Multi-path power supply power supply output conversion circuit

Abstract

The utility model relates to a 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 and a fan PWM 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 reduce reactive power consumption, reduce current distortion and 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 multi-path DC-DC conversion circuit is used for carrying out voltage conversion and then outputting; the power output conversion circuit can supply power to the power utilization ends with different voltage requirements at the same time.

Description

Technical Field

[0001] The utility model belongs to the field of power supply, and particularly relates to a power output conversion circuit for multi-channel power supply. Background Art

[0002] In the prior art, many power output terminals cannot supply power to multiple electrical devices simultaneously; although a certain power supply device can achieve multi-channel power supply, it often cannot meet the power supply voltage requirements of devices with different power consumption. Common DC voltages required at the power consumption end include 5V, 12V, 24V, 48V, etc., and common electrical devices include readers, displays, sensors, etc. Therefore, it is particularly important to design a power output conversion circuit for the power supply end that can meet multi-channel different power consumption requirements. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a power output conversion circuit for multi-channel power supply.

[0004] A power output conversion circuit for multi-channel power supply includes: an EMC filtering circuit, a rectifying circuit, a PFC circuit, a plurality of DC-DC conversion circuits, an auxiliary power supply circuit, a relay circuit, a CPU control circuit, and a fan PWM control circuit; wherein, the AC input (220V) is electrically connected to the input end of the EMC filtering circuit, the output end of the EMC filtering circuit is electrically connected to the input end of the rectifying circuit, the output end of the rectifying 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 filtering circuit, the rectifying circuit, the PFC circuit, the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit, and the fan PWM control circuit; the relay circuit, the auxiliary power supply circuit, and the fan PWM control circuit are all electrically connected to the DC-DC conversion circuit;

[0005] The CPU control circuit is used to send control signals to the EMC filtering circuit, the rectifying circuit, the PFC circuit, the DC-DC conversion circuit, the auxiliary power supply circuit, the relay circuit, and the fan PWM control circuit;

[0006] The EMC filtering circuit is used to receive the control signal of the CPU control circuit and reduce the common mode interference in the AC input;

[0007] The rectifying circuit is used to receive the control signal of the CPU control circuit and receive the AC input processed by the EMC filtering circuit, remove the high-frequency noise in the AC signal, and convert the AC signal with the high-frequency noise removed into a DC signal;

[0008] A PFC circuit, which is used to receive the control signal from the CPU control circuit and the DC signal sent by the rectifier circuit, improve the power factor in the DC signal, reduce the reactive power consumption, reduce the current distortion, and improve the influence of the load on the power grid in the power system;

[0009] An auxiliary power supply circuit, which is used to receive the control signal from the CPU control circuit and the DC voltage with adjusted power factor sent by the PFC circuit, and is used for rectifying the current of the DC voltage and output distribution;

[0010] A relay circuit, which is used to receive the control signal from the CPU control circuit, remotely control the on / off of multiple DC-DC conversion circuits, and realize multi-path selection;

[0011] A fan PWM control circuit, which is used to receive the control signal from the CPU control circuit and is used for voltage / current regulation of the multi-path outputs distributed by the auxiliary power supply circuit;

[0012] Multiple DC-DC conversion circuits, which are used to receive the control signal from the CPU control circuit, receive the DC voltage after voltage / current regulation by the fan PWM control circuit, and output after voltage conversion.

[0013] Preferably: A lightning protection circuit is also electrically connected between the EMC filter circuit and the AC input, which is used to improve the safety.

[0014] Preferably: An over-voltage and under-voltage protection circuit is also electrically connected between the EMC filter circuit and the rectifier circuit, which is used for over-voltage protection and under-voltage protection of the circuit, preventing the electronic device or circuit from being damaged by too high voltage, or preventing the device from being damaged or malfunctioning due to the input voltage being lower than the predetermined threshold.

[0015] Preferably: An EMC filter circuit is also electrically connected to the output side of the DC-DC conversion circuit, which is used to reduce the differential mode interference between the electronic devices electrically connected to the multiple power supply ports of the power output conversion circuit.

[0016] Preferably: The CPU control circuit is also electrically connected to an over-temperature protection circuit, and the over-temperature protection circuit is electrically connected to the input side of the multiple DC-DC conversion circuits, which is used to disconnect the multiple DC-DC conversion circuits when the temperature of the entire circuit exceeds the preset value, prevent the circuit temperature from being too high, perform power-off protection on the entire circuit when the temperature exceeds the set value to protect the CPU control circuit, and control the normal operation of the remaining current.

[0017] The beneficial effect of the present utility model is: The power output conversion circuit designed by the present utility model can simultaneously supply power to the power consumption terminals with different voltage requirements (such as 5V, 12V, 24V, and 48V DC voltages).

[0018] The utility model includes: an EMC filter circuit for reducing common-mode interference in AC input; a rectifier circuit for removing high-frequency noise in the AC signal and converting the AC signal with removed high-frequency noise into a DC signal; a PFC circuit for improving the power factor in the DC signal, reducing reactive power consumption, reducing current distortion, and improving the influence of the load on the power grid in the power system; an auxiliary power supply circuit for rectifying and outputting the current of the DC voltage; a relay circuit for remotely controlling the on / off of multiple DC-DC conversion circuits to achieve multi-path selection; a fan PWM control circuit for adjusting the voltage / current of the multi-path output distributed by the auxiliary power supply circuit; and a multi-path DC-DC conversion circuit for outputting after voltage conversion. Description of the Drawings

[0019] Figure 1 is the circuit framework diagram of the utility model;

[0020] Figure 2 is the circuit schematic diagram of the relay circuit and over-temperature protection circuit of the utility model;

[0021] Figure 3 is the circuit schematic diagram of the EMC filter circuit, rectifier circuit and DC-DC conversion circuit of the utility model;

[0022] Figure 4 is the circuit schematic diagram of the PFC circuit and auxiliary power supply circuit of the utility model;

[0023] Figure 5 is the circuit schematic diagram of the CPU control circuit and fan PWM control circuit of the utility model. Detailed Embodiments

[0024] The following further describes the utility model in conjunction with embodiments. The description of the following embodiments is only for helping to understand the utility model. It should be noted that for ordinary persons in the technical field, without departing from the principle of the utility model, several modifications can still be made to the utility model, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

[0025] As an embodiment, as Figure 1As shown, a power output conversion circuit with multiple power supplies includes: an EMC filter circuit, a lightning protection circuit (for enhancing safety), a rectifier circuit, a PFC circuit, multiple DC-DC conversion circuits, an auxiliary power supply circuit, a relay circuit, a CPU control circuit, and a fan PWM 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 circuits, 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 circuits, the auxiliary power supply circuit, the relay circuit, and the fan PWM control circuit; the relay circuit, the auxiliary power supply circuit, and the fan PWM control circuit are all electrically connected to the DC-DC conversion circuits; an over-voltage and under-voltage protection circuit is also electrically connected between the EMC filter circuit and the rectifier circuit, which is used to perform over-voltage protection and under-voltage protection on the circuit, prevent electronic devices or circuits from being damaged by excessive voltage, or prevent device damage or abnormal operation caused by the input voltage being lower than a predetermined threshold;

[0026] As Figure 5 shown, 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 circuits, the auxiliary power supply circuit, the relay circuit, and the fan PWM control circuit; As Figure 5 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, and the electrochemical sensor EC7 is used to detect current / voltage changes, and this RC circuit is used to stabilize the output of the electrochemical sensor EC7; resistors R25, R30, and R29, and capacitor C11 form an RC filter circuit, and this RC filter circuit is used to filter out signals of specific frequencies and leave signals of the required frequencies. R33 is a current limiting resistor, and capacitor C18 is used to smooth voltage fluctuations and quickly eliminate transient changes;

[0027] The EMC filter circuit is used to receive the control signal of the CPU control circuit and reduce the common-mode interference in the AC input;

[0028] As Figure 3As shown in the figure, 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 the high-frequency noise in the AC signal, and convert the AC signal with high-frequency noise removed into a DC signal. Diode D48 only allows current to flow in one direction, that is, the so-called forward-biased state. Capacitor C65 is used to filter out the AC component and retain the DC component. Resistor R116 is used to limit the maximum current flowing through the diode or provide some damping to reduce the oscillation in the circuit.

[0029] As Figure 4 shown in the figure, the PFC circuit is used to receive the control signal from the CPU control circuit and the DC signal sent by the rectifier circuit, improve the power factor in the DC signal, reduce the reactive power consumption, reduce the current distortion, and improve the influence of the load on the power grid in the power system.

[0030] As Figure 4 shown in the figure, the auxiliary power supply circuit is used to receive the control signal from the CPU control circuit and the DC voltage with power factor adjusted sent by the PFC circuit, and is used for rectifying and output distribution of 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.

[0031] As Figure 2 shown in the figure, the relay circuit is used to receive the control signal from the CPU control circuit, remotely control the on / off of multiple DC-DC conversion circuits, and achieve multi-way selection.

[0032] As Figure 5 shown in the figure, the fan PWM control circuit is used to receive the control signal from the CPU control circuit and is used for voltage / current regulation of the multi-way output distributed by the auxiliary power supply circuit.

[0033] As Figure 3 shown in the figure, the multi-way DC-DC conversion circuit is used to receive the control signal from the CPU control circuit, receive the DC voltage regulated by the fan PWM control circuit in terms of voltage / current, and output after voltage conversion. Diode D13 is used to prevent reverse voltage.

[0034] As Figure 3 shown in the figure, the output side of the EDC-DC conversion circuit is also electrically connected to an EMC filter circuit, which is used to reduce the differential-mode interference between the electronic devices electrically connected to multiple power supply ports of the power output conversion circuit. Figure 3 The inductor L3 in it is used for energy storage and filtering. As Figure 2As shown, the CPU control circuit is also electrically connected to an over-temperature protection circuit. The over-temperature protection circuit 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, so as to prevent the circuit temperature from being too high, and is used to cut off the power supply of the entire circuit to protect the CPU control circuit when the temperature exceeds the set value, and is used to control the normal operation of the remaining current.

Claims

1. A power output conversion circuit with multiple power supplies, characterized in that Including: EMC filter circuit, rectifier circuit, PFC circuit, multiple DC-DC conversion circuits, auxiliary power supply circuit, relay circuit, CPU control circuit, and fan PWM control circuit; 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 circuits, auxiliary power supply circuit, relay circuit, and fan PWM control circuit; the CPU control circuit is electrically connected to the EMC filter circuit, rectifier circuit, PFC circuit, DC-DC conversion circuits, auxiliary power supply circuit, relay circuit, and fan PWM control circuit; the relay circuit, auxiliary power supply circuit, and fan PWM control circuit are all electrically connected to the DC-DC conversion circuits; The CPU control circuit is used to send control signals to the EMC filter circuit, rectifier circuit, PFC circuit, DC-DC conversion circuits, auxiliary power supply circuit, relay circuit, and fan PWM control circuit; The EMC filter circuit is used to receive the control signal of the CPU control circuit and reduce the common-mode interference in the AC input; The rectifier circuit is used to receive the control signal of the CPU control circuit and the AC input processed by the EMC filter circuit, remove the high-frequency noise in the AC signal, and convert the AC signal with high-frequency noise removed into a DC signal; The PFC circuit is used to receive the control signal of the CPU control circuit and the DC signal sent by the rectifier circuit to improve the power factor in the DC signal; The auxiliary power supply circuit is used to receive the control signal of the CPU control circuit and the DC voltage with power factor adjusted sent by the PFC circuit, and is used for rectifying and output distribution of the current of the DC voltage; The relay circuit is used to receive the control signal of the CPU control circuit and remotely control the on / 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 is used for voltage / current regulation of the multiple outputs distributed by the auxiliary power supply circuit; The multiple DC-DC conversion circuits are used to receive the control signal of the CPU control circuit, receive the DC voltage regulated by the fan PWM control circuit in terms of voltage / current, and output after voltage conversion.

2. The power output conversion circuit with multiple power supplies according to claim 1, wherein: A lightning protection circuit is also electrically connected between the EMC filter circuit and the AC input.

3. The power output conversion circuit with multiple power supplies according to claim 2, wherein: An over-voltage and under-voltage protection circuit is also electrically connected between the EMC filter circuit and the rectifier circuit.

4. The power output conversion circuit with multiple power supplies according to claim 3, wherein: An EMC filter circuit is also electrically connected to the output side of the DC-DC conversion circuits.

5. The power output conversion circuit with multiple power supplies according to claim 4, characterized in that: The CPU control circuit is also electrically connected to an over-temperature protection circuit, and the over-temperature protection circuit is electrically connected to the input side of the multiple DC-DC conversion circuits, and is used to disconnect the multiple DC-DC conversion circuits when the temperature of the entire circuit exceeds the preset value.

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