阅读说明：本技术 驱动控制电路板和空调器 (Drive control circuit board and air conditioner ) 是由 杨建宁 章文凯 于 2019-01-07 设计创作，主要内容包括：本发明提出了一种驱动控制电路板和一种空调器。其中,驱动控制电路板包括：驱动电路和功率电路,过流保护电路,其中,功率电路中设有功率开关,驱动电路的输出端能够输出驱动信号,驱动信号用于控制功率开关的导通状态,功率开关的导通状态被配置为用于校准母线信号；过流保护电路设有比较芯片,功率开关与比较芯片为共点接地,且接地点记作第一接地点,共点接地的连接方式用于滤除功率电路与比较芯片之间的共模干扰。通过将功率开关与比较芯片的接地点共地,使得在驱动电路和功率电路中形成的电压差与比较芯片的接地点相同,进而消除了驱动电路和功率电路中的寄生电感中生成的电压差的影响,提高了比较芯片的比较精度。(The invention provides a drive control circuit board and an air conditioner. Wherein, drive control circuit board includes: the power circuit is provided with a power switch, the output end of the driving circuit can output a driving signal, the driving signal is used for controlling the conducting state of the power switch, and the conducting state of the power switch is configured to be used for calibrating a bus signal; the overcurrent protection circuit is provided with a comparison chip, the power switch and the comparison chip are in common-point grounding, the grounding point is recorded as a first grounding point, and the common-point grounding connection mode is used for filtering common-mode interference between the power circuit and the comparison chip. The power switch and the grounding point of the comparison chip are grounded, so that the voltage difference formed in the driving circuit and the power circuit is the same as the grounding point of the comparison chip, the influence of the voltage difference generated in parasitic inductors in the driving circuit and the power circuit is eliminated, and the comparison accuracy of the comparison chip is improved.)

1. A drive control circuit board, comprising:

a power factor correction circuit having at least three power factor correction legs electrically interconnected, any given said power factor correction leg comprising:

the device comprises a driving circuit and a power circuit, wherein a power switch is arranged in the power circuit, the output end of the driving circuit can output a driving signal, the driving signal is used for controlling the conducting state of the power switch, and the conducting state of the power switch is configured to be used for calibrating a bus signal;

the overcurrent protection circuit is provided with a comparison chip, the power switch and the comparison chip are in common-point grounding, the grounding point is recorded as a first grounding point, and the common-point grounding connection mode is used for filtering common-mode interference between the power circuit and the comparison chip.

2. The drive control circuit board according to claim 1, wherein the power circuit comprises:

the sampling end of the first resistive element is connected to the first end of the power switch, the grounding end of the first resistive element is connected to the first grounding point, and the sampling end of the first resistive element is used for outputting a sampling current signal of the power circuit load.

3. The drive control circuit board according to claim 2,

and the power supply end of the comparison chip is connected to a first direct current source, and an alternating current filter element is connected in series between the first direct current source and the first grounding point.

4. The drive control circuit board of claim 3, wherein the power circuit further comprises:

and a first end of the second resistive element is connected to the first grounding point, a second end of the second resistive element is connected with the first input end of the comparison chip, and the second end of the second resistive element is used for inputting a reference signal to the comparison chip.

5. The drive control circuit board of claim 3, wherein the over-current protection circuit further comprises:

and the first end of the third resistive element is connected with the sampling end of the first resistive element, the second end of the third resistive element is connected with the second input end of the comparison chip, and the second end of the third resistive element is used for inputting a sampling signal to the comparison chip.

6. The drive control circuit board of claim 4, wherein the over-current protection circuit further comprises:

and the fourth resistive element is connected in series between the first direct current source and the second end of the second resistive element, and a reference signal formed by voltage division of the fourth resistive element and the second resistive element is a reference voltage signal.

7. The drive control circuit board of claim 5, wherein the over-current protection circuit further comprises:

and the third resistive element and the fifth resistive element are used for dividing the sampling current signal into sampling voltage signals.

8. The drive control circuit board according to claim 4, characterized by further comprising:

and the sixth resistive element is connected in series with the second ends of the first direct current source and the second resistive element and is used for limiting the current of the reference signal input to the comparison chip.

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

and the seventh resistive element is connected in series with the first direct current source and the second end of the third resistive element and is used for limiting the current of the sampling signal input to the comparison chip.

10. The drive control circuit board according to any one of claims 2 to 9,

the output end of the comparison chip is connected to the input end of the driving loop, the comparison chip is used for obtaining a load signal of the power circuit, detecting whether the power circuit is in an overcurrent state or not according to the load signal, controlling the power switch to be switched off when the load signal of the power circuit is detected to be the overcurrent signal, and controlling the power switch to be switched on when the load signal of the power circuit is detected to be a non-overcurrent signal.

11. An air conditioner, comprising:

a motor;

the drive control circuit board according to any one of claims 1 to 10, wherein a signal input end of the motor is connected to the drive control circuit board, and a bus signal output by the drive control circuit board is used for driving the motor to operate.

Technical Field

The invention relates to the technical field of circuits, in particular to a drive control circuit board and an air conditioner.

Background

Generally, a power factor correction circuit is used to adjust a bus signal, so that the adjusted power is fully utilized, and the loss of exchange power due to a phase difference between current and voltage is reduced.

In the process of adjusting the bus signal by using the power factor correction circuit, in order to avoid the damage of components of the power factor correction circuit caused by overcurrent of the power factor correction circuit, an overcurrent detection circuit is usually arranged on the power factor correction circuit, so that the safe operation of the power factor correction circuit is ensured.

However, due to the parasitic inductance of the factor correction circuit, in the operation process of the power factor correction circuit, under the action of a large current, a voltage is induced on the parasitic inductance by the on and off of any switching element, and the generated induced voltage is directly released through the ground wire, so that a large voltage difference occurs on the ground wire, and due to the existence of a voltage difference value, the work of a comparator in the overcurrent detection circuit can be interfered, and the accuracy and reliability of the overcurrent detection circuit are further reduced.

Therefore, a new driving control circuit board is needed to solve the above problems.

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 is to provide a driving control circuit board.

A second aspect of the present invention is to provide an air conditioner.

In view of this, according to a first aspect of the present invention, there is provided a drive control circuit board including: the power factor correction circuit comprises at least three power factor correction branches which are electrically connected with each other, and any appointed power factor correction branch comprises: the power circuit is provided with a power switch, the output end of the driving circuit can output a driving signal, the driving signal is used for controlling the conducting state of the power switch, and the conducting state of the power switch is configured to be used for calibrating a bus signal; the overcurrent protection circuit is provided with a comparison chip, the power switch and the comparison chip are in common-point grounding, the grounding point is recorded as a first grounding point, and the common-point grounding connection mode is used for filtering common-mode interference between the power circuit and the comparison chip.

The driving control circuit board provided by the invention is provided with three power factor correction circuits, wherein the three power factor correction circuits are mutually and electrically connected to form three paths of staggered parallel power factor correction circuits, the three paths of staggered parallel power factor correction circuits have the same input source, the switching frequencies of power switches in the power circuits are the same, and the carrier phase shift of each path is 120 degrees, so that the input and output current ripple can be reduced through the formed three paths of staggered parallel power factor correction circuits. Any one of the three interleaved parallel power factor correction circuits comprises a drive circuit, a power circuit and an overcurrent protection circuit, and specifically, the drive circuit outputs a drive signal to control the conduction state of a power switch in the power circuit so as to calibrate a bus signal; the overcurrent protection circuit is provided with the comparison chip, and the voltage difference formed in the driving circuit and the power circuit is the same as the grounding point of the comparison chip by grounding the grounding points of the power switch and the comparison chip, so that the influence of the voltage difference generated in parasitic inductances in the driving circuit and the power circuit is eliminated, and the comparison precision of the comparison chip is improved. Meanwhile, the influence of voltage difference generated between different branches in the three-way interleaved parallel power factor correction circuit can be eliminated.

The drive control circuit board according to the present invention may further have the following technical features:

in the above technical solution, further, the power circuit includes: the sampling end of the first resistive element is connected to the first end of the power switch, the grounding end of the first resistive element is connected to the first grounding point, and the sampling end of the first resistive element is used for outputting a sampling current signal of the power circuit load.

In the technical scheme, a first resistive element is arranged in the power circuit, the power switch is connected with a first grounding point by the first resistive element, and the current flowing through the power switch is determined by detecting the voltage difference value at two ends of the first resistive element, so that whether the power circuit is over-current or not is determined according to the determined rated current, and then the over-current protection of the power circuit is realized.

In the above technical solution, further, a power supply end of the comparison chip is connected to a first dc source, and an ac filter element is connected in series between the first dc source and a first ground point.

In the technical scheme, the power supply end of the comparison chip is connected to the first direct current source to provide working voltage for the comparison chip, and meanwhile, the alternating current filter element is arranged between the first direct current source and the first grounding point, so that the influence of voltage difference generated in parasitic inductance in a driving circuit and a power circuit is eliminated by utilizing the alternating current filter element, and the comparison precision of the comparison chip is improved.

In the above technical solution, further, the power circuit further includes: and a first end of the second resistive element is connected to the first grounding point, a second end of the second resistive element is connected with the first input end of the comparison chip, and the second end of the second resistive element is used for inputting a reference signal to the comparison chip.

In the technical scheme, the second resistive element is arranged, the first grounding point is connected with the comparison chip by the second resistive element, and an input reference signal is provided for the comparison chip, so that whether the power switch is over-current or not is judged according to the input reference signal of the comparison chip.

In the above technical solution, further, the overcurrent protection circuit further includes: and a first end of the third resistive element is connected with the sampling end of the first resistive element, a second end of the third resistive element is connected with a second input end of the comparison chip, and a second end of the third resistive element is used for inputting a sampling signal to the comparison chip.

In the technical scheme, the third resistive element is arranged, the sampling end of the first resistive element is connected with the second input end of the comparison chip by the third resistive element, and then a sampling signal is input into the comparison chip, so that the comparison chip can compare the sampling signal with a reference signal, and further judge whether the power switch is over-current.

In the above technical solution, further, the overcurrent protection circuit further includes: and the fourth resistive element is connected in series between the first direct current source and the second end of the second resistive element, and a reference signal formed by voltage division of the fourth resistive element and the second resistive element is a reference voltage signal.

In the technical scheme, a reference signal formed by voltage division of the fourth resistive element and the second resistive element is set as a reference voltage signal, so that current flowing through the second resistive element is limited, damage caused by overlarge current is avoided, and meanwhile, the signal of the second resistive element is clamped to be at a high level by utilizing the connection relation of the first direct current source, so that a clear reference signal is obtained, and fluctuation of the reference voltage signal is avoided.

In the above technical solution, further, the overcurrent protection circuit further includes: and the third resistive element and the fifth resistive element are used for dividing the sampling current signal into a sampling voltage signal.

In the technical scheme, a fifth resistive element and a third resistive element are arranged to divide a sampling current signal into a sampling voltage signal, so that the sampling voltage signal and a reference voltage signal can be compared according to the obtained sampling voltage signal.

In the above technical solution, further, the method further includes: and the sixth resistive element is connected in series with the second ends of the first direct current source and the second resistive element and is used for limiting the current of the reference signal input to the comparison chip.

In the technical scheme, in order to avoid the second resistive element from being damaged due to overcurrent, the sixth resistive element connected with the second resistive element in series is arranged, and the sixth resistive element is used for limiting the reference signal input into the comparison chip, so that the damage of the comparison chip is avoided, and the reliability of the circuit is improved.

In the above technical solution, further, the method further includes: and the seventh resistive element is connected in series with the first direct current source and the second end of the third resistive element and is used for limiting the current of the sampling signal input to the comparison chip.

In the technical scheme, in order to avoid the third resistive element from being damaged due to overcurrent, the seventh resistive element is arranged in series with the third resistive element, and the seventh resistive element is used for limiting the sampling signal input into the comparison chip, so that the damage of the comparison chip is avoided, and the reliability of the circuit is improved.

In the above technical solution, further, an output end of the comparison chip is connected to an input end of the driving circuit, and the comparison chip is configured to obtain a load signal of the power circuit, detect whether the power circuit is overcurrent according to the load signal, control the power switch to be turned off when detecting that the load signal of the power circuit is the overcurrent signal, and control the power switch to be turned on when detecting that the load signal of the power circuit is the non-overcurrent signal.

In the technical scheme, the comparison chip judges whether the power circuit is over-current according to the detected load signal, and controls the power switch to be cut off when the judgment result is yes, so that the protection of the power circuit is realized, and the operation safety of the drive control circuit board is improved. And when the judgment result is negative, controlling the power switch to be conducted so as to ensure the stable operation of the circuit.

According to a second aspect of the present invention, there is provided an air conditioner comprising: the signal input end of the motor is connected to the drive control circuit board, and a bus signal output by the drive control circuit board is used for driving the motor to run.

The air conditioner provided by the invention comprises the motor and the drive control circuit board in any technical scheme of the first aspect of the invention, so that the air conditioner has all the beneficial effects of the drive control circuit board in any technical scheme, and the description is omitted.

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 diagram of a drive control circuit board according to an embodiment of the present invention.

Fig. 2 shows a schematic diagram of a general drive control circuit board;

fig. 3 shows a schematic diagram of a general drive control circuit board;

FIG. 4 shows a schematic diagram of a drive control circuit board according to one embodiment of the invention;

FIG. 5 shows a schematic diagram of a drive control circuit board according to one embodiment of the invention;

fig. 6 shows a schematic diagram of a drive control circuit board according to an embodiment of the present invention.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in 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 to the specific embodiments disclosed below.

An embodiment of the first aspect of the present invention provides a driving control circuit board, as shown in fig. 1 to 6, where fig. 1 shows that three power factor correction branches of the present invention form a three-way interleaved parallel power factor correction circuit. As shown in fig. 2 and 3, the grounding point of the 4-pin in the comparison chip and the first resistive element R28 is not the same grounding point PENG. As shown in fig. 4, the drive control circuit board includes: a power factor correction circuit, wherein the power factor correction circuit has at least three power factor correction branches electrically connected to each other, as shown in fig. 5 and 6, and any given power factor correction branch includes: a driving circuit and a power circuit, wherein the overcurrent protection circuit is specifically provided with a power switch Q6 as shown in FIG. 6, an output end of a driving circuit IC11 can output a driving signal, the driving signal is used for controlling the conducting state of a power switch Q6, and the conducting state of a power switch Q6 is configured to be used for calibrating a bus signal; the overcurrent protection circuit is provided with a comparison chip IC600, the power switch Q6 and the comparison chip IC600 are grounded in a common point mode, the ground point is recorded as a first ground point PGND1, and the common point grounding connection mode is used for filtering common mode interference between the power circuit and the comparison chip.

The driving control circuit board provided by the invention is provided with three power factor correction circuits, wherein the three power factor correction circuits are mutually and electrically connected to form three paths of staggered parallel power factor correction circuits, the three paths of staggered parallel power factor correction circuits have the same input source, the switching frequencies of power switches Q6 in the power circuits are the same, and the carrier phase shift of each path is 120 degrees, so that the input and output current ripple can be reduced through the formed three paths of staggered parallel power factor correction circuits. Any one of the three interleaved parallel power factor correction circuits comprises a driving circuit, a power circuit and an overcurrent protection circuit, specifically, the driving circuit outputs a driving signal to control the conduction state of a power switch Q6 in the power circuit so as to calibrate a bus signal; the overcurrent protection circuit is provided with a comparison chip IC600, and the power switch Q6 is grounded with the grounding point of the comparison chip IC600, so that the voltage difference formed in the driving circuit and the power circuit is the same as the grounding point of the comparison chip IC600, such as PGND1, PGND2 and PGND3, thereby eliminating the influence of the voltage difference generated in the parasitic inductance in the driving circuit and the power circuit and improving the comparison accuracy of the comparison chip IC 600. Meanwhile, the influence of voltage difference generated between different branches in the three-way interleaved parallel power factor correction circuit can be eliminated.

In one embodiment of the invention, a power circuit includes: the sampling end of the first resistive element R28 and the sampling end of the first resistive element R28 are connected to the first end of the power switch Q6, the ground end of the first resistive element R28 is connected to the first ground point, and the sampling end of the first resistive element R28 is used for outputting a sampling current signal of the power circuit load.

In this embodiment, the first resistive element R28 is provided in the power circuit, the power switch Q6 is connected to the first ground point by the first resistive element R28, and the current flowing through the power switch Q6 is determined by detecting the voltage difference across the first resistive element R28, so as to determine whether the power circuit is overcurrent according to the determined rated current, thereby realizing overcurrent protection of the power circuit.

In an embodiment of the present invention, the power supply terminal of the comparison chip IC600 is connected to a first dc source, and an ac filter element C603 is connected in series between the first dc source and a first ground point.

In this embodiment, the power supply terminal of the comparison chip IC600 is connected to the first dc source to provide the working voltage for the comparison chip IC600, and meanwhile, the ac filter element is disposed between the first dc source and the first ground point, so that the ac filter element is utilized to eliminate the influence of the voltage difference generated in the parasitic inductance in the driving circuit and the power circuit, thereby improving the comparison accuracy of the comparison chip IC 600.

In one embodiment of the invention, the power circuit further comprises: a first end of the second resistive element R6081 is connected to the first ground point, a second end of the second resistive element R6081 is connected to the first input end of the comparison chip IC600, and a second end of the second resistive element R6081 is used for inputting a reference signal to the comparison chip IC 600.

In this embodiment, by providing the second resistive element R6081, the first ground is connected to the comparison chip IC600 by the second resistive element R6081, and the comparison chip IC600 is supplied with the input reference signal so that the power switch Q6 is overcurrent or not according to the input reference signal of the comparison chip IC 600.

In one embodiment of the present invention, the overcurrent protection circuit further includes: and a first end of the third resistive element R609 is connected to a sampling end of the first resistive element R28, a second end of the third resistive element R609 is connected to a second input end of the comparison chip IC600, and a second end of the third resistive element R609 is used for inputting a sampling signal to the comparison chip IC 600.

In this embodiment, by providing the third resistive element R609, the third resistive element R609 is used to connect the sampling end of the first resistive element R28 with the second input end of the comparison chip IC600, so as to input a sampling signal to the comparison chip IC600, so that the comparison chip IC600 compares the sampling signal with a reference signal, and further determines whether the power switch Q6 is overcurrent.

In one embodiment of the present invention, the overcurrent protection circuit further includes: the fourth resistive element R606 is connected in series between the first direct current source and the second end of the second resistive element R6081, and a reference signal formed by voltage division of the fourth resistive element R606 and the second resistive element R6081 is a reference voltage signal.

In this embodiment, a reference signal formed by dividing the voltage of the fourth resistive element R606 and the second resistive element R6081 is set as a reference voltage signal, and then the current flowing through the second resistive element R6081 is limited, so that damage caused by an excessive current is avoided, and meanwhile, the signal of the second resistive element R6081 is clamped at a high level by using the connection relationship of the first direct current source, so as to obtain an explicit reference signal, and avoid fluctuation of the reference voltage signal.

In one embodiment of the present invention, the overcurrent protection circuit further includes: and the fifth resistive element R607 is connected in series between the first direct current source and the second end of the third resistive element R609, and the third resistive element R609 and the fifth resistive element R607 are used for dividing the sampling current signal into a sampling voltage signal.

In this embodiment, the sampling current signal is divided and converted into the sampling voltage signal by providing the fifth resistive element R607 and the third resistive element R609, so that the sampling voltage signal is compared with the reference voltage signal according to the obtained sampling voltage signal.

In one embodiment of the present invention, the method further comprises: the sixth resistive element R605 is connected in series to the second ends of the first dc source and the second resistive element R6081, and is configured to limit the current of the reference signal input to the comparison chip IC 600.

In this embodiment, in order to avoid the second resistive element R6081 from being damaged due to overcurrent, the sixth resistive element R605 connected in series with the second resistive element R6081 is provided, and the sixth resistive element R605 is used to limit the reference signal input to the comparison chip IC600, so that the comparison chip IC600 is prevented from being damaged, and the reliability of the circuit is improved.

In one embodiment of the present invention, the method further comprises: and a seventh resistive element (a sixth resistive element R605) connected in series to the first dc source and the second end of the third resistive element R609, for limiting a current of the sampling signal input to the comparison chip IC 600.

In the technical scheme, in order to avoid the third resistive element R609 from being damaged due to overcurrent, a seventh resistive element connected in series with the third resistive element R609 is arranged, and the seventh resistive element (a sixth resistive element R605) is used for limiting the sampling signal input into the comparison chip IC600, so that the comparison chip IC600 is prevented from being damaged, and the reliability of the circuit is improved.

In an embodiment of the present invention, the output terminal of the comparison chip IC600 is connected to the input terminal of the driving circuit, and the comparison chip IC600 is configured to obtain a load signal of the power circuit, detect whether the power circuit is over-current according to the load signal, control the power switch Q6 to be turned off when detecting that the load signal of the power circuit is an over-current signal, and control the power switch Q6 to be turned on when detecting that the load signal of the power circuit is a non-over-current signal.

In this embodiment, the comparison chip IC600 determines whether the power circuit is overcurrent according to the detected load signal, and when the determination result is yes, controls the power switch Q6 to be turned off, thereby implementing protection of the power circuit and improving the operation safety of the driving control circuit board. And when the judgment result is negative, the power switch Q6 is controlled to be conducted so as to ensure the stable operation of the circuit.

In one embodiment of the present invention, further comprising: a first capacitive element C602 for filtering out sampling fluctuations; the eighth resistive element R38, the ninth resistive element R14, and the ninth resistive element R6, which are connected in series in this order, connect the first dc source to a first ground point.

In an embodiment of the second aspect of the present invention, there is provided an air conditioner including: the signal input end of the motor is connected to the drive control circuit board, and a bus signal output by the drive control circuit board is used for driving the motor to run.

The air conditioner provided by the invention comprises the motor and the drive control circuit board in any technical scheme of the first aspect of the invention, so that the air conditioner has all the beneficial effects of the drive control circuit board in any technical scheme, and the description is omitted.

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 is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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.