circuit that can automatically power on according to a specified timing sequence, accurately control the delay time, and avoid the problem of product burnout that can easily occur when manually powering on.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a power-on timing control circuit, including a microcontroller main control circuit, a fixture positioning detection circuit, a relay output control circuit, an STB output interface, a USB output interface, and an LDO power supply circuit. The LDO power supply circuit is used to provide 12V-5V voltage conversion to power the entire circuit. The fixture positioning detection circuit is connected to the microcontroller main control circuit and is used to detect the fixture positioning signal. The input terminal of the relay output control circuit is connected to the microcontroller main control circuit and is used to receive control signals. The output terminal of the relay output control circuit is connected to the STB output interface and the USB output interface respectively, and is used to control the power supply and disconnection of the STB output interface and the USB output interface according to the control signals.
[0005] Furthermore, the LDO power supply circuit includes a linear regulator U1, a linear regulator U2, capacitors C1, C2, C3, C6, C7, C8, C9, C10, and a resistor R6. The output terminal of the linear regulator U1 is connected to its input terminal through resistor R6. The input terminal of the linear regulator U1 is grounded through capacitors C1, C2, and C3 connected in parallel. The output terminal of the linear regulator U2 is grounded through capacitors C9 and C10 connected in parallel. The input terminal of the linear regulator U2 is grounded through capacitors C6, C7, and C8 connected in parallel. The input terminal of the linear regulator U2 is connected to a DC interface J1, one end of which is grounded. The input terminals of both linear regulators U1 and U2 are connected to a 12V power supply. The output terminal of the linear regulator U1 is connected to +5V. USB power supply, the output of the linear regulator U2 is connected to a +5V power supply.
[0006] Furthermore, the microcontroller main control circuit includes a microcontroller U3, a capacitor C11, and an interface ISP1. The VCC terminal of the microcontroller U3 is grounded through the capacitor C11. Pins 1 and 2 of the interface ISP1 are connected to the RX and TX terminals of the microcontroller U3, respectively. The VCC terminal of the microcontroller U3 is connected to a +5V power supply.
[0007] Furthermore, the fixture positioning detection circuit includes a switch and a resistor R1. Pin 1 of the switch is connected to pin 2 through resistor R1 and then connected to pin P3.2 of the microcontroller U3. Pin 3 of the switch is grounded.
[0008] Furthermore, the relay output control circuit includes a relay RELAY1, a switching diode D3, a transistor Q1, a resistor R4, a relay RELAY2, a switching diode D4, a transistor Q2, a resistor R5, a capacitor C4, a capacitor C5, and a resistor R7.
[0009] The base of transistor Q1 is connected to the P3.3 terminal of microcontroller U3 through resistor R4 to receive control signals. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to a 12V power supply through the coil of relay RELAY1. The switching diode D3 is connected in parallel across the coil of relay RELAY1. Contacts 2 and 7 of relay RELAY1 are respectively connected to the two ends of the USB output interface. The other end of contact 2 of relay RELAY1 is connected to a +5V USB power supply. Capacitors C4 and C5 are connected in parallel across the two ends of the USB output interface. Pins 2 and 3 of the USB output interface are grounded.
[0010] The base of transistor Q2 is connected to pin P3.4 of microcontroller U3 via resistor R5 to receive control signals. The emitter of transistor Q2 is grounded, and the collector of transistor Q2 is connected to a 12V power supply via the coil of relay RELAY2. The switching diode D4 is connected in parallel across the coil of relay RELAY2. Contacts 2 and 7 of relay RELAY2 are connected to the two ends of the UTB output interface, respectively. The other end of contact 2 of relay RELAY2 is connected to a 12V power supply via resistor R7, and the other end of contact 7 of relay RELAY2 is grounded. Pins 2 and 3 of the UTB output interface are grounded.
[0011] By adopting the above technical solution, this utility model has the following beneficial effects:
[0012] This utility model can automatically detect when the fixture is in place, and control the on / off of external devices connected to the STB output interface and USB output interface through the relay output control circuit to achieve power-on according to the specified timing. It can accurately control the delay time and avoid the problem of product burning that can easily be caused by manual power-on. Attached Figure Description
[0013] Figure 1 This is a circuit diagram of a power-on timing control circuit according to the present invention;
[0014] Figure 2 This is a circuit diagram of the microcontroller main control circuit of this utility model;
[0015] Figure 3 This is a circuit diagram of the fixture positioning detection circuit of this utility model;
[0016] Figure 4 This is a circuit diagram of the relay output control circuit of this utility model;
[0017] Figure 5 This is a circuit diagram of the LDO power supply circuit of this utility model;
[0018] In the diagram: 1-Microcontroller main control circuit, 2-Clamping position detection circuit, 3-Relay output control circuit, 4-LDO power supply circuit, 5-USB output interface, 6-STB output interface. Detailed Implementation
[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of the present invention are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.
[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0021] like Figure 1 As shown in the figure, a power-on timing control circuit includes a microcontroller main control circuit 1, a fixture positioning detection circuit 2, a relay output control circuit 3, an STB output interface 6, a USB output interface 5, and an LDO power supply circuit 4. The LDO power supply circuit 4 provides 12V-5V voltage conversion to power the entire circuit. The fixture positioning detection circuit 2 is connected to the microcontroller main control circuit 1 and is used to detect the fixture positioning signal. The input terminal of the relay output control circuit is connected to the microcontroller main control circuit 1 and is used to receive control signals. The output terminal of the relay output control circuit is connected to the STB output interface 6 and the USB output interface 5 respectively, and is used to control the power supply and disconnection of the STB output interface 6 and the USB output interface 5 according to the control signals.
[0022] like Figure 5As shown, the LDO power supply circuit 4 includes a linear regulator U1, a linear regulator U2, capacitors C1, C2, C3, C6, C7, C8, C9, C10, and a resistor R6. The output terminal of the linear regulator U1 is connected to its input terminal through resistor R6. The input terminal of the linear regulator U1 is grounded through capacitors C1, C2, and C3 connected in parallel. The output terminal of the linear regulator U2 is grounded through capacitors C9 and C10 connected in parallel. The input terminal of the linear regulator U2 is grounded through capacitors C6, C7, and C8 connected in parallel. The input terminal of the linear regulator U2 is connected to DC interface J1, with one end of DC interface J1 grounded. The input terminals of both linear regulators U1 and U2 are connected to a 12V power supply. The output terminal of the linear regulator U1 is connected to +5V. The USB power supply and the output of linear regulator U2 are connected to a +5V power supply. Both linear regulators U1 and U2 are model L78M05ABDT-TR.
[0023] like Figure 2 As shown, the microcontroller main control circuit 1 includes a microcontroller U3, a capacitor C11, and an interface ISP1. The VCC terminal of the microcontroller U3 is grounded through capacitor C11. Pins 1 and 2 of the interface ISP1 are connected to the RX and TX terminals of the microcontroller U3, respectively. The VCC terminal of the microcontroller U3 is connected to a +5V power supply. The model of the microcontroller U3 is STC8G1K08-TSSOP20.
[0024] like Figure 3 As shown, the fixture positioning detection circuit 2 includes a switch and a resistor R1. Pin 1 of the switch is connected to pin 2 through resistor R1 and then connected to pin P3.2 of the microcontroller U3. Pin 3 of the switch is grounded.
[0025] like Figure 4 As shown, the relay output control circuit includes relay RELAY1, switching diode D3, transistor Q1, resistor R4, relay RELAY2, switching diode D4, transistor Q2, resistor R5, capacitor C4, capacitor C5 and resistor R7.
[0026] The base of transistor Q1 is connected to the P3.3 terminal of microcontroller U3 through resistor R4 to receive control signals. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to a 12V power supply through the coil of relay RELAY1. Switching diode D3 is connected in parallel across the coil of relay RELAY1. Contacts 2 and 7 of relay RELAY1 are connected to the two ends of the USB output interface, respectively. The other end of contact 2 of relay RELAY1 is connected to a +5V USB power supply. Capacitors C4 and C5 are connected in parallel across the two ends of the USB output interface. Pins 2 and 3 of the USB output interface are grounded.
[0027] The base of transistor Q2 is connected to pin P3.4 of microcontroller U3 via resistor R5 to receive control signals. The emitter of transistor Q2 is grounded, and the collector of transistor Q2 is connected to a 12V power supply via the coil of relay RELAY2. Switching diode D4 is connected in parallel across the coil of relay RELAY2. Contacts 2 and 7 of relay RELAY2 are connected to the two ends of the UTB output interface, respectively. The other end of contact 2 of relay RELAY2 is connected to a 12V power supply via resistor R7, and the other end of contact 7 of relay RELAY2 is grounded. Pins 2 and 3 of the UTB output interface are grounded.
[0028] After the microcontroller U3 detects that the position switch is in position, the microcontroller U2 outputs a high level to control the switching transistor Q2 to conduct, energizing the coil of relay RELAY2. The contact 2 of relay RELAY2 closes to connect and supply power to the STB output interface 6. After waiting for 5 seconds, the microcontroller U2 outputs a high level to control the switching transistor Q1 to conduct, energizing the coil of relay RELAY1. The contact 2 of relay RELAY1 closes to connect and supply power to the USB interface.
[0029] Among them, capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, and C11 are 0805 1.5nF (152) 10% 50V capacitors. Resistors R1 and R4 are 0603 3.6K (3601) 1% resistors, resistor R5 is 0603 56 (56R0) 1% resistors, and resistors R6 and R7 are 0805 1 (1R00) 1% resistors.
[0030] When the microcontroller U3 detects that the switch is open, it outputs a low level and simultaneously controls the switching transistors Q1 and Q2 to turn off, thus turning off the coils of relays RELAY1 and RELAY2. The contacts 2 of relays RELAY1 and RELAY2 are both open, thereby stopping the power supply to the product and the USB device.
[0031] This invention can automatically detect when the fixture is in place and power on according to the specified timing. It can accurately control the delay time and avoid the problem of burning the product that can easily be caused by manual power-on.
[0032] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.
Claims
1. A power-on timing control circuit, characterized in that, The circuit includes a microcontroller main control circuit, a fixture positioning detection circuit, a relay output control circuit, an STB output interface, a USB output interface, and an LDO power supply circuit. The LDO power supply circuit provides 12V-5V voltage conversion to power the entire circuit. The fixture positioning detection circuit is connected to the microcontroller main control circuit and is used to detect the fixture positioning signal. The input terminal of the relay output control circuit is connected to the microcontroller main control circuit and is used to receive control signals. The output terminal of the relay output control circuit is connected to the STB output interface and the USB output interface respectively, and is used to control the power supply and disconnection of the STB output interface and the USB output interface according to the control signals.
2. The power-on timing control circuit according to claim 1, characterized in that, The LDO power supply circuit includes linear regulators U1 and U2, capacitors C1, C2, C3, C6, C7, C8, C9, C10, and resistor R6. The output terminal of linear regulator U1 is connected to its input terminal through resistor R6. The input terminal of linear regulator U1 is grounded through capacitors C1, C2, and C3 connected in parallel. The output terminal of linear regulator U2 is grounded through capacitors C9 and C10 connected in parallel. The input terminal of linear regulator U2 is grounded through capacitors C6, C7, and C8 connected in parallel. The input terminal of linear regulator U2 is connected to DC interface J1, one end of which is grounded. The input terminals of linear regulators U1 and U2 are connected to a 12V power supply. The output terminal of linear regulator U1 is connected to a +5V USB power supply, and the output terminal of linear regulator U2 is connected to a +5V power supply.
3. The power-on timing control circuit according to claim 2, characterized in that, The microcontroller main control circuit includes a microcontroller U3, a capacitor C11, and an interface ISP1. The VCC terminal of the microcontroller U3 is grounded through the capacitor C11. Pins 1 and 2 of the interface ISP1 are connected to the RX and TX terminals of the microcontroller U3, respectively. The VCC terminal of the microcontroller U3 is connected to a +5V power supply.
4. The power-on timing control circuit according to claim 3, characterized in that, The fixture positioning detection circuit includes a switch and a resistor R1. Pin 1 of the switch is connected to pin 2 through resistor R1 and then connected to pin P3.2 of the microcontroller U3. Pin 3 of the switch is grounded.
5. The power-on timing control circuit according to claim 3, characterized in that, The relay output control circuit includes relay RELAY1, switching diode D3, transistor Q1, resistor R4, relay RELAY2, switching diode D4, transistor Q2, resistor R5, capacitor C4, capacitor C5 and resistor R7. The base of transistor Q1 is connected to the P3.3 terminal of microcontroller U3 through resistor R4 to receive control signals. The emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to a 12V power supply through the coil of relay RELAY1. The switching diode D3 is connected in parallel across the coil of relay RELAY1. Contacts 2 and 7 of relay RELAY1 are respectively connected to the two ends of the USB output interface. The other end of contact 2 of relay RELAY1 is connected to a +5V USB power supply. Capacitors C4 and C5 are connected in parallel across the two ends of the USB output interface. Pins 2 and 3 of the USB output interface are grounded. The base of transistor Q2 is connected to pin P3.4 of microcontroller U3 via resistor R5 to receive control signals. The emitter of transistor Q2 is grounded, and the collector of transistor Q2 is connected to a 12V power supply via the coil of relay RELAY2. The switching diode D4 is connected in parallel across the coil of relay RELAY2. Contacts 2 and 7 of relay RELAY2 are connected to the two ends of the UTB output interface, respectively. The other end of contact 2 of relay RELAY2 is connected to a 12V power supply via resistor R7, and the other end of contact 7 of relay RELAY2 is grounded. Pins 2 and 3 of the UTB output interface are grounded.