CN110758278B - Power supply method, power supply device, vehicle-mounted air conditioner and computer-readable storage medium - Google Patents
Power supply method, power supply device, vehicle-mounted air conditioner and computer-readable storage medium Download PDFInfo
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- CN110758278B CN110758278B CN201911063125.8A CN201911063125A CN110758278B CN 110758278 B CN110758278 B CN 110758278B CN 201911063125 A CN201911063125 A CN 201911063125A CN 110758278 B CN110758278 B CN 110758278B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/005—Electro-mechanical devices, e.g. switched
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
Abstract
The invention provides a power supply method, a power supply device, a vehicle-mounted air conditioner and a computer readable storage medium, wherein the power supply method comprises the following steps: determining the load capacity of a power supply control circuit; and controlling the switching device to work in an intermittent burst mode according to the load amount, and adjusting the duty ratio of the switching device. According to the power supply method provided by the invention, when the load is in light load operation, the power supply control circuit can stabilize the output voltage and reduce the switching times of the switching device in unit time, so that the problem that the working efficiency of the circuit is reduced due to the increase of the voltage at two ends of the switching device when the power supply control circuit enters a light load mode is solved, the switching loss in light load is effectively reduced, and the condition that the low-voltage and low-cost switching device cannot be adopted in the related technology is avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a power supply method, a power supply device, a vehicle-mounted air conditioner and a computer readable storage medium.
Background
In the existing power supply circuit technology, under a light load state, the control pulse width of a driving tube is obtained according to circuit feedback, if the output voltage is too high, the output pulse width is reduced, and if the output voltage is too low, the output pulse width is reduced. However, when the switch tube works in a light load state, the voltage at two ends of the switch tube is consistent with the target output voltage, which causes the following two problems:
1. the circuit working efficiency is reduced, and the switching loss is large;
2. low voltage, low cost switching tubes cannot be used.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention proposes a power supply method.
A second aspect of the present invention is to provide a power supply apparatus.
A third aspect of the present invention is to provide a vehicle air conditioner.
A fourth aspect of the invention is directed to a computer-readable storage medium.
In view of the above, according to a first aspect of the present invention, there is provided a power supply method for a power supply control circuit, the power supply control circuit includes at least one switching device, the switching device is in an on state, the control circuit stores power input by a grid system, the switching device is in an off state, and the control circuit outputs the stored power to a load, the power supply method includes: determining the load capacity of a power supply control circuit; and controlling the switching device to work in an intermittent burst mode according to the load amount, and adjusting the duty ratio of the switching device.
The power supply method provided by the invention determines the load capacity of the power supply control circuit according to the operation parameter signal of the load, namely the voltage required by the load operation, further determines the duty ratio of the switching device according to the load capacity, controls the switching device of the power supply control circuit to work in an intermittent Burst Mode (Burst Mode) when the operation parameter signal is light load (low load), and adjusts the duty ratio of the switching device, so that the power supply control circuit can stably output voltage, and reduces the switching times of the switching device in unit time, thereby solving the problem that the working efficiency of the circuit is reduced due to the increase of the voltage at two ends of the switching device when the power supply control circuit enters the light load Mode, effectively reducing the switching loss in the light load, and avoiding the condition that the low-voltage and low-cost switching device cannot be adopted in the related technology.
The intermittent burst mode refers to that the switching device intermittently operates according to a specified period.
In addition, according to the power supply method in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in the above technical solution, further, controlling the switching device to operate in an intermittent burst mode according to a load amount, and adjusting a duty ratio of the switching device specifically includes: determining the duty ratio of a switching device according to the load; comparing the relationship between the duty ratio and the light-load duty ratio interval; and controlling the switching device to work in an intermittent burst mode according to the relation between the duty ratio and the light-load duty ratio interval, and adjusting the duty ratio of the switching device.
In the technical scheme, the duty ratio of the switching device is determined according to the load, the switching frequency of the switching device is determined according to the relation between the duty ratio and the light-load duty ratio interval, if the switching frequency is low, the switching device is controlled to work in an intermittent burst mode, and the switching device is adjusted to work in a fixed duty ratio, so that the power supply control circuit can continuously output voltage under the condition of light load, the switching times of the switching device in unit time are reduced, the voltage requirement of the load is guaranteed, and the working efficiency of the power supply control circuit is improved.
In any of the above technical solutions, further, according to a relationship between a duty cycle and a light-load duty cycle interval, controlling the switching device to operate in an intermittent burst mode, and adjusting the duty cycle of the switching device specifically includes: judging that the duty ratio meets a light-load duty ratio interval, and controlling a switching device to work in an intermittent burst mode and a preset duty ratio; the upper limit of the light-load duty cycle interval is less than or equal to the preset duty cycle, and the lower limit is greater than 0.
In the technical scheme, the light-load duty cycle interval is as follows: the light duty ratio is more than 0 and less than or equal to the preset duty ratio, when the duty ratio meets the light duty ratio interval, the switching device is indicated to work at a lower switching frequency, in order to ensure that the output voltage of the power supply control circuit can meet the load requirement, the switching device is controlled to work in an intermittent burst mode and the preset duty ratio, the power supply control circuit is ensured to continuously output the voltage while the switching loss is reduced, the problem that the low-voltage and low-cost switching device cannot be adopted is solved, and the preset duty ratio can be reasonably set according to the historical operating data of the power supply control circuit.
In any of the above technical solutions, further, the method further includes: judging that the duty ratio exceeds a light-load duty ratio interval, and comparing the duty ratio with a preset duty ratio; controlling the switching device to work at the duty ratio based on the duty ratio being larger than the preset duty ratio; and controlling the switching device to be switched off based on the duty ratio being smaller than the preset duty ratio.
In the technical scheme, if the duty ratio exceeds the light-load duty ratio interval, namely the duty ratio of the switching device is 0 or greater than the preset duty ratio, if the duty ratio is greater than the preset duty ratio, the load is in a working state, the load needs to be driven to work by higher voltage, the switching device is controlled to work by the duty ratio, if the duty ratio is less than the preset duty ratio, namely the duty ratio is 0, the load is in a standby mode, the switching device is controlled to be cut off, namely the power supply control circuit is closed, so that the working requirements of the load in different states are met, and the product practicability is improved.
In any of the above technical solutions, further determining a load of the control circuit specifically includes: acquiring an operation parameter signal of a load; and determining the load amount according to the operation parameter signal.
In the technical scheme, the operation parameter signal of the load is acquired, the operation state of the load is judged according to the operation parameter signal of the load, the voltage required by the load is determined according to different operation states, namely the load capacity of the power supply control circuit, and then the duty ratio of the switching device is determined according to the load capacity, so that the voltage is stably output according to the changed duty ratio of the switching device.
In any of the above technical solutions, further determining a load amount according to the operation parameter signal specifically includes: judging that the operation parameter signal is a heavy load, and acquiring a target working voltage of at least one load; and selecting the maximum voltage value in the target working voltage of at least one load as the load quantity.
In the technical scheme, if the operation parameter signal is a heavy load, the voltages required by the work of all the loads, namely the target work voltages, are determined, and considering that the power supply control circuit can simultaneously supply power to a plurality of loads, but the voltage values required by different loads are different, the load capacity output by the power supply control circuit can meet the requirements of all the loads by selecting the maximum voltage value in the target work voltages of the loads as the load capacity.
In any of the above technical solutions, further, determining a load according to the operation parameter signal specifically includes: judging that the operation parameter signal is light load, acquiring the withstand voltage between electrodes of the switching device, and determining the load according to the withstand voltage and a preset coefficient; and judging that the running parameter signal is no-load and the load is 0.
In the technical scheme, if the operation parameter signal is light load, the withstand voltage between the electrodes of the switching device is obtained, and the load capacity is determined according to the withstand voltage and a preset coefficient, wherein the preset coefficient can be reasonably set according to the equipment parameters and the historical working data of the load; if the operation parameter signal is no load, the load is in a standby state, and the load does not need to work, and the load amount is 0.
Specifically, the load amount is determined according to the withstand voltage and a preset coefficient, and the following formula is adopted:
U0＝K×UDS
wherein, U0Representing the amount of load, K representing a predetermined coefficient, UDSIndicating the withstand voltage.
In practical applications, the switching device may have various options, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) may be used. When the IGBT is adopted, each switching device comprises a triode and a diode, the collector of the triode is connected with the cathode of the diode to form the first end of the switching device, the emitter of the triode is connected with the anode of the diode to form the second end of the switching device, and the withstand voltage between the electrodes is the withstand voltage between the collector and the emitter; when the MOSFET is adopted, each switching device comprises an MOS tube and a diode, the source electrode of the MOS tube is connected with the cathode of the diode to form a first end of the switching device, the drain electrode of the MOS tube is connected with the anode of the diode to form a second end of the switching device, and the withstand voltage between the electrodes is the withstand voltage between the drain electrode and the source electrode.
In any of the above technical solutions, further, the obtaining of the target operating voltage of at least one load specifically includes: acquiring equipment parameters of a load; determining a target working voltage according to the equipment parameters; determining a target working voltage according to equipment parameters, and adopting the following formula:
wherein U represents a target operating voltage, n represents a rotation speed of a load,
the motor air gap main flux represents a load, R represents a rotational speed armature circuit resistance of the load, I represents an armature current of the load, and Ce is a constant.
In the technical scheme, the target working voltage of the load is calculated according to the equipment parameters (the rotating speed, the main magnetic flux of the air gap of the motor, the rotating speed armature loop resistance and the armature current) of the load, so that the voltages required by different loads are accurately obtained, the maximum value of the target working voltages of a plurality of loads is selected as the load capacity of the power supply control circuit, and the load capacity output by the power supply control circuit can meet the requirements of all the loads.
According to a second aspect of the present invention, there is provided a power supply apparatus, comprising a memory in which a computer program is stored and a processor for executing the computer program to implement the power supply method of any one of the above. Therefore, the power feeding device has all the advantages of any one of the power feeding methods.
According to a third aspect of the present invention, there is provided a vehicle air conditioner including: a load; the above power supply device; the power supply control circuit is controlled by the power supply device and is provided with at least one switching device, the switching device is in a conducting state, the control circuit stores electric quantity input by a power grid system, the switching device is in a stopping state, and the control circuit outputs the stored electric quantity to a load.
The vehicle-mounted air conditioner provided by the invention can determine the load capacity of the power supply control circuit according to the operation parameter signal of the load, namely the voltage required by the load operation, further determine the duty ratio of the switching device according to the load capacity, and when the operation parameter signal is light load (low load), the switching device of the power supply control circuit is controlled to work in an intermittent Burst Mode (Burst Mode), and the duty ratio of the switching device is adjusted, so that the power supply control circuit can stably output the voltage, and the switching times of the switching device in unit time are reduced, thereby solving the problem that the working efficiency of the circuit is reduced due to the increase of the voltage at two ends of the switching device when the power supply control circuit enters the light load Mode, effectively reducing the switching loss in the light load, avoiding the condition that the low-voltage and low-cost switching device cannot be adopted in the related technology, and further improving the practicability of the.
In particular, the load comprises a compressor and/or a fan.
According to a fourth aspect of the present invention, a computer-readable storage medium is proposed, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the power supply method according to any one of the above. The computer readable storage medium thus includes all the advantageous effects of any of the above-described power supply methods.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow chart of a power supply method according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of a power supply method according to another embodiment of the invention;
FIG. 3 is a schematic flow chart of a power supply method according to another embodiment of the invention;
FIG. 4 is a schematic flow chart of a power supply method according to another embodiment of the invention;
FIG. 5 shows a power control circuit configuration diagram of a specific embodiment of the present invention;
FIG. 6 illustrates a waveform of the duty cycle of the switching device under heavy load in an exemplary embodiment of the invention;
FIG. 7 illustrates a waveform of the duty cycle of the switching device under light load in an exemplary embodiment of the invention;
fig. 8 shows a schematic block diagram of a power supply apparatus according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A power supply method, a power supply apparatus 800 according to some embodiments of the present invention are described below with reference to fig. 1 to 8.
Example one
As shown in fig. 1, according to an embodiment of the first aspect of the present invention, there is provided a power supply method, including:
and 104, controlling the switching device to work in an intermittent burst mode according to the load amount, and adjusting the duty ratio of the switching device.
The power supply method provided by this embodiment determines the load amount of the power supply control circuit, that is, the voltage required by the load operation, according to the load amount, and further determines the duty ratio of the switching device, and when the operation parameter signal is a light load (low load), controls the switching device of the power supply control circuit to operate in a Burst Mode (Burst Mode), and adjusts the duty ratio of the switching device, so that the power supply control circuit can stably output the voltage, and reduces the switching times of the switching device in a unit time, thereby solving the problem that the operating efficiency of the circuit is reduced due to the voltage increase of the two ends of the switching device when the power supply control circuit enters the light load Mode, effectively reducing the switching loss in the light load, and avoiding the situation that the low-voltage and low-cost switching device cannot be used in the related art.
The intermittent burst mode refers to that the switching device intermittently operates according to a specified period.
Example two
As shown in fig. 2, according to an embodiment of the present invention, there is provided a power supply method including:
and step 210, controlling the switching device to work in an intermittent burst mode according to the relation between the duty ratio and the light-load duty ratio interval, and adjusting the duty ratio of the switching device.
In the embodiment, an operation parameter signal of the load is obtained, the operation state of the load is judged according to the operation parameter signal of the load, the voltage required by the load is determined according to different operation states, namely the load capacity of the power supply control circuit, the duty ratio of the switching device is further determined according to the load capacity, the relation between the duty ratio and the light-load duty ratio interval is compared, if the duty ratio of the switch is low, the switching device is controlled to work in an intermittent burst mode, and the switching device is adjusted to work in a fixed duty ratio, so that the power supply control circuit can continuously output the voltage under the light-load condition, the voltage requirement of the load is ensured while the switching times of the switching device in unit time is reduced, and the working efficiency of.
EXAMPLE III
As shown in fig. 3, according to an embodiment of the present invention, there is provided a power supply method including:
and step 314, controlling the switching device to be cut off.
The upper limit of the light-load duty cycle interval is less than or equal to the preset duty cycle, and the lower limit is greater than 0.
In this embodiment, if the duty ratio meets the light-load duty ratio interval, it is indicated that the switching device operates at a lower switching frequency at this time, in order to ensure that the output voltage of the power supply control circuit can meet the load demand, the switching device is controlled to operate in an intermittent burst mode and a preset duty ratio, and while the switching loss is reduced, the power supply control circuit is ensured to continuously output voltage, so that the problem that a low-voltage and low-cost switching device cannot be adopted is solved, wherein the preset duty ratio can be reasonably set according to the historical operating data of the power supply control circuit. If the duty ratio exceeds the light-load duty ratio interval, namely the duty ratio of the switching device is 0 or greater than the preset duty ratio, if the duty ratio is greater than the preset duty ratio, the load is in a working state, and the load needs to be driven to work by higher voltage, the switching device is controlled to work by the duty ratio, if the duty ratio is less than the preset duty ratio, namely the duty ratio is 0, the load is in a standby mode, the switching device is controlled to be cut off, namely the power supply control circuit is closed, so that the working requirements of the load in different states are met, and the product practicability is improved.
Example four
As shown in fig. 4, according to an embodiment of the present invention, there is provided a power supply method including:
and step 422, controlling the switching device to be cut off.
In this embodiment, if the operation parameter signal is a heavy load, voltages required by the operation of all loads, that is, target operating voltages, are determined, and considering that the power supply control circuit can simultaneously supply power to a plurality of loads but different loads require different voltage values, the maximum voltage value in the target operating voltages of the loads is selected as a load amount, so as to ensure that the load amount output by the power supply control circuit can meet the requirements of all the loads; if the operation parameter signal is light load, obtaining the withstand voltage between the electrodes of the switching device, and determining the load capacity according to the withstand voltage and a preset coefficient, wherein the preset coefficient can be reasonably set according to the equipment parameters and the historical working data of the load; if the operation parameter signal is no load, the load is in a standby state, and the load does not need to work, and the load amount is 0.
Specifically, the load amount is determined according to the withstand voltage and a preset coefficient, and the following formula is adopted:
U0＝K×UDS
wherein, U0Representing the amount of load, K representing a predetermined coefficient, UDSIndicating the withstand voltage.
In addition, in practical applications, the switching device may have various options, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) may be used. When the IGBT is adopted, each switching device comprises a triode and a diode, the collector of the triode is connected with the cathode of the diode to form the first end of the switching device, the emitter of the triode is connected with the anode of the diode to form the second end of the switching device, and the withstand voltage between the electrodes is the withstand voltage between the collector and the emitter; when the MOSFET is adopted, each switching device comprises an MOS tube and a diode, the source electrode of the MOS tube is connected with the cathode of the diode to form a first end of the switching device, the drain electrode of the MOS tube is connected with the anode of the diode to form a second end of the switching device, and the withstand voltage between the electrodes is the withstand voltage between the drain electrode and the source electrode.
Further, acquiring a target operating voltage of at least one load specifically includes: acquiring equipment parameters of a load; determining a target working voltage according to the equipment parameters; determining a target working voltage according to equipment parameters, and adopting the following formula:
wherein U represents a target operating voltage, n represents a rotation speed of a load,
the motor air gap main flux represents a load, R represents a rotational speed armature circuit resistance of the load, I represents an armature current of the load, and Ce is a constant.
EXAMPLE five
According to an embodiment of the present invention, a power supply method is provided for a power supply control circuit shown in fig. 5, the power supply control circuit supplies power to a compressor and a dc fan.
The power supply control circuit specifically comprises a first inductor L1, a first capacitor C1, a first diode D1, a second inductor L2, a second capacitor C2, a second diode D2, a third diode D3, a first switching device Q1, a second switching device Q2, an electrolytic capacitor E, a first voltage stabilizing diode DZ1 and a second voltage stabilizing diode DZ 2; the common end between the first inductor L1 and the second inductor L2 is connected to the input end of the power supply control circuit; one end of the first capacitor C1 is connected to the first inductor L1, and the other end of the first capacitor C1 is connected to the second inductor L2 through the second diode D2; one end of a second capacitor C2 is connected to the second inductor L2, and the other end of the second capacitor C2 is connected to the first inductor L1 through a first diode D1; the first switching device Q1 is connected to the common terminal between the first capacitor C1 and the first inductor L1; the second switching device Q2 is connected to the common terminal between the second capacitor C2 and the second inductor L2; the third diode D3 is connected to the common terminal between the first capacitor C1 and the second capacitor C2; the common terminal among the electrolytic capacitor E, the first switching device Q1 and the second switching device Q2 is connected to the output terminal of the circuit, the first switching device Q1 is connected in parallel with the first zener diode DZ1, and the second switching device Q2 is connected in parallel with the second zener diode DZ 2. The switching device in fig. 5 of this embodiment is illustrated by taking a MOSFET as an example.
Specifically, when the load starts up, namely enters a heavy-load mode, the output voltage U of the circuit0The control is performed according to the following relationship: required voltage of compressor
Wherein n ispIs the compressor speed; rpIs a compressor armature loop resistance; i ispIs the compressor armature current;
is the air gap main magnetic flux of the compressor motor; ce is constant and is associated with the motor structure and is provided by the supplier of the compressor. Voltage required by DC fan
Wherein n isFThe rotating speed of the direct current fan is set; rFIs straightA blower armature return resistance; fpIs the armature current of the direct current fan;
is the air gap main magnetic flux of the DC fan motor; ce is constant and is related to the motor structure and is provided by the supplier of the dc fan. U shape0Get UpAnd UFThe one with the larger middle value, according to U0Determining the duty ratio of a switching device in the power supply control circuit, and controlling the switching device to operate according to the duty ratio, wherein the waveform of the duty ratio of the switching device is as shown in fig. 6, when the first switching device Q1 is turned on, the power supply voltage at the input end of the circuit is loaded at two ends of the first inductor L1, the current of the first inductor L1 starts to rise, and the electric energy is stored in the first inductor L1; when the second switching device Q2 is turned on, the supply voltage at the input end of the circuit is loaded across the second inductor L2, the current of the second inductor L2 starts to rise, and the electric energy is stored in the second inductor L2; when the first switching device Q1 is turned off and the second switching device Q2 is turned on, the energy stored in the first inductor L1 starts to be discharged, and there are two discharging paths, one is to discharge to the electrolytic capacitor E through the first capacitor C1 and the third diode D3, and the other is to reach the second capacitor C2 through the first diode D1, and since the second switching device Q2 is turned on, one end of the second capacitor C2 is connected to the ground, that is, the potential of the end is 0V, that is, the voltage across the second capacitor C2 is equal to the voltage loaded on the second switching device Q2; when the second switch device Q2 is turned off and the first switch device Q1 is turned on, the energy stored in the second inductor L2 starts to be discharged, and there are two discharging paths, one discharging path is to discharge the electrolytic capacitor E through the second capacitor C2 and the third diode D3, the other discharging path is to reach the first capacitor C1 through the second diode D2, and since the first switch device Q1 is turned on, one end of the first capacitor C1 is connected to the ground, that is, the potential of the end is 0V, that is, the voltage across the first capacitor C1 is consistent with the voltage loaded on the first switch device Q1, and further, since the second capacitor C2 already stores the electric energy discharged by the first inductor L1, the voltage loaded across the second switch device Q2 is the difference between the output voltage of the circuit and the voltage across the second capacitor C2, thereby reducing the voltage loaded on the second switch device Q2Similarly, after the first capacitor C1 stores the electric energy released by the second inductor L2, the first switching device Q1 is turned off again, and the voltage loaded across the first switching device Q1 is the difference between the output voltage of the power supply control circuit and the voltage across the first capacitor C1, so that the voltage loaded across the first switching device Q1 is reduced.
When the compressor and the direct current fan are both closed, the light-load mode is entered, and the output voltage U is controlled0＝K×UDS(K-0.8) wherein UDSThe withstanding voltage between the drain and the source of the switch tube. According to U0Determining the duty ratio of a switching device in the power supply control circuit, controlling the duty ratio to be equal to 0.5 when the duty ratio of the output pulse is less than 0.5 (preset duty ratio), and adopting a gap mode, wherein the duty ratio waveform of the switching device is shown in fig. 7.
And when the compressor and the direct current fan are in a standby state, the power supply control circuit is closed.
In this embodiment, the air conditioner power supply control circuit is controlled to solve the problems that when the circuit enters a low load, the voltage across the MOS transistor is increased, which results in a decrease in the circuit operating efficiency (an increase in the switching loss) and that a low-voltage and low-cost switching transistor cannot be used.
EXAMPLE six
As shown in fig. 8, according to an embodiment of the second aspect of the present invention, a power supply apparatus 800 is provided, which includes a memory 802, a processor 804, and a computer program stored on the memory 802 and executable on the processor 804, and when the processor 804 executes the computer program, the power supply method of any of the above embodiments is implemented. Therefore, the power supply apparatus 800 has all the advantages of the power supply method according to any of the above embodiments.
EXAMPLE seven
According to an embodiment of a third aspect of the present invention, a vehicle air conditioner, a load and a power supply control circuit in any one of the above embodiments are provided, wherein the power supply control circuit is configured to control a power supply signal to supply power to the load, specifically, the load is a fan and/or a compressor.
The vehicle-mounted air conditioner provided by the embodiment can determine the load capacity of the power supply control circuit according to the operation parameter signal of the load, namely the voltage required by the load operation, further determine the duty ratio of the switching device according to the load capacity, and when the operation parameter signal is light load (low load), control the switching device of the power supply control circuit to work in an intermittent Burst Mode (Burst Mode), and adjust the duty ratio of the switching device, so that the power supply control circuit can stably output the voltage, and reduce the switching times of the switching device in unit time, thereby solving the problem that the working efficiency of the circuit is reduced due to the increase of the voltage of two ends of the switching device when the power supply control circuit enters the light load Mode, effectively reducing the switching loss in the light load, avoiding the condition that the low-voltage and low-cost switching device cannot be adopted in the related technology, and further improving the practicability of the vehicle-.
Example eight
According to an embodiment of the fourth aspect of the present invention, a computer-readable storage medium is proposed, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the power supply method according to any one of the above. The computer readable storage medium thus includes all the advantageous effects of any of the above-described power supply methods.
In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A power supply method applied to a power supply control circuit, wherein the power supply control circuit includes at least one switching device, the switching device is in an on state, the control circuit stores power input by a power grid system, the switching device is in an off state, and the control circuit outputs the stored power to a load, the power supply method including:
determining the load capacity of the power supply control circuit;
controlling the switching device to work in an intermittent burst mode according to the load amount, and adjusting the duty ratio of the switching device;
controlling the switching device to operate in an intermittent burst mode according to the load amount, and adjusting a duty ratio of the switching device, specifically comprising:
determining the duty ratio of the switching device according to the load;
comparing the relationship between the duty ratio and the light-load duty ratio interval;
judging that the duty ratio meets the light-load duty ratio interval, and controlling the switching device to work in an intermittent burst mode and a preset duty ratio;
judging that the duty ratio exceeds the light-load duty ratio interval, and comparing the duty ratio with the preset duty ratio;
controlling the switching device to operate at the duty ratio based on the duty ratio being greater than the preset duty ratio;
controlling the switching device to be turned off based on the duty ratio being smaller than the preset duty ratio;
the upper limit of the light-load duty cycle interval is less than or equal to the preset duty cycle, and the lower limit is greater than 0.
2. The power supply method according to claim 1, wherein determining the load of the control circuit specifically comprises:
acquiring an operation parameter signal of the load;
and determining the load according to the operation parameter signal.
3. The power supply method according to claim 2, wherein determining the load according to the operation parameter signal specifically includes:
judging the operation parameter signal to be a heavy load, and acquiring a target working voltage of at least one load;
and selecting the maximum voltage value in the target working voltage of at least one load as the load amount.
4. The power supply method according to claim 2, wherein the determining the load amount according to the operation parameter signal further includes:
judging that the operation parameter signal is light load, acquiring the withstand voltage between the electrodes of the switching device, and determining the load according to the withstand voltage and a preset coefficient;
and judging that the operation parameter signal is no-load, and the load is 0.
5. The power supply method according to claim 3, wherein obtaining the target operating voltage of at least one of the loads specifically comprises:
acquiring equipment parameters of the load;
determining the target working voltage according to the equipment parameters;
wherein, the target working voltage is determined according to the equipment parameters by adopting the following formula:
wherein U represents the target operating voltage, n represents a rotation speed of the load,
the motor air gap main flux of the load is represented, R represents the rotating speed armature loop resistance of the load, I represents the armature current of the load, and Ce is a constant.
6. A power supply apparatus comprising a memory and a processor, the memory having a computer program stored therein, the processor when executing the computer program implementing:
the steps of the power supply method according to any one of claims 1 to 5.
7. An in-vehicle air conditioner, characterized by comprising:
a load;
the power supply device of claim 6;
the power supply control circuit is controlled by the power supply device, the control circuit is provided with at least one switch device, the switch device is in a conducting state, the control circuit stores electric quantity input by a power grid system, the switch device is in a stopping state, and the control circuit outputs the stored electric quantity to the load.
8. The vehicle air conditioner according to claim 7,
the load is a fan and/or a compressor.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the power supply method according to any one of claims 1 to 5.
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| CN201911063125.8A CN110758278B (en) | 2019-10-31 | 2019-10-31 | Power supply method, power supply device, vehicle-mounted air conditioner and computer-readable storage medium |
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| JP2000203359A (en) * | 1999-01-13 | 2000-07-25 | Nissan Motor Co Ltd | Operation control system |
| CN101503060B (en) * | 2009-01-23 | 2011-06-01 | 西安智源电气有限公司 | Heavy truck electric appliance load driving device based on PWM control |
| JP2012106677A (en) * | 2010-11-18 | 2012-06-07 | Yazaki Corp | Power supply control device |
| US10018172B2 (en) * | 2014-08-27 | 2018-07-10 | Visteon Global Technologies, Inc. | Providing a boost voltage with a transient operation |
| CN106797117B (en) * | 2014-10-30 | 2019-06-18 | 矢崎总业株式会社 | Power supply on vehicle control device and its control method |
| JP6691665B2 (en) * | 2016-08-05 | 2020-05-13 | 株式会社Ｇｓユアサ | Power storage device, power storage device control method, vehicle |
| JP6673317B2 (en) * | 2017-11-27 | 2020-03-25 | アンデン株式会社 | Load drive circuit |
| KR102485380B1 (en) * | 2017-11-30 | 2023-01-05 | 현대자동차주식회사 | Apparatus for controlling alternator of vehicle and method thereof |
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