Wide voltage range output circuit

Abstract

The utility model discloses an output circuit with a wide voltage range, which relates to the field of power supply and comprises a direct current-alternating current conversion module used for completing conversion from direct current to alternating current through four power tubes; the transformation amplification module is used for amplifying and outputting the alternating current through series connection of primary sides of two transformers; the rectifying and filtering module is used for rectifying and filtering the output alternating current to enable the output alternating current to become stable direct current; the DC-AC module is connected with the transformation amplification module, and the transformation amplification module is connected with the rectification filtering module. Compared with the prior art, the utility model has the beneficial effects that the number of the power tubes at the primary side of the circuit is reduced from two paths of eight to four, the primary sides of the transformers are connected in series, the secondary sides of the transformers are respectively rectified by the diodes, and then the switching between the series connection state and the parallel connection state is realized by the switches S1 and S2, so that the circuit structure is simple, the product cost is lower, and the size is smaller.

Description

Technical Field

[0001] The utility model relates to the field of power supply, in particular to a wide voltage range output circuit. Background Art

[0002] See also Figure 1 , the traditional electric motorcycle charger uses a controller (DSP) to control 8 power tubes ( Figure 1 The conduction state of the MOSFET is used to realize the conversion of DC to AC. The voltage is amplified by transformers T1 and T2, and then rectified and filtered by diodes and capacitors to output stable DC. The series and parallel states are switched by switches S1 and S2 to supply DC to the subsequent circuits.

[0003] The disadvantage is that the number of primary power tube devices in the design reaches as many as 8, and the driving circuit structure is complex, which makes the product cost high and the volume large, and needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a wide voltage range output circuit to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A wide voltage range output circuit, comprising:

[0007] The DC-to-AC module is used to convert DC to AC through four power tubes;

[0008] The transformer amplifier module is used to amplify the AC power and output it through the series connection of two transformer primary sides;

[0009] The rectifier and filter module is used to rectify and filter the output AC power to convert it into a stable DC power;

[0010] The DC to AC module is connected to the transformer and amplifier module, and the transformer and amplifier module is connected to the rectifier and filter module.

[0011] As a further solution of the utility model: the DC to AC module includes a capacitor C6, a power tube Q1, a power tube Q2, a power tube Q3, and a power tube Q4. The first end of the power tube Q1 is connected to the first end of the power tube Q3, one end of the capacitor C6, and the positive electrode IN+ of the power supply. The third end of the power tube Q2 is connected to the third end of the power tube Q4, the other end of the capacitor C6, and the negative electrode IN- of the power supply. The third end of the power tube Q1 is connected to the first end of the power tube Q2 and the voltage transformer and amplifier module. The third end of the power tube Q3 is connected to the first end of the power tube Q4 and the voltage transformer and amplifier module. The second end of the power tube Q1 is connected to the controller. The second end of the power tube Q2 is connected to the controller. The second end of the power tube Q3 is connected to the controller. The second end of the power tube Q4 is connected to the controller.

[0012] As a further solution of the utility model: the power tube is a MOS tube.

[0013] As a further solution of the utility model: the transformer amplification module includes a transformer T1 and a transformer T2, one end of the primary side of the transformer T1 is connected to one end of the inductor L1 and one end of the inductor LMAG1, the other end of the inductor L1 is connected to the DC-AC module through the capacitor C1, one end of the primary side of the transformer T2 is connected to one end of the inductor L2 and one end of the inductor LMAG2, the other end of the inductor L2 is connected to the DC-AC module through the capacitor C2, the other end of the inductor LMAG1 is connected to the other end of the inductor LMAG2, the other end of the primary side of the transformer T1, and the other end of the primary side of the transformer T2, the secondary side of the transformer T1 is connected to the rectifier and filter module, and the secondary side of the transformer T2 is connected to the rectifier and filter module.

[0014] As a further solution of the utility model: the rectifier and filter module includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a capacitor C3, and a capacitor C4. The positive electrode of the diode D1 is connected to one end of the secondary side of the transformer T1 and the negative electrode of the diode D3. The positive electrode of the diode D2 is connected to the negative electrode of the diode D4 and the other end of the secondary side of the transformer T1. The negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the capacitor C3. The positive electrode of the diode D3 is connected to the positive electrode of the diode D4 and the other end of the capacitor C3. The positive electrode of the diode D5 is connected to one end of the secondary side of the transformer T2 and the negative electrode of the diode D7. The positive electrode of the diode D6 is connected to the negative electrode of the diode D8 and the other end of the secondary side of the transformer T2. The negative electrode of the diode D5 is connected to the negative electrode of the diode D6 and one end of the capacitor C4. The positive electrode of the diode D7 is connected to the positive electrode of the diode D8 and the other end of the capacitor C4.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: the number of power tubes on the primary side of the circuit is reduced from 8 in two paths to 4, the primary side of the transformer is connected in series, and the secondary side of the transformer is rectified by diodes respectively, and the series and parallel states are switched by switches S1 and S2. The circuit structure is simple, the product cost is low, and the volume is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a circuit diagram of a wide voltage range output circuit of an existing electric motorcycle charger.

[0017] Figure 2 The figure is a circuit diagram of a wide voltage range output circuit. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] See also Figure 2 , a wide voltage range output circuit, comprising:

[0020] The DC-to-AC module is used to convert DC to AC through four power tubes;

[0021] The transformer amplifier module is used to amplify the AC power and output it through the series connection of two transformer primary sides;

[0022] The rectifier and filter module is used to rectify and filter the output AC power to convert it into a stable DC power;

[0023] The DC to AC module is connected to the transformer and amplifier module, and the transformer and amplifier module is connected to the rectifier and filter module.

[0024] In this example: See Figure 2 The DC to AC module includes a capacitor C6, a power tube Q1, a power tube Q2, a power tube Q3, and a power tube Q4. The first end of the power tube Q1 is connected to the first end of the power tube Q3, one end of the capacitor C6, and the positive electrode IN+ of the power supply. The third end of the power tube Q2 is connected to the third end of the power tube Q4, the other end of the capacitor C6, and the negative electrode IN- of the power supply. The third end of the power tube Q1 is connected to the first end of the power tube Q2 and the transformer amplification module. The third end of the power tube Q3 is connected to the first end of the power tube Q4 and the transformer amplification module. The second end of the power tube Q1 is connected to the controller, the second end of the power tube Q2 is connected to the controller, the second end of the power tube Q3 is connected to the controller, and the second end of the power tube Q4 is connected to the controller.

[0025] The controller forms alternating current by controlling the conduction state of power tubes Q1, Q2, Q3, and Q4. When Q1 and Q4 are turned on, the current direction is IN+, power tube Q1, transformer amplifier module, power tube Q4, and IN-; when Q2 and Q3 are turned on, the circuit direction is IN+, power tube Q3, transformer amplifier module, power tube Q2, and IN-.

[0026] As a further solution of the utility model: the power tube is a MOS tube.

[0027] Attached Figure 2 The one in the figure is a MOS tube, and other types of power tubes can also be selected, such as triodes, IGBT tubes, etc.

[0028] In this example: See Figure 2 The transformer amplifier module includes a transformer T1 and a transformer T2. One end of the primary side of the transformer T1 is connected to one end of the inductor L1 and one end of the inductor LMAG1. The other end of the inductor L1 is connected to the DC-AC module through the capacitor C1. One end of the primary side of the transformer T2 is connected to one end of the inductor L2 and one end of the inductor LMAG2. The other end of the inductor L2 is connected to the DC-AC module through the capacitor C2. The other end of the inductor LMAG1 is connected to the other end of the inductor LMAG2, the other end of the primary side of the transformer T1, and the other end of the primary side of the transformer T2. The secondary side of the transformer T1 is connected to the rectifier and filter module, and the secondary side of the transformer T2 is connected to the rectifier and filter module.

[0029] When the power tubes Q1, Q4 or Q2, Q3 are turned on, two directions of current are formed on the primary side of the transformers T1, T2 of the transformer amplifier module. One is from top to bottom, and the other is from bottom to top, so that alternating current is formed on the primary side of the transformers T1, T2, and then amplified by the transformers T1, T2 and output.

[0030] In this example: See Figure 2The rectifier and filter module includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a capacitor C3, and a capacitor C4. The positive electrode of the diode D1 is connected to one end of the secondary side of the transformer T1 and the negative electrode of the diode D3. The positive electrode of the diode D2 is connected to the negative electrode of the diode D4 and the other end of the secondary side of the transformer T1. The negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the capacitor C3. The positive electrode of the diode D3 is connected to the positive electrode of the diode D4 and the other end of the capacitor C3. The positive electrode of the diode D5 is connected to one end of the secondary side of the transformer T2 and the negative electrode of the diode D7. The positive electrode of the diode D6 is connected to the negative electrode of the diode D8 and the other end of the secondary side of the transformer T2. The negative electrode of the diode D5 is connected to the negative electrode of the diode D6 and one end of the capacitor C4. The positive electrode of the diode D7 is connected to the positive electrode of the diode D8 and the other end of the capacitor C4.

[0031] The output AC power passes through two bridge rectifier circuits of diodes D1 to D4 and diodes D5 to D8 to complete the conversion between AC and DC, and then passes through capacitors C3 and C4 to filter the DC power to smooth it out. The series and parallel states are switched through switches S1 and S2, and the output current and voltage are collected through current sampling devices (such as ammeters) and pressure sampling devices (such as voltmeters).

[0032] Summary: Reduce the number of MOSFETs on the primary side of the circuit from 8 to 4. The transformer primary side is connected in series. After the transformer secondary side is rectified by diodes, switches S1 and S2 are used to switch between series and parallel states. The DSP controller only needs to detect the total output current and the total output voltage to control the 4 MOSFETs on the primary side. The old circuit needs to detect the output voltage and output current of the two channels respectively to control the 8 MOSFETs on the primary side of the two channels. When the output voltage is in the range of 20V-55V, the two output channels are in parallel state. At this time, the current sharing characteristics of the two output channels are determined by the difference in inductance of Lmag1 and Lmag2. When the output voltage is in the range of 55V-110V, the two output channels are in series state. At this time, the voltage sharing characteristics of the two channels are also determined by the difference in inductance of Lmag1 and Lmag2.

[0033] New circuit advantages:

[0034] 1. The transformer primary circuit of the new circuit is changed from two circuits in parallel to one circuit, and the output current and voltage detection are reduced from two groups to one group. Compared with the old circuit, 4 MOSFET drive circuits, 1 output voltage detection and 1 output current detection are reduced, which reduces the cost.

[0035] 2. Compared with the old circuit's DSP controller, which needs to individually control the driving of 8 MOSFETs, the new circuit's DSP controller only needs to control the driving of 4 MOSFETs, reducing the number of driving circuits and also reducing the difficulty of implementation.

[0036] 3. In the old circuit, when the output is in parallel, the DSP needs to control the two output currents separately to ensure the current sharing of the two paths. In the new circuit, when the output is in parallel, the DSP does not need to make additional control, but the hardware needs to ensure the consistency of the excitation inductance Lmag1 and Lmag2 of the two transformers T1 and T2, so that the current sharing function can be automatically realized.

[0037] In the old circuit, when the output is in series connection, the DSP needs to control the two output voltages separately to ensure the voltage balance of the two outputs. In the new circuit, when the output is in series connection, the DSP does not need to make additional control. As long as the hardware ensures the consistency of the excitation inductances Lmag1 and Lmag2 of the two transformers T1 and T2, the voltage balance function can be automatically achieved.

[0038] 4. The old circuit requires two split transformers plus two split inductors, which occupy a large volume. The new circuit uses leakage inductance instead of split inductors, that is, integrated transformers, which only requires two integrated transformers, reducing costs and reducing product volume.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wide voltage range output circuit, characterized in that: The wide voltage range output circuit includes: The DC-to-AC module is used to convert DC to AC through four power tubes; The transformer amplifier module is used to amplify the AC power and output it through the series connection of two transformer primary sides; The rectifier and filter module is used to rectify and filter the output AC power to convert it into a stable DC power; The DC to AC module is connected to the transformer and amplifier module, and the transformer and amplifier module is connected to the rectifier and filter module.

2. The wide voltage range output circuit according to claim 1, characterized in that: The DC to AC module includes a capacitor C6, a power tube Q1, a power tube Q2, a power tube Q3, and a power tube Q4. The first end of the power tube Q1 is connected to the first end of the power tube Q3, one end of the capacitor C6, and the positive electrode IN+ of the power supply. The third end of the power tube Q2 is connected to the third end of the power tube Q4, the other end of the capacitor C6, and the negative electrode IN- of the power supply. The third end of the power tube Q1 is connected to the first end of the power tube Q2 and the transformer amplification module. The third end of the power tube Q3 is connected to the first end of the power tube Q4 and the transformer amplification module. The second end of the power tube Q1 is connected to the controller. The second end of the power tube Q2 is connected to the controller. The second end of the power tube Q3 is connected to the controller. The second end of the power tube Q4 is connected to the controller.

3. The wide voltage range output circuit according to claim 2, characterized in that: The power tube is a MOS tube.

4. The wide voltage range output circuit according to claim 1, characterized in that: The transformer amplifier module includes a transformer T1 and a transformer T2. One end of the primary side of the transformer T1 is connected to one end of the inductor L1 and one end of the inductor LMAG1. The other end of the inductor L1 is connected to the DC-AC module through the capacitor C1. One end of the primary side of the transformer T2 is connected to one end of the inductor L2 and one end of the inductor LMAG2. The other end of the inductor L2 is connected to the DC-AC module through the capacitor C2. The other end of the inductor LMAG1 is connected to the other end of the inductor LMAG2, the other end of the primary side of the transformer T1, and the other end of the primary side of the transformer T2. The secondary side of the transformer T1 is connected to the rectifier and filter module, and the secondary side of the transformer T2 is connected to the rectifier and filter module.

5. The wide voltage range output circuit according to claim 4, characterized in that: The rectifier and filter module includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a capacitor C3, and a capacitor C4. The positive electrode of the diode D1 is connected to one end of the secondary side of the transformer T1 and the negative electrode of the diode D3. The positive electrode of the diode D2 is connected to the negative electrode of the diode D4 and the other end of the secondary side of the transformer T1. The negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the capacitor C3. The positive electrode of the diode D3 is connected to the positive electrode of the diode D4 and the other end of the capacitor C3. The positive electrode of the diode D5 is connected to one end of the secondary side of the transformer T2 and the negative electrode of the diode D7. The positive electrode of the diode D6 is connected to the negative electrode of the diode D8 and the other end of the secondary side of the transformer T2. The negative electrode of the diode D5 is connected to the negative electrode of the diode D6 and one end of the capacitor C4. The positive electrode of the diode D7 is connected to the positive electrode of the diode D8 and the other end of the capacitor C4.

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