Independent turn-off or turn-on multi-path power supply power supply output conversion circuit

Abstract

The utility model relates to an independently switched-off or switched-on multipath power supply power supply output conversion circuit comprising an EMC filter circuit, a rectification circuit, a PFC circuit, a plurality of DC-DC conversion circuits, an auxiliary power supply circuit, a relay circuit, a CPU control circuit, a fan PWM control circuit and a multipath on-off control circuit. The beneficial effects of the utility model are that the EMC filter circuit can reduce common-mode interference in AC input; the rectifying circuit can remove high-frequency noise and convert an alternating-current signal into a direct-current signal; the PFC circuit can improve the influence of a load on a power grid in a power system; the auxiliary power supply circuit is used for carrying out rectification and output distribution on the current of the direct-current voltage; the relay circuit is used for realizing multi-path selection; the fan PWM control circuit is used for carrying out voltage / current regulation on the multi-path output distributed by the auxiliary power supply circuit; the DC-DC conversion circuit is used for carrying out voltage conversion and then outputting; power can be supplied to power utilization ends with different voltage requirements at the same time, and each path of power supply can be turned off or turned on independently.

Description

Technical Field

[0001] The utility model belongs to the field of power supply, and in particular relates to a multi-channel power supply output conversion circuit that can be independently turned off or on. Background Art

[0002] In the existing technology, many power output terminals are unable to supply power to multiple electrical devices at the same time; although a certain power supply device can provide multi-channel power supply, it often cannot meet the power supply voltage requirements of devices with different power consumption. Common power consumption terminals require DC voltages such as 5V, 12V, 24V and 48V. Common power consumption devices include readers, displays, sensors, etc.

[0003] In addition, for energy-saving considerations, terminal devices need to use power supply circuits that can be independently turned on and off when in use, so that each terminal device can work independently without being affected by the working status of other devices. Therefore, it is particularly important to design a multi-channel power supply output conversion circuit that can be independently turned off or on. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a multi-channel power supply output conversion circuit that can be independently turned off or on.

[0005] A power output conversion circuit for independently shutting down or starting multiple power supplies comprises: an EMC filter circuit, a rectifier circuit, a PFC circuit, multiple DC-DC conversion circuits, an auxiliary power supply circuit, a relay circuit, a CPU control circuit, a fan PWM control circuit, and multiple on-off control circuits; wherein the AC input is electrically connected to the input end of the EMC filter circuit, the output end of the EMC filter circuit is electrically connected to the input end of the rectifier circuit, the output end of the rectifier circuit is electrically connected to the input end of the PFC circuit, and the PFC circuit is also electrically connected to the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit, and the fan PWM control circuit; the CPU control circuit is electrically connected to the EMC filter circuit, the rectifier circuit, the PFC circuit, the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit, the fan PWM control circuit, the on-off control circuit, and the industrial computer; the relay circuit, the auxiliary power supply circuit, and the fan PWM control circuit are all electrically connected to the DC-DC conversion circuit; and the input end of each DC-DC conversion circuit is electrically connected to an on-off control circuit.

[0006] The CPU control circuit is used to send control signals to the EMC filter circuit, the rectifier circuit, the PFC circuit, the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit and the fan PWM control circuit;

[0007] EMC filter circuit, used to receive control signals from the CPU control circuit and reduce common-mode interference in the AC input;

[0008] a rectifier circuit for receiving a control signal from the CPU control circuit and an AC input processed by the EMC filter circuit, removing high-frequency noise from the AC signal, and converting the AC signal from which the high-frequency noise has been removed into a DC signal;

[0009] The PFC circuit is used to receive the control signal from the CPU control circuit and the DC signal from the rectifier circuit, improve the power factor in the DC signal, reduce reactive power consumption, reduce current distortion, and improve the impact of the load on the power grid in the power system;

[0010] An auxiliary power supply circuit is used to receive the control signal from the CPU control circuit and the power factor adjusted DC voltage from the PFC circuit, and is used to rectify and output the current of the DC voltage;

[0011] The relay circuit is used to receive the control signal of the CPU control circuit, remotely control the on and off of multiple DC-DC conversion circuits, and realize multi-path selection;

[0012] The fan PWM control circuit is used to receive the control signal of the CPU control circuit and to adjust the voltage / current of the multiple outputs distributed by the auxiliary power supply circuit;

[0013] A multi-channel DC-DC conversion circuit is used to receive control signals from the CPU control circuit, receive DC voltage after voltage / current adjustment by the fan PWM control circuit, and output it after voltage conversion;

[0014] The on-off control circuit is used to receive the control signal sent by the CPU control circuit according to the instruction issued by the industrial computer, and is used to control the opening or closing of the DC-DC conversion circuit corresponding to the on-off control circuit.

[0015] Preferably, a lightning protection circuit is electrically connected between the EMC filter circuit and the AC input to improve safety.

[0016] Preferably, an overvoltage and undervoltage protection circuit is electrically connected between the EMC filter circuit and the rectifier circuit to provide overvoltage and undervoltage protection to the circuit, thereby preventing electronic equipment or circuits from being damaged by excessive voltage, or preventing equipment from being damaged or malfunctioning due to an input voltage lower than a predetermined threshold.

[0017] Preferably, the output side of the DC-DC conversion circuit is further electrically connected to an EMC filter circuit for reducing differential mode interference between electronic devices electrically connected to the multiple power supply ports of the power output conversion circuit.

[0018] Preferably, the CPU control circuit is further electrically connected to an over-temperature protection circuit, which is electrically connected to the input side of the multi-channel DC-DC conversion circuit and is used to disconnect the multi-channel DC-DC conversion circuit when the temperature of the entire circuit exceeds a preset value, thereby preventing the circuit temperature from being too high and powering off the entire circuit to protect the CPU control circuit when the temperature exceeds the set value, thereby controlling the normal operation of the remaining current.

[0019] The beneficial effects of the present invention are as follows: the power output conversion circuit designed by the present invention is equipped with a corresponding industrial computer, which can simultaneously supply power to power terminals with different voltage requirements (for example, 5V, 12V, 24V and 48V DC voltages); as long as the industrial computer gives a control signal, the power supply line to be shut down can be shut down, while the remaining power supply lines are not affected by the shutdown of the line because they work independently.

[0020] The utility model includes: an EMC filter circuit for reducing common-mode interference in AC input; a rectifier circuit for removing high-frequency noise from AC signals and converting the AC signals with high-frequency noise removed into DC signals; a PFC circuit for improving the power factor in DC signals, reducing reactive power consumption, lowering current distortion, and improving the impact of loads on the power grid in the power system; an auxiliary power supply circuit for rectifying and outputting the current of DC voltage; a relay circuit for remotely controlling the on / off of multiple DC-DC conversion circuits to achieve multi-channel selection; a fan PWM control circuit for performing voltage / current regulation on the multiple outputs distributed by the auxiliary power supply circuits; and multiple DC-DC conversion circuits for performing voltage conversion and output. Each DC-DC conversion circuit is provided with an on / off control circuit for controlling the on / off of the DC-DC conversion circuit corresponding to the on / off control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a circuit framework diagram of the utility model;

[0022] Figure 2 This is a circuit schematic diagram of the relay circuit and over-temperature protection circuit of the utility model;

[0023] Figure 3 This is a circuit schematic diagram of the EMC filter circuit, rectifier circuit and DC-DC conversion circuit of the utility model;

[0024] Figure 4 This is a circuit schematic diagram of the PFC circuit and auxiliary power supply circuit of the utility model;

[0025] Figure 5 This is a circuit schematic diagram of the CPU control circuit and the fan PWM control circuit of the present utility model. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the following embodiments. The following embodiments are provided solely to facilitate understanding of the present invention. It should be noted that, within the scope of the present invention, modifications may be made by a person skilled in the art without departing from the principles of the present invention. Such improvements and modifications are also within the scope of the claims of the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, a multi-channel power supply output conversion circuit that can be independently turned off or on is provided with a corresponding industrial computer, including: an EMC filter circuit, a lightning protection circuit (for improving safety), a rectifier circuit, a PFC circuit, multiple DC-DC conversion circuits, an auxiliary power supply circuit, a relay circuit, a CPU control circuit, a fan PWM control circuit, and a multi-channel on-off control circuit; wherein the AC input (220V) is electrically connected to the input end of the EMC filter circuit, the output end of the EMC filter circuit is electrically connected to the input end of the lightning protection circuit, the output end of the lightning protection circuit is electrically connected to the input end of the rectifier circuit, the output end of the rectifier circuit is electrically connected to the input end of the PFC circuit, and the PFC circuit is also electrically connected to the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit, and the fan PWM control circuit; The CPU control circuit is electrically connected to the EMC filter circuit, the rectifier circuit, the PFC circuit, the DC-DC converter circuit, the auxiliary power supply circuit, the relay circuit, the fan PWM control circuit, the on-off control circuit, and the industrial computer; the relay circuit, the auxiliary power supply circuit, and the fan PWM control circuit are all electrically connected to the DC-DC converter circuit; the input end of each DC-DC converter circuit is electrically connected to an on-off control circuit; if a shared DC-DC converter circuit is used, the efficiency is relatively low; an overvoltage and undervoltage protection circuit is also electrically connected between the EMC filter circuit and the rectifier circuit, for providing overvoltage and undervoltage protection to the circuit, preventing damage to electronic equipment or circuits from excessive voltage, or preventing damage to the equipment or malfunction due to input voltage being lower than a predetermined threshold;

[0029] like Figure 5 As shown, the CPU control circuit is used to receive instructions from the industrial computer and send control signals to the EMC filter circuit, rectifier circuit, PFC circuit, DC-DC conversion circuit, auxiliary power supply circuit, relay circuit, fan PWM control circuit and on-off control circuit; Figure 5As shown, CS2, CS3, and CS5 form a current sensing circuit; diode D25 is used for rectification / protection; capacitor C15 and resistor R129 are used for preliminary filtering and current limiting of the high-voltage input; resistor R127 and capacitor C54 form an RC circuit. Electrochemical sensor EC7 is used to detect changes in current / voltage. This RC circuit is used to stabilize the output of electrochemical sensor EC7; resistors R25, R30, and R29, as well as capacitor C11, form an RC filter circuit. This RC filter circuit is used to filter out signals of specific frequencies, leaving only signals of the desired frequency. R33 is a current-limiting resistor, and capacitor C18 is used to smooth voltage fluctuations and quickly eliminate transient changes.

[0030] EMC filter circuit, used to receive control signals from the CPU control circuit and reduce common-mode interference in the AC input;

[0031] like Figure 3 As shown, the rectifier circuit receives control signals from the CPU control circuit and AC input processed by the EMC filter circuit, removes high-frequency noise from the AC signal, and converts the de-noised AC signal into a DC signal. Diode D48 allows current to flow in only one direction, which is the so-called forward bias state. Capacitor C65 filters out the AC component and retains the DC component. Resistor R116 limits the maximum current flowing through the diode or provides some damping to reduce circuit oscillations.

[0032] like Figure 4 As shown, the PFC circuit is used to receive the control signal from the CPU control circuit and the DC signal from the rectifier circuit, improve the power factor in the DC signal, reduce reactive power consumption, reduce current distortion, and improve the impact of the load on the power grid in the power system;

[0033] like Figure 4 As shown, the auxiliary power supply circuit is used to receive the control signal of the CPU control circuit and the power factor adjusted DC voltage sent by the PFC circuit, and is used to rectify and output the current of the DC voltage; the auxiliary power supply circuit includes an oscillator circuit, a power distribution circuit, and a voltage conversion circuit / voltage regulation circuit;

[0034] like Figure 2 As shown, the relay circuit is used to receive the control signal of the CPU control circuit, remotely control the on and off of multiple DC-DC conversion circuits, and realize multi-path selection;

[0035] like Figure 5 As shown, the fan PWM control circuit is used to receive the control signal of the CPU control circuit and to adjust the voltage / current of the multiple outputs distributed by the auxiliary power supply circuit;

[0036] like Figure 3As shown, the multi-channel DC-DC conversion circuit is used to receive the control signal of the CPU control circuit, and is used to receive the DC voltage after voltage / current adjustment by the fan PWM control circuit, and output it after voltage conversion; the diode D13 is used to prevent reverse voltage;

[0037] like Figure 1 As shown, the on-off control circuit is used to receive the control signal issued by the CPU control circuit according to the instruction issued by the industrial computer, and is used to control the opening or closing of the DC-DC conversion circuit corresponding to the on-off control circuit;

[0038] like Figure 3 As shown, the output side of the EDC-DC conversion circuit is also electrically connected to an EMC filter circuit for reducing differential mode interference between electronic devices electrically connected to multiple power supply ports of the power output conversion circuit. Figure 3 The inductor L3 is used for energy storage and filtering. Figure 2 As shown, the CPU control circuit is also electrically connected to an over-temperature protection circuit, which is electrically connected to the input side of the multi-channel DC-DC conversion circuit and is used to disconnect the multi-channel DC-DC conversion circuit when the temperature of the entire circuit exceeds a preset value, thereby preventing the circuit temperature from being too high and powering off the entire circuit to protect the CPU control circuit when the temperature exceeds the set value, thereby controlling the normal operation of the remaining current.

[0039] Example 2

[0040] On the basis of Example 1, 9 DC-DC conversion circuits are provided, and the on-off control circuits for turning on or off the DC-DC conversion circuits are also provided with 9 circuits. Figure 1 It can be seen that the present invention can provide four types of power supply outputs, namely 24V / 12A DC output, 12V / 8A DC output, 5V / 8A DC output and 5V SB / 3A DC output.

Claims

1. A power output conversion circuit for multiple power supplies that can be independently turned off or on, equipped with a corresponding industrial computer, characterized in that: include: EMC filter circuit, rectifier circuit, PFC circuit, multiple DC-DC conversion circuits, auxiliary power supply circuit, relay circuit, CPU control circuit, fan PWM control circuit and multiple on-off control circuits; wherein, the AC input is electrically connected to the input end of the EMC filter circuit, the output end of the EMC filter circuit is electrically connected to the input end of the rectifier circuit, the output end of the rectifier circuit is electrically connected to the input end of the PFC circuit, and the PFC circuit is also electrically connected to the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit and the fan PWM control circuit; the CPU control circuit is electrically connected to the EMC filter circuit, the rectifier circuit, the PFC circuit, the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit, the fan PWM control circuit, the on-off control circuit and the industrial computer; the relay circuit, the auxiliary power supply circuit and the fan PWM control circuit are all electrically connected to the DC-DC conversion circuit; the input end of each DC-DC conversion circuit is electrically connected to an on-off control circuit; The CPU control circuit is used to receive instructions from the industrial computer and send control signals to the EMC filter circuit, rectifier circuit, PFC circuit, DC-DC conversion circuit, auxiliary power supply circuit, relay circuit, fan PWM control circuit and on-off control circuit; EMC filter circuit, used to receive control signals from the CPU control circuit and reduce common-mode interference in the AC input; The rectifier circuit is used to receive the control signal from the CPU control circuit and the AC input processed by the EMC filter circuit, remove high-frequency noise from the AC signal, and convert the AC signal with high-frequency noise removed into a DC signal; A PFC circuit is used to receive a control signal from the CPU control circuit and a DC signal from the rectifier circuit, and to improve the power factor of the DC signal; An auxiliary power supply circuit is used to receive the control signal from the CPU control circuit and the power factor adjusted DC voltage from the PFC circuit, and is used to rectify and output the current of the DC voltage; Relay circuit, used to receive control signals from the CPU control circuit and remotely control the on and off of multiple DC-DC conversion circuits; The fan PWM control circuit is used to receive the control signal of the CPU control circuit and to adjust the voltage / current of the multiple outputs distributed by the auxiliary power supply circuit; A multi-channel DC-DC conversion circuit is used to receive control signals from the CPU control circuit, receive DC voltage after voltage / current adjustment by the fan PWM control circuit, and output it after voltage conversion; The on-off control circuit is used to receive the control signal sent by the CPU control circuit according to the instruction issued by the industrial computer, and is used to control the opening or closing of the DC-DC conversion circuit corresponding to the on-off control circuit.

2. The power output conversion circuit for multiple power supplies capable of being independently turned off or on according to claim 1, characterized in that: A lightning protection circuit is also electrically connected between the EMC filter circuit and the AC input.

3. The power output conversion circuit for multiple power supplies capable of being independently turned off or on according to claim 2, characterized in that: An overvoltage and undervoltage protection circuit is also electrically connected between the EMC filter circuit and the rectifier circuit.

4. The power output conversion circuit for multiple power supplies capable of being independently turned off or on according to claim 3, characterized in that: The output side of the DC-DC conversion circuit is also electrically connected to an EMC filter circuit.

5. The power output conversion circuit for multiple power supplies capable of being independently turned off or on according to claim 4, characterized in that: The CPU control circuit is also electrically connected to an over-temperature protection circuit, which is electrically connected to the input side of the multi-channel DC-DC conversion circuit and is used to disconnect the multi-channel DC-DC conversion circuit when the temperature of the entire circuit exceeds a preset value.

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