CN111835214A - Method for transmitting and receiving command between master controller and slave controller of power converter - Google Patents

Abstract

The invention discloses a method for transmitting and receiving commands between a master controller and a slave controller of a power converter. The command receiving and sending method comprises the steps of starting the master controller and the slave controller; one of the master controller and the slave controller detects a node voltage on a pin of the controller; when the node voltage is smaller than a preset voltage, the controller transmits a first instruction in a plurality of first instructions to the other controller of the master controller and the slave controller through the pin, wherein the preset voltage is related to the over-temperature protection of the power converter; and after the controller receives the first return signal transmitted by the other controller, the controller detects the node voltage again. Therefore, compared with the prior art, the method for receiving and sending the instructions has the advantages of simple operation, covering a plurality of instructions, and no additional pin is needed for the master controller and the slave controller to execute the method.

Description

Method for transmitting and receiving command between master controller and slave controller of power converter

Technical Field

The present invention relates to a method for transmitting and receiving commands for a power converter, and more particularly, to a method for transmitting and receiving commands between a master controller and a slave controller of a power converter.

Background

In the prior art, because the design trend of the power converter applied to the television gradually adopts the design of flyback standby (flyback standby), the power converter only consists of a Pulse Width Modulation (PWM) stage circuit and a Power Factor Correction (PFC) stage circuit. Therefore, the power converter needs to be controlled by a master controller (master controller) and a slave controller (slave controller), wherein the master controller controls the pwm stage circuit and the slave controller controls the power factor corrector stage circuit, and the master controller and the slave controller are separated from each other.

Because the master controller and the slave controller are separated from each other, a well-functioning command transceiving method is required between the master controller and the slave controller so that the pwm stage circuit and the pfc stage circuit cooperate well. However, the prior art only provides a command transceiving method with limited functions, so how to provide a command transceiving method with simple operation and covering multiple commands becomes an important issue in the design trend of the power converter.

Disclosure of Invention

An embodiment of the invention discloses a method for transmitting and receiving commands between a master controller (master controller) and a slave controller (slave controller) of a power converter. The command receiving and sending method comprises the steps of starting the master controller and the slave controller; one of the master controller and the slave controller detects a node voltage on a pin of the controller; when the node voltage is less than a predetermined voltage, the controller transmits a first command of a plurality of first commands to the other controller of the master controller and the slave controller through the pin, wherein the predetermined voltage is related to Over Temperature Protection (OTP) of the power converter; and after the controller receives the first return signal transmitted by the other controller, the controller detects the node voltage again.

The invention further discloses a command transceiving method between the master controller and the slave controller of the power converter. The command receiving and sending method comprises the steps of starting the master controller and the slave controller; one of the master controller and the slave controller detects a node voltage on a pin of the controller; when the node voltage is smaller than a preset voltage, the controller transmits a first instruction in a plurality of first instructions to the other controller in the master controller and the slave controller through the pin, wherein each first instruction in the plurality of first instructions corresponds to a preset voltage range; and after the controller receives the first return signal transmitted by the other controller, the controller detects the node voltage again.

The invention discloses a method for receiving and transmitting instructions. The command receiving and sending method is that each command in a plurality of commands transmitted between a master controller and a slave controller corresponds to a preset voltage range, and a pin used by the master controller for transmitting the commands corresponds to at least one preset function (such as over-temperature protection). Therefore, compared with the prior art, the method for receiving and sending the instructions disclosed by the invention has the advantages that the operation is simple, a plurality of instructions are covered, and the main controller and the slave controller do not need additional pins to execute the method.

Drawings

Fig. 1 is a schematic diagram of a master controller and a slave controller for a power converter according to a first embodiment of the present invention.

Fig. 2 is a flowchart of a method for transmitting and receiving commands between a master controller and a slave controller of a power converter according to a second embodiment of the present invention.

Fig. 3 is a diagram illustrating a timing of a method of transmitting and receiving an instruction between a master controller and a slave controller.

Fig. 4 is a schematic diagram illustrating the above-mentioned command transceiving method applied to power converter start-up.

Fig. 5 is a schematic diagram illustrating the command transmitting/receiving method applied to high/low alternating current (AC high/low line).

Fig. 6 is a schematic diagram illustrating the power converter shutdown applied by the command transceiving method.

Wherein the reference numerals are as follows:

100 power converter

102 pulse width modulation stage circuit

104 power factor correcting stage circuit

106 thermistor

202 main controller

204 slave controller

2022. 2042, CTRLA, CTRLB, HV pins

2024. 2042 control interface

ACBI alternating voltage overvoltage command

ACBO alternating voltage under-voltage instruction

ACHL high AC voltage command

ACLL Low AC Voltage command

GND ground terminal

OTPS over-temperature protection signal

PFCBMI enter burst mode instruction

PFCBMO leave burst mode instruction

RACBI, RACHL, RACLL, RACBO return signals

Time T1-T7

TD1, TD2, TD3 delay time

VCT, VCT1, VCT2, VCT3 correspond to voltages

VAC alternating voltage

VDC direct voltage

VNO node voltage

VP predetermined voltage

VOTP over-temperature protection reference voltage

VACBNI overvoltage

VACBNO undervoltage

VACHL high AC voltage reference voltage

VACLL low AC voltage reference voltage

300 step 318

Detailed Description

Referring to fig. 1, fig. 1 is a schematic diagram of a master controller (master controller)202 and a slave controller (slave controller)204 for a power converter 100 according to a first embodiment of the present invention. As shown in fig. 1, the power converter 100 includes a Pulse Width Modulation (PWM) stage 102 and a Power Factor Correction (PFC) stage 104, wherein the PWM stage 102 may be a flyback (flyback) circuit or an lc-capacitor (LLC) circuit, the PWM stage 102 is used for converting an ac voltage VAC into a dc voltage VDC, and the PFC stage 104 is used for improving the conversion efficiency of the power converter 100. In addition, the pwm stage 102 and the pfc stage 104 are well known in the art and therefore will not be further described herein. In addition, as shown in FIG. 1, the master controller 202 is used to control the operation of the PWM stage 102, the slave controller 204 is used to control the operation of the PFC stage 104, and the master controller 202 and the slave controller 204 communicate with each other via the pins CTRLA and CTRLB, respectively. In addition, in order to simplify FIG. 1, pin CTRLA of the master controller 202, pin 2022 for ground GND, and a pin other than pin HV are omitted from FIG. 1, and pin CTRLB of the slave controller 204 and a pin other than pin 2042 for ground GND are also omitted from FIG. 1.

Referring to fig. 2, fig. 2 is a flowchart illustrating a method for transmitting and receiving commands between a master controller and a slave controller of a power converter according to a second embodiment of the present invention. The method for transmitting and receiving commands in fig. 2 is described by using the power converter 100, the master controller 202 and the slave controller 204 in fig. 1, and the detailed steps are as follows:

step 300: starting;

step 302: starting the master controller 202 and the slave controller 204;

step 304: a controller of the master controller 202 and the slave controller 204 detects a node voltage VNO on a pin of the controller;

step 306: whether the node voltage VNO is less than a predetermined voltage VP; if so, go to step 308; if not, go to step 316;

step 308: whether the controller is to transmit a first command of the plurality of first commands to another controller of the master controller 202 and the slave controller 204 through the pins; if so, go to step 310; if not, jumping to step 304;

step 310: the controller enters a transmitter state;

step 312: the controller transmits the first instruction to the other controller through the pin; step 314: whether the controller receives a first backhaul signal transmitted by the other controller; if yes, go to step 304; if not, go to step 312;

step 316: the controller enters a receiver state (receiver state);

step 318: the controller receives a second instruction of the second instructions transmitted by the other controller, and the controller executes the second instruction and transmits a second return signal to the other controller through the pin, and the process goes to step 304.

First, taking the controller as the master controller 202 and the other controller as the slave controller 204 as an example, the following is detailed:

in step 302, after an ac power source (not shown in fig. 1) starts to provide the ac voltage VAC, the main controller 202 may start first when the ac voltage VAC is greater than an overvoltage voltage VACBNI. As shown in FIG. 1, the node voltage VNO is less than the predetermined voltage VP (e.g., 1.5V) because VNO is determined by the predetermined voltage VP and a thermistor 106 (having a negative temperature coefficient). In step 304, the main controller 202 first detects the node voltage VNO on the pin CTRLA and determines whether to perform an Over Temperature Protection (OTP) on the power converter 100, wherein the predetermined voltage VP is related to the node voltage VNO and the predetermined voltage VP because the node voltage VNO is related to the over temperature protection. Therefore, when the node voltage VNO is less than an over-temperature protection reference voltage VOTP (where the over-temperature protection reference voltage VOTP is less than the predetermined voltage VP, for example, the over-temperature protection reference voltage VOTP is 0.9V), the main controller 202 generates an over-temperature protection signal OTPS to the control interface 2024 in the main controller 202. At this time, the control interface 2024 transmits the over-temperature protection signal OTPS to an over-temperature protection circuit corresponding to the over-temperature protection signal OTPS in the main controller 202, and the over-temperature protection circuit performs the over-temperature protection on the power converter 100 accordingly. In addition, when the node voltage VNO is between the predetermined voltage VP and the over-temperature protection reference voltage VOTP, the main controller 202 does not generate the over-temperature protection signal OTPS to the control interface 2024 in the main controller 202. In addition, since the over-temperature protection circuit is not a technical feature of the present invention, it is not described herein again. In step 306, after the master controller 202 does not perform the over-temperature protection on the power converter 100, the master controller 202 detects whether the node voltage VNO is also less than the predetermined voltage VP, wherein the node voltage VNO is less than the predetermined voltage VP when no command is transmitted between the master controller 202 and the slave controller 204. In step 308, when the node voltage VNO is less than the predetermined voltage VP but the master controller 202 does not transmit the first command to the slave controller 204, the master controller 202 continues to detect the node voltage VNO again in step 304. In step 310, when the node voltage VNO is less than the predetermined voltage VP and the master controller 202 is to transmit the first command to the slave controller 204, the master controller 202 enters a transmitter state, the slave controller 204 enters a receiver state, and the node voltage VNO is increased correspondingly according to the first command. In step 314, after the slave controller 204 receives and executes the first command, the slave controller 204 transmits a first backhaul signal to the master controller 202 via the pin CTRLB in response to the first command being issued, wherein the first backhaul signal is a signal corresponding to the first command. Therefore, when the master controller 202 does not receive the first backhaul signal, the master controller 202 performs step 312 again to transmit the first command to the slave controller 204, and when the master controller 202 receives the first backhaul signal, the master controller 202 performs step 304 again to continue detecting the node voltage VNO. Additionally, in step 316, when the node voltage VNO is greater than the predetermined voltage VP, it means that the second command is transmitted from the controller 204 to the master controller 202, so that the slave controller 204 enters the transmitter state, the master controller 202 enters the receiver state, and the node voltage VNO is correspondingly increased according to the second command. In step 318, the master controller 202 receives the second command transmitted from the slave controller 204, and the master controller 202 executes the second command and transmits a second backhaul signal to the slave controller 204 via the pin CTRLA, wherein the second backhaul signal is a signal corresponding to the second command. In addition, after the master controller 202 executes the second command and transmits the second backhaul signal to the slave controller 204 via the pin CTRLA, the master controller 202 continues to detect the node voltage VNO again in step 304.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating a timing sequence of a method for transmitting and receiving commands between the master controller 202 and the slave controller 204, wherein fig. 3 is an example in which the controller is the master controller 202 and the other controller is the slave controller 204. As shown in fig. 3, at a time T1, when the node voltage VNO is between the predetermined voltage VP and the over-temperature protection reference voltage VOTP (which means that no command is transmitted between the master controller 202 and the slave controller 204 and the master controller 202 does not perform the over-temperature protection on the power converter 100), the master controller 202 may transmit the first command to the slave controller 204, wherein the master controller 202 enters the transmitter state, the slave controller 204 enters the receiver state, the node voltage VNO is correspondingly increased to a corresponding voltage VCT according to the first command (for example, when the first command is the high ac voltage command ACHL, the corresponding voltage VCT is between 4.2V and 4.7V), and the enabled period of the first command is 120 μ s. The present invention is not limited to the first instruction having an enable period of 120 mus. 60 μ s after receiving the first instruction from the controller 204, the controller 204 begins executing the first instruction at a time T2. Additionally, as shown in FIG. 3, at a time T3, 120 μ s after the first command is executed by the controller 204, the controller 204 transmits the first backhaul signal to the master controller 202, wherein the enabled period of the first backhaul signal is 120 μ s. However, the present invention is not limited to the enabling period of the first backhaul signal being 120 μ s. In addition, since the first backhaul signal corresponds to the first instruction, the node voltage VNO also increases to a corresponding voltage VCT during the enabling of the first backhaul signal. Additionally, as shown in FIG. 3, the master controller 202 may transmit the first command to the slave controller 204 again at time T5 when the first backhaul signal has not been received at 240 μ s (time T5) after the master controller 202 transmits the first command to the slave controller 204. As shown in FIG. 3, 120 μ s after the enabling period of the first backhaul signal expires (time T6), if no command is transmitted between the master controller 202 and the slave controller 204 wants to transmit the second command to the master controller 202, the slave controller 204 can enter the transmitter state to transmit the second command to the master controller 202. Additionally, as shown in FIG. 3, after the master controller 202 starts receiving the first feedback signal for 300 μ s (a time T7), if no instruction is transmitted between the master controller 202 and the slave controller 204 and the master controller 202 wants to transmit the first instruction or another first instruction to the slave controller 204, the master controller 202 may enter the transmitter state again to transmit the first instruction or the another first instruction to the master controller 202. In addition, the present invention is not limited to the timing of the method for receiving and sending commands between the master controller 202 and the slave controller 204 as shown in fig. 3, that is, it is within the scope of the present invention as long as each of the plurality of first commands and the plurality of second commands corresponds to a predetermined voltage range and the master controller 202 can perform at least one predetermined function (e.g., the over-temperature protection) through the pin CTRLA. In addition, the length of the enable period of the first instruction and the length of the enable period of the first backhaul signal may be the same or different.

In addition, each of the plurality of first instructions and the plurality of second instructions corresponds to a predetermined voltage range. For example, when the first commands are an AC brown-in command ACBI, an AC brown-out command ACBO, a PFC burst mode in command PFCBMI, a PFC burst mode out command PFCBMO, a low AC voltage (AC low line) command ACLL, and a high AC voltage (AC high line) command ACHL, the AC brown-out command ACBI, the AC brown-out command ACBO, the burst mode command PFCBMI, the leaving burst mode command PFCBMO, the low AC voltage ACLL, and the high AC voltage command ACHL correspond to 1.7V-2.2V, 2.2V-2.7V, 2.7V-3.2V, 3.2V-3.7V, 3.7V-4.2V, 4.2V-4.7V, wherein the AC brown-out command ACBI, the AC brown-out command and the AC brown-out command CBMI command, the command PFCBMO leaving burst mode, the low ac voltage ACLL, and the command ACHL high ac voltage are transmitted to the slave controller 204 through the control interface 2024 and the pin CTRLA of the master controller 202. Therefore, after receiving ac over-voltage command ACBI, ac under-voltage command ACBO, low ac voltage ACLL, and high ac voltage command ACHL from control interface 2042 of controller 204 via pin CTRLB, control interface 2042 will transmit ac over-voltage command ACBI, ac under-voltage command ACBO, low ac voltage ACLL, and high ac voltage command ACHL to the corresponding circuits in control interface 2042. In addition, the first commands are not limited to the ac voltage over-voltage command ACBI, the ac voltage under-voltage command ACBO, the burst mode entering command PFCBMI and the burst mode leaving command PFCBMO, the low ac voltage ACLL, and the high ac voltage command ACHL, and are not limited to the predetermined voltage ranges corresponding to the ac voltage over-voltage command ACBI, the ac voltage under-voltage command ACBO, the burst mode entering command PFCBMI and the burst mode leaving command PFCBMO, the low ac voltage ACLL, and the high ac voltage command ACHL. In addition, the principle of the plurality of second instructions may refer to the above description of the plurality of first instructions, and is not described herein again.

In another embodiment of the present invention, fig. 2 may also take the controller as the slave controller 204 and the other controller as the master controller 202 as an example, and the following details are described as follows:

in step 302, the slave controller 204 starts. Additionally, since the over-temperature protection is performed by the master controller 202, the slave controller 204 omits the step 304 and directly performs the step 306. In step 306, after the master controller 202 does not perform the over-temperature protection on the power converter 100, the slave controller 204 detects whether the node voltage VNO is also less than the predetermined voltage VP, wherein the node voltage VNO is less than the predetermined voltage VP when no command is transmitted between the master controller 202 and the slave controller 204. In step 308, when the node voltage VNO is less than the predetermined voltage VP but the slave controller 204 does not transmit the first command to the master controller 202, the slave controller 204 again executes step 306 to continue detecting the node voltage VNO. In step 310, when the node voltage VNO is less than the predetermined voltage VP and the slave controller 204 transmits the first command to the master controller 202, the slave controller 204 enters the transmitter state, and the master controller 202 enters the receiver state, and the node voltage VNO is correspondingly increased according to the first command. In step 314, after the master controller 202 receives and executes the first command, the master controller 202 should send the first backhaul signal to the slave controller 204 via the pin CTRLA. Therefore, when the slave controller 204 does not receive the first backhaul signal, the slave controller 204 performs step 312 again to transmit the first command to the master controller 202, and when the slave controller 204 receives the first backhaul signal, the slave controller 204 performs step 306 again to continue detecting the node voltage VNO. In addition, in step 316, when the node voltage VNO is greater than the predetermined voltage VP, it means that the master controller 202 transmits the second command to the slave controller 204, so that the master controller 202 enters the transmitter state, the slave controller 204 enters the receiver state, and the node voltage VNO is correspondingly increased according to the second command. In step 318, the slave controller 204 receives the second command transmitted by the master controller 202, and the slave controller 204 executes the second command and transmits the second return signal to the master controller 202 through the pin CTRLB. In addition, after the slave controller 204 executes the second command and transmits the second backhaul signal to the master controller 202 via the pin CTRLB, the slave controller 204 again executes step 306 to continue detecting the node voltage VNO.

Fig. 4-6 are schematic diagrams illustrating the command transmitting and receiving method applied to start the power converter 100, fig. 5 is a schematic diagram illustrating the command transmitting and receiving method applied to high/low alternating current (AC high/low line), and fig. 6 is a schematic diagram illustrating the command transmitting and receiving method applied to turn off the power converter 100. As shown in fig. 4, when the ac power supply (not shown in fig. 1) starts to provide the ac voltage VAC, the dc voltage VHV at the pin HV of the main controller 202 may correspondingly change according to the ac voltage VAC. Therefore, when the dc voltage VHV is greater than the overvoltage voltage VACBNI (at time T1), the related circuits in the master controller 202 generate an AC over-voltage (AC brown-in) command ACBI and transmit the AC over-voltage command ACBI to the slave controller 204 via the pins CTRLA and CTRLB to enable the slave controller 204 to control the power factor correction stage 104 to start operating according to the AC over-voltage command ACBI. As shown in fig. 4, the node voltage VNO is correspondingly increased to a corresponding voltage VCT1 (1.7V-2.2V) according to the ac over-voltage command ACBI, and the controller 204 transmits a feedback signal RACBI corresponding to the ac over-voltage command ACBI to the master controller 202 at a time T2, wherein the node voltage VNO is also correspondingly increased to the corresponding voltage VCT1 according to the feedback signal RACBI during the enabled period of the feedback signal RACBI (time T2-time T3).

Since the dc voltage VHV may correspondingly vary with the ac voltage VAC, the dc voltage VHV may correspondingly increase as the ac voltage VAC increases, and the dc voltage VHV may correspondingly decrease as the ac voltage VAC decreases. Therefore, as shown in fig. 5, after a time T1, the dc voltage VHV starts to cross over a high AC voltage reference voltage VACHL, so that the related circuits in the master controller 202 generate a high AC voltage (AC high line) command ACHL at a time T2 and transmit the command ACHL to the slave controller 204 through the pins CTRLA and CTRLB to enable the slave controller 204 to control the power factor correction stage circuit 104 to start operating according to the high AC voltage command ACHL, wherein a delay time TD1 is between the time T1 and the time T2. As shown in fig. 5, the node voltage VNO is correspondingly increased to a corresponding voltage VCT2 (4.2V-4.7V) according to the ac high voltage command ACHL, and the controller 204 transmits a return signal RACHL corresponding to the ac high voltage command ACHL to the main controller 202 at a time T3, wherein the node voltage VNO is also correspondingly increased to the corresponding voltage VCT2 according to the return signal RACHL during the enabled period of the return signal RACHL (time T3-time T4). As shown in fig. 5, after a time T5, the dc voltage VHV starts to be lower than a low AC voltage reference voltage VACLL, so the related circuits in the master controller 202 generate a low AC voltage (AC low line) command ACLL at a time T6 and transmit the low AC voltage command ACLL to the slave controller 204 through the pins CTRLA and CTRLB to enable the slave controller 204 to control the power factor correction stage 104 to start operating according to the low AC voltage command ACLL, wherein a delay time TD2 is between the time T5 and the time T6, and the delay time TD1 and the delay time TD2 may be the same or different. As shown in fig. 5, the node voltage VNO increases to a corresponding voltage VCT3 (3.7V-4.2V) in response to the ac low voltage command ACLL, and transmits a return signal RACLL corresponding to the ac low voltage command ACLL from the controller 204 to the main controller 202 at a time T7, wherein the node voltage VNO also increases to the corresponding voltage VCT3 in response to the return signal RACLL during the activation period of the return signal RACLL (time T7-time T8).

In addition, as shown in fig. 6, when the dc voltage VHV is less than the brown-out voltage vacbon for a delay time TD3, the related circuits in the master controller 202 will generate an AC brown-out command ACBO at a time T1 and transmit the AC brown-out command ACBO to the slave controller 204 via the pins CTRLA and CTRLB, so that the slave controller 204 controls the power factor correction stage circuit 104 to start to turn off according to the AC brown-out command ACBO. As shown in fig. 6, the node voltage VNO is correspondingly increased to a corresponding voltage VCT4 (2.2V-2.7V) according to the ac brownout command ACBO, and the controller 204 transmits a feedback signal RACBO corresponding to the ac brownout command ACBO to the main controller 202 at a time T2, wherein the node voltage VNO is also correspondingly increased to the corresponding voltage VCT4 according to the feedback signal RACBO during the activation period of the feedback signal RACBO (time T2-time T3).

In summary, the method for receiving and sending commands disclosed in the present invention is to correspond each command of a plurality of commands transmitted between the master controller and the slave controller to a predetermined voltage range, and the pin of the master controller for transmitting the plurality of commands corresponds to at least one predetermined function (e.g., the over-temperature protection). Therefore, compared with the prior art, the method for receiving and sending the instructions disclosed by the invention has the advantages that the operation is simple, a plurality of instructions are covered, and the main controller and the slave controller do not need additional pins to execute the method.

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 (14)

1. A method for transmitting and receiving commands between a master controller and a slave controller of a power converter comprises the following steps: starting the master controller and the slave controller;

it is characterized by also comprising:

one of the master controller and the slave controller detects a node voltage on a pin of the controller;

when the node voltage is smaller than a preset voltage, the controller transmits a first instruction in a plurality of first instructions to the other controller of the master controller and the slave controller through the pin, wherein the preset voltage is related to the over-temperature protection of the power converter; and

and after the controller receives the first return signal transmitted by the other controller, the controller detects the node voltage again.

2. A method for transceiving instructions according to claim 1, wherein: the controller enters a transmitter state and the other controller enters a receiver state.

3. A method for transceiving instructions according to claim 1, wherein: the first echo signal is a signal corresponding to the first instruction.

4. The method of claim 1, further comprising:

when the controller does not receive the first return signal, the controller transmits the first command to the other controller again.

5. The method of claim 1, further comprising:

when the node voltage is less than the predetermined voltage, if the controller does not transmit the first command to the other controller through the pin, the controller detects the node voltage again.

6. The method of claim 1, further comprising:

when the node voltage is greater than the predetermined voltage, the controller enters a receiver state, the controller receives a second instruction of a plurality of second instructions transmitted by the other controller, and the controller detects the node voltage again after executing the second instruction and transmitting a second return signal to the other controller through the pin, wherein the second return signal is a signal corresponding to the second instruction.

7. A method for transceiving instructions according to claim 1, wherein: and after the other controller executes the first instruction, transmitting the first return signal to the controller through a pin of the other controller.

8. A method for transceiving instructions according to claim 1, wherein: the main controller controls a pulse width modulation stage circuit in the power converter, and the other controller controls a power factor correction stage circuit in the power converter.

9. A method for transceiving instructions according to claim 1, wherein: when the controller is the main controller, the controller additionally judges whether to execute over-temperature protection on the power converter.

10. A method for transmitting and receiving commands between a master controller and a slave controller of a power converter comprises the following steps: starting the master controller and the slave controller;

it is characterized by also comprising:

one of the master controller and the slave controller detects a node voltage on a pin of the controller;

when the node voltage is smaller than a preset voltage, the controller transmits a first instruction in a plurality of first instructions to the other controller in the master controller and the slave controller through the pin, wherein each first instruction in the plurality of first instructions corresponds to a preset voltage range; and

and after the controller receives the first return signal transmitted by the other controller, the controller detects the node voltage again.

11. The method of claim 10, further comprising:

when the controller does not receive the first return signal, the controller transmits the first command to the other controller again.

12. The method of claim 10, further comprising:

when the node voltage is less than the predetermined voltage, if the controller does not transmit the first command to the other controller through the pin, the controller detects the node voltage again.

13. The method of claim 10, further comprising:

when the node voltage is greater than the predetermined voltage, the controller enters a receiver state, the controller receives a second instruction of a plurality of second instructions transmitted by the other controller, and the controller detects the node voltage again after executing the second instruction and transmitting a second return signal to the other controller through the pin, wherein the second return signal is a signal corresponding to the second instruction.

14. A method for transceiving instructions according to claim 10, wherein: when the controller is the main controller, the controller additionally judges whether to execute over-temperature protection on the power converter.

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