CN110868061A

CN110868061A - Drive control circuit, method and device, air conditioning equipment and readable storage medium

Info

Publication number: CN110868061A
Application number: CN201911204463.9A
Authority: CN
Inventors: 北本学; 张杰楠; 文先仕
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-03-06

Abstract

The invention provides a drive control circuit, a method and a device, an air conditioning device and a readable storage medium, wherein the drive control circuit comprises: a power source; a power factor correction circuit connected to the power supply, the power factor correction circuit configured to receive a power supply signal of the power supply, the power factor correction circuit including a switching circuit, the power factor correction circuit configured to adjust a power factor of the drive control circuit and output the power supply signal to a load; the input detection unit is connected with the power supply and is configured to acquire an input electric signal parameter; the output detection unit is connected with the output end of the power factor correction circuit and is configured to acquire an output electric signal parameter; and the control device is connected with the detection circuit and the power factor correction circuit and is configured to adjust the duty ratio of the switching circuit according to the input electric signal parameter and the output electric signal parameter.

Description

Drive control circuit, method and device, air conditioning equipment and readable storage medium

Technical Field

The present invention relates to the technical field of a drive control circuit, and in particular, to a drive control circuit, a drive control method, a drive control apparatus, an air conditioning device, and a computer-readable storage medium.

Background

In the related art, a driving control circuit provided with a PFC (Power Factor Correction) circuit is controlled by a continuous PWM (Pulse-Width Modulation) signal. When the load of the driving control circuit is high, a good control effect can be obtained, and when the load is low, the continuous PWM signal can make the proportion of the conduction loss of the switching device to the total power become high, which finally results in the reduction of the operation efficiency.

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 invention proposes a drive control circuit.

A second aspect of the invention proposes a drive control method.

A third aspect of the invention proposes a drive control device.

A fourth aspect of the present invention provides an air conditioning apparatus.

A fifth aspect of the invention proposes a computer-readable storage medium.

In view of this, a first aspect of the present invention provides a drive control circuit, including: a power source; a power factor correction circuit connected to the power supply, the power factor correction circuit configured to receive a power supply signal of the power supply, the power factor correction circuit including a switching circuit, the power factor correction circuit configured to adjust a power factor of the drive control circuit and output the power supply signal to a load; the input detection unit is connected with the power supply and is configured to acquire an input electric signal parameter; the output detection unit is connected with the output end of the power factor correction circuit and is configured to acquire an output electric signal parameter; and the control device is connected with the detection circuit and the power factor correction circuit and is configured to adjust the duty ratio of the switching circuit according to the input electric signal parameter and the output electric signal parameter.

In the technical scheme, the drive control circuit realizes power factor correction by a power factor correction circuit, a switch circuit is arranged in the power factor correction circuit, and the switch circuit is controlled to switch. The driving control circuit is also provided with an input detection unit and an output detection unit which are respectively used for detecting input electric signal parameters and output electric signal parameters, the load condition of the driving control circuit can be accurately known according to the input electric signal parameters and the output electric signal parameters, and the duty ratio of the switching circuit is adjusted in real time according to the load condition, so that when the load is low, the reduction of the operation efficiency caused by the conduction loss of a switching device can be effectively avoided by a method for reducing the duty ratio of the switching circuit, and the operation efficiency of the driving control circuit is effectively improved.

In addition, the driving control circuit in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, the drive control circuit further includes: the inductive element is connected in series with the positive bus; and a capacitive element, a first end of the capacitive element being connected to the positive busbar and a second end of the capacitive element being connected to the negative busbar.

In this solution, the drive control circuit includes an inductive element and a capacitive element. Specifically, when the PWM control signal of the power factor correction circuit is turned on, the drive control circuit includes two states, one is an inductive element discharge state in which the power supply supplies power to the inductive element, the capacitive element, and the load. The other state is an inductive element charging state in which the power supply charges the inductive element and the capacitor supplies power to the load. By switching the two states, the power factor of the drive control circuit can be effectively adjusted.

In any of the above technical solutions, the input electrical signal parameters include input current and input voltage, and the output electrical signal parameters include output current and output voltage; the control device is configured to: determining a given current corresponding to the load according to the input current, the input voltage, the output current and the output voltage; a given duty cycle is determined from the given current and the duty cycle is adjusted to the given duty cycle.

In the technical scheme, an input detection unit detects a current value and/or a voltage value of a power supply signal output by a power supply and connected to an input end, and an output unit detects a current value and/or a voltage value of a power supply signal output to a load. When the input current value of the input side is smaller than the output current value of the output side, and/or the input voltage value of the input side is smaller than the output voltage value of the output side, the load is higher at the moment, and therefore the switching circuit is controlled to increase the duty ratio to meet the load requirement.

When the input current value of the input side is larger than the output current value of the output side and/or the input voltage value of the input side is larger than the output voltage value of the output side, the load is lower at the moment, so that the switching circuit is controlled to reduce the duty ratio, the reduction of the operation efficiency caused by the conduction loss of the switching device is avoided, and the operation efficiency of the drive control circuit is effectively improved.

The given current corresponding to the load quantity can be determined according to the input voltage, the input current, the output voltage and the output current, namely, the given current is output to the load through the driving control circuit, and the load operation requirement can be met. After the given current is determined, the given duty ratio of the switching circuit corresponding to the given current is further determined, the duty ratio of the switching circuit is adjusted to the given duty ratio, so that the conduction loss can be reduced on the premise of meeting the load requirement, and the operation efficiency is improved.

In any of the above technical solutions, the switching circuit includes: the first switch device is connected with the capacitive element in parallel, a first end of the first switch device is connected between the output end of the inductive element and the capacitive element, a second end of the first switch device is connected to the negative bus, and a control end of the first switch device is connected with the control device; the power factor correction circuit further includes: the unidirectional conducting device is connected in series with the positive bus, the input end of the unidirectional conducting device is connected with the common end of the inductive element and the first switch device, and the output end of the unidirectional conducting device is connected with the first end of the capacitive element; or the switch tube is connected in series with the positive bus, the first end of the switch tube is connected with the common end of the inductive element and the first switch device, the second end of the switch tube is connected with the first end of the capacitive element, and the control end of the switch tube is connected with the control device.

In the technical scheme, the power factor correction circuit is in a boost PFC circuit and comprises a switching circuit and a one-way conduction device. The unidirectional conducting device is connected in series with the positive bus, the switching circuit comprises a first switching device, and the power factor correction circuit is controlled by controlling the duty ratio of the first switching device. In some embodiments, the boost PFC circuit includes a switching circuit and a switching tube, and for the case of using the switching tube, the state of the switching tube is controlled by the control device.

Specifically, when the load is raised, the duty cycle of the first switching device is correspondingly increased to increase the power supplied to the load. When the load is reduced, the duty ratio of the first switching device is correspondingly reduced, the conduction loss of the switching device is reduced, and the operation efficiency of the driving control circuit is improved.

In any of the above technical solutions, the control device is further configured to: and controlling the first switching device to be conducted for a preset number of times according to the duty ratio in one period of the power supply signal.

In the technical scheme, for the boost PFC circuit, in the positive half cycle and the negative half cycle of the alternating current power supply signal, the switching device is controlled to be switched on according to the duty ratio, the duty ratio is in positive correlation with the load amount, the larger the load amount is, the higher the duty ratio is, the smaller the load amount is, and the smaller the duty ratio is.

In any of the above technical solutions, the switching circuit includes: the first end of the second switching device is connected with the output end of the inductive element, the second end of the second switching device is connected to the first end of the capacitive element, and the control end of the second switching device is connected with the control device; a third switching device, a first end of the third switching device is connected to the second end of the capacitive element part, a second end of the third switching device is connected to the common end of the inductive element and the second switching device, and a control end of the third switching device is connected with the control device; a first end of the fourth switching device is connected to the negative electrode end of the power supply, a second end of the fourth switching device is connected to the common end of the second switching device and the capacitive element, and a control end of the fourth switching device is connected with the control device; and a fifth switching device, a first terminal of the fifth switching device being connected to a common terminal of the third switching device and the capacitive element, a second terminal of the fifth switching device being connected to a first terminal of the fourth switching device, and a control terminal of the fifth switching device being connected to the control means.

In the technical scheme, the power factor correction circuit is in a totem-pole PFC circuit, wherein the switching circuit comprises a second switching device, a third switching device, a fourth switching device and a fifth switching device. The power correction of the totem-pole PFC circuit can be adjusted by adjusting the on-off of the second switching device, the third switching device, the fourth switching device and the fifth switching device.

In any of the above aspects, the control device is configured to: in the first half period of the power supply signal, the fourth switching device is controlled to be turned off, and the fifth switching device is controlled to be turned on; acquiring a zero-crossing signal of the power supply signal in the last half period, and controlling the second switching device and the third switching device to be alternately conducted according to a duty ratio after acquiring the zero-crossing signal and delaying for a preset time length; in the lower half period of the power supply signal, controlling the fourth switching device to be switched on and controlling the fifth switching device to be switched off; and acquiring a zero-crossing signal of the power supply signal in the next half period, and after acquiring the zero-crossing signal and delaying the preset time length, controlling the second switching device and the third switching device to be alternately conducted according to the duty ratio.

In the technical scheme, for the totem pole PFC circuit, the fourth switching device is controlled to be turned off and the fifth switching device is controlled to be turned on in the positive half cycle of the accessed alternating current signal. And after the voltage crosses the zero point and the preset time is delayed, the second switching device and the third switching device are alternately conducted for a preset number of times according to the duty ratio, the fifth switching device is controlled to be turned off and the fourth switching device is controlled to be conducted in the next half period of the alternating current signal, and after the voltage crosses the zero point and the preset time is prolonged, the second switching device and the third switching device are controlled to be alternately conducted for the preset number of times according to the duty ratio again.

The duty ratio is positively correlated with the load amount, the larger the load amount is, the higher the duty ratio is, the smaller the load amount is, and the smaller the duty ratio is.

In any one of the above technical solutions, the drive control circuit further includes: and the rectifying circuit is connected to the bus circuit, the input end of the rectifying circuit is configured to receive a power supply signal, and the output end of the rectifying circuit is connected with the input end of the inductive element.

In the technical scheme, for the load requiring direct current, a rectifying circuit is arranged to convert an alternating current power supply signal into a direct current power supply signal so as to meet the load requirement.

In any one of the above aspects, the drive control device includes: the control circuit is connected with the detection circuit and is configured to determine a duty ratio according to the input electric signal parameter and the output electric signal parameter and generate a corresponding driving signal according to the duty ratio; the input end of the driving circuit is connected with the control circuit, the output end of the driving circuit is connected with the switching circuit, and the driving circuit is configured to drive the switching circuit to be conducted for preset times according to the duty ratio according to the driving signal.

In the technical scheme, the driving control device comprises a control circuit and a driving circuit, wherein the control circuit determines the duty ratio of the switching circuit according to the load amount and generates a corresponding driving signal. The driving circuit drives the switching device in the switching circuit to work according to the driving signal, the duty ratio is increased when the load capacity is high, and the duty ratio is reduced when the load capacity is low, so that the reduction of the operation efficiency caused by the conduction loss of the switching device is avoided, and the operation efficiency of the driving control circuit is effectively improved.

A second aspect of the present invention provides a drive control method for controlling a drive control circuit provided in any one of the above-described aspects, the drive control circuit being configured to supply power to a load, the drive control method including: acquiring input electric signal parameters and output electric signal parameters of a driving control circuit; and adjusting the duty ratio of a switching circuit of the driving control circuit according to the input electric signal parameter and the output electric signal parameter.

In the technical scheme, the input electric signal parameter and the output electric signal parameter of the drive control circuit are obtained, the load condition of the drive control circuit can be accurately known according to the input electric signal parameter and the output electric signal parameter, and the duty ratio of the switch circuit is adjusted in real time according to the load condition, so that when the load is low, the reduction of the operation efficiency caused by the conduction loss of a switch device can be effectively avoided by a method for reducing the duty ratio of the switch circuit, and the operation efficiency of the drive control circuit is effectively improved.

In the above technical solution, the input electrical signal parameters include input current and input voltage, and the output electrical signal parameters include output current and output voltage; the method comprises the following steps of adjusting the duty ratio of a switching circuit of a driving control circuit according to input electric signal parameters and output electric signal parameters, and specifically comprises the following steps: determining a given current corresponding to the load according to the input current, the input voltage, the output current and the output voltage; a given duty cycle is determined from the given current and the duty cycle is adjusted to the given duty cycle.

In any of the above technical solutions, the switching circuit includes a first switching device, and the driving control method further includes: and controlling the first switching device to be conducted for a preset number of times according to the duty ratio in one period of the power supply signal.

In the technical scheme, for a boost PFC circuit comprising a switching circuit and a one-way conduction device, the switching device is controlled to be conducted according to a duty ratio in a positive half cycle and a negative half cycle of an alternating current power supply signal, the duty ratio is positively correlated with a load amount, the load amount is larger, the duty ratio is higher, the load amount is smaller, and the duty ratio is smaller.

In any of the above technical solutions, the switching circuit includes a second switching device, a third switching device, a fourth switching device, and a fifth switching device, and the driving control method further includes: in the first half period of the power supply signal, the fourth switching device is controlled to be turned off, and the fifth switching device is controlled to be turned on; acquiring a zero-crossing signal of the power supply signal in the last half period, and controlling the second switching device and the third switching device to be alternately conducted according to a duty ratio after acquiring the zero-crossing signal and delaying for a preset time length; in the lower half period of the power supply signal, controlling the fourth switching device to be switched on and controlling the fifth switching device to be switched off; and acquiring a zero-crossing signal of the power supply signal in the next half period, and after acquiring the zero-crossing signal and delaying the preset time length, controlling the second switching device and the third switching device to be alternately conducted according to the duty ratio.

In any of the above technical solutions, before the step of obtaining the input electrical signal parameter and the output electrical signal parameter of the driving control circuit, the driving control method further includes: acquiring bus voltage; outputting a pulse width modulation signal to the switching circuit based on the condition that the bus voltage is lower than a first preset voltage, and executing the step of acquiring an input electric signal parameter and an output electric signal parameter of the driving control circuit; stopping outputting the pulse width modulation signal to the switching circuit based on the condition that the bus voltage is higher than a second preset voltage so as to stop the switching circuit; the second preset voltage is higher than the first preset voltage.

According to the technical scheme, the bus voltage is sampled, and whether a pulse width modulation signal is output to the switch circuit or not is judged according to the bus voltage. Specifically, the first preset voltage is a lower limit of the bus voltage corresponding to the load, and the second preset voltage is an upper limit of the bus voltage corresponding to the load. If the bus voltage is higher than the second preset voltage, the PWM signal is stopped to be output at the moment, the switching circuit does not work, the voltage is reduced, on one hand, the voltage is prevented from being too high, and on the other hand, the loss caused by the switching circuit can be avoided. If the bus voltage is lower than the first preset voltage, a PMW signal is output to the switching circuit, the switching circuit starts to work, the voltage rises, and the load requirement can be met.

And when the PWM signal is output, the duty ratio corresponding to the switching circuit is further determined according to the load quantity.

A third aspect of the present invention provides a drive control apparatus for controlling a drive control circuit provided in any one of the above-described aspects, the drive control circuit being configured to supply power to a load, the drive control apparatus comprising: a memory configured to store a computer program; the processor is configured to run a computer program to implement the drive control method provided in any of the above technical solutions, and therefore, the drive control apparatus includes all the beneficial effects of the drive control apparatus provided in any of the above technical solutions, which are not described herein again.

A fourth aspect of the present invention provides an air conditioning apparatus including a compressor; and a drive control circuit provided in any of the above claims, the drive control circuit configured to supply power to the compressor; according to the driving control device provided in any of the above technical solutions, the driving control device is connected to the driving control circuit. Therefore, the air conditioner includes the drive control circuit provided in any one of the above technical solutions, and all the advantages of the drive control device provided in any one of the above technical solutions, which are not described herein again.

A fifth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the driving control method provided in any of the above technical solutions, and therefore, the computer-readable storage medium includes all the beneficial effects of the driving control method provided in any of the above technical solutions, which are not described herein again.

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 circuit diagram of a drive control circuit according to an embodiment of the invention;

FIG. 2 illustrates a topology of the drive control circuit when the inductive element discharges according to one embodiment of the present invention;

FIG. 3 illustrates a topology of a drive control circuit when a inductive element is charging according to one embodiment of the present invention;

FIG. 4 illustrates a topology of a drive control circuit when a capacitive element supplies power to a load according to one embodiment of the present invention;

fig. 5 shows a circuit diagram of a drive control circuit according to another embodiment of the present invention;

FIG. 6 is a waveform diagram illustrating operation of the boost PFC circuit during one cycle in accordance with one embodiment of the present invention;

FIG. 7 illustrates a waveform diagram of the operation of the boost PFC circuit in accordance with an embodiment of the present invention;

fig. 8 is a waveform diagram illustrating the operation of a totem-pole PFC circuit during one cycle in accordance with one embodiment of the present invention;

fig. 9 shows a waveform diagram illustrating the operation of a totem-pole PFC circuit in accordance with one embodiment of the present invention;

fig. 10 shows a flowchart of a drive control method according to an embodiment of the invention;

fig. 11 shows another flowchart of a drive control method according to an embodiment of the invention;

fig. 12 shows a flowchart of a drive control method according to another embodiment of the invention;

fig. 13 is a block diagram showing the structure of a drive control apparatus according to an embodiment of the present invention;

fig. 14 is a block diagram illustrating the construction of an air conditioner 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 and features of the embodiments of the present application 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 by the specific embodiments disclosed below.

The drive control circuit, the drive control method, the drive control apparatus, the air conditioner, and the computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 14.

The first embodiment is as follows:

as shown in fig. 1, in one embodiment of the present invention, there is provided a drive control circuit including: a power source; a power factor correction circuit connected to the power supply, the power factor correction circuit configured to receive a power supply signal of the power supply, the power factor correction circuit including a switching circuit, the power factor correction circuit configured to adjust a power factor of the drive control circuit and output the power supply signal to a load; the input detection unit is connected with the power supply and is configured to acquire an input electric signal parameter; the output detection unit is connected with the output end of the power factor correction circuit and is configured to acquire an output electric signal parameter; and the control device is connected with the detection circuit and the power factor correction circuit and is configured to adjust the duty ratio of the switching circuit according to the input electric signal parameter and the output electric signal parameter.

The drive control circuit further includes: the inductive element L is connected in series with the positive bus; and a first end of the capacitive element C is connected to the output end of the inductive element L, and a second end of the capacitive element C is connected to the negative bus.

The input electrical signal parameters comprise input current and input voltage, and the output electrical signal parameters comprise output current and output voltage; the control device is configured to: determining a given current corresponding to the load according to the input current, the input voltage, the output current and the output voltage; a given duty cycle is determined from the given current and the duty cycle is adjusted to the given duty cycle.

The switching circuit includes: a first switching device Q1, the first switching device Q1 is connected in parallel with the capacitive element C, a first end of the first switching device Q1 is connected between the output end of the inductive element L and the capacitive element C, a second end of the first switching device Q1 is connected to the negative bus, and a control end of the first switching device Q1 is connected to the control device; the power factor correction circuit further includes: the unidirectional conducting device D is connected in series with the positive bus, the input end of the unidirectional conducting device D is connected with the common end of the inductive element L and the first switching device Q1, and the output end of the unidirectional conducting device D is connected with the first end of the capacitive element C; or a switch tube (not shown in the figure), the switch tube is connected in series with the positive bus, the first end of the switch tube is connected with the common end of the inductive element and the first switch device, the second end of the switch tube is connected with the first end of the capacitive element, and the control end of the switch tube is connected with the control device.

The control device is further configured to: the first switching device Q1 is controlled to be turned on a preset number of times according to a duty ratio during one period of the power supply signal.

The drive control circuit further includes: and the rectifying circuit is connected to the bus circuit, the input end of the rectifying circuit is configured to receive a power supply signal, and the output end of the rectifying circuit is connected with the input end of the inductive element L.

The drive control device includes: the control circuit is connected with the detection circuit and is configured to determine a duty ratio according to the input electric signal parameter and the output electric signal parameter and generate a corresponding driving signal according to the duty ratio; the input end of the driving circuit is connected with the control circuit, the output end of the driving circuit is connected with the switching circuit, and the driving circuit is configured to drive the switching circuit to be conducted for preset times according to the duty ratio according to the driving signal.

In this embodiment, the driving control circuit is a power factor correction circuit, the power factor correction circuit is a boost pfc circuit, and the power factor correction circuit is provided with a switching circuit, and the switching circuit is controlled to perform switching to realize power factor correction.

For the boost PFC circuit, in the positive half cycle and the negative half cycle of an alternating current power supply signal, a switching device is controlled to be switched on according to a duty ratio, the duty ratio is positively correlated with a load amount, the larger the load amount is, the higher the duty ratio is, the smaller the load amount is, and the lower the duty ratio is.

The driving control circuit is also provided with an input detection unit and an output detection unit which are respectively used for detecting the input electric signal parameter and the output electric signal parameter, the load condition of the driving control circuit can be accurately known according to the input electric signal parameter and the output electric signal parameter, and the duty ratio of the switching circuit is adjusted in real time according to the load condition.

Specifically, the drive control circuit includes an inductive element L and a capacitive element C. When the PWM control signal of the pfc circuit is turned on, the driving control circuit includes two states, one is a discharge state of the inductive element L, as shown in fig. 2, in which the power source supplies power to the inductive element L, the capacitive element C, and the load. The other state is the inductive element L charged state, as shown in fig. 3, in which the power source charges the inductive element L and the capacitor supplies power to the load. In some cases, specifically when the PWM control signal is not turned on, a mode in which the capacitive element C discharges to the load, i.e., the load is supplied with power through the capacitive element C, is also included, as specifically shown in fig. 4. By switching the two states, the power factor of the drive control circuit can be effectively adjusted.

In operation, the input detection unit detects the current value and/or the voltage value of the power supply signal output by the power supply and accessed by the input end, and the output unit detects the current value and/or the voltage value of the power supply signal output to the load. When the input current value of the input side is smaller than the output current value of the output side, and/or the input voltage value of the input side is smaller than the output voltage value of the output side, the load is higher at the moment, and therefore the switching circuit is controlled to increase the duty ratio to meet the load requirement.

For the boost PFC circuit, the switching circuit comprises a unidirectional conducting device D, in particular a diode, connected in series to the positive bus, and a first switching device Q1, the first switching device Q1 being connected in parallel to the capacitive element C. As the load increases, the duty cycle of the first switching device Q1 correspondingly increases to increase the power supplied to the load. When the load is reduced, the duty ratio of the first switching device Q1 is correspondingly reduced, the conduction loss of the switching device is reduced, and the operation efficiency of the driving control circuit is improved.

In some embodiments, the boost PFC circuit includes a switching circuit and a switching tube, and for the case of using the switching tube, the state of the switching tube is controlled by the control device.

For the load requiring direct current, a rectification circuit is arranged to convert an alternating current power supply signal into a direct current power supply signal so as to meet the load requirement.

The input detection unit detects the current value and/or the voltage value of a power supply signal output by the power supply and connected to the input end, and the output unit detects the current value and/or the voltage value of the power supply signal output to the load. When the input current value of the input side is smaller than the output current value of the output side, and/or the input voltage value of the input side is smaller than the output voltage value of the output side, the load is higher at the moment, and therefore the switching circuit is controlled to increase the duty ratio to meet the load requirement.

The driving control device comprises a control circuit and a driving circuit, wherein the control circuit determines the duty ratio of the switching circuit according to the load and generates a corresponding driving signal. The driving circuit drives the switching device in the switching circuit to work according to the driving signal, the duty ratio is increased when the load capacity is high, and the duty ratio is reduced when the load capacity is low, so that the reduction of the operation efficiency caused by the conduction loss of the switching device is avoided, and the operation efficiency of the driving control circuit is effectively improved.

According to the embodiment of the invention, the load condition of the drive control circuit can be accurately known according to the input electric signal parameter and the output electric signal parameter, and the duty ratio of the switching circuit is adjusted in real time according to the load condition, so that when the load is low, the reduction of the operation efficiency caused by the conduction loss of a switching device can be effectively avoided by a method for reducing the duty ratio of the switching circuit, and the operation efficiency of the drive control circuit is further effectively improved.

Example two:

as shown in fig. 5, in one embodiment of the present invention, there is provided a drive control circuit including: a power source; a power factor correction circuit connected to the power supply, the power factor correction circuit configured to receive a power supply signal of the power supply, the power factor correction circuit including a switching circuit, the power factor correction circuit configured to adjust a power factor of the drive control circuit and output the power supply signal to a load; the input detection unit is connected with the power supply and is configured to acquire an input electric signal parameter; the output detection unit is connected with the output end of the power factor correction circuit and is configured to acquire an output electric signal parameter; and the control device is connected with the detection circuit and the power factor correction circuit and is configured to adjust the duty ratio of the switching circuit according to the input electric signal parameter and the output electric signal parameter.

The switching circuit includes: a second switching device Q2, a first terminal of the second switching device Q2 being connected to the output terminal of the inductive element L, a second terminal of the second switching device Q2 being connected to the first terminal of the capacitive element C, a control terminal of the second switching device Q2 being connected to the control means; a third switching device Q3, a first terminal of the third switching device Q3 being connected to the second terminal of the capacitive element, a second terminal of the third switching device Q3 being connected to the common terminal of the inductive element L and the second switching device Q2, a control terminal of the third switching device Q3 being connected to the control means; a fourth switching device Q4, a first terminal of the fourth switching device Q4 is connected to the negative terminal of the power supply, a second terminal of the fourth switching device Q4 is connected to the common terminal of the second switching device Q2 and the capacitive element C, and a control terminal of the fourth switching device Q4 is connected to the control device; a fifth switching device Q5, a first terminal of the fifth switching device Q5 being connected to the common terminal of the third switching device Q3 and the capacitive element C, a second terminal of the fifth switching device Q5 being connected to the first terminal of the fourth switching device Q4, and a control terminal of the fifth switching device Q5 being connected to the control means.

The control device is configured to: in the first half cycle of the power supply signal, the fourth switching device Q4 is controlled to be turned off, and the fifth switching device Q5 is controlled to be turned on; acquiring a zero-crossing signal of the power supply signal in the last half period, and after acquiring the zero-crossing signal and delaying a preset time length, controlling the second switching device Q2 and the third switching device Q3 to be alternately conducted according to a duty ratio; during the next half cycle of the supply signal, controlling the fourth switching device Q4 to be on and controlling the fifth switching device Q5 to be off; and acquiring a zero-crossing signal of the power supply signal in the next half period, and after acquiring the zero-crossing signal and delaying the preset time length, controlling the second switching device Q2 and the third switching device Q3 to be alternately conducted according to the duty ratio.

In this embodiment, the driving control circuit is a power factor correction circuit, the power factor correction circuit is a totem-pole PFC circuit, and the power factor correction circuit is provided with a switching circuit, and the switching circuit is controlled to perform switching to realize power factor correction.

For the totem pole PFC circuit, the fourth switching device Q4 is controlled to be turned off and the fifth switching device Q5 is controlled to be turned on in the positive half cycle of the switched-in alternating current signal. After the voltage crosses zero and is delayed for a preset time, the second switching device Q2 and the third switching device Q3 are alternately switched on for a preset number of times according to the duty ratio, the fifth switching device Q5 is controlled to be switched off and the fourth switching device Q4 is controlled to be switched on in the next half period of the alternating current signal, and after the voltage crosses zero and the preset time is prolonged, the second switching device Q2 and the third switching device Q3 are controlled to be alternately switched on for the preset number of times according to the duty ratio again.

The duty ratio is positively correlated with the load amount, the larger the load amount is, the more the duty ratio is, the smaller the load amount is, and the less the duty ratio is.

For a totem pole PFC circuit, the switching circuit includes a second switching device Q2, a third switching device Q3, a fourth switching device Q4, and a fifth switching device Q5. The power correction of the totem pole PFC circuit can be adjusted by adjusting the on and off of the second switching device Q2, the third switching device Q3, the fourth switching device Q4 and the fifth switching device Q5.

Example three:

as shown in fig. 1 to 8, in a complete embodiment of the present invention, a Burst control method applicable to a driving control circuit having a PFC circuit is proposed.

The PFC circuit has two conditions of PWM output connection and PWM output disconnection, and the connection of the PWM output is determined according to the bus voltage. Specifically, when the bus voltage is high, the PWM output is not turned on, and when the bus voltage is low, the PWM output is turned on.

When the PWM output is turned on, the driving control circuit has two operating modes, one is an inductor, capacitor and load power supply mode, i.e. an inductor discharge mode, and the topology of the driving control circuit is specifically shown in fig. 2.

The other mode is a mode in which the power supply charges the inductor and the capacitor supplies power to the load, and is also an inductor charging mode, and the topology of the driving control circuit is specifically shown in fig. 3.

When the PWM output is not on, only the capacitor supplies power to the load, i.e., the capacitor supplies power to the load mode, as shown in fig. 4.

When the PWM output is switched on, the switching of the two working modes is realized by the high-frequency work of the switching tube.

The Burst control method provided by the invention comprises the following steps: the switching of the working modes is realized by detecting the BUS voltage DC _ BUS, setting Vdc _ max (a second voltage threshold value) and Vdc _ min (a first voltage threshold value) to control whether PWM control is carried out or not and controlling the action state of a switching tube.

Vdc _ max is an upper limit of the DC _ BUS voltage, and depends on the smoothing electrolytic capacitor and the withstand voltage of the semiconductor element. Vdc _ min is the lower limit of the DC _ BUS voltage, which must be greater than the input AC voltage PEAK due to boost PFC action.

When the DC-BUS voltage is lower than or equal to Vdc _ min, PWM output is switched on, the switching tube starts to work in a multi-pulse mode, the DC-BUS voltage is increased, after the DC-BUS voltage exceeds Vdc _ max after working for a certain period, PWM stops outputting, the PFC works in a capacitor power supply mode, the DC-BUS voltage starts to drop, and the action is repeated when the voltage reaches a lower limit value, namely intermittent action.

For the boost PFC circuit shown in fig. 1, when the PWM output Is turned on, the operation waveform in one period Is shown in fig. 6, where Us Is the bus voltage, Is the bus current, and Q Is the control waveform of the first switching device Q1, and the overall operation waveform Is shown in fig. 7.

Specifically, the first switching device Q1 is controlled to be turned on n times at a duty ratio D in the positive half cycle and the negative half cycle of the alternating-current voltage, and the duty ratio D is not fixed every time, and the duty ratio D ranges from 0 to 1.

And determining the load capacity according to the input current and the load current, wherein when the input current is small and the load current is large, the value of the duty ratio D is larger, and when the input current is large and the load current is small, the load capacity is small, the value of the duty ratio D is smaller.

The load capacity can also be determined according to the input voltage and the load voltage, when the input voltage is low and the load demand voltage is high, the load capacity is high, the value of the duty ratio D is large, and when the input voltage is high and the load demand voltage is low, the load capacity is low, the value of the duty ratio D is small.

For the totem pole PFC circuit shown in fig. 5, when the PWM output Is on, the operation waveform in one period Is as shown in fig. 8, where Us Is the bus voltage and Is the bus current, and Q2 to Q5 correspond to the control waveforms of the second switching device Q2, the third switching device Q3, the fourth switching device Q4, and the fifth switching device Q5, respectively. The overall operating waveform is shown in fig. 9.

Specifically, in the positive half cycle of the alternating voltage, the Q5 is controlled to be switched on, and the Q4 is controlled to be switched off; after the voltage zero-crossing is delayed for a period of time, the Q2 and the Q3 are conducted n times with the space ratio D, the duty ratio D is not fixed every time, and the range of the duty ratio D is 0-1. When Q3 is on, the input current rises, and when Q2 is on, the input current falls.

In the negative half cycle of the alternating voltage, controlling the Q4 to be switched on and the Q5 to be switched off; after the voltage zero-crossing time delay is carried out for a period of time, the Q2 and the Q3 are alternately conducted n times, the input current is decreased when the Q2 is conducted, and the input current is increased when the Q3 is conducted.

The Burst mode operation in which the intermittent operation is performed within the upper limit-lower limit value range of the DC-BUS voltage is described further, in which a maximum DC-BUS voltage width (Vdc _ max-Vdc _ min) is obtained by controlling the Burst mode with a critical value as close as possible to the upper limit-lower limit value of the DC-BUS voltage, thereby maximizing the efficiency improvement result of the Burst mode.

In this way, an efficient PFC function can be achieved.

According to the embodiment of the invention, whether PWM is output or not can be realized according to the load by adopting a Burst control mode, instead of all periodic switching tubes being in a working state all the time, the duty ratio is small, the switching loss is reduced, and the PFC efficiency is improved.

Example four:

as shown in fig. 10, in an embodiment of the present invention, there is provided a drive control method for controlling a drive control circuit provided in any one of the above embodiments, the drive control circuit being configured to supply power to a load, the drive control method including:

step S1002, acquiring input electric signal parameters and output electric signal parameters of a drive control circuit;

and step S1004, adjusting the duty ratio of a switching circuit of the drive control circuit according to the input electric signal parameter and the output electric signal parameter.

The input electric signal parameters comprise input current and input voltage, and the output electric signal parameters comprise output current and output voltage; the method comprises the following steps of adjusting the duty ratio of a switching circuit of a driving control circuit according to input electric signal parameters and output electric signal parameters, and specifically comprises the following steps: determining that the input current is smaller than the output current and/or determining that the output voltage is smaller than the output voltage, and controlling the switching circuit to correspondingly increase the duty ratio; determining that the input current is greater than the output current and/or determining that the input voltage is greater than the output voltage, controlling the switching circuit to correspondingly decrease the duty cycle.

As shown in fig. 11, before the step of acquiring the input electrical signal parameter and the output electrical signal parameter of the drive control circuit, the drive control method further includes:

step S1102, acquiring bus voltage;

step S1104 of outputting a pulse width modulation signal to the switching circuit based on a condition that the bus voltage is lower than a first preset voltage;

in step S1104, after the pulse width modulation signal is output to the switching circuit, a step of acquiring an input electric signal parameter and an output electric signal parameter of the drive control circuit is performed.

In step S1106, based on the bus voltage being higher than the second preset voltage, the output of the pwm signal to the switching circuit is stopped to stop the switching circuit.

In step S1106, the second predetermined voltage is higher than the first predetermined voltage.

In the embodiment, the bus voltage is sampled, and whether the pulse width modulation signal is output to the switch circuit is judged according to the bus voltage. Specifically, the first preset voltage is a lower limit of the bus voltage corresponding to the load, and the second preset voltage is an upper limit of the bus voltage corresponding to the load. If the bus voltage is higher than the second preset voltage, the PWM signal is stopped to be output at the moment, the switching circuit does not work, the voltage is reduced, on one hand, the voltage is prevented from being too high, and on the other hand, the loss caused by the switching circuit can be avoided. If the bus voltage is lower than the first preset voltage, a PMW signal is output to the switching circuit, the switching circuit starts to work, the voltage rises, and the load requirement can be met.

Under the condition of outputting the PWM signal, the input electrical signal parameter and the output electrical signal parameter of the drive control circuit are obtained, the load condition of the drive control circuit can be accurately known according to the input electrical signal parameter and the output electrical signal parameter, and the duty ratio of the switching circuit is adjusted in real time according to the load condition, so that when the load is low, the reduction of the operation efficiency caused by the conduction loss of a switching device can be effectively avoided by the method for reducing the duty ratio of the switching circuit, and the operation efficiency of the drive control circuit is effectively improved.

The method comprises the steps of detecting a current value and/or a voltage value of a power supply signal output by a power supply and accessed by an input end, and detecting a current value and/or a voltage value of a power supply signal output to a load. When the input current value of the input side is smaller than the output current value of the output side, and/or the input voltage value of the input side is smaller than the output voltage value of the output side, the load is higher at the moment, and therefore the switching circuit is controlled to increase the duty ratio to meet the load requirement.

In one embodiment of the present invention, the switching circuit includes a first switching device, and the drive control method further includes: and controlling the first switching device to be conducted for a preset number of times according to the duty ratio in one period of the power supply signal.

In this embodiment, for a boost PFC circuit including a switching circuit and a unidirectional conducting device, in both a positive half cycle and a negative half cycle of an ac power supply signal, the switching device is controlled to conduct according to a duty ratio, the duty ratio is positively correlated with a load amount, the larger the load amount is, the more the duty ratio is, the smaller the load amount is, and the less the duty ratio is.

In one embodiment of the present invention, the switching circuit includes a second switching device, a third switching device, a fourth switching device, and a fifth switching device, and the drive control method further includes: in the first half period of the power supply signal, the fourth switching device is controlled to be turned off, and the fifth switching device is controlled to be turned on; acquiring a zero-crossing signal of the power supply signal in the last half period, and controlling the second switching device and the third switching device to be alternately conducted according to a duty ratio after acquiring the zero-crossing signal and delaying for a preset time length; in the lower half period of the power supply signal, controlling the fourth switching device to be switched on and controlling the fifth switching device to be switched off; and acquiring a zero-crossing signal of the power supply signal in the next half period, and after acquiring the zero-crossing signal and delaying the preset time length, controlling the second switching device and the third switching device to be alternately conducted according to the duty ratio.

In this embodiment, for the totem-pole PFC circuit, the fourth switching device is controlled to be turned off and the fifth switching device is controlled to be turned on during the positive half cycle of the switched-in alternating current signal. And after the voltage crosses the zero point and the preset time is delayed, the second switching device and the third switching device are alternately conducted for a preset number of times according to the duty ratio, the fifth switching device is controlled to be turned off and the fourth switching device is controlled to be conducted in the next half period of the alternating current signal, and after the voltage crosses the zero point and the preset time is prolonged, the second switching device and the third switching device are controlled to be alternately conducted for the preset number of times according to the duty ratio again.

Example five:

in an embodiment of the present invention, an intermittent PFC circuit control method is provided, and a complete flow of the control method is shown in fig. 12, specifically:

step S1202, judging whether the bus voltage is too high or too low; if the bus voltage is too high, the method enters S1204, and if the bus voltage is too low, the method enters S1206;

in step S1202, it is determined whether the bus voltage is too high or too low based on a preset threshold. Specifically, when the bus voltage is lower than a first voltage threshold (Vdc _ min), it is determined that the bus voltage is too low; when the bus voltage is higher than the second voltage threshold (Vdc _ max), it is determined that the bus voltage is excessively high.

Step S1204, the PWM output is closed;

in step S1204, the switch circuit is not controlled.

Step S1206, the PWM output is switched on;

in step S1206, the switching circuit is subjected to multi-pulse control.

Step S1208, determining the PFC circuit as the boost PFC circuit;

step S1210, determining a given current according to the input voltage/current and the load voltage/current, thereby obtaining a duty ratio;

step S1212, determining as a totem-pole PFC circuit;

in step S1214, a given current is determined according to the input voltage/current and the load voltage/current, so as to obtain the duty ratio.

Example six:

as shown in fig. 13, in an embodiment of the present invention, there is provided a drive control apparatus 1300 for controlling a drive control circuit provided in any one of the above-mentioned technical solutions, the drive control circuit being configured to supply power to a load, the drive control apparatus 1300 including: a memory 1302 configured to store a computer program; the processor 1304 is configured to run a computer program to implement the driving control method provided in any of the above-mentioned technical solutions, and therefore, the driving control apparatus includes all the beneficial effects of the driving control apparatus provided in any of the above-mentioned technical solutions, which is not described herein again.

Example seven:

as shown in fig. 14, in one embodiment of the present invention, there is provided an air conditioning apparatus 1400 including a compressor 1402; and a drive control circuit as provided in any of the embodiments above, the drive control circuit being configured to supply power to the compressor 1402; as in the drive control apparatus 1300 provided in any of the above embodiments, the drive control apparatus 1300 is connected to a drive control circuit. Therefore, the air conditioner includes the driving control circuit provided in any of the above embodiments, and all the advantages of the driving control device provided in any of the above embodiments are not described herein again.

Example eight:

in an embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the computer program is executed by a processor to implement the drive control method provided in any of the above embodiments, so that the computer-readable storage medium includes all the beneficial effects of the drive control method provided in any of the above embodiments, and the details are not repeated herein.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; 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 of the present invention, 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 present invention. In the present invention, 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

1. A drive control circuit, comprising:

a power source;

a power factor correction circuit connected to the power source, the power factor correction circuit configured to receive a power supply signal of the power source, the power factor correction circuit including a switching circuit, the power factor correction circuit configured to adjust a power factor of the drive control circuit and output the power supply signal to a load;

an input detection unit connected with the power supply, the input detection unit configured to acquire an input electrical signal parameter;

the output detection unit is connected with the output end of the power factor correction circuit and is configured to acquire an output electric signal parameter;

a control device connected to the detection circuit and the power factor correction circuit, the control device being configured to adjust a duty cycle corresponding to the switching circuit according to the input electrical signal parameter and the output electrical signal parameter.

2. The drive control circuit according to claim 1, further comprising:

an inductive element connected in series to the positive bus;

a capacitive element having a first end connected to a positive bus bar and a second end connected to a negative bus bar.

3. The drive control circuit of claim 2, wherein the input electrical signal parameters comprise an input current and an input voltage, and the output electrical signal parameters comprise an output current and an output voltage;

the control device is configured to:

determining a given current corresponding to the load according to the input current, the input voltage, the output current and the output voltage;

determining a given duty cycle from the given current and adjusting the duty cycle to the given duty cycle.

4. The drive control circuit according to claim 3, wherein the switching circuit comprises:

a first switch device, connected in parallel to the capacitive element, having a first end connected between the output end of the inductive element and the capacitive element, a second end connected to the negative bus, and a control end connected to the control device;

the power factor correction circuit further includes:

the unidirectional conducting device is connected in series with the positive bus, the input end of the unidirectional conducting device is connected with the common end of the inductive element and the first switch device, and the output end of the unidirectional conducting device is connected with the first end of the capacitive element; or

The switch tube is connected in series with the positive bus, the first end of the switch tube is connected with the common end of the inductive element and the first switch device, the second end of the switch tube is connected with the first end of the capacitive element, and the control end of the switch tube is connected with the control device.

5. The drive control circuit according to claim 4, wherein the control means is further configured to:

and controlling the first switching device to be conducted for preset times according to the duty ratio in one period of the power supply signal.

6. The drive control circuit according to claim 3, wherein the switching circuit comprises:

a second switching device, a first terminal of the second switching device is connected to the output terminal of the inductive element, a second terminal of the second switching device is connected to the first terminal of the capacitive element, and a control terminal of the second switching device is connected to the control device;

a third switching device, a first end of the third switching device is connected to the second end of the capacitive element part, a second end of the third switching device is connected to a common end of the inductive element and the second switching device, and a control end of the third switching device is connected with the control device;

a fourth switching device, a first terminal of the fourth switching device is connected to a negative power supply terminal, a second terminal of the fourth switching device is connected to a common terminal of the second switching device and the capacitive element, and a control terminal of the fourth switching device is connected to the control device;

a fifth switching device, a first terminal of the fifth switching device being connected to a common terminal of the third switching device and the capacitive element, a second terminal of the fifth switching device being connected to a first terminal of the fourth switching device, a control terminal of the fifth switching device being connected to the control means.

7. The drive control circuit according to claim 6, characterized in that the control means is configured to:

in the first half cycle of the power supply signal, controlling the fourth switching device to be turned off, and controlling the fifth switching device to be turned on;

acquiring a zero-crossing signal of the power supply signal in the upper half cycle, and after acquiring the zero-crossing signal and delaying for a preset time, controlling the second switching device and the third switching device to be alternately switched on for the preset times according to the duty ratio;

controlling the fourth switching device to be turned on and controlling the fifth switching device to be turned off in a next half period of the power supply signal;

and acquiring a zero-crossing signal of the power supply signal in the next half period, and controlling the second switching device and the third switching device to be alternately conducted for the preset times according to the duty ratio after acquiring the zero-crossing signal and delaying the preset time.

8. The drive control circuit according to claim 5, characterized by further comprising:

the rectifying circuit is connected to the bus circuit, the input end of the rectifying circuit is configured to receive the power supply signal, and the output end of the rectifying circuit is connected with the input end of the inductive element.

9. The drive control circuit according to any one of claims 1 to 8, wherein the drive control means includes:

a control circuit connected to the detection circuit, the control circuit configured to determine the duty cycle from the input electrical signal parameter and the output electrical signal parameter and to generate a corresponding drive signal from the duty cycle;

the input end of the driving circuit is connected with the control circuit, the output end of the driving circuit is connected with the switching circuit, and the driving circuit is configured to drive the switching circuit to be conducted for preset times according to the duty ratio according to the driving signal.

10. A drive control method for controlling a drive control circuit according to any one of claims 1 to 9, the drive control circuit being configured to supply power to a load, characterized by comprising:

acquiring input electric signal parameters and output electric signal parameters of the drive control circuit;

and adjusting the duty ratio corresponding to the switching circuit of the drive control circuit according to the input electric signal parameter and the output electric signal parameter.

11. The drive control method according to claim 10, wherein the input electrical signal parameters include an input current and an input voltage, and the output electrical signal parameters include an output current and an output voltage;

the step of adjusting the duty ratio of the switching circuit of the driving control circuit according to the input electrical signal parameter and the output electrical signal parameter specifically includes:

12. The drive control method according to claim 11, wherein the switching circuit includes a first switching device, the drive control method further comprising:

13. The drive control method according to claim 12, wherein the switching circuit includes a second switching device, a third switching device, a fourth switching device, and a fifth switching device, the drive control method further comprising:

14. A drive control device for controlling the drive control circuit according to any one of claims 1 to 9, characterized by comprising:

a memory configured to store a computer program;

a processor configured to run the computer program to implement the drive control method according to any one of claims 10 to 13.

15. An air conditioning apparatus, characterized by comprising:

a compressor; and

the drive control circuit according to any one of claims 1 to 9, configured to supply power to the compressor;

the drive control device of claim 14, connected to the drive control circuit.

16. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the drive control method according to any one of claims 10 to 14.