Switching power supply control circuit and vehicle

Abstract

The invention provides a switching power supply control circuit and a vehicle. The switching power supply control circuit comprises a first side connection port, at least two paths of second side connection ports, at least two paths of voltage conversion circuits and a main control circuit. The at least two voltage conversion circuits are electrically connected between the first side connection port and the at least two second side connection ports. The main control circuit comprises at least two paths of control ports which are electrically connected with the at least two paths of voltage conversion circuits respectively, and the main control circuit controls the at least two paths of voltage conversion circuits through the at least two paths of control ports respectively, so that the at least one path of voltage conversion circuit converts the voltage input by the first side connection port; and the signals are output through at least one second side connection port. According to the invention, the dual-path output can be realized, the power demand of the vehicle can be met, the integration level is high, the number of application system nodes is small, the failure rate is low, the cost can be reduced, the assembly and maintenance are reduced, the size is small, the system is suitable for various application assembly, and the reliability of the whole power system of the vehicle can be improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a switching power supply control circuit and a vehicle. Background Art

[0002] With the continuous development of new energy vehicles, the power mode is becoming more and more diversified. The low-voltage requirements of the whole vehicle are also differentiated, and some models have requirements for both 12V and 24V low voltages. Therefore, the demand for switching power supply controllers is also diversified. The current switching power supply controller has a single output. In order to meet the above two low-voltage power supply requirements, there are two solutions: the first solution is to use a high-voltage auxiliary drive controller to provide a low-voltage system (such as 24V), and an external high-voltage controller is used to provide another low-voltage system (such as 12V); the second solution is to use a high-voltage auxiliary drive controller to provide a low-voltage system (such as 24V), and an external low-voltage controller (24V to 12V). The above two solutions not only have high system costs, low system efficiency, high personnel costs, but also high failure rates. Therefore, a dual-output switching power supply controller is urgently needed. Summary of the invention

[0003] The present application provides a switching power supply control circuit and a vehicle capable of achieving dual-channel output.

[0004] The present application provides a switching power supply control circuit, comprising:

[0005] A first side connection port and at least two second side connection ports;

[0006] at least two voltage conversion circuits, the at least two voltage conversion circuits being electrically connected between the first side connection port and the at least two second side connection ports, respectively; and

[0007] The main control circuit includes at least two control ports, which are electrically connected to the at least two voltage conversion circuits respectively. The main control circuit controls the at least two voltage conversion circuits through the at least two control ports respectively, so that at least one of the voltage conversion circuits converts the voltage input by the first side connection port and outputs it through at least one of the second side connection ports.

[0008] Preferably, each of the control ports includes a first control port and a second control port; the voltage conversion circuit includes a first conversion circuit, a voltage regulation circuit and a second conversion circuit, the first conversion circuit is electrically connected to the first side connection port and the first control port, the voltage regulation circuit is electrically connected to the first conversion circuit and the second conversion circuit, and the second conversion circuit is electrically connected to the second side connection port and the second control port; the main control circuit controls the first conversion circuit through the first control port to convert the high-voltage direct current input from the first side connection port into high-voltage alternating current, the voltage regulation circuit is used to adjust the high-voltage alternating current to low-voltage alternating current, and the main control circuit controls the second conversion circuit through the second control port to convert the low-voltage alternating current into the low-voltage direct current; the voltage values ​​of the low-voltage direct current output by the at least two voltage conversion circuits are different.

[0009] Preferably, the main control circuit includes a first detection port electrically connected to the output end of the second conversion circuit, and the main control circuit detects the electrical signal output by the output end of the second conversion circuit through the first detection port to detect whether the second side connection port is reversed.

[0010] Preferably, the main control circuit also includes a second detection port electrically connected to the input end of the second conversion circuit. The main control circuit detects the electrical signal input to the input end of the second conversion circuit through the second detection port, and controls the second conversion circuit through the second control port based on the electrical signals at the input and output ends of the second conversion circuit.

[0011] Preferably, the switching power supply control circuit also includes a voltage divider circuit and an analog-to-digital conversion circuit, and the voltage divider circuit is electrically connected to the output end of the second conversion circuit and the analog-to-digital conversion circuit; the main control circuit includes a first sampling port, which is electrically connected to the analog-to-digital conversion circuit, and the main control circuit detects the electrical signal output by the analog-to-digital conversion circuit through the first sampling port, and controls the second conversion circuit through the second control port.

[0012] Preferably, the switching power supply control circuit also includes a current source and an analog-to-digital conversion circuit, the current source is electrically connected to the output end of the second conversion circuit and the analog-to-digital conversion circuit; the main control circuit includes a second sampling port, which is electrically connected to the analog-to-digital conversion circuit, and the main control circuit detects the electrical signal output by the analog-to-digital conversion circuit through the second sampling port, and controls the second conversion circuit through the second control port.

[0013] Preferably, the analog-to-digital conversion circuit and the main control circuit are integrated into the same circuit board.

[0014] Preferably, the analog-to-digital conversion circuit is arranged separately from the main control circuit.

[0015] The present application also provides a vehicle, comprising: a switching power supply control circuit as described in any one of the above embodiments.

[0016] Preferably, the vehicle further includes a vehicle controller electrically connected to the switching power supply control circuit, wherein the vehicle controller is used to control a main control circuit of the switching power supply control circuit to control a voltage conversion circuit of the switching power supply control circuit.

[0017] Preferably, the vehicle further comprises a CAN signal line, and the vehicle controller controls at least one voltage conversion circuit of the switching power supply control circuit via the CAN signal line.

[0018] Preferably, the vehicle further comprises a power management circuit electrically connected to the switching power supply control circuit, wherein the power management circuit is used to supply power to a main control circuit of the switching power supply control circuit.

[0019] Preferably, the vehicle further includes a CAN signal line; the vehicle controller controls the main control circuit of the switching power supply control circuit through the CAN signal line to wake up the power management circuit.

[0020] Preferably, the vehicle further includes a control signal line; the vehicle controller is electrically connected to the power management circuit, and the vehicle controller wakes up the power management circuit through the control signal line.

[0021] The switching power supply control circuit and vehicle of the embodiment of the present application. The switching power supply control circuit includes a first side connection port, at least two second side connection ports, at least two voltage conversion circuits and a main control circuit. The at least two voltage conversion circuits are electrically connected between the first side connection port and the at least two second side connection ports, respectively. The main control circuit includes at least two control ports, which are electrically connected to the at least two voltage conversion circuits, respectively. The main control circuit controls the at least two voltage conversion circuits through the at least two control ports, so that the at least one voltage conversion circuit converts the voltage input by the first side connection port and outputs it through the at least one second side connection port. With such a configuration, the switching power supply control circuit of the present embodiment can achieve dual-channel output to meet the power demand of the vehicle, with high integration, few application system nodes, low failure rate, and can reduce costs, assembly and maintenance, and has a small size, suitable for assembly in a variety of applications, and can improve the reliability of the vehicle's overall power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a principle block diagram of an embodiment of a switching power supply control circuit of the present application.

[0023] Figure 2 Shown Figure 1 A schematic block diagram of another embodiment of a switching power supply control circuit is shown.

[0024] Figure 3 Shown Figure 1 A functional block diagram of another embodiment of a switching power supply control circuit is shown.

[0025] Figure 4 Shown Figure 1 A functional block diagram of another embodiment of a switching power supply control circuit is shown.

[0026] Figure 5 Shown Figure 1 A schematic block diagram of another embodiment of a switching power supply control circuit is shown.

[0027] Figure 6 Shown Figure 1 The circuit diagram of the switching power supply control circuit is shown.

[0028] Figure 7 Shown Figure 6 A flow chart of an embodiment of a control method for a switching power supply control circuit is shown. DETAILED DESCRIPTION

[0029] The switch power supply control circuit and the vehicle of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0030] Figure 1 FIG. 1 is a schematic block diagram of an embodiment of a switching power supply control circuit 10 of the present application. Figure 1As shown, the switching power supply control circuit 10 includes a connection port 11, at least two voltage conversion circuits 12 and a main control circuit 13. The connection port 11 includes a first side connection port 111 and at least two second side connection ports 112. The first side connection port 111 can be a high-side voltage connection port, as an input port, for inputting high-voltage direct current. The second side connection port 112 can be a low-side voltage connection port, as an output port, for outputting low-voltage direct current. At least two voltage conversion circuits 12 are electrically connected between the first side connection port 111 and at least two second side connection ports 112, respectively. At least two voltage conversion circuits 12 are connected to the same first side connection port 111. One of the voltage conversion circuits 12 is electrically connected between the first side connection port 111 and one of the second side connection ports 112, and the other voltage conversion circuit 12 is electrically connected between the first side connection port 111 and the other second side connection port 112. The main control circuit 13 includes at least two control ports 131, which are electrically connected to at least two voltage conversion circuits 12 respectively. The main control circuit 13 controls at least two voltage conversion circuits 12 through at least two control ports 131 respectively, so that at least one voltage conversion circuit 12 converts the voltage input from the first side connection port 111 and outputs it through at least one second side connection port 112. In some embodiments, the main control circuit 13 controls one of the voltage conversion circuits 12 through one of the control ports 131, so that the voltage conversion circuit 12 of the channel converts the voltage input from the first side connection port 111 of the channel and outputs it through one of the second side connection ports 112, thereby realizing the single-channel output of the switching power supply control circuit 10. In other embodiments, the main control circuit 13 controls two voltage conversion circuits 12 through two control ports, so that the two voltage conversion circuits 12 convert the voltages input from the two first side connection ports 111, respectively, and output them through the two second side connection ports 112, respectively, so that the dual-channel output of the switching power supply control circuit 10 can be achieved, for example, 24V and 12V low-voltage electricity can be output synchronously, so as to meet the power demand of the vehicle 1. In other embodiments, the switching power supply control circuit 10 of this embodiment can also achieve multi-channel synchronous output, which is not limited in this application.

[0031] The switching power supply control circuit 10 of this embodiment can achieve dual-channel output to meet the power demand of the vehicle 1, has high integration, few application system nodes, and low failure rate, which can reduce costs, assembly and maintenance. It is also small in size and suitable for assembly in a variety of applications, which can improve the reliability of the overall power system of the vehicle 1.

[0032] Figure 2 Shown Figure 1 FIG. 1 is a schematic block diagram of another embodiment of a switching power supply control circuit 10. Figure 2As shown, each control port 131 includes a first control port 131a and a second control port 131b. The voltage conversion circuit 12 includes a first conversion circuit 121, a voltage regulating circuit 122 and a second conversion circuit 123. The first conversion circuit 121 is electrically connected to the first side connection port 111 and the first control port 131a. The voltage regulating circuit 122 is electrically connected to the first conversion circuit 121 and the second conversion circuit 123. The second conversion circuit 123 is electrically connected to the second side connection port 112 and the second control port 131b. When the first side connection port 111 inputs a high-voltage direct current, the main control circuit 13 controls the first conversion circuit 121 through the first control port 131a to convert the high-voltage direct current input from the first side connection port 111 into a high-voltage alternating current. The voltage regulating circuit 122 is used to adjust the high-voltage alternating current into a low-voltage alternating current. The main control circuit 13 controls the second conversion circuit 123 through the second control port 131b to convert the low-voltage alternating current into a low-voltage direct current. The second side connection port 112 is used as an output port to output low-voltage direct current. The voltage values ​​of the low-voltage direct current output by at least two voltage conversion circuits 12 are different. For example, in this embodiment, at least two voltage conversion circuits 12 can output 24V and / or 12V low-voltage electricity, thus meeting the power demand of the vehicle 1. And the two voltage conversion circuits 12 share the same high-voltage side connection port, the system has fewer components, the failure rate is low, and the cost, assembly and maintenance can be reduced.

[0033] Figure 3 Shown Figure 1 FIG. 1 is a schematic block diagram of another embodiment of a switching power supply control circuit 10. Figure 3 As shown, the main control circuit 13 includes a first detection port 132, which is electrically connected to the output end of the second conversion circuit 123. The main control circuit 13 detects the electrical signal output by the output end of the second conversion circuit 123 through the first detection port 132 to detect whether the second side connection port 112 is reversely connected. Figure 3In the illustrated embodiment, the second side connection port 112 includes a second side positive connection port 112a and a second side negative connection port 112b. The first detection port 132 is connected to the second side positive connection port 112a. The main control circuit 13 detects the electrical signal output by the second side positive connection port 112a through the first detection port 132, thereby detecting the electrical signal output by the output end of the second conversion circuit 123. Wherein, when the electrical signal is greater than 0, it indicates that the second side positive connection port 112a and the second side negative connection port 112b are not reversely connected. When the electrical signal is equal to 0, it indicates that the connection between the second side positive connection port 112a and the second side negative connection port 112b is disconnected. When the electrical signal indicates less than 0, it indicates that the second side positive connection port 112a and the second side negative connection port 112b are reversely connected. In this way, the switch power supply control circuit 10 detects whether the second side positive connection port 112a and the second side negative connection port 112b are reversely connected by setting the first detection port 132, and the anti-reverse connection detection circuit detects before the voltage conversion, thus ensuring stable signal output.

[0034] exist Figure 3 In the embodiment shown, the main control circuit 13 further includes a second detection port 133, which is electrically connected to the input end of the second conversion circuit 123. The main control circuit 13 detects the electrical signal inputted from the input end of the second conversion circuit 123 through the second detection port 133, and controls the second conversion circuit 123 through the second control port 131b according to the electrical signals at the input end and the output end of the second conversion circuit 123. Figure 3 In the illustrated embodiment, the main control circuit 13 detects the electrical signal input to the input end of the second conversion circuit 123 through the second detection port 133, and detects the electrical signal output from the output end of the second conversion circuit 123 through the first detection port 132. When the electrical signal input to the input end of the second conversion circuit 123 is smaller than the electrical signal output from the output end, the second conversion circuit 123 is controlled to stop conversion through the second control port 131b to prevent current backflow. When the electrical signal input to the input end of the second conversion circuit 123 is larger than the electrical signal output from the output end, the second conversion circuit 123 is controlled to start conversion through the second control port 131b. This arrangement can prevent current backflow and improve safety.

[0035] Figure 4 Shown Figure 1 FIG. 1 is a schematic block diagram of another embodiment of a switching power supply control circuit 10. Figure 4As shown, the switching power supply control circuit 10 also includes a voltage divider circuit 14 and an analog-to-digital conversion circuit 15. The voltage divider circuit 14 is electrically connected to the output end of the second conversion circuit 123 and the analog-to-digital conversion circuit 15. The main control circuit 13 includes a first sampling port 134, which is electrically connected to the analog-to-digital conversion circuit 15. The main control circuit 13 detects the electrical signal output by the analog-to-digital conversion circuit 15 through the first sampling port 134, and controls the second conversion circuit 123 through the second control port 131b. In this embodiment, the voltage output from the output end of the second conversion circuit 123 is divided by the voltage divider circuit 14, and then converted by the analog-to-digital conversion circuit 15 to output a digital voltage signal. The main control circuit 13 samples the digital electrical signal output by the analog-to-digital conversion circuit 15 through the first sampling port 134, and controls the second conversion circuit 123 through the second control port 131b according to the digital electrical signal, so as to achieve the constant voltage output of the voltage conversion circuit 12.

[0036] Figure 5 Shown Figure 1 FIG. 1 is a schematic block diagram of another embodiment of a switching power supply control circuit 10. Figure 5 As shown, the switching power supply control circuit 10 also includes a current source 16 and an analog-to-digital conversion circuit 15, and the current source 16 is electrically connected to the output end of the second conversion circuit 123 and the analog-to-digital conversion circuit 15. The main control circuit 13 includes a second sampling port 135, which is electrically connected to the analog-to-digital conversion circuit 15. The main control circuit 13 detects the electrical signal output by the analog-to-digital conversion circuit 15 through the second sampling port 135, and controls the second conversion circuit 123 through the second control port 131b. In this embodiment, the current source 16 is used to detect the current signal output from the output end of the second conversion circuit 123. After the analog-to-digital conversion of the analog-to-digital conversion circuit 15, the current signal outputs a digital current signal. The main control circuit 13 samples the digital current signal through the second sampling port 135, and controls the second conversion circuit 123 through the second control port 131b according to the digital current signal, so as to achieve the constant current output of the voltage conversion circuit 12.

[0037] exist Figure 4 and Figure 5 In the illustrated embodiment, the analog-to-digital conversion circuit 15 is separately arranged from the main control circuit 13. Such a setting and separate arrangement facilitate maintenance. In other embodiments, the analog-to-digital conversion circuit 15 and the main control circuit 13 are integrated into the same circuit board. When the analog-to-digital conversion circuit 15 and the main control circuit 13 are integrated into the same circuit board, the main control circuit 13 is internally integrated with the analog-to-digital conversion circuit 15, and the main control circuit 13 can convert analog-to-digital signals into digital signals. High integration, fewer components, and low cost.

[0038] Figure 6 Shown Figure 1 The circuit diagram of the switching power supply control circuit 10 is shown in FIG. Figure 6 As shown, the first conversion circuit 121 includes a full-bridge circuit, the voltage regulation circuit 122 includes a transformer, and the second conversion circuit 123 includes a rectifier circuit. The two voltage conversion circuits 12 share the first side connection port 111, the second side connection port 112 and the main control circuit 13. In addition, the two voltage conversion circuits 12 also share the same voltage detection, current detection circuit, filter circuit and safety circuit. Since the two outputs need to be controlled separately or synchronously, the power parts of the two outputs (i.e., full-bridge circuit, transformer and rectifier circuit) are designed independently, and other circuit parts can be set the same. The topology circuit is as follows Figure 6 shown.

[0039] exist Figure 6 In the illustrated embodiment, the vehicle 1 includes a vehicle controller 20 and a power management circuit 30 in addition to the switching power supply control circuit 10. The vehicle controller 20 is electrically connected to the switching power supply control circuit 10, and the vehicle controller 20 is used to control the main control circuit 13 of the switching power supply control circuit 10 to control the voltage conversion circuit 12 of the switching power supply control circuit 10. The power management circuit 30 is electrically connected to the switching power supply control circuit 10, and the power management circuit 30 is used to supply power to the main control circuit 13 of the switching power supply control circuit 10. The switching power supply control circuit 10 of this embodiment realizes dual-channel output, and uses the same power management circuit 30 to realize power management of the main control circuit 13. When the main control circuit 13 is working, the power management circuit 30 provides auxiliary power to the main control circuit 13, and the system works. When the main control circuit 13 is not working, it enters a dormant state, at which time the power management circuit 30 enters low energy consumption management, and the static current of the low energy consumption management state is ≤1mA.

[0040] exist Figure 6 In the illustrated embodiment, the vehicle 1 further includes a CAN signal line C1, and the vehicle controller 20 controls at least one voltage conversion circuit 12 of the switch power supply control circuit 10 through the CAN signal line C1. In this configuration, the vehicle controller 20 controls the main control circuit 13 through the CAN signal line C1. Using one CAN signal line C1, flexible control can be performed through CAN instructions. If two outputs need to be controlled simultaneously, only a start or stop instruction needs to be sent to the main control circuit 13, and the main control circuit 13 can output the two outputs synchronously at the same time. If two outputs need to be controlled separately, different instructions can be used to control the start and stop or power limit of the two outputs respectively, which is very convenient for vehicle application.

[0041] exist Figure 6In the illustrated embodiment, the vehicle controller 20 controls the main control circuit 13 of the switch power control circuit 10 through the CAN signal line C1 to wake up the power management circuit 30. In some other embodiments, the vehicle 1 further includes a control signal line. The vehicle controller 20 is electrically connected to the power management circuit 30, and the vehicle controller 20 wakes up the power management circuit 30 through the control signal line. The switch power control circuit 10 has hard line wake-up and CAN wake-up functions. As long as any wake-up source is valid, the power management circuit 30 starts to run, and the main control circuit 13 enters a normal working state.

[0042] The switching power supply control circuit 10 of this embodiment uses the same main control circuit 13, interacts with the vehicle controller 20 through the CAN signal line C1, and can achieve dual-channel output or single-channel output, as well as adjustment of the maximum output power according to the control command. The switching power supply control circuit 10 of this embodiment is provided with two low-voltage systems, which are converted by two voltage conversion circuits 12 respectively to output 24V and / or 12V low-voltage direct current to meet the power demand of vehicles in the market.

[0043] exist Figure 6 In the embodiment shown, the implementation logic of the switch power supply control circuit 10 of this embodiment includes: the switch power supply control circuit 10 implements the control of the dual output function according to the CAN signal line C1 instruction. When the DC power supply receives the start command, the main control circuit 13 controls the 24V output branch and / or the 12V output branch respectively.

[0044] In some embodiments, the 24V output branch control includes: the main control circuit 13 includes a plurality of first drive circuits (not shown) and a plurality of second drive circuits (not shown), and the first drive circuit and the second drive circuit can both be PWM drive circuits. The full-bridge circuit of the voltage conversion circuit 12 includes first MOS tubes M1, M2, M3 and M4, and the rectifier circuit of the voltage conversion circuit 12 includes a plurality of second MOS tubes M5 and M6. The main control circuit 13 is provided with a plurality of first control ports 131a, for example, including a plurality of first control ports DRV_A, DRV_B, DRV_C and DRV_D, which are electrically connected to the plurality of first MOS tubes M1, M2, M3 and M4, respectively. The main control circuit 13 is also provided with a plurality of second control ports 131b, for example, including a plurality of second control ports DRV_E and DRV_F, which are electrically connected to the plurality of second MOS tubes M5 and M6. The main control circuit 13 performs PWM control on the four first MOS transistors M1, M2, M3 and M4 through multiple first drive circuits and multiple first control ports DRV_A, DRV_B, DRV_C and DRV_D to convert the high-voltage direct current of the first side connection port 111 into alternating current. The transformer performs isolation transformation into low-voltage alternating current, and then controls the two second MOS transistors M5 and M6 through multiple second drive circuits and multiple second control ports DRV_E and DRV_F to convert the low-voltage alternating current into low-voltage direct current, realizing the conversion from high-voltage input to low-voltage output, and then outputs through the second side connection port 112.

[0045] In order to prevent the reverse connection and current backflow of the second side connection port 112 from damaging the rectifier circuit, before starting the output, the main control circuit 13 needs to detect the output voltage U2 of the low-voltage second side connection port 112 and make a state judgment based on the U2 value. Among them, when U2 < 0V, it indicates that the positive and negative poles of the second side connection port 112 are reversed, and a fault is reported, prompting the user to readjust the wiring. When U2 = 0V, it indicates that the positive and negative poles of the second side connection port 112 are disconnected, and a fault is reported, prompting the user to reconnect. When U2 > 0V, it indicates that the positive and negative poles of the second side connection port 112 are normal, and the full-bridge circuit can be driven to work through DRV_A, DRV_B, DRV_C and DRV_D. This setting ensures that the circuit outputs stably before the full-bridge circuit works.

[0046] After the full-bridge circuit works, the duty cycle of the PWM signals of the four first drive circuits is controlled through multiple first control ports DRV_A, DRV_B, DRV_C and DRV_D to adjust the primary voltage of the transformer, thereby adjusting the secondary voltage U1 of the transformer. The secondary voltage U1 can also be the voltage flowing into the rectifier circuit. At this time, according to the comparison of the voltage values ​​of U1 and U2, the rectifier output is adjusted through DRV_E and DRV_F. Among them, when U1<U2, the duty cycle of DRV_E and DRV_F is adjusted to 0 to prevent current backflow. When U1≥U2, DRV_E and DRV_F are gradually adjusted to achieve a low-voltage slow rise output of the second side connection port output. Before the output voltage reaches the rated voltage, the current loop control logic is used. Before the current exceeds the rated current, the output voltage is gradually raised; when the output voltage reaches the rated voltage, the voltage loop control logic is used to stabilize the output voltage at the rated voltage. This setting ensures that the switching power supply control circuit 10 has a stable output.

[0047] exist Figure 6 In the embodiment shown, the main control circuit 13 includes a first sampling port 134 (U2) and a second sampling port 135 (U2'), which collect data through a voltage division method and an analog-to-digital conversion circuit to achieve constant voltage control. Figure 5 As shown, the main control circuit 13 also includes a current source (such as Figure 5 As shown in the figure, after the current source converts the current into voltage, it is collected through the analog-to-digital conversion circuit to achieve constant current control.

[0048] Similarly, the 12V output branch of the switching power supply control circuit 10 of the present application is controlled by the main control circuit 13, which controls the voltage conversion circuit 12 through multiple second control ports DRV_A', DRV_B', DRV_C' and DRV_D', and multiple second control ports DRV_E' and DRV_F'. The control logic is the same as the 24V control logic and will not be repeated here.

[0049] In the above scheme, the switch power supply control circuit 10 of this embodiment is compared with the related art. Except for the full-bridge circuit, transformer and rectifier circuit, other circuits are shared, and the system integration is high. And it can realize single-channel output or dual-channel synchronous output, for example, 24V / 3kW and 12V / 1.5kW respectively, which can meet the dual power supply system requirements of the whole vehicle at the same time, or the single power supply system requirements, and after the dual-channel output function is verified by performance, the single-channel output does not need to be verified again, which can realize multiple expansion applications of one product and meet multiple applications. The main control circuit 13 of this embodiment uses a CAN signal line C1, which can be flexibly controlled by CAN instructions. If it is necessary to control the two outputs at the same time, it is only necessary to send a start or stop instruction to the main control circuit 13, and the main control circuit 13 can output the two outputs synchronously at the same time; if it is necessary to control the two outputs separately, different instructions can be used to control the start and stop or power limit of the two outputs respectively, which is very convenient for the whole vehicle application, that is, the same instruction control is used to achieve flexible application. When the whole vehicle uses the switching power supply control circuit 10, it can meet the requirements of the dual-power supply system. Compared with the related technology, it can not only save high-voltage wiring harnesses, high-voltage connectors, etc., but also the main control circuit 13 is composed of two independent bodies combined into an integrated body, so the system components are reduced.

[0050] Figure 7 Shown Figure 6 FIG. 1 is a flow chart of an embodiment of a control method of a switching power supply control circuit 10. Figure 7 In the embodiment shown, the use logic of the switch power supply control circuit 10 of the embodiment includes: the vehicle controller 20 controls the dual-output switch power supply control circuit 10 through the CAN signal line C1, and the CAN interaction signal between the two main control circuits 13 is shown in Table 1:

[0051] Table 1 CAN signal interaction table

[0052]

[0053] Combination Figure 7 As shown, the vehicle controller 20 controls the main control circuit 13 according to the operating conditions of the vehicle: when 24V and 12V need to be output simultaneously, the vehicle controller 20 sends the working mode control instruction DCDC_ENA_MODE=3 to the main control circuit 13; when 24V output alone is required, DCDC_ENA_MODE=1; when 12V output alone is required, DCDC_ENA_MODE=2; if there is no requirement, DCDC_ENA_MODE=0 (default state at power-on).

[0054] When DCDC_ENA_MODE is valid, the vehicle controller 20 controls the start and stop of the main control circuit 13 output through DCDC_ENA. When DCDC_ENA=1, the work starts. When DCDC_ENA=0 (power-on default state), the work stops. The main control circuit 13 feeds back the current working state DCDC_WorkSts to the vehicle controller 20 in real time.

[0055] When DCDC is in working state, the output power of each branch is controlled according to the power settings DCDC_24V_PwrLimit and DCDC_12V_PwrLimit of the vehicle controller 20. For example, the output power of the 24V branch = rated power * DCDC_24V_PwrLimit / 100. The output power of the 12V branch = rated power * DCDC_12V_PwrLimit / 100.

[0056] In the above scheme, a dual-output switching power supply control circuit is designed and developed to solve the different requirements of some extended-range vehicles on the market for low-voltage systems (12V and 24V coexist). Compared with the relevant technology, it has the following advantages: (1) The product is highly integrated and low cost: Compared with the relevant technology, the switching power supply control circuit 10 of this embodiment is independent of the full-bridge circuit, transformer and synchronous rectification circuit, and other circuits (such as high-voltage connectors, EMC filter circuits, safety circuits, auxiliary power circuits and main control circuits, etc.) are shared, and the overall cost advantage is very obvious. (2) Dual-channel output to meet a variety of applications: The switching power supply control circuit 10 of this embodiment has dual-channel outputs, which are 24V / 3kW and 12V / 1.5kW respectively, which can meet the dual power supply system requirements of the whole vehicle or the single power supply system requirements at the same time. After the dual-channel output function has been verified by performance, the single-channel output does not need to be verified again, and a product can be expanded into multiple applications. If the whole vehicle only needs one power supply, the unused branch can be removed. The system stability is the same as the dual-channel output system stability, and the unit cost is no different from the existing cost. (3) The product uses command control, and the application is flexible and convenient: the main control circuit 13 of the switching power supply control circuit 10 of this embodiment uses a CAN signal line, which can be flexibly controlled by CAN commands. If you need to control two outputs at the same time, you only need to send a start or stop command to the main control circuit 13, and the main control circuit 13 can output the two outputs synchronously at the same time; if you need to control the two outputs separately, you can use different commands to control the start and stop or power limit of the two outputs respectively. The application of the whole vehicle is very convenient, the implementation plan is simple, and the stability is good. (4) The product application system has few components and the system failure rate is low: when the whole vehicle uses the switching power supply control circuit 10 of this embodiment, it can meet the requirements of the dual-power supply system. Compared with the relevant technology, it can not only save high-voltage wiring harnesses, high-voltage connectors, etc., but also the main control circuit 13 is composed of two independent bodies called an integrated body. The system has fewer components, and the stability will be correspondingly improved, and the system failure rate will be reduced.

[0057] It should be understood that the present application is not limited to the contents described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A switching power supply control circuit, characterized in that: include: A first side connection port and at least two second side connection ports; at least two voltage conversion circuits, the at least two voltage conversion circuits being electrically connected between the first side connection port and the at least two second side connection ports, respectively; and The main control circuit includes at least two control ports, which are electrically connected to the at least two voltage conversion circuits respectively. The main control circuit controls the at least two voltage conversion circuits through the at least two control ports respectively, so that at least one of the voltage conversion circuits converts the voltage input by the first side connection port and outputs it through at least one of the second side connection ports.

2. The switching power supply control circuit according to claim 1, characterized in that: Each of the control ports includes a first control port and a second control port; the voltage conversion circuit includes a first conversion circuit, a voltage regulation circuit and a second conversion circuit, the first conversion circuit is electrically connected to the first side connection port and the first control port, the voltage regulation circuit is electrically connected to the first conversion circuit and the second conversion circuit, and the second conversion circuit is electrically connected to the second side connection port and the second control port; the main control circuit controls the first conversion circuit through the first control port to convert the high-voltage direct current input from the first side connection port into high-voltage alternating current, the voltage regulation circuit is used to adjust the high-voltage alternating current to low-voltage alternating current, and the main control circuit controls the second conversion circuit through the second control port to convert the low-voltage alternating current into the low-voltage direct current; the voltage values ​​of the low-voltage direct current output by the at least two voltage conversion circuits are different.

3. The switching power supply control circuit according to claim 2, characterized in that: The main control circuit includes a first detection port electrically connected to the output end of the second conversion circuit. The main control circuit detects an electrical signal output by the output end of the second conversion circuit through the first detection port to detect whether the second side connection port is reversely connected.

4. The switching power supply control circuit according to claim 3, characterized in that: The main control circuit also includes a second detection port, which is electrically connected to the input end of the second conversion circuit. The main control circuit detects the electrical signal input to the input end of the second conversion circuit through the second detection port, and controls the second conversion circuit through the second control port based on the electrical signals at the input and output ends of the second conversion circuit.

5. The switching power supply control circuit according to claim 2, characterized in that: The switching power supply control circuit also includes a voltage divider circuit and an analog-to-digital conversion circuit, wherein the voltage divider circuit is electrically connected to the output end of the second conversion circuit and the analog-to-digital conversion circuit; the main control circuit includes a first sampling port, which is electrically connected to the analog-to-digital conversion circuit; the main control circuit detects the electrical signal output by the analog-to-digital conversion circuit through the first sampling port, and controls the second conversion circuit through the second control port.

6. The switching power supply control circuit according to claim 2, characterized in that: The switching power supply control circuit also includes a current source and an analog-to-digital conversion circuit, wherein the current source is electrically connected to the output end of the second conversion circuit and the analog-to-digital conversion circuit; the main control circuit includes a second sampling port, which is electrically connected to the analog-to-digital conversion circuit, and the main control circuit detects the electrical signal output by the analog-to-digital conversion circuit through the second sampling port, and controls the second conversion circuit through the second control port.

7. The switching power supply control circuit according to claim 5 or 6, characterized in that: The analog-to-digital conversion circuit and the main control circuit are integrated into the same circuit board; or The analog-to-digital conversion circuit is arranged separately from the main control circuit.

8. A vehicle, characterized in that: include: A switching power supply control circuit as claimed in any one of claims 1 to 7.

9. The vehicle according to claim 8, characterized in that The vehicle also includes a vehicle controller electrically connected to the switching power supply control circuit, and the vehicle controller is used to control a main control circuit of the switching power supply control circuit to control a voltage conversion circuit of the switching power supply control circuit.

10. The vehicle according to claim 9, characterized in that The vehicle further comprises a CAN signal line, and the vehicle controller controls at least one voltage conversion circuit of the switching power supply control circuit via the CAN signal line.

11. The vehicle according to claim 9, characterized in that The vehicle also includes a power management circuit electrically connected to the switching power control circuit, and the power management circuit is used to supply power to a main control circuit of the switching power control circuit.

12. The vehicle according to claim 11, characterized in that The vehicle further comprises a CAN signal line; the vehicle controller controls the main control circuit of the switch power control circuit through the CAN signal line to wake up the power management circuit; or The vehicle also includes a control signal line; the vehicle controller is electrically connected to the power management circuit, and the vehicle controller wakes up the power management circuit through the control signal line.

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