CN219497031U

CN219497031U - AC-DC (alternating current-direct current) transformation circuit for main board

Info

Publication number: CN219497031U
Application number: CN202223345914.0U
Authority: CN
Inventors: 刘晓; 张振; 刘如军
Original assignee: Suzhou Zhide Chuangxing Technology Co ltd
Current assignee: Suzhou Zhide Chuangxing Technology Co ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-08-08
Anticipated expiration: 2032-12-14

Abstract

The utility model discloses an AC-DC (alternating current-direct current) transformation circuit for a main board, which belongs to the technical field of power control and comprises an AC-DC conversion module, a singlechip system and a contact type double-way relay, wherein the input end and the output end of the AC-DC conversion module are respectively connected with a mains supply and the contact type double-way relay, the singlechip system is in signal connection with the contact type double-way relay, the contact type double-way relay and the singlechip system are respectively connected with the main board through a voltage output interface and an RS485 interface, all devices of the circuit are low in cost, monitoring on peripheral equipment can be realized, dead halt is prevented, and for a main board with a longer starting time and a system main board with a longer starting time, resetting time can be modified through loading software, and re-resetting and dead circulation caused when the system is not started; the applicability is strong, and most of low-voltage direct current circuits are applicable; the module can be directly connected with commercial power for use, can be integrated on a control board, and is flexible in application.

Description

AC-DC (alternating current-direct current) transformation circuit for main board

Technical Field

The utility model relates to the technical field of power supply control, in particular to an AC-DC (alternating current-direct current) transformation circuit for a main board.

Background

In operation, the motherboard may require different power supply voltages for the various functional circuits therein. In general, the existing main board is usually required to supply several voltages of 12V, 5V, 3.3V and the like, the current technical scheme is to use a chip with a watchdog or a hardware watchdog, the system is required to perform the watchdog feeding operation at regular time, the system is determined to be dead when the system is not in a state of being fed for a long time, the principle is as shown in fig. 1, in the scheme, an IO port of an MCU is required to continuously feed the watchdog chip, when the watchdog chip does not receive a watchdog feeding signal within 1-2s (which can be set through a hardware resistor and is not more than 3s generally), the system is determined to be dead, then a reset pin of the MCU is pulled down to reset the system, the current technical scheme monitors and resets the system through the hardware watchdog, the monitored time is determined by the hardware watchdog, but the time of the hardware watchdog is usually 3s at most, the starting time of a singlechip system is very short, and the system is started within 3s and then fed; however, the starting time of the main board with the system is 7-8s or longer, when the system is not yet started, the time for feeding dogs of the hardware watchdog is exceeded, so that the system is reset, and then falls into dead circulation, so that the circuit cannot be started normally, and therefore, a novel control circuit for the main board is needed to be designed.

Disclosure of Invention

The utility model aims to provide an AC-DC voltage transformation circuit for a main board, which solves the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an AC-DC transformation circuit for mainboard, includes AC-DC conversion module, singlechip system and contact type double-circuit relay, the input and the output of AC-DC conversion module connect commercial power and contact type double-circuit relay respectively, singlechip system and contact type double-circuit relay signal connection, contact type double-circuit relay and singlechip system are connected with the mainboard through voltage output interface and RS485 interface respectively, singlechip system includes STC8G1K08 chip, the RST port of STC8G1K08 chip has connected capacitor C11 and resistance R6 in parallel, the other end ground connection of capacitor C11, 3.3V power is connected to the other end of resistance R6, the VCC port of STC8G1K08 chip has connected 3.3V power and capacitor C12 in parallel, the other end ground connection of capacitor C12, the P3.3 port of STC8G1K08 chip has connected resistor R8, the other end of resistor R8 is connected with triode Q1, the ground connection of transistor Q1, the other end ground connection of triode Q1G 1K08 chip has connected with the P3.3V power and the other end of triode R7 in series connection with the diode D1, the other end of triode R7 and the diode D1 and the other end of resistor R6 has connected in series with the triode 3D 1.

Preferably, the AC-DC conversion module adopts a packaged AD-DC power module, an SP3075 chip is further connected between the singlechip system and the RS485 interface of the main board, and a DC-DC switching power supply is further connected in series between the AC-DC conversion module and the contact type double-way relay.

Preferably, the contact type two-way relay is HFD4/5-S.

Preferably, the type of the DC-DC switching power supply is MP1593DN.

Preferably, uart_tx and uart_rx ports of the SP3075 chip are respectively connected to the other end of the resistor R12 and the cathode of the diode D7.

Compared with the prior art, the utility model has the beneficial effects that: the utility model has low cost of all devices, can realize the monitoring of peripheral equipment, prevents the dead halt, and can also prevent the resetting from being carried out again when the system is not started and falls into dead circulation by loading software to modify the resetting time of the system main board with longer starting time; the applicability is strong, and most of low-voltage direct current circuits are applicable; the module can be directly connected with commercial power for use, can be integrated on a control board, and is flexible in application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art circuit;

FIG. 2 is a schematic illustration of the use of the present utility model;

FIG. 3 is a schematic diagram of a first circuit of the present utility model;

FIG. 4 is a circuit diagram of the connection of the SCM system and the contact type two-way relay;

fig. 5 is a schematic diagram of a second circuit of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Example 1

Referring to fig. 2-4, the present utility model provides a technical solution: an AC-DC transformation circuit for a main board comprises an AC-DC conversion module, a singlechip system and a contact type double-way relay, wherein the input end and the output end of the AC-DC conversion module are respectively connected with a mains supply and the contact type double-way relay, the singlechip system is in signal connection with the contact type double-way relay, the contact type double-way relay and the singlechip system are respectively connected with the main board through a voltage output interface and an RS485 interface, the singlechip system comprises an STC8G1K08 chip, the RST port of the STC8G1K08 chip is connected with a capacitor C11 and a resistor R6 in parallel, the other end of the capacitor C11 is grounded, the other end of the resistor R6 is connected with a 3.3V power supply, the VCC port of STC8G1K08 chip has connect 3.3V power and electric capacity C12 in parallel, electric capacity C12's the other end ground connection, STC8G1K08 chip's P3.3 port has concatenated resistance R8, resistance R8's the other end is connected with triode Q1, triode Q1's projecting pole ground connection, triode Q1's collecting electrode has concatenated resistance R7, diode D4 and contact double-circuit relay's No. 8 port has been connected in parallel to resistance R7's the other end, diode D4's negative pole and contact double-circuit relay No. 1 port connection, STC8G1K08 chip's P3.1 and P3.0 port have connect in series resistance R12 and diode D7 respectively, specifically: the AC-DC conversion module is fused with the singlechip control circuit, so that the AC power supply is converted into the DC power supply, the on-off of the DC power supply can be controlled, a command is required to be sent to the singlechip at fixed time through the 485 interface, otherwise, the DC power supply is cut off and is electrified again after a certain time, the monitoring of the back-end circuit is realized, and the dead halt is prevented; in the illustration, AC is the input of alternating current of the commercial power, the input range can reach 100-250Vac, most commercial power can be met, and the alternating current can be converted into low-voltage direct current through an AC-DC conversion module in a controller; the singlechip system is an MCU with low cost and low power consumption, and can input instructions through a serial port or a 485 interface; the singlechip can carry out switch control on the output direct-current power supply through IO;

the AC-DC power supply is combined with the singlechip control system, so that the control of the peripheral circuit power supply can be realized; the 485 interface or serial port protocol can be defined according to the requirements, instructions are continuously sent to the singlechip, when an external system is halted and the power supply controller cannot receive instruction signals, namely, the external power supply is turned off and is electrified again, the time interval and the turn-off time of the controller for sending the instructions to the external circuit can be defined by software (belonging to the prior art), and the compatibility is strong; therefore, when the external circuit is started for a long time, the time for sending the instruction can be adjusted according to the requirement so as to meet the requirement.

Example two

Referring to fig. 5, in the original circuit, an AC-DC conversion module adopts a packaged AD-DC power module, an SP3075 chip is further connected between the singlechip system and the RS485 interface of the motherboard, and a DC-DC switching power supply is further connected in series between the AC-DC conversion module and the contact type two-way relay; UART_TX and UART_RX ports of the SP3075 chip are respectively connected with the other end of the resistor R12 and the cathode of the diode D7, and the contact type double-circuit relay type number is HFD4/5-S, so that the relay is small in size and strong in switching capacity; the DC-DC switching power supply can be selected according to the needs, and the scheme selects MP1593DN of MPS manufacturer, can adjust voltage output through resistance, and can be adjusted to various required power supplies of 3.3V, 5V, 9V and the like; the method comprises the following steps: the AC-DC power supply module is used, low-cost and low-power consumption devices such as a singlechip and a relay can convert commercial power alternating current into 12V or 5V direct current to supply power to the outside, 55 instructions are required to be sent out at regular time through a 458 interface during power supply, otherwise, the singlechip can control the relay to cut off power for 3s to an external circuit so as to reset the external circuit, the AC-DC power supply module is an integrated module, the safety and the stability are better, 100-200Vac alternating current can be input, and most commercial power requirements are met;

the SCM system selects STC series 8-pin SCM, has low cost, good stability, no need of external crystal oscillator, simple external circuit, and can send a dog feeding instruction to the SCM at regular time through a serial port, and can control the relay through IO so as to control the on-off of power supply of the external circuit;

wherein U6 is a singlechip which is used for controlling the relay and receiving serial port instructions; an RC circuit formed by the resistors R6 and C11 can complete the power-on automatic reset function of the singlechip; c12 is a decoupling capacitor of the singlechip and is used for reducing the ripple of the power supply of the singlechip and ensuring the normal operation of the singlechip; the UART port is used for receiving an externally transmitted instruction signal (R12 and a diode M7 which are connected in series by a serial circuit are used for preventing the external power supply to the singlechip from influencing downloading), the on-off of the 2 and 3 ends of a triode Q1 is controlled through a RELAY interface (a resistor R8 plays a current limiting role), so that the suction of a RELAY is controlled (a diode D4 is a freewheel diode and is used for protecting a RELAY coil), the RELAY is in a low level in a normal state, the RELAY is in an NC end and supplies power to the external, when the UART port does not receive an external instruction within 30 seconds, the RELAY is pulled high for 3 seconds, the external power supply is disconnected through the RELAY, and the power supply is recovered after 3 seconds, so that the function of resetting an external circuit is achieved;

the circuit can be applied to a control circuit with a serial port below 12V/3A, and in actual application, the output voltage is required to be directly supplied to an external circuit, an MCU of the external circuit is required to output a channel 485 or serial port to 485 or serial port of a power supply controller, and a 55 instruction is sent at regular time; when different voltages are needed, the voltage can be realized by adding a DC-DC power supply chip or an LDO power supply chip; the 485 interface is adopted to be in butt joint with the novel power supply controller, the power supply controller is kept to supply power to the outside through sending the instruction 55 at regular time, and when an external circuit does not have the 485 interface, the 485 interface can also be in butt joint with the serial port of the singlechip through the serial port of the TTL directly, and a 485 transceiver is not needed;

when the scheme is applied to an A7 architecture main board, the voltage required by the power supply of the main board is 12V/1A, the power can be directly supplied by 12V of a power supply controller, and a 485 interface on the A7 main board is connected to the power supply controller; the output of the AC-DC voltage transformation circuit is 12V/3A, so that the power consumption requirement of an A7 control board can be completely met; the A7 control board sends a 55 instruction to the AC-DC transformation circuit every 1s through a 485 interface (the instruction can be customized by loading software, and belongs to the prior art), when the instruction is not received for more than 30s, the AC-DC transformation circuit cuts off the power supply of the A7 control board, and the power supply is powered off, and the power supply is automatically powered on again after 3s, so that the circuit is reset and the dead halt is prevented.

Notably, are: all electrical components adopted in the scheme are commercial products, belong to the prior art, and are not repeated here, and are not repeated in the use method and the product model.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.

Claims

1. The utility model provides an AC-DC transformation circuit for mainboard, includes AC-DC conversion module, singlechip system and contact type double-circuit relay, AC-DC conversion module's input and output connect commercial power and contact type double-circuit relay respectively, singlechip system and contact type double-circuit relay signal connection, contact type double-circuit relay and singlechip system are connected with the mainboard through voltage output interface and RS485 interface respectively, its characterized in that: the singlechip system includes STC8G1K08 chip, the RST port of STC8G1K08 chip has connect in parallel capacitor C11 and resistance R6, the other end ground connection of capacitor C11, the other end connection 3.3V power of resistance R6, the VCC port of STC8G1K08 chip has connect in parallel 3.3V power and electric capacity C12, the other end ground connection of electric capacity C12, the P3.3 port of STC8G1K08 chip has connect in series resistor R8, the other end of resistor R8 is connected with triode Q1, triode Q1's projecting pole ground connection, triode Q1's collecting electrode has connect in series resistor R7, diode D4 and contact type double-way relay's No. 8 port has connect in parallel to the other end, the negative pole of diode D4 is connected with contact type double-way relay No. 1 port, the P3.1 and the P3.0 port of STC8G1K08 chip has connect in series resistor R12 and diode D7 respectively.

2. An AC-DC transformation circuit for a motherboard according to claim 1, wherein: the AC-DC conversion module adopts a packaged AD-DC power module, an SP3075 chip is further connected between the singlechip system and the RS485 interface of the main board, and a DC-DC switching power supply is further connected in series between the AC-DC conversion module and the contact type double-way relay.

3. An AC-DC transformation circuit for a motherboard according to claim 1, wherein: the contact type double relay type number is HFD4/5-S.

4. An AC-DC transformation circuit for a motherboard according to claim 2, wherein: the DC-DC switching power supply is MP1593DN.

5. An AC-DC transformation circuit for a motherboard according to claim 2, wherein: and UART_TX and UART_RX ports of the SP3075 chip are respectively connected with the other end of the resistor R12 and the cathode of the diode D7.