DC-DC conversion circuit, control method and device thereof, vehicle and storage medium

Abstract

The invention provides a DC-DC conversion circuit and a control method and device thereof, a vehicle and a storage medium, and the DC-DC conversion circuit comprises a first DC-DC conversion circuit which is used for receiving an input voltage and outputting a preset voltage; the second DC-DC conversion circuit is used for receiving the input voltage and outputting a preset voltage; the control circuit is used for switching on or switching off the first DC-DC conversion circuit according to a reference voltage value of the control circuit and an output voltage value of the second DC-DC conversion circuit, the first DC-DC conversion circuit is switched off through the control circuit when the load power is relatively low, and the consumed power of the first DC-DC conversion circuit is reduced; and only the second DC-DC conversion circuit is used for supplying power to the low-power load, so that the power conversion efficiency under the low-power load is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a DC-DC conversion circuit, a control method and device thereof, a vehicle, and a storage medium. Background Art

[0002] The low-voltage power supply system of a vehicle generally has a situation of multiple voltage platforms. For example, the low-voltage power supply voltage of a commercial vehicle is 24V, but there are also some devices with a 12V power supply requirement. In this case, a low-voltage DC-DC module is generally used to meet the 12V power supply requirement. The commonly used vehicle low-voltage DC-DC module mainly uses a buck circuit for voltage conversion. As Figure 1 shown, the main control chip 1 controls the on and off of the semiconductor devices MOSFET_1 and MOSFET_2 periodically to convert the 24V voltage into a 12V voltage.

[0003] When the load power is near the rated power of the vehicle low-voltage DC-DC module, the conversion efficiency of the DC-DC module is relatively high; however, when the power of the 12V load is relatively low, for example, when the vehicle 12V load enters the sleep state and still needs 12V power supply, due to a part of the power consumption of the DC-DC module itself, the conversion efficiency of the DC-DC module will drop sharply. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, an object of the present invention is to provide a DC-DC conversion circuit. When the load power is relatively low, the control circuit turns off the first DC-DC conversion circuit, reduces the power consumption of the first DC-DC conversion circuit itself, and only uses the second DC-DC conversion circuit to supply power to the low-power load, thereby improving the power conversion efficiency under low-power loads.

[0006] To this end, a second object of the present invention is to provide a control method for a DC-DC conversion circuit.

[0007] To this end, a third object of the present invention is to provide a control device for a DC-DC conversion circuit.

[0008] To this end, a fourth object of the present invention is to provide a vehicle.

[0009] To this end, a fifth object of the present invention is to provide a computer-readable storage medium.

[0010] To achieve the above object, an embodiment of the first aspect of the present invention provides a DC-DC conversion circuit, which includes: a first DC-DC conversion circuit, the first end of the first DC-DC conversion circuit is connected to a voltage input port, and the second end of the first DC-DC conversion circuit is connected to a voltage output port, for receiving an input voltage and outputting a preset voltage; a second DC-DC conversion circuit, the first end of the second DC-DC conversion circuit is connected to the voltage input port, and the third end of the second DC-DC conversion circuit is connected to the voltage output port, for receiving an input voltage and outputting a preset voltage; a control circuit, the first end of the control circuit is connected to the voltage input port, the second end of the control circuit is connected to the third end of the first DC-DC conversion circuit, and the third end of the control circuit is connected to the second end of the second DC-DC conversion circuit, for turning on or off the first DC-DC conversion circuit according to the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit.

[0011] According to the DC-DC conversion circuit of the embodiment of the present invention, two different voltage conversion circuits are combined to cope with different load powers in the scenarios of vehicle power-on and power-off, namely, the first DC-DC conversion circuit and the second DC-DC conversion circuit. The magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit is determined. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion and outputs a preset voltage to supply power to the load. By turning off the first DC-DC conversion circuit when the load power is relatively low through the control circuit, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the low-power load, improving the power conversion efficiency under the low-power load.

[0012] In some embodiments, the second DC-DC conversion circuit includes: a second main control chip, a first end of the second main control chip being connected to the voltage input port; a sampling resistor, one end of the sampling resistor being connected to a second end of the second main control chip, and the other end of the sampling resistor being connected to the voltage input port; a first voltage regulating resistor, one end of the first voltage regulating resistor being connected to the second end of the second main control chip; a second voltage regulating resistor, one end of the second voltage regulating resistor being connected to a third end of the second main control chip and the other end of the first voltage regulating resistor, and the other end of the second voltage regulating resistor being grounded, for receiving an input voltage and outputting a preset voltage according to a reference voltage value of the second main control chip, a first resistance value of the first voltage regulating resistor, and a second resistance value of the second voltage regulating resistor.

[0013] In some embodiments, the first DC-DC conversion circuit includes: a first main control chip, a first end of the first main control chip being connected to the voltage input port; a first semiconductor device, a first end of the first semiconductor device being connected to the voltage input port, and a third end of the first semiconductor device being connected to a second end of the first main control chip; a second semiconductor device, a first end of the second semiconductor device being connected to a third end of the first main control chip, a second end of the second semiconductor device being connected to the voltage input port, and a third end of the second semiconductor device being grounded; an inductor, one end of the inductor being connected to the first semiconductor device and the second semiconductor device, and the other end of the inductor being connected to the voltage output port, for receiving an input voltage, turning on the first semiconductor device and turning off the second semiconductor device, or turning off the first semiconductor device and turning on the second semiconductor device, so as to output a preset voltage.

[0014] In some embodiments, the control circuit includes: a first voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the voltage input port; a second voltage-dividing resistor, one end of the second voltage-dividing resistor is connected to the other end of the first voltage-dividing resistor, and the other end of the second voltage-dividing resistor is grounded; a second operational amplifier, a first end of the second operational amplifier is connected to the voltage input port, a third end of the second operational amplifier is connected to the other end of the sampling resistor, and a fourth end of the second operational amplifier is connected to one end of the sampling resistor, configured to obtain a first sampling voltage value and a second sampling voltage value of the sampling resistor, determine a voltage value to be output according to the first sampling voltage value and the second sampling voltage value, perform operational amplification on the voltage value to be output, and determine the output voltage value; a first operational amplifier, a first end of the first operational amplifier is connected to the voltage input port, a second end of the first operational amplifier is connected to a fourth end of the first main control chip, and a third end of the first operational amplifier is connected to a second end of the second operational amplifier, configured to enable the first main control chip and turn on the first DC-DC conversion circuit when the output voltage value is greater than or equal to the reference voltage value; when the output voltage value is greater than or equal to the reference voltage value, turn off the first main control chip and turn off the first DC-DC conversion circuit.

[0015] To achieve the above object, an embodiment of the second aspect of the present invention provides a control method for a DC-DC conversion circuit, the control method for the DC-DC conversion circuit includes: obtaining a reference voltage value of a control circuit and an output voltage value of a second DC-DC conversion circuit; turning on or off a first DC-DC conversion circuit according to the output voltage value and the reference voltage value.

[0016] According to the control method for the DC-DC conversion circuit of the embodiment of the present invention, two different voltage conversion circuits are combined to cope with different load powers in the scenarios of vehicle power-on and power-off, namely, a first DC-DC conversion circuit and a second DC-DC conversion circuit. The magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit is determined. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion and outputs a preset voltage to supply power to the load. By turning off the first DC-DC conversion circuit when the load power is relatively low through the control circuit, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the low-power load, thereby improving the power conversion efficiency under low-power loads.

[0017] In some embodiments, the first DC-DC conversion circuit includes a first main control chip, which turns on or off the first DC-DC conversion circuit according to the output voltage value and the reference voltage value, including: when the output voltage value is greater than or equal to the reference voltage value, enabling the first main control chip to turn on the first DC-DC conversion circuit; when the output voltage value is greater than or equal to the reference voltage value, turning off the first main control chip to turn off the first DC-DC conversion circuit.

[0018] In some embodiments, the second DC-DC conversion circuit includes a sampling resistor, which obtains the output voltage value of the second DC-DC conversion circuit, including: obtaining a first sampling voltage value and a second sampling voltage value of the sampling resistor; determining the output voltage value according to the first sampling voltage value and the second sampling voltage value.

[0019] To achieve the above object, an embodiment of the third aspect of the present invention provides a control device for a DC-DC conversion circuit, where the control device for the DC-DC conversion circuit includes: an acquisition module, configured to acquire a reference voltage value of a control circuit and an output voltage value of a second DC-DC conversion circuit; a control module, configured to turn on or off a first DC-DC conversion circuit according to the output voltage value and the reference voltage value.

[0020] According to the control device for a DC-DC conversion circuit of the embodiment of the present invention, two different voltage conversion circuits are combined to cope with different load powers in the scenarios of vehicle power-on and power-off, namely, a first DC-DC conversion circuit and a second DC-DC conversion circuit. The magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit is determined. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion and outputs a preset voltage to supply power to the load. By turning off the first DC-DC conversion circuit when the load power is relatively low through the control circuit, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the low-power load, improving the power conversion efficiency under low-power loads.

[0021] To achieve the above object, an embodiment of the fourth aspect of the present invention provides a vehicle, where the vehicle includes the control device for a DC-DC conversion circuit described in the above embodiment.

[0022] A vehicle according to an embodiment of the present invention uses two different voltage conversion circuits in combination to cope with different load powers in the scenarios of vehicle power-on and power-off, namely, a first DC-DC conversion circuit and a second DC-DC conversion circuit. Determine the magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit. When the output voltage value is greater than or equal to the reference voltage value, turn on the first DC-DC conversion circuit. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, turn off the first DC-DC conversion circuit, and only the second DC-DC conversion circuit performs voltage conversion to output a preset voltage to supply power to the load. By controlling the circuit to turn off the first DC-DC conversion circuit when the load power is relatively low, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the low-power load, improving the power conversion efficiency under low-power loads.

[0023] To achieve the above object, an embodiment of the fifth aspect of the present invention provides a computer-readable storage medium, on which a control program for a DC-DC conversion circuit is stored. When the control program for the DC-DC conversion circuit is executed by a processor, the control method for the DC-DC conversion circuit described in the above embodiment is implemented.

[0024] Some of the additional aspects and advantages of the present invention will be given in the following description, some will become apparent from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a hardware connection diagram of a DC-DC module according to the related art; Figure 2 is a hardware connection diagram of a DC-DC conversion circuit according to an embodiment of the present invention; Figure 3 is a flowchart of a control method for a DC-DC conversion circuit according to an embodiment of the present invention; Figure 4 A structural block diagram of a control device for a DC-DC conversion circuit according to an embodiment of the present invention; Figure 5 A block diagram of a vehicle according to an embodiment of the present invention.

[0026] REFERENCE SIGNS: DC-DC conversion circuit 10; The first DC-DC conversion circuit 1; the second DC-DC conversion circuit 2; the control circuit 3; The first main control chip 11; the first semiconductor device 12; the second semiconductor device 13; the inductor L; The second main control chip 21; the sampling resistor R5; the first voltage regulating resistor R1; the second voltage regulating resistor R2; The first voltage dividing resistor R3; the second voltage dividing resistor R4; the second operational amplifier 31; the first operational amplifier 32; The control device 100 of the DC-DC conversion circuit; The acquisition module 101; the control module 102; The vehicle 110. Specific embodiments

[0027] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0028] Taking the DCDC module as 320W as an example, the power of the general main control chip and the driving mosfet is about 0.5w. When the load power is relatively low, for example, when the vehicle 12V load controller is in sleep mode, the load current of the vehicle 12V is generally ≤15mA, that is, the power is about 0.18w. Then, the conversion efficiency of the DCDC module at this time is about 0.18w / (0.18w + 0.5w) = 22.06%, and the conversion efficiency is very low.

[0029] The following will be combined with Figure 2 Describe the DC-DC conversion circuit 10 of the embodiments of the present invention.

[0030] As Figure 2 shown, the DC-DC conversion circuit 10 includes: the first DC-DC conversion circuit 1, the second DC-DC conversion circuit 2 and the control circuit 3. Among them, The first end of the first DC-DC conversion circuit 1 is connected to the voltage input port, and the second end of the first DC-DC conversion circuit 1 is connected to the voltage output port, which is used to receive the input voltage and output a preset voltage; the first end of the second DC-DC conversion circuit 2 is connected to the voltage input port, and the third end of the second DC-DC conversion circuit 2 is connected to the voltage output port, which is used to receive the input voltage and output a preset voltage; the first end of the control circuit 3 is connected to the voltage input port, the second end of the control circuit 3 is connected to the third end of the first DC-DC conversion circuit 1, and the third end of the control circuit 3 is connected to the second end of the second DC-DC conversion circuit 2, which is used to turn on or off the first DC-DC conversion circuit 1 according to the reference voltage value of the control circuit 3 and the output voltage value of the second DC-DC conversion circuit 2.

[0031] In an embodiment, the first DC-DC conversion circuit 1 can be a Buck circuit, and the second DC-DC conversion circuit 2 can be an LDO (Low-dropout regulator) circuit. After the control circuit 3 obtains the reference voltage value of the control circuit 3 and the output voltage value of the second DC-DC conversion circuit 2, it judges the magnitude relationship between the output voltage value and the reference voltage value. If the output voltage value is greater than or equal to the reference voltage value, it is considered that the current load power is relatively large and the vehicle is in a normal power-on state. Then the first DC-DC conversion circuit 1 is turned on. The first DC-DC conversion circuit 1 and the second DC-DC conversion circuit 2 are connected in parallel to jointly perform voltage conversion and output a preset voltage of 12V to supply power to the 12V load. If the output voltage value is less than the reference voltage value, it is considered that the current load power is relatively small and the vehicle is in a power-off state. Then the first DC-DC conversion circuit 1 is turned off, and only the second DC-DC conversion circuit 2 performs voltage conversion to output a preset voltage of 12V to supply power to the 12V load, avoiding the problem that the conversion efficiency of the first DC-DC conversion circuit 1 is relatively low when the load power is relatively low.

[0032] According to the DC-DC conversion circuit 10 of the embodiment of the present invention, two different voltage conversion circuits are used in combination to cope with different load powers in the scenarios of vehicle power-on and power-off, that is, the first DC-DC conversion circuit 1 and the second DC-DC conversion circuit 2. The magnitude relationship between the reference voltage value of the control circuit 3 and the output voltage value of the second DC-DC conversion circuit 2 is determined. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit 1 is turned on. The first DC-DC conversion circuit 1 and the second DC-DC conversion circuit 2 are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit 1 is turned off, and only the second DC-DC conversion circuit 2 performs voltage conversion to output a preset voltage to supply power to the load. By turning off the first DC-DC conversion circuit 1 when the load power is relatively low through the control circuit 3, the power consumption of the first DC-DC conversion circuit 1 itself is reduced, and only the second DC-DC conversion circuit 2 is used to supply power to the low-power load, improving the power conversion efficiency under low-power loads.

[0033] In some embodiments, the second DC-DC conversion circuit 2 includes: a second main control chip 21, a sampling resistor R5, a first voltage regulating resistor R1, and a second voltage regulating resistor R2, wherein The first end of the second main control chip 21 is connected to the voltage input port; one end of the sampling resistor R5 is connected to the second end of the second main control chip 21, and the other end of the sampling resistor R5 is connected to the voltage input port; one end of the first voltage regulating resistor R1 is connected to the second end of the second main control chip 21; one end of the second voltage regulating resistor R2 is connected to the third end of the second main control chip 21 and the other end of the first voltage regulating resistor R1, and the other end of the second voltage regulating resistor R2 is grounded, for receiving the input voltage and outputting a preset voltage according to the reference voltage value of the second main control chip 21, the first resistance value of the first voltage regulating resistor R1 and the second resistance value of the second voltage regulating resistor R2.

[0034] In the embodiment, after receiving the input voltage, the second main control chip 21 determines the reference voltage value Vref of the second main control chip 21, the first resistance value of the first voltage regulating resistor R1 and the second resistance value of the second voltage regulating resistor R2, and adjusts the output voltage according to the resistance ratio between the first voltage regulating resistor R1 and the second voltage regulating resistor R2. The output voltage Vout = Vref * (R1 + R2) / R2. The second DC-DC conversion circuit 2 is mainly used for voltage conversion in the case of a small-power load.

[0035] In some embodiments, the first DC-DC conversion circuit 1 includes: a first main control chip 11, a first semiconductor device 12, a second semiconductor device 13, and an inductor denoted as L. Among them, the inductor L is selected according to the 12V load. The first end of the first main control chip 11 is connected to the voltage input port; the first end of the first semiconductor device 12 is connected to the voltage input port, and the third end of the first semiconductor device 12 is connected to the second end of the first main control chip 11; the first end of the second semiconductor device 13 is connected to the third end of the first main control chip 11, the second end of the second semiconductor device 13 is connected to the voltage input port, and the third end of the second semiconductor device 13 is grounded; one end of the inductor L is connected to the first semiconductor device 12 and the second semiconductor device 13, and the other end of the inductor L is connected to the voltage output port, for receiving the input voltage, turning on the first semiconductor device 12 and turning off the second semiconductor device 13, or turning off the first semiconductor device 12 and turning on the second semiconductor device 13 to output a preset voltage.

[0036] In an embodiment, the first main control chip 11 mainly controls the periodic on and off of the first semiconductor device 12 and the second semiconductor device 13 in the first DC-DC conversion circuit 1, receives an input voltage of 24V, turns on the first semiconductor device 12 and turns off the second semiconductor device 13, connects to the inductor L, charges the inductor L. When the inductor L is fully charged, the voltage divided to the inductor L is 12V to output a preset voltage of 12V; after the inductor L is fully charged, the first semiconductor device 12 is turned off and the second semiconductor device 13 is turned on, and the inductor L outputs a preset voltage of 12V to discharge the 12V load; after the power of the inductor L is used up, the first semiconductor device 12 is turned on again and the second semiconductor device 13 is turned off. The first DC-DC conversion circuit 1 is mainly used for voltage conversion in the case of high-power loads.

[0037] In some embodiments, the control circuit 3 includes: a first voltage-dividing resistor R3, a second voltage-dividing resistor R4, a second operational amplifier 31, and a first operational amplifier 32, where, One end of the first voltage-dividing resistor R3 is connected to the voltage input port; one end of the second voltage-dividing resistor R4 is connected to the other end of the first voltage-dividing resistor R3, and the other end of the second voltage-dividing resistor R4 is grounded; the first end of the second operational amplifier 31 is connected to the voltage input port, the third end of the second operational amplifier 31 is connected to the other end of the sampling resistor R5, and the fourth end of the second operational amplifier 31 is connected to one end of the sampling resistor R5, which is used to obtain the first sampling voltage value and the second sampling voltage value of the sampling resistor R5, determine the voltage value to be output according to the first sampling voltage value and the second sampling voltage value, perform arithmetic amplification on the voltage value to be output, and determine the output voltage value; the first end of the first operational amplifier 32 is connected to the voltage input port, the second end of the first operational amplifier 32 is connected to the fourth end of the first main control chip 11, and the third end of the first operational amplifier 32 is connected to the second end of the second operational amplifier 31, which is used to enable the first main control chip 11 and turn on the first DC-DC conversion circuit 1 when the output voltage value is greater than or equal to the reference voltage value; when the output voltage value is greater than or equal to the reference voltage value, the first main control chip 11 is turned off and the first DC-DC conversion circuit 1 is turned off.

[0038] In the embodiment, the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4 divide the 24V voltage, and the divided voltage value is used as the reference voltage value of the first operational amplifier 32; the second operational amplifier 31 obtains the first sampling voltage value on the left side and the second sampling voltage value on the right side of the sampling resistor R5, determines that the voltage difference between the first sampling voltage value and the second sampling voltage value is the voltage value to be output, and the voltage difference is related to the output current of the second DC-DC conversion circuit 2, and performs arithmetic amplification on the voltage value to be output to determine the output voltage value, and sends the output voltage value to the first operational amplifier 32.

[0039] After the first operational amplifier 32 obtains the output voltage value and the reference voltage value, it determines the magnitude relationship between the output voltage value and the reference voltage value. If the output voltage value is greater than or equal to the reference voltage value, it is considered that the current load power is large and the vehicle is in the normal power-on state. Then, an enabling signal is sent to the first main control chip 11. After receiving the enabling signal, the first main control chip 11 is awakened and turns on the first DC-DC conversion circuit 1. The first DC-DC conversion circuit 1 and the second DC-DC conversion circuit 2 are connected in parallel to jointly perform voltage conversion and output a preset 12V voltage to supply power to the 12V load. If the output voltage value is less than the reference voltage value, it is considered that the current load power is small and the vehicle is in the power-off state. Then, the first main control chip 11 is turned off to turn off the first DC-DC conversion circuit 1, and only the second DC-DC conversion circuit 2 performs voltage conversion to output a preset 12V voltage to supply power to the 12V load.

[0040] According to the DC-DC conversion circuit 10 of the embodiment of the present invention, two different voltage conversion circuits are used in combination to cope with different load powers in the scenarios of vehicle power-on and power-off, that is, the first DC-DC conversion circuit 1 and the second DC-DC conversion circuit 2. The magnitude relationship between the reference voltage value of the control circuit 3 and the output voltage value of the second DC-DC conversion circuit 2 is determined. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit 1 is turned on. The first DC-DC conversion circuit 1 and the second DC-DC conversion circuit 2 are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit 1 is turned off, and only the second DC-DC conversion circuit 2 performs voltage conversion to output a preset voltage to supply power to the load. By turning off the first DC-DC conversion circuit 1 when the load power is relatively low through the control circuit 3, the power consumption of the first DC-DC conversion circuit 1 itself is reduced, and only the second DC-DC conversion circuit 2 is used to supply power to the low-power load, improving the power conversion efficiency under low-power loads.

[0041] The following combines Figure 3 to give an example of the control method of the DC-DC conversion circuit of the embodiment of the present invention.

[0042] Such as Figure 3 shown, the control method of the DC-DC conversion circuit of the embodiment of the present invention at least includes steps S1 - step S3.

[0043] Step S1, obtain the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit.

[0044] Step S2, turn on or off the first DC-DC conversion circuit according to the output voltage value and the reference voltage value.

[0045] In an embodiment, the first DC-DC conversion circuit may be a Buck circuit, and the second DC-DC conversion circuit may be an LDO circuit. After obtaining the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit, the magnitude relationship between the output voltage value and the reference voltage value is judged. If the output voltage value is greater than or equal to the reference voltage value, it is considered that the current load power is large and the vehicle is in a normal power-on state. Then the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset 12V voltage to supply power to the 12V load. If the output voltage value is less than the reference voltage value, it is considered that the current load power is small and the vehicle is in a power-off state. Then the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion to output a preset 12V voltage to supply power to the 12V load, avoiding the problem that the conversion efficiency of the first DC-DC conversion circuit is relatively low when the load power is relatively low.

[0046] According to the control method of the DC-DC conversion circuit according to the embodiment of the present invention, two different voltage conversion circuits are used in combination to cope with different load powers in the vehicle power-on and power-off scenarios, that is, the first DC-DC conversion circuit and the second DC-DC conversion circuit. The magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit is determined. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion to output a preset voltage to supply power to the load. By turning off the first DC-DC conversion circuit when the load power is relatively low through the control circuit, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the low-power load, improving the power conversion efficiency under low-power loads.

[0047] In some embodiments, the first DC-DC conversion circuit includes a first main control chip. Turning on or off the first DC-DC conversion circuit according to the output voltage value and the reference voltage value includes: when the output voltage value is greater than or equal to the reference voltage value, enabling the first main control chip to turn on the first DC-DC conversion circuit; when the output voltage value is greater than or equal to the reference voltage value, turning off the first main control chip to turn off the first DC-DC conversion circuit.

[0048] In an embodiment, the first main control chip mainly controls the periodic on and off of the first semiconductor device and the second semiconductor device in the first DC-DC conversion circuit, receives an input voltage of 24V, turns on the first semiconductor device and turns off the second semiconductor device, connects to the inductor, and charges the inductor. When the inductor is fully charged, the voltage divided at the inductor is 12V to output a preset voltage of 12V; after the inductor is fully charged, the first semiconductor device is turned off and the second semiconductor device is turned on, and the inductor L outputs a preset voltage of 12V to discharge the 12V load; after the power of the inductor is used up, the first semiconductor device is turned on again and the second semiconductor device is turned off. The first DC-DC conversion circuit is mainly used for voltage conversion in the case of high-power loads.

[0049] In some embodiments, the second DC-DC conversion circuit includes a sampling resistor to obtain the output voltage value of the second DC-DC conversion circuit, including: obtaining the first sampling voltage value and the second sampling voltage value of the sampling resistor; determining the output voltage value according to the first sampling voltage value and the second sampling voltage value.

[0050] In an embodiment, obtain the first sampling voltage value on the left side and the second sampling voltage value on the right side of the sampling resistor R5, determine that the voltage difference between the first sampling voltage value and the second sampling voltage value is the voltage value to be output, and the voltage difference is related to the output current of the second DC-DC conversion circuit, and perform operational amplification on the voltage value to be output to determine the output voltage value.

[0051] According to the control method of the DC-DC conversion circuit according to the embodiment of the present invention, two different voltage conversion circuits are combined to cope with different load powers in the scenarios of vehicle power-on and power-off, that is, the first DC-DC conversion circuit and the second DC-DC conversion circuit. Determine the magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit. When the output voltage value is greater than or equal to the reference voltage value, turn on the first DC-DC conversion circuit. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load; when the output voltage value is less than the reference voltage value, turn off the first DC-DC conversion circuit, and only the second DC-DC conversion circuit performs voltage conversion and outputs a preset voltage to supply power to the load. By controlling the circuit to turn off the first DC-DC conversion circuit when the load power is relatively low, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the small-power load, improving the power conversion efficiency under small-power loads.

[0052] Next, refer to Figure 4 Describe the control device 100 of the DC-DC conversion circuit according to the embodiment of the present invention.

[0053] As Figure 4As shown in the figure, the control device 100 of the DC-DC conversion circuit according to an embodiment of the present invention includes: an acquisition module 101 and a control module 102, where, The acquisition module 101 is configured to acquire the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit; the control module 102 is configured to turn on or off the first DC-DC conversion circuit according to the output voltage value and the reference voltage value.

[0054] In the embodiment, the first DC-DC conversion circuit may be a Buck circuit, and the second DC-DC conversion circuit may be an LDO circuit. After the control module 102 acquires the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit, it determines the magnitude relationship between the output voltage value and the reference voltage value. If the output voltage value is greater than or equal to the reference voltage value, it is considered that the current load power is large and the vehicle is in the normal power-on state, then the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage of 12V to supply power to the 12V load; if the output voltage value is less than the reference voltage value, it is considered that the current load power is small and the vehicle is in the power-off state, then the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion to output a preset voltage of 12V to supply power to the 12V load, avoiding the problem that the conversion efficiency of the first DC-DC conversion circuit is relatively low when the load power is relatively low.

[0055] According to the control device 100 of the DC-DC conversion circuit according to an embodiment of the present invention, two different voltage conversion circuits are used in combination to cope with different load powers in the vehicle power-on and power-off scenarios, that is, the first DC-DC conversion circuit and the second DC-DC conversion circuit. Determine the magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load; when the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion to output a preset voltage to supply power to the load. By turning off the first DC-DC conversion circuit when the load power is relatively low through the control circuit, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the low-power load, improving the power conversion efficiency under low-power loads.

[0056] Next, refer to Figure 5 to describe the vehicle 110 according to an embodiment of the present invention.

[0057] As Figure 5As shown, the vehicle 110 according to an embodiment of the present invention includes the control device 100 of the DC-DC conversion circuit in the above embodiment.

[0058] For the vehicle 110 according to an embodiment of the present invention, two different voltage conversion circuits are combined to cope with different load powers in the scenarios of vehicle power-on and power-off, namely, the first DC-DC conversion circuit and the second DC-DC conversion circuit. The magnitude relationship between the reference voltage value of the control circuit and the output voltage value of the second DC-DC conversion circuit is determined. When the output voltage value is greater than or equal to the reference voltage value, the first DC-DC conversion circuit is turned on. The first DC-DC conversion circuit and the second DC-DC conversion circuit are connected in parallel to jointly perform voltage conversion and output a preset voltage to supply power to the load. When the output voltage value is less than the reference voltage value, the first DC-DC conversion circuit is turned off, and only the second DC-DC conversion circuit performs voltage conversion and outputs a preset voltage to supply power to the load. By controlling the circuit to turn off the first DC-DC conversion circuit when the load power is relatively low, the power consumption of the first DC-DC conversion circuit itself is reduced, and only the second DC-DC conversion circuit is used to supply power to the low-power load, thereby improving the power conversion efficiency under low-power loads.

[0059] The computer-readable storage medium according to an embodiment of the present invention will be described below.

[0060] A control program for the DC-DC conversion circuit is stored on the computer-readable storage medium according to an embodiment of the present invention. When the control program for the DC-DC conversion circuit is executed by a processor, the control method for the DC-DC conversion circuit in the above embodiment is implemented.

[0061] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0062] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A DC-DC conversion circuit, characterized in that: include: a first DC-DC conversion circuit, wherein a first end of the first DC-DC conversion circuit is connected to a voltage input port, and a second end of the first DC-DC conversion circuit is connected to a voltage output port, for receiving an input voltage and outputting a preset voltage; a second DC-DC conversion circuit, wherein a first terminal of the second DC-DC conversion circuit is connected to the voltage input port, and a third terminal of the second DC-DC conversion circuit is connected to the voltage output port, and is used to receive an input voltage and output a preset voltage; A control circuit, wherein a first end of the control circuit is connected to the voltage input port, a second end of the control circuit is connected to a third end of the first DC-DC conversion circuit, and the third end of the control circuit is connected to a second end of the second DC-DC conversion circuit, and is used to turn on or off the first DC-DC conversion circuit according to a reference voltage value of the control circuit and an output voltage value of the second DC-DC conversion circuit.

2. The DC-DC conversion circuit according to claim 1, characterized in that: The second DC-DC conversion circuit comprises: A second main control chip, wherein a first end of the second main control chip is connected to the voltage input port; a sampling resistor, one end of which is connected to the second end of the second main control chip, and the other end of which is connected to the voltage input port; A first voltage regulating resistor, one end of which is connected to the second end of the second main control chip; A second voltage regulating resistor, one end of which is connected to the third end of the second main control chip and the other end of the first voltage regulating resistor, and the other end of the second voltage regulating resistor is grounded, for receiving an input voltage, and outputting a preset voltage according to a reference voltage value of the second main control chip, a first resistance value of the first voltage regulating resistor, and a second resistance value of the second voltage regulating resistor.

3. The DC-DC conversion circuit according to claim 2, characterized in that: The first DC-DC conversion circuit comprises: A first main control chip, wherein a first end of the first main control chip is connected to the voltage input port; A first semiconductor device, wherein a first end of the first semiconductor device is connected to the voltage input port, and a third end of the first semiconductor device is connected to a second end of the first main control chip; a second semiconductor device, wherein a first end of the second semiconductor device is connected to a third end of the first main control chip, a second end of the second semiconductor device is connected to the voltage input port, and a third end of the second semiconductor device is grounded; An inductor, one end of which is connected to the first semiconductor device and the second semiconductor device, and the other end of which is connected to the voltage output port, for receiving an input voltage, turning on the first semiconductor device and turning off the second semiconductor device, or turning off the first semiconductor device and turning on the second semiconductor device, to output a preset voltage.

4. The DC-DC conversion circuit according to claim 3, characterized in that: The control circuit comprises: A first voltage-dividing resistor, one end of which is connected to the voltage input port; a second voltage-dividing resistor, one end of the second voltage-dividing resistor being connected to the other end of the first voltage-dividing resistor, and the other end of the second voltage-dividing resistor being grounded; a second operational amplifier, wherein a first end of the second operational amplifier is connected to the voltage input port, a third end of the second operational amplifier is connected to the other end of the sampling resistor, and a fourth end of the second operational amplifier is connected to one end of the sampling resistor, and is used to obtain a first sampling voltage value and a second sampling voltage value of the sampling resistor, determine a voltage value to be output according to the first sampling voltage value and the second sampling voltage value, and perform operational amplification on the voltage value to be output to determine the output voltage value; a first operational amplifier, wherein a first end of the first operational amplifier is connected to the voltage input port, a second end of the first operational amplifier is connected to a fourth end of the first main control chip, and a third end of the first operational amplifier is connected to a second end of the second operational amplifier, and is used for enabling the first main control chip and turning on the first DC-DC conversion circuit when the output voltage value is greater than or equal to the reference voltage value; and shutting down the first main control chip and turning off the first DC-DC conversion circuit when the output voltage value is greater than or equal to the reference voltage value.

5. A control method for a DC-DC conversion circuit, characterized in that: include: Acquire a reference voltage value of the control circuit and an output voltage value of the second DC-DC conversion circuit; The first DC-DC conversion circuit is turned on or off according to the output voltage value and the reference voltage value.

6. The DC-DC conversion circuit according to claim 5, characterized in that: The first DC-DC conversion circuit includes a first main control chip, and the first DC-DC conversion circuit is turned on or off according to the output voltage value and the reference voltage value, including: When the output voltage value is greater than or equal to the reference voltage value, enabling the first main control chip to turn on the first DC-DC conversion circuit; When the output voltage value is greater than or equal to the reference voltage value, the first main control chip is turned off to shut down the first DC-DC conversion circuit.

7. The DC-DC conversion circuit according to claim 5, characterized in that: The second DC-DC conversion circuit includes a sampling resistor, and obtaining an output voltage value of the second DC-DC conversion circuit includes: Acquire a first sampling voltage value and a second sampling voltage value of the sampling resistor; The output voltage value is determined according to the first sampled voltage value and the second sampled voltage value.

8. A control device for a DC-DC conversion circuit, characterized in that: include: An acquisition module, used to acquire a reference voltage value of the control circuit and an output voltage value of the second DC-DC conversion circuit; A control module is used to turn on or off the first DC-DC conversion circuit according to the output voltage value and the reference voltage value.

9. A vehicle, characterized in that: include: The control device of the DC-DC conversion circuit as claimed in claim 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a control program for a DC-DC conversion circuit, and when the control program for the DC-DC conversion circuit is executed by a processor, the control method for a DC-DC conversion circuit according to any one of claims 5 to 7 is implemented.

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