CN214380683U - Small plug-in power supply - Google Patents

Abstract

The utility model relates to a small-size plug-in power, including female seat of one-way plug, EMI circuit, transformer T1, IGBT pipe Q1, resistance R2, resistance R3, electric capacity C5, piezo-resistor MOV, rectifier, pi type LC wave filter, controller, female seat of one-way plug is got the electricity from the outside and is exported for the EMI circuit, one of them output series transformer T1's of EMI circuit primary side back connection IGBT pipe Q1's the C utmost point, IGBT pipe Q1's the E utmost point is through resistance R3 return another output of linking to the EMI circuit, electric capacity C1 series resistance R2 forms the branch road and connects parallelly connected piezo-resistor MOV to the cross over in IGBT pipe Q1's the C utmost point, the E utmost point, pi type LC wave filter filtering is sent into after the rectifier to transformer T1's output to pi type LC wave filter's output is as the output of power. The utility model discloses a small-size plug-in power simple structure is with low costs.

Description

Small plug-in power supply

Technical Field

The utility model relates to a small-size plug-in power.

Background

Small power supplies are often used to supply power to electronic components requiring less power for precision devices (e.g., computers), and generally require a cost control due to environmental considerations.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a small-size plug-in power of simple structure with low costs.

The small plug-in power supply comprises a one-way plug female seat, an EMI circuit, a transformer T1, an IGBT tube Q1, a resistor R2, a resistor R3, a capacitor C5, a piezoresistor MOV, a rectifier, a pi-type LC filter and a controller, wherein the one-way plug female seat takes electricity from the outside and outputs the electricity to the EMI circuit, one output end of the EMI circuit is connected with the C pole of the IGBT tube Q1 after being connected with the primary side of the transformer T1 in series, the E pole of the IGBT tube Q1 is connected to the other output end of the EMI circuit through the resistor R3 in a return mode, a branch formed by the capacitor C1 in series with the resistor R2 is connected with the piezoresistor MOV in parallel and is connected with the C pole and the E pole of the IGBT tube Q1 in a bridge mode, and the output end of the transformer T1 is rectified by the rectifier and then sent to the pi-type LC filter for filtering, and the output of the pi-type LC filter is used as the output of the power supply.

Furthermore, the rated voltage of the IGBT Q1 is 4500V, and the rated current is 1500A.

Further, the EMI circuit includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a common mode inductor L1, a common mode inductor L2, a capacitor C1, a capacitor C2, a capacitor C3, and a capacitor C4, where the capacitor C1 is connected across two output ends of the unidirectional plug female socket, one output end of the unidirectional plug female socket is connected in series with the common mode inductor L1 and then connected to a primary side of the transformer T1, the other output end of the unidirectional plug female socket is connected in series with the common mode inductor L2 and then connected to the resistor R3, one end of the capacitor C2 is connected to a connection point between the common mode inductor L1 and the primary side, the other end of the capacitor C3 and the capacitor C4 are connected in series to form a branch, which is connected in parallel to two ends of the capacitor C2, and a connection point between the capacitor C3 and the capacitor C4 is grounded.

Further, the inductor comprises a resistor R1, and the common mode inductor L1 is connected to the primary side of the transformer T1 through a resistor R1.

Further, the rectifier is a unidirectional bridge rectifier circuit.

Has the advantages that:

the utility model utilizes IGBT tube Q1 to carry out chopping voltage regulation, the control is realized by a single IGBT tube, the rated voltage of IGBT tube Q1 is 4500V, the rated current is 1500A, which is enough to bear the load of the commercial power, and simultaneously, the circuit is simplified, and the cost is reduced; by arranging the pi-type LC filter at the output end, the output filtering is realized, and the output of the circuit presents low impedance, so that an impedance adjusting device is additionally arranged, and the cost is further reduced. Because the chopping core depends on a single tube, the resistor R2, the capacitor C5 and the piezoresistor MOV are arranged to protect the IGBT tube, when the IGBT tube works, after the IGBT tube receives a turn-off signal, the IGBT tube is rapidly turned off, the current flowing through the IGBT tube is forcibly transferred to an RC loop consisting of the capacitor C5 and the resistor R2, the voltage of the RC loop rapidly rises, the piezoresistor MOV is turned on to a certain degree, redundant energy is discharged, voltage is clamped, and the IGBT is protected.

Drawings

The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.

Fig. 1 is a circuit diagram of a small plug-in power supply of the present invention.

Detailed Description

The invention will be further described with reference to the following examples.

As shown in fig. 1, the utility model discloses a small-size plug-in power supply, including female seat of one-way plug, EMI circuit, transformer T1, IGBT pipe Q1, resistance R2, resistance R3, electric capacity C5, piezo-resistor MOV, rectifier, pi type LC wave filter, controller. The one-way plug female seat is used for taking power from a mains supply and outputting the power to an EMI circuit, one output end of the EMI circuit is connected with the C pole of an IGBT tube Q1 after being connected with the primary side of a transformer T1 in series, the E pole of the IGBT tube Q1 is connected to the other output end of the EMI circuit through a resistor R3 in return, a branch formed by a capacitor C1 series resistor R2 is connected with a piezoresistor MOV in parallel and bridged to the C pole and the E pole of an IGBT tube Q1, the output end of the transformer T1 is rectified by a rectifier and then sent to a pi-type LC filter for filtering, and the output of the pi-type LC filter is used as the output of a power supply.

When the power supply device works, the one-way plug female seat is powered by mains supply, alternating current is input through an EMI circuit and subjected to common mode filtering to remove high-frequency burrs, the alternating current is transmitted to the primary side of a transformer T1, a controller outputs PWM to control the opening and closing of an IGBT tube Q1, PWM waveforms with different duty ratios are output by utilizing a chopping voltage regulation principle to control the magnitude of secondary side output voltage of the transformer T1, the output voltage is converted into direct current through a rectifier rectifying current, a pi-type LC filter is used for output filtering, meanwhile, the insertion loss is reduced by the pi-type LC filter, and the output of the circuit is low in impedance. In the circuit, a resistor R3 is used for power control.

In the circuit, chopping and voltage regulation are carried out by using the IGBT tube Q1, the control is realized by a single IGBT tube, the rated voltage of the IGBT tube Q1 is 4500V, the rated current is 1500A, the load of the mains supply power can be borne, the circuit is simplified, and the cost is reduced; by arranging the pi-type LC filter at the output end, the output filtering is realized, and the output of the circuit presents low impedance, so that an impedance adjusting device is additionally arranged, and the cost is further reduced. Because the chopping core depends on a single tube, the resistor R2, the capacitor C5 and the piezoresistor MOV are arranged to protect the IGBT tube, when the IGBT tube works, after the IGBT tube receives a turn-off signal, the IGBT tube is rapidly turned off, the current flowing through the IGBT tube is forcibly transferred to an RC loop consisting of the capacitor C5 and the resistor R2, the voltage of the RC loop rapidly rises, the piezoresistor MOV is turned on to a certain degree, redundant energy is discharged, voltage is clamped, and the IGBT is protected.

The utility model discloses in, the EMI circuit comprises electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, common mode inductance L1, common mode inductance L2, and wherein electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4 four's appearance value is the same. When the unidirectional plug is connected, the capacitor C1 is bridged between two output ends of the unidirectional plug female seat, one output end of the unidirectional plug female seat is connected with the common-mode inductor L1 in series and then connected to the primary side of the transformer T1, the other output end of the unidirectional plug female seat is connected with the resistor R3 in series and then connected with the common-mode inductor L2, one end of the capacitor C2 is connected with a connection point between the common-mode inductor L1 and the primary side, the other end of the capacitor C2 is connected with a connection point between the common-mode inductor L2 and the resistor R3, a branch formed by mutually connecting the capacitor C3 and the capacitor C4 in series is connected with two ends of the capacitor C2 in parallel, and the connection point between the capacitor C3 and the capacitor C4 is grounded. The EMI circuit with the structure has a simplified circuit structure, can realize common-mode filtering with certain requirements, and is enough to deal with scenes with low power consumption requirements.

Furthermore, the circuit is also provided with a resistor R1, the common mode inductor L1 is connected to the primary side of the transformer T1 through a resistor R1, and the input power of the transformer is controlled through a resistor R1.

Furthermore, the rectifier is selected as a unidirectional bridge rectifier circuit, and the highest back voltage borne by each rectifier is only that of the secondary side output voltage

And meanwhile, the voltage loss after rectification by the unidirectional bridge rectifier circuit is lower than 10 percent, and the post-stage output power can be provided as much as possible.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (5)

1. A small-size plug-in power supply which characterized in that: the power supply comprises a one-way plug female seat, an EMI circuit, a transformer T1, an IGBT tube Q1, a resistor R2, a resistor R3, a capacitor C5, a piezoresistor MOV, a rectifier, a pi-type LC filter and a controller, wherein the one-way plug female seat takes electricity from the outside and outputs the electricity to the EMI circuit, one output end of the EMI circuit is connected with the C pole of the IGBT tube Q1 after being connected with the primary side of the transformer T1 in series, the E pole of the IGBT tube Q1 is connected back to the other output end of the EMI circuit through the resistor R3, a branch formed by the capacitor C1 and the resistor R2 is connected with the piezoresistor MOV in parallel and is connected with the C pole and the E pole of the IGBT tube Q1 in a bridging manner, and the output end of the transformer T1 is rectified by the rectifier and then sent to the pi-type LC filter for filtering, and the output of the pi-type LC filter is used as the output of a power supply.

2. The small-sized plug-in power supply of claim 1, wherein the EMI circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a common mode inductor L1, a common mode inductor L2, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, the capacitance C1 is connected across two output ends of the unidirectional plug female base, one output end of the unidirectional plug female base is connected in series with the common mode inductor L1 and then connected to the primary side of the transformer T1, the other output end of the unidirectional plug female base is connected in series with the common mode inductor L2 and then connected with the resistor R3, one end of the capacitor C2 is connected with a connection point between the common mode inductor L1 and the primary side, the other end of the capacitor C3 and a connection point between the common mode inductor L2 and the resistor R3, a branch formed by connecting the capacitors C4 in series is connected in parallel with two ends of the capacitor C2, and a connection point between the capacitor C3 and the capacitor C4 is grounded.

3. The small form factor pluggable power supply of claim 2, further comprising a resistor R1, wherein the common mode inductor L1 is connected to the primary side of the transformer T1 via a resistor R1.

4. The miniature plug-in power supply of claim 1, wherein said rectifier is a unidirectional bridge rectifier circuit.

5. The small plug-in power supply according to claim 1, wherein the rated voltage of the IGBT tube Q1 is 4500V, and the rated current is 1500A.

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