Switching power supply of 4kW low-voltage switched reluctance motor controller

Abstract

The utility model discloses a 4kW low-voltage switched reluctance motor controller switching power supply, which is applied to the technical field of switching power supply circuits and comprises a switching power supply circuit consisting of a control circuit, a driving circuit and a power circuit. The power circuit comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a field effect transistor Q4, a field effect transistor Q5 and a field effect transistor Q6, driving circuits are independently and electrically connected among the field effect transistor Q1, the field effect transistor Q2, the field effect transistor Q3, the field effect transistor Q4, the field effect transistor Q5 and the field effect transistor Q6, and the driving circuits are electrically connected with the control circuit. An existing switching power supply circuit is set into five paths of isolation voltage outputs, and the five paths of isolation voltage outputs are mainly composed of a main output and four paths of auxiliary outputs. The power supply circuit has the advantages of small size, high circuit integration degree, five-path isolated output and multi-path power supply, low cost of large-batch production and manufacturing of the circuit, and high practical application value.

Description

Technical Field

[0001] The utility model belongs to the technical field of switching power supply circuits, in particular to a 4kW low-voltage switched reluctance motor controller switching power supply. Background Art

[0002] A switching power supply is a high-frequency power conversion device that converts a voltage level into the voltage or current required by the user through various structures.

[0003] Currently, a Chinese utility model, publication number CN220382954U, discloses a high-efficiency switching power supply circuit. Currently, the technology in the market for small and medium-power switching power supplies is relatively mature, and the efficiency of switching power supplies is relatively good. However, for high-power, high-frequency switching power supplies, due to the need to ensure both high power and high efficiency, the vast majority of switching power supplies on the market still have significant performance deficiencies. This is particularly true for automotive reluctance motors, as each reluctance motor controller requires a switching power supply circuit to achieve motor control. Therefore, such high-performance products are extremely scarce. To address this problem, we have proposed a 4kW low-voltage switching power supply for a switched reluctance motor controller. Utility Model Content

[0004] The purpose of the utility model is to provide a 4kW low-voltage switched reluctance motor controller switching power supply, which has the advantages of a small switching power supply circuit, high circuit integration, five-way isolated output and multi-way power supply, low circuit mass production cost, and strong practicality.

[0005] The above technical objectives of the present utility model are achieved through the following technical solutions: a 4kW low-voltage switched reluctance motor controller switching power supply, including a switching power supply circuit, which is composed of a control circuit, a drive circuit and a power circuit. The power circuit includes a field-effect transistor Q1, a field-effect transistor Q2, a field-effect transistor Q3, a field-effect transistor Q4, a field-effect transistor Q5 and a field-effect transistor Q6. The field-effect transistors Q1, Q2, Q3, Q4, Q5 and Q6 are all independently electrically connected to a drive circuit, and the drive circuit is electrically connected to the control circuit.

[0006] The above technical solution configures the existing switching power supply circuit to have five isolated voltage outputs, primarily consisting of a main output and four auxiliary outputs. Simultaneously, a single-ended flyback circuit is employed to implement a multi-isolated output switching power supply design, achieving DC-to-DC conversion. This switching power supply circuit, utilizing the flyback principle, adjusts the charge and discharge time of the transformer coil by varying the duty cycle of the pulse voltage controlling the power tube, thereby stabilizing the output voltage of the switching power supply. This allows for simultaneous output of multiple, mutually isolated voltages, ensuring the stability and reliability of the main output voltage. This design offers the advantages of a compact power supply circuit, high circuit integration, and five isolated outputs for multi-power supply. Furthermore, the circuit can be mass-produced at low cost, resulting in high practical application value.

[0007] The utility model is further configured as follows: the control circuit is composed of a signal processing circuit, a sampling circuit, and a position signal detection circuit; the control circuit is powered by the +15V and +5V output power supplies of the switching power supply circuit and the output current is 1A; the input of the switching power supply circuit is a 60V DC voltage.

[0008] The above technical solution is adopted. Since the input of the switching power supply is a 60V DC power supply. The single-ended flyback topology is widely used in small-power switching power supplies. The circuit uses fewer components, has a simple circuit structure, low cost, small size, and can output multiple isolated voltages at the same time. The switching power supply circuit adopts a single-ended flyback circuit to complete the design of a multi-channel isolated output switching power supply and realize DC to DC conversion. The switching power supply circuit using the flyback principle adjusts the charging and discharging time of the transformer coil by changing the duty cycle of the pulse voltage of the control power tube to achieve the stability of the output voltage of the switching power supply. The working principle of the switching power supply using a flyback transformer is relatively simple, and the voltage output variation range is relatively large. It is most widely used in small and medium-sized switching power supplies.

[0009] The utility model is further configured such that the drains of the field effect transistors Q1 , Q3 and Q5 are not grounded together, while the drains of the field effect transistors Q2 , Q4 and Q6 are grounded together.

[0010] The present invention is further configured as follows: a diode D2 and a diode D1 are connected in series between the field effect transistor Q1 and the field effect transistor Q2, respectively; and a winding A is connected in parallel between the field effect transistor Q1 and the field effect transistor Q2 and the diodes D2 and D1.

[0011] The present invention is further configured as follows: a diode D4 and a diode D3 are connected in series between the field effect transistor Q3 and the field effect transistor Q4 respectively; and a winding B is connected in parallel between the field effect transistor Q3 and the field effect transistor Q4 and the diode D4 and the diode D3.

[0012] The present invention is further configured as follows: a diode 62 and a diode D5 are connected in series between the field effect transistor Q5 and the field effect transistor Q6 respectively; a winding C is connected in parallel between the field effect transistor Q5 and the field effect transistor Q6 and the diode D6 and the diode D4.

[0013] The utility model is further configured as follows: the drive circuit of the field effect transistor Q1 is powered by the +15VA, -5VA, and 0VA output power supplies of the switching power supply circuit; the drive circuit of the field effect transistor Q3 is powered by the +15VB, -5VB, and 0VB output power supplies of the switching power supply circuit; the drive circuit of the field effect transistor Q5 is powered by the +15VC, -5VC, and 0VC output power supplies of the switching power supply circuit; and the output current of the field effect transistor Q1, the field effect transistor Q3, and the field effect transistor Q5 are all 0.1A.

[0014] The present invention is further configured as follows: the field effect transistor Q2, the field effect transistor Q4 and the field effect transistor Q6 are all powered by the +15VG, -5VG and 0VG output power supplies of the switching power supply circuit, and the output current is 0.2A.

[0015] The utility model is further configured as follows: the switching power supply circuit adopts a single-ended flyback circuit, the core closed-loop control device of the switching power supply circuit is a high-frequency transformer and a current-type control chip UC3842, the switch control device is a MOSFET, and the auxiliary circuit is an output filter unit circuit and a sampling feedback channel circuit module and a DC / DC conversion circuit.

[0016] The above-mentioned technical solution adopts a topology with five isolated voltage outputs on the secondary side of the transformer. The main output circuit uses the UC3842 as a key component, forming a dual closed-loop feedback system with voltage and current feedback in current-mode control mode, ensuring the stability and reliability of the main output voltage. The flyback transformer's secondary winding stores energy when the IRF640 is on and releases energy when it is off, while also performing filtering. Small inductor filtering at the load end is used as a supplementary filter, while large capacitor filtering is used as the primary filter to reduce output voltage spikes. When the transformer's secondary winding releases energy, a secondary circuit is formed, which is rectified by diodes. The five isolated outputs utilize a combination of half-wave and full-bridge rectification. The auxiliary output VOA undergoes transformer transformation, full-bridge rectification, filtering by inductors and large capacitors, voltage regulation by 7815, 7912, or 7905 regulators, and capacitor filtering before output. The three auxiliary outputs VOB, VOC, and VOD use diodes for half-wave rectification and transistor S8050 to amplify the current to meet the load's current output requirements.

[0017] In summary, the present invention has the following beneficial effects:

[0018] By configuring the existing switching power supply circuit to have five isolated voltage outputs, primarily consisting of a main output and four auxiliary outputs, and simultaneously employing a single-ended flyback circuit, a multi-isolated output switching power supply design is achieved, enabling DC-to-DC conversion. This switching power supply circuit, utilizing the flyback principle, adjusts the charge and discharge time of the transformer coil by varying the duty cycle of the pulse voltage controlling the power transistor, achieving stable output voltage. This allows for simultaneous output of multiple, mutually isolated voltages, ensuring the stability and reliability of the main output voltage. This design offers the advantages of a compact power supply circuit, high circuit integration, and five isolated outputs for multiple power supplies. Furthermore, the circuit can be mass-produced at low cost, offering high practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the working process of the main output circuit of the switching power supply of the utility model;

[0020] Figure 2 This is a schematic diagram of the workflow of the SRM drive and test system of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the three-phase SRM asymmetric half-bridge circuit of the utility model;

[0022] Figure 4 This is the output power supply data sheet of this utility model. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] Example 1:

[0025] refer to Figure 1 、 Figure 2 、 Figure 3The 4kW low-voltage switched reluctance motor controller switching power supply includes a switching power supply circuit, which consists of a control circuit, a drive circuit, and a power circuit. The power circuit includes field-effect transistors Q1, Q2, Q3, Q4, Q5, and Q6. Each of these transistors is independently electrically connected to a drive circuit, which is also electrically connected to the control circuit. By configuring the existing switching power supply circuit to have five isolated voltage outputs, primarily consisting of a main output and four auxiliary outputs, and simultaneously sampling using a single-ended flyback circuit, a multi-isolated output switching power supply design is achieved, enabling DC-to-DC conversion. The switching power supply circuit, utilizing the flyback principle, adjusts the charge and discharge time of the transformer coil by varying the duty cycle of the pulse voltage controlling the power transistor, thereby achieving stable output voltage. This allows for simultaneous output of multiple isolated voltages, ensuring the stability and reliability of the main output voltage. The power supply circuit has the advantages of small size, high circuit integration, five-way isolated output and multi-way power supply, and the circuit has low manufacturing cost in mass production and high practical application value.

[0026] refer to Figure 3 The control circuit consists of a signal processing circuit, a sampling circuit, and a position signal detection circuit. It is powered by the +15V and +5V outputs of the switching power supply circuit, with an output current of 1A. The switching power supply circuit input is a 60V DC voltage. Since the switching power supply input is a 60V DC power supply, the single-ended flyback topology is widely used in low-power switching power supplies. It uses few components, has a simple circuit structure, is low-cost, is compact, and can simultaneously output multiple isolated voltages. The switching power supply circuit uses a single-ended flyback circuit to achieve a multi-channel isolated output switching power supply design, realizing DC-to-DC conversion. Switching power supply circuits using the flyback principle adjust the charge and discharge time of the transformer coil by varying the duty cycle of the pulse voltage controlling the power transistor, thereby achieving stable output voltage. Switching power supplies using a flyback transformer have a relatively simple operating principle and a wide voltage output range, making them the most widely used in small and medium-sized switching power supplies.

[0027] refer to Figure 3 The drains of field effect transistors Q1, Q3, and Q5 are not grounded, while the drains of field effect transistors Q2, Q4, and Q6 are grounded.

[0028] refer to Figure 3 A diode D2 and a diode D1 are connected in series between the field effect transistor Q1 and the field effect transistor Q2, respectively, and a winding A is connected in parallel between the field effect transistor Q1 and the field effect transistor Q2 and the diode D2 and the diode D1.

[0029] refer to Figure 3 A diode D4 and a diode D3 are connected in series between the field effect transistor Q3 and the field effect transistor Q4, respectively. A winding B is connected in parallel between the field effect transistor Q3 and the field effect transistor Q4 and the diode D4 and the diode D3.

[0030] refer to Figure 3 A diode 62 and a diode D5 are connected in series between the field effect transistor Q5 and the field effect transistor Q6, respectively. A winding C is connected in parallel between the field effect transistor Q5 and the field effect transistor Q6 and the diode D6 and the diode D4.

[0031] refer to Figure 3 The driving circuit of the field effect transistor Q1 is powered by the +15VA, -5VA, and 0VA output power supplies of the switching power supply circuit; the driving circuit of the field effect transistor Q3 is powered by the +15VB, -5VB, and 0VB output power supplies of the switching power supply circuit; the driving circuit of the field effect transistor Q5 is powered by the +15VC, -5VC, and 0VC output power supplies of the switching power supply circuit; the output current of the field effect transistors Q1, Q3, and Q5 are all 0.1A.

[0032] refer to Figure 3 , FET Q2, FET Q4 and FET Q6 are all powered by the +15VG, -5VG and 0VG output power supplies of the switching power supply circuit and the output current is 0.2A.

[0033] refer to Figure 1 、 Figure 2 The switching power supply circuit utilizes a single-ended flyback circuit. The core closed-loop control components are a high-frequency transformer and the UC3842 current-mode control chip, the switching control device is a MOSFET, and the auxiliary circuits include an output filter unit circuit, a sampling feedback channel circuit module, and a DC / DC converter circuit. The adopted topology features five isolated voltage outputs on the secondary side of the transformer. The main output circuit utilizes the UC3842 as the key component, forming a dual closed-loop feedback system with voltage and current feedback in current-mode control mode, ensuring the stability and reliability of the main output voltage. The flyback transformer's secondary winding stores energy when the IRF640 is on and releases energy and performs filtering when the IRF640 is off. Small inductor filtering is used as a supplementary filter on the load side, while large capacitor filtering is used as the primary filter to minimize output voltage spikes. When the transformer's secondary winding releases energy, a secondary circuit is formed, which is rectified by diodes. The five isolated outputs utilize a combination of half-wave and full-bridge rectification. The auxiliary output VOA undergoes voltage transformation via a transformer, followed by full-bridge rectification, filtering with an inductor and large capacitor, and voltage regulation using 7815, 7912, or 7905 regulators. The output is then filtered by capacitors. The auxiliary outputs VOB, VOC, and VOD use diodes for half-wave rectification and S8050 transistors for current amplification to meet the load's current output requirements.

[0034] Brief description of the usage process:

[0035] First, the switching power supply circuit provides multiple isolated voltage outputs for the controller. The circuit is powered by an on-board 60V DC power supply. It also includes an inverter circuit, a flyback high-frequency transformer, a main output rectifier filter circuit, a current-mode control circuit composed of UC3842, a voltage and current feedback circuit, and a DC / DC conversion circuit composed of MC34063. The switched reluctance motor SRM is a three-phase 12 / 8-pole motor. The input power supply is the on-board battery, the input voltage is DC 60V, and the designed switching power supply has a rated output power of 30W. The control processor is an ARM chip based on the Cortex-M3 core. The circuits in the controller include switching power supply, drive circuit, overcurrent protection circuit, input, display circuit, ADC sampling circuit, and position signal adjustment circuit. The test drive system also has a load motor, a test platform, etc. The SRM drive system mainly includes: on-board power supply, switched reluctance motor SRM, controller circuit, power converter, current sensor, position detector, etc.

[0036] The position signal, current and voltage signal of the switched reluctance motor SRM are detected by the switching power supply circuit, and the control circuit generates a corresponding PWM signal. After being amplified by the drive circuit, the PWM signal controls the field effect transistors Q1, Q2, Q3, Q4, Q5 and Q6 in the power circuit to turn on and off, thereby controlling the current of the motor winding.

[0037] Since the drains of the FETs Q1, Q3, and Q5 in the controller's main circuit do not share a common ground, the three drive circuits that drive the FETs Q1, Q3, and Q5 require three sets of isolated power supplies; the drains of the FETs Q2, Q4, and Q6 share a common ground, so the three drive circuits of the FETs Q2, Q4, and Q6 only require one set of power supplies; and the control circuit requires one set of isolated power supplies.

[0038] The control circuit is then powered by the +15V and +5V output power supplies of the switching power supply circuit. Since the control circuit requires a large current drive, the output current is 1A. The drive circuit of the field effect transistor Q1 is powered by the +15VA, -5VA, and 0VA output power supplies of the switching power supply circuit. Figure 4 , Group A output power supply. The drive circuit of FET Q3 is powered by +15VB, -5VB, 0VB output power supply, please refer to Figure 4 , Group B output power supply. The drive circuit of FET Q5 is powered by +15VC, -5VC, and 0VC output power supplies. Figure 4, Group C output power supply. Group A, Group B and Group C are isolated from each other, and the output current is 0.1A. FET Q2, FET Q4 and FET Q6 are powered by +15VG, -5VG and 0VG output power supplies, please refer to Figure 4 , group D output power supply, group D current is 0.2A.

[0039] At the same time, the designed switching power supply has an input of 60V DC voltage and outputs 5 groups of isolated DC voltages, providing +5V voltage to the low-voltage reluctance motor control circuit, +15V voltage to the signal processing circuit, +15V and -5V voltages to the drive circuits of Group A, Group B and Group C, and +15V and -5V voltages to the drive circuit of Group D.

[0040] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. 4kW low voltage switched reluctance motor controller switching power supply, including a switching power supply circuit, characterized by: The switching power supply circuit is composed of a control circuit, a drive circuit and a power circuit. The power circuit includes field-effect transistors Q1, Q2, Q3, Q4, Q5 and Q6. The field-effect transistors Q1, Q2, Q3, Q4, Q5 and Q6 are independently electrically connected to a drive circuit, and the drive circuit is electrically connected to the control circuit.

2. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: The control circuit consists of a signal processing circuit, a sampling circuit, and a position signal detection circuit. The control circuit is powered by the +15V and +5V output power supplies of the switching power supply circuit and the output current is 1A. The input of the switching power supply circuit is a 60V DC voltage.

3. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: The drains of the field effect transistors Q1 , Q3 and Q5 are not grounded together, while the drains of the field effect transistors Q2 , Q4 and Q6 are grounded together.

4. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: A diode D2 and a diode D1 are connected in series between the field effect transistor Q1 and the field effect transistor Q2, respectively. A winding A is connected in parallel between the field effect transistor Q1 and the field effect transistor Q2 and the diode D2 and the diode D1.

5. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: A diode D4 and a diode D3 are connected in series between the field effect transistors Q3 and Q4, respectively. A winding B is connected in parallel between the field effect transistors Q3 and Q4 and the diodes D4 and D3.

6. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: A diode 62 and a diode D5 are connected in series between the field effect transistor Q5 and the field effect transistor Q6, respectively. A winding C is connected in parallel between the field effect transistor Q5 and the field effect transistor Q6, the diode D6 and the diode D4.

7. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: The driving circuit of the field effect transistor Q1 is powered by the +15VA, -5VA, and 0VA output power supplies of the switching power supply circuit, the driving circuit of the field effect transistor Q3 is powered by the +15VB, -5VB, and 0VB output power supplies of the switching power supply circuit, and the driving circuit of the field effect transistor Q5 is powered by the +15VC, -5VC, and 0VC output power supplies of the switching power supply circuit. The output current of the field effect transistors Q1, Q3, and Q5 is all 0.1A.

8. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: The field effect transistor Q2, field effect transistor Q4 and field effect transistor Q6 are all powered by the +15VG, -5VG and 0VG output power supplies of the switching power supply circuit, and the output current is 0.2A.

9. The 4kW low-voltage switched reluctance motor controller switching power supply according to claim 1, characterized in that: The switching power supply circuit adopts a single-ended flyback circuit. The core closed-loop control components of the switching power supply circuit are a high-frequency transformer and a current-mode control chip UC3842, the switch control device is a MOSFET, and the auxiliary circuit is an output filter unit circuit, a sampling feedback channel circuit module, and a DC / DC conversion circuit.

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