Wide-range power conversion module

Abstract

The utility model provides a wide-range power conversion module. The wide-range power conversion module comprises a first input conversion unit and a second input conversion unit, the input end of the first input conversion unit is connected with a transformer of external power supply equipment; the input end and the output end of the second input conversion unit are respectively connected with the output end of the first input conversion unit and the input end of the electric equipment; the boosting unit at least comprises a boosting circuit connected to the secondary side of the transformer, the boosting circuit is a PWM control circuit, and conversion of the input voltage range is achieved based on PWM control. A conversion module is formed by a boosting unit, an input EMI filtering unit, a DC / DC conversion unit, an output filtering unit and an output redundancy unit, and power conversion of high-voltage input can still be achieved under the condition that the size of the module is kept small enough; meanwhile, a winding is additionally arranged on the secondary side of the transformer, the transformation ratio of the transformer can be improved, a switching tube is additionally arranged at the connecting position of the original winding and the newly-added winding, the switching tube is connected when high voltage is input, the switching tube is disconnected when low voltage is input, and therefore wide-range input is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric energy conversion, and particularly relates to a wide-range power conversion module. BACKGROUND

[0002] PWM control technology is a control technology commonly used in the field of direct-current power conversion. The technology adopted in the application mainly breaks through in the following two applications: one is full-digital PWM redundant control, and the other is high-voltage isolation of PWM driving. The full-digital PWM redundant control mainly solves the problems of high reliability and long-time operation of the wide-range power conversion module. Through PWM redundant control, multiple configuration power management modules are operated in parallel. According to the actual application scene and the changes of the input power supply and output power supply of the power management module, the adjustment control is adaptively performed to ensure the reliable and stable operation of the product. The most commonly used PWM driving is low-voltage conversion control below DC 600V. For high-voltage conversion above DC 600V, high-voltage isolation driving is a technical difficulty. The existing PWM control DC / DC conversion circuit can only meet the voltage conversion below DC 600V. For high-voltage power conversion, a special control circuit needs to be used. In order to solve the problems existing in the prior art, the application provides a wide-range power conversion module capable of stably converting high-voltage input. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the main purpose of the application is to provide a wide-range power conversion module.

[0004] The technical scheme adopted by the application is as follows: a wide-range power conversion module, the power conversion module comprising a first input conversion unit and a second input conversion unit;

[0005] The input end of the first input conversion unit is connected with the transformer of an external power supply device, and is used for increasing the conversion range of the input voltage.

[0006] The input end and the output end of the second input conversion unit are respectively connected with the output end of the first input conversion unit and the input end of a power consumption device, and are used for converting the input voltage.

[0007] The boost unit at least comprises a boost circuit connected with the secondary side of the transformer. The boost circuit is a PWM control circuit, and the conversion of the input voltage range is realized based on PWM control.

[0008] Further, the boost circuit comprises a first inductor and a second inductor connected in series at the secondary side of the transformer, and a triode connected with the first inductor and the second inductor respectively.

[0009] The first inductor and the second inductor are connected in series, and the connection end of the first inductor and the second inductor is connected with a switch and a storage battery connected in series.

[0010] The boost circuit further comprises a transistor, a collector of the transistor is connected with the connection line of the first inductor and the power supply unit, a base of the transistor is connected with the connection line of the second inductor and the power supply unit, and an emitter of the transistor is connected with the battery;

[0011] The second inductor is connected with a first resistor away from one end of the first inductor, and an output end of the first resistor is connected with the base of the transistor.

[0012] Further, the boost unit further comprises a voltage stabilizing circuit; the voltage stabilizing circuit comprises a third inductor connected with the primary side of the transformer, and the third inductor is connected with a first capacitor and a second capacitor in parallel at both ends;

[0013] The third inductor is connected with a diode between the first capacitor;

[0014] The first capacitor and the second capacitor are provided with a voltage stabilizing tube in parallel with the first capacitor and the second capacitor;

[0015] The first capacitor and the voltage stabilizing tube are connected with a second resistor between them.

[0016] Further, the second input conversion unit is provided with three groups, and the three groups of the second input conversion unit are connected in parallel.

[0017] Further, the second input conversion unit comprises an input EMI filter unit, a DC / DC conversion unit, an output filter unit and an output redundancy unit connected in sequence.

[0018] Further, the input EMI filter unit is connected with the output end of the first input conversion unit, and the input EMI filter unit is an LC common mode filter, wherein the filter inductance of the LC common mode filter is selected from amorphous magnetic ring, and the filter inductance and the filter capacitance in the LC common mode filter form a π-type filter circuit.

[0019] Further, the DC / DC conversion unit converts the input high voltage into low voltage direct current voltage for supplying power to the load device; and the DC / DC conversion unit is a DC / DC converter.

[0020] Further, the output filter unit is an output low ripple filter circuit for reducing the ripple voltage of the output end of the DC / DC conversion unit power supply.

[0021] Further, the output redundancy unit is a redundancy circuit for regulating the output voltage so that the regulated output voltage is consistent with the output voltage of the DC / DC conversion unit, and an N-channel field effect transistor and an ideal diode controller are connected in series at the output end of the redundancy circuit, which can prevent the output voltage from backflowing and play a fault isolation role while ensuring that the power supply voltage load change amplitude is small, and the output end of the output redundancy unit is connected with the input end of the power-using device.

[0022] Compared with the prior art, the application has the beneficial effects that the conversion module is composed of the boosting unit, the input EMI filter unit, the DC / DC conversion unit, the output filter unit and the output redundancy unit, and the power conversion can be realized under the condition that the module size is small enough.

[0023] Meanwhile, a winding is added to the secondary side of the transformer, which can improve the transformer ratio, and a switch tube is added at the connection between the original winding and the new winding, the switch tube is turned on when high voltage is input, and the switch tube is turned off when low voltage is input, so that wide-range input is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] The following drawings only schematically illustrate and explain the application and do not serve to limit the scope of the application, in which:

[0025] Figure 1 is a schematic block diagram of the application;

[0026] Figure 2 is a circuit diagram of the boosting unit in the application;

[0027] Figure 3 is a circuit diagram of the connection between the input EMI filter unit and the DC / DC conversion unit in the application;

[0028] Figure 4 is a circuit diagram of the output filter unit in the application;

[0029] Figure 5 is a circuit diagram of the output redundancy unit in the application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions, design methods and advantages of the application more clear and explicit, the application is further described in detail below by combining with the drawings through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not serve to limit the application.

[0031] The application is a power conversion module which converts external power supply DC high voltage 400VDC-1200VDC input into 25VDC / 2KW. The wide range power module applies PWM digital redundant control technology to complete the power conversion from 400VDC-1200VDC high voltage DC input to 25VDC / 2KW DC stable output, and meets the stable power supply of different external power input voltage equipment.

[0032] Referring to Figures 1-5 The application provides a wide range power conversion module, which comprises a first input conversion unit and a second input conversion unit;

[0033] The input end of the first input conversion unit is connected with the transformer of an external power supply equipment, for increasing the conversion range of input voltage;

[0034] The input end and the output end of the second input conversion unit are connected with the output end of the first input conversion unit and the input end of a power consumption equipment respectively, for voltage power conversion of input voltage;

[0035] The boost unit at least comprises a boost circuit connected with the secondary side of the transformer, and the boost circuit is a PWM control circuit, which realizes the conversion of input voltage range based on PWM control.

[0036] In the above, referring to Figures 1-5 The boost circuit comprises a first inductor L2 and a second inductor L3 connected with the secondary side of the transformer, and a triode VT connected with the first inductor L2 and the second inductor L3 respectively;

[0037] The first inductor L2 and the second inductor L3 are connected in series, and a switch S and a storage battery GB are connected in series at the connection end of the first inductor L2 and the second inductor L3;

[0038] The boost circuit further comprises a triode VT, the collector of the triode VT is connected with the connection line of the first inductor L2 and the power supply unit, the base of the triode VT is connected with the connection line of the second inductor L3 and the power supply unit, and the emitter of the triode VT is connected with the storage battery GB;

[0039] The first resistor R2 is connected with the end of the second inductor L3 away from the first inductor L2, and the output end of the first resistor R2 is connected with the base of the triode VT.

[0040] In the above, referring to Figures 1-5As shown, the voltage boosting unit further comprises a voltage stabilizing circuit; the voltage stabilizing circuit comprises a third inductor L1 connected to the primary side of the transformer, and the two ends of the third inductor L1 are connected with a first capacitor C1 and a second capacitor C2 in parallel; a diode VD1 is connected between the third inductor L1 and the first capacitor C1; a voltage stabilizing tube VD2 is arranged between the first capacitor L2 and the second capacitor C2, and the voltage stabilizing tube VD2 is connected with the first capacitor C1 and the second capacitor C2 in parallel; a second resistor R1 is connected between the first capacitor C1 and the voltage stabilizing tube VD2.

[0041] A winding is added to the secondary side of the transformer, which can improve the transformer ratio, and a switch tube is added at the connection between the original winding and the added winding. When high voltage is input, the switch tube is turned on, and when low voltage is input, the switch tube is turned off, thereby realizing wide-range input.

[0042] In the above, with reference to Figures 1-5 As shown, the second input conversion unit is provided with three groups, and the three groups of the second input conversion unit are connected in parallel; the second input conversion unit comprises an input EMI filter unit, a DC / DC conversion unit, an output filter unit and an output redundancy unit connected in sequence;

[0043] The input EMI filter unit is connected with the output end of the first input conversion unit, and the input EMI filter unit is an LC common mode filter, wherein the filter inductor of the LC common mode filter is selected from amorphous magnetic rings, and the filter inductor and the filter capacitor in the LC common mode filter form a π-type filter circuit. The filter circuit is used for shielding processing and common mode interference suppression on the input power line, so as to avoid that the internal electromagnetic interference signals of the circuit are superimposed on the input power line through the coupling path;

[0044] The DC / DC conversion unit converts the input high voltage into low voltage direct current voltage, which is used for power supply of the load device; the DC / DC conversion unit is a DC / DC converter, which has an output short circuit and overcurrent protection function. When the second input conversion unit has a short circuit or overcurrent, the output voltage will be reduced or zero, and the output can be automatically restored when the fault is removed. The converter has an overheat protection function, and the second input conversion unit has an abnormal heat, and the output of this path is closed;

[0045] The output filter unit is an output low ripple filter circuit, and the peak-peak value of the ripple voltage of the DC-DC converter is about 200mV. The low ripple filter circuit can reduce the ripple voltage of the power output end of the DC / DC conversion unit, so that the output ripple voltage is below 100mV;

[0046] The output redundancy unit is similar to an ideal diode with a large current, the output redundancy unit is a redundancy circuit, the output redundancy units 1-3 are in parallel with each other and are redundantly connected to each DC / DC conversion unit, and the output voltage of each DC / DC conversion unit is adjusted to be as consistent as possible. An output voltage regulator is used to adjust the output voltage so that the adjusted output voltage is consistent with the output voltage of the DC / DC conversion unit. An N-channel field effect transistor and an ideal diode controller are connected in series at the output of the redundancy circuit. The N-channel field effect transistor and the ideal diode controller prevent the output voltage from flowing backward and isolate faults while ensuring that the load variation of the power supply voltage is small. The output of the output redundancy unit is connected to the input of the electrical equipment. During operation, each DC / DC conversion unit is in a hot backup state, and when one of the DC / DC conversion units fails and does not output, the remaining DC / DC conversion units can operate normally.

[0047] The above has described embodiments of the present application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications, or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A wide-range power conversion module, characterized in that, The power conversion module includes a first input conversion unit and a second input conversion unit; The input terminal of the first input conversion unit is connected to the transformer of the external power supply equipment to increase the conversion range of the input voltage; The input and output terminals of the second input conversion unit are respectively connected to the output terminal of the first input conversion unit and the input terminal of the electrical device, and are used to perform voltage-power conversion on the input voltage; The power conversion module further includes a boost unit, which includes at least a boost circuit connected to the secondary side of the transformer. The boost circuit is a PWM control circuit that uses PWM control to convert the input voltage range.

2. The wide-range power conversion module according to claim 1, characterized in that, The boost circuit includes a first inductor and a second inductor connected to the secondary side of the transformer, and a transistor connected to the first inductor and the second inductor respectively. The first inductor and the second inductor are connected in series, and the connection terminals of the first inductor and the second inductor are connected in series with a switch and a battery. The boost circuit also includes a transistor, the collector of which is connected to the connection line between the first inductor and the power supply unit, the base of which is connected to the connection line between the second inductor and the power supply unit, and the emitter of which is connected to the battery. The end of the second inductor furthest from the first inductor is connected to a first resistor, and the output terminal of the first resistor is connected to the base of the transistor.

3. The wide-range power conversion module according to claim 1, characterized in that, The boost unit also includes a voltage regulator circuit; the voltage regulator circuit includes a third inductor connected to the primary side of the transformer, and a first capacitor and a second capacitor are connected in parallel across the two ends of the third inductor. A diode is connected between the third inductor and the first capacitor; A Zener diode is provided between the first capacitor and the second capacitor, and the Zener diode is connected in parallel with both the first capacitor and the second capacitor. A second resistor is connected between the first capacitor and the Zener diode.

4. The wide-range power conversion module according to claim 1, characterized in that, The second input conversion unit is provided in three groups, and the three groups of the second input conversion unit are connected in parallel.

5. The wide-range power conversion module according to claim 4, characterized in that, The second input conversion unit includes an input EMI filter unit, a DC / DC conversion unit, an output filter unit, and an output redundancy unit connected in sequence.

6. The wide-range power conversion module according to claim 5, characterized in that, The input EMI filtering unit is connected to the output terminal of the first input conversion unit. The input EMI filtering unit is an LC common-mode filter, wherein the filter inductor of the LC common-mode filter is an amorphous magnetic ring, and the filter inductor and filter capacitor in the LC common-mode filter form a π-type filter circuit.

7. The wide-range power conversion module according to claim 5, characterized in that, The DC / DC conversion unit converts the input high voltage into a low DC voltage to power the load device; the DC / DC conversion unit is a DC / DC converter.

8. The wide-range power conversion module according to claim 5, characterized in that, The output filtering unit is a low-ripple output filtering circuit used to reduce the ripple voltage at the power output terminal of the DC / DC converter unit.

9. The wide-range power conversion module according to claim 5, characterized in that, The output redundancy unit is a redundant circuit used to adjust the output voltage so that the adjusted output voltage is consistent with the output voltage of the DC / DC conversion unit. The output terminal of the redundant circuit is connected in series with an N-channel MOSFET and an ideal diode controller to prevent the output voltage from flowing back and to play a fault isolation role. The output terminal of the output redundancy unit is connected to the input terminal of the electrical equipment.

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