WO2019019082A1

WO2019019082A1 - Method and system for detecting switch adhesion of output end of power module

Info

Publication number: WO2019019082A1
Application number: PCT/CN2017/094641
Authority: WO
Inventors: 戴国峰; 邓纯发
Original assignee: 深圳驿普乐氏科技有限公司
Priority date: 2017-07-27
Filing date: 2017-07-27
Publication date: 2019-01-31

Abstract

A method and system for detecting switch adhesion of the output end of a power module (20). The system comprises at least one power module (20) for powering a load (60), at least one first switch module (30), a sense resistor (Ry), a control module (10), and a voltage sampling module (50) used for detecting the voltage of the sense resistor (Ry). The first switch module (30) comprises a first switch (KA) and a first resistor (Ra) connected in parallel to the first switch (KA); the output end of the power module (20), the first switch module (30), and the sense resistor (Ry) are connected in series; the control module (10) controls on and off of the first switch (KA) and determines whether the first switch (KA) is adhered according to the voltage of the sense resistor (Ry) when the first switch (KA) is turned off. Since the first switch (KA) and the first resistor (Ra) are connected in parallel, whether the first switch (KA) is adhered or not affects the voltage of the sense resistor (Ry), so that whether the first switch (KA) is adhered can be determined by detecting the voltage of the sense resistor (Ry) when the first switch (KA) is turned off, without an auxiliary contact switch, thereby lowering the costs and improving the safety of the system.

Description

Method and system for detecting adhesion of output switch of power module

Technical field

The present invention relates to the field of power supply, and in particular, to a method and system for detecting adhesion of a switch at an output end of a power module.

Background technique

In the high-power electric vehicle DC charging pile system, several DC modules are often connected in parallel on a DC bus. The output of the DC module is connected with the DC bus and the DC contactor is commonly used to disconnect. The DC contactor is a kind of voltage that can cut off the voltage. The current switching device has the advantages of simple structure and convenient control, but its disadvantage is that when the large current is cut off, the two ends of the contacts may be stuck due to the spark generated by the arcing, and the two ends may not be effectively disconnected, thereby causing system failure and serious Personal safety incidents may occur.

For the problem of contact sticking, the contactor's solution is to add a set of auxiliary contacts that act synchronously with the main contact for the main contact glue feedback.

As shown in Figure 1, the output of the DC module and the DC bus DC+ and DC- are connected by DC contactors (K1A, K1B-KNA, KNB), and each DC contactor has a set of auxiliary contacts (K1AOF, K1BOF). - KNAOF, KNBOF), the auxiliary contact of the contactor is synchronized with the main contact, and the control system determines the state of the DC contactor by detecting the state of the auxiliary contact, if the state of the auxiliary contact and the state of the primary auxiliary point are detected Inconsistent, an alarm. The disadvantage of this type of detection method is that each DC contactor must have a set of auxiliary contacts, while DC contactors with auxiliary contacts are much more expensive than DC contactors without auxiliary contacts.

In order to save costs, RELAY (relay) is usually used instead of DC contactor, but RELAY has no auxiliary contacts. It is difficult to detect whether the main contact of RELAY is stuck.

Therefore, the prior art has yet to be improved and improved.

Summary of the invention

The invention mainly provides a method and a system for detecting adhesion of a switch of an output end of a power module, which does not require an auxiliary contact switch and has low cost.

According to a first aspect, an embodiment provides a method for detecting adhesion of a switch of an output of a power module. The system includes: at least one power module for supplying power to the load, at least one first switch module, a detecting resistor, a control module, and a voltage sampling module for detecting the voltage of the detecting resistor; the first switch module includes the first a switch and a first resistor in parallel with the first switch;

The output end of the power module, the first switch module and the detecting resistor are connected in series;

The control module controls opening and closing of the first switch, and determines whether the first switch is stuck according to a voltage of the detecting resistor when the first switch is turned off.

According to a second aspect, an embodiment provides a method for detecting adhesion of a switch of an output of a power module, including the following steps:

The voltage sampling module detects the voltage of the detecting resistor;

The control module controls the first switch to be turned off; determining whether the first switch is stuck according to the voltage of the detecting resistor when the first switch is turned off.

According to the method and system for detecting the adhesion of the output end of the power module according to the above embodiment, since the first switch and the first resistor are connected in parallel, the adhesion of the first switch affects the voltage of the detecting resistor, thereby detecting the The voltage of the detecting resistor when the first switch is turned off is used to judge whether the first switch is stuck or not, and the auxiliary contact switch is not needed, thereby achieving low cost and improving the safety of the system.

DRAWINGS

1 is a circuit diagram of a conventional contactor adhesion detecting circuit;

2 is a schematic circuit diagram of Embodiment 1 in a system for detecting adhesion of an output terminal of a power module according to the present invention;

3 is a schematic circuit diagram of Embodiment 2 in a system for detecting adhesion of a switch of an output end of a power module according to the present invention;

4 is a flow chart of a method for detecting adhesion of a switch at an output end of a power module according to the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings. Similar elements in different embodiments employ associated similar component numbers. In the following embodiments, many of the details are described in order to provide a better understanding of the application. However, those skilled in the art can easily realize that some of the features may be omitted in different situations, or may be replaced by other components, materials, and methods. In some cases, some operations related to this application have not been shown or described in the specification, in order to avoid excessive description of the core part of the application. The description is submerged, and it is not necessary for those skilled in the art to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the field.

In addition, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially changed or adjusted in a manner that can be apparent to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of describing a particular embodiment, and are not intended to

The serial numbers themselves for the components herein, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. As used herein, "connected" or "coupled", unless otherwise specified, includes both direct and indirect connections (joining).

Referring to FIG. 2, the system (circuit) for detecting the adhesion of the output end of the power module module includes: at least one power module 20 for supplying power to the load, at least one first switch module (circuit) 30, and a detecting resistor. Ry, a load switch K1, a control module 10, and a voltage sampling module (circuit) 50 for detecting the voltage of the detecting resistor Ry. The first switch module 30 includes a first switch KA and a first resistor Ra connected in parallel with the first switch KA.

Example 1:

In this embodiment, the power module 20 and the first switch module 30 are provided with N, that is, N power modules 20 (power modules 1-N), N first switches KA (K1A-KNA), and N first resistors. Ra (R1a-Rna); a power module 20 is correspondingly connected to a first switch module 30, where N is an integer greater than or equal to 1.

In this embodiment, the power module 20 uses a DC module, that is, outputs DC power.

The output end of the power module 20, the corresponding first switch module 30 and the detecting resistor Ry are connected in series. Specifically, an output end of the power module 20 is connected to the power positive bus or the power negative bus through the first switch module 30, and the detecting resistor Ry is connected in series between the positive power bus and the negative power bus. The two sampling inputs of the voltage sampling module 50 are respectively connected to two ends of the detecting resistor Ry, and the output of the voltage sampling module 50 is connected to the input end of the control module 10. An output of the control module 10 is connected to the control terminal of the first switch KA. In this embodiment, the positive power bus of the power supply is the positive line DC+ of the DC bus, the negative power line of the power supply is the negative line DC- of the DC bus, and the positive and negative lines are connected to the load 60. The first switch KA is a relay switch, and the control end of the first switch KA is a coil of the relay.

The voltage sampling module 50 samples the voltage of the detecting resistor Ry, and can adopt conventional electricity. Pressure sampling circuit.

The load switch K1 is used to control the power supply of the load 60. The load switch K1 is disposed on the positive line DC+ of the DC bus or the negative line DC- of the DC bus between the detecting resistor Ry and the load 60, and is set in this embodiment. On the positive line DC+ of the DC bus.

The control module 10 is used to control the opening and closing (switching) of the first switch KA, and of course can also be used to control the opening and closing of the load switch K1; before the load switch K1 is closed, the power bus is included (including All the first switches KA on the power positive bus and the negative power bus of the power supply perform adhesion detection, and after determining that the first switch KA is not stuck, the load switch K1 is closed. The adhesion detection specifically includes: the control module 10 determining whether the first switch KA is stuck according to the voltage of the detecting resistor Ry when the first switch KA is turned off.

Since the first switch KA and the first resistor Ra are connected in parallel, the adhesion of the first switch KA affects the voltage of the detecting resistor Ry, that is, the first switch KA is closed to open, and if adhesion occurs, the process is in progress. The voltage of Ry does not change significantly. Therefore, by detecting the voltage of the detecting resistor Ry when the first switch KA is turned off, it is determined whether the first switch KA is stuck or not, and the auxiliary contact switch is not needed, thereby achieving low cost and improving the system. safety.

Further, the control module 10 may employ a single chip microcomputer (MCU), which includes a driving unit and a comparison determining unit. This embodiment only considers the manner in which the output of the power module 20 is controlled by one switch. The drive unit is for controlling the opening and closing of the first switch KA. The comparison judging unit is configured to control the opening and closing of the first switch KA by the driving unit; before the load switch K1 is closed, first perform adhesion detection on all the first switches KA on the power bus, and determine all the first After the switch KA is not stuck, the load switch K1 is closed. Specifically, the comparison determining unit activates the power module 1, detects whether the first switch K1A between the module and the bus is stuck, and turns off the power module 1 after detecting; starts the power module 2, and detects the number between the module and the bus. Whether a switch K2A has adhesive or not, after the detection, the power module 2 is turned off; ...; the power module N is activated, and the first switch KNA between the module and the bus is detected to be non-adhesive, and the power module N is turned off after the detection; When K1A, K2A, ..., KNA are normal, the load switch K1 is closed according to user needs or system requirements, and one, multiple or all power modules are selected to power the load 60.

The comparison determining unit performs the adhesion detection on the first switch KA, specifically: determining whether the first resistor Ra is short-circuited according to the voltage of the detecting resistor Ry when the first switch KA is turned off, if the first resistor Ra is still in the The short circuit state indicates that the first switch KA is stuck, and an instruction (error) for triggering the first switch KA to be stuck with the alarm prompt is output. The system also includes an alarm module for receiving comparative judgments The unit outputs an instruction to emit an audible, optical or electrical alarm to prompt the user to stick the first switch KA.

The driving unit is connected to the control end of the first switch KA, and the input end of the comparison determining unit is connected to the output end of the voltage sampling module 50.

Further, the adhesion detection of the comparison determination unit is specifically: comparing whether the voltage of the detection resistor Ry when the first switch KA is off is close to the first preset voltage, and the first switch KA is considered not to be adhered when approaching, and the output is The first switch KA is not glued. After the alarm module obtains the instruction, it can do nothing, and can also issue corresponding sound and light or electrical signals to prompt the user. The first preset voltage is

Where R _y is the resistance of the sense resistor. R _{total 1} is the total resistance of the loop formed by the output end of the power module 20 when the first switch KA is completely disconnected. In this embodiment, R _{total 1} = Ra + Ry. V ₁ is the output voltage of the power module 20. Whether the voltage of the detecting resistor Ry when the first switch KA is turned off is close to the first preset voltage may be determined by comparing, for example, comparing the voltage of the detecting resistor Ry when the first switch KA is turned off and the first The difference between the preset voltages is considered to be unbonded when the difference does not exceed the preset first difference range. Of course, the difference between the voltage of the detecting resistor Ry when the first switch KA is turned off and V ₁ may be compared, and when the difference does not exceed the preset first difference range, the first switch KA is considered to be sticky. Even, the instruction to stick the first switch KA is output. The first difference range is plus or minus 10% of the first preset voltage, that is,

Theoretically, the first difference range should be close to 0. Considering the error of the resistance, the positive and negative tenths of the first preset voltage are selected. Preferably, the first difference range may be set to be plus or minus 5% of the first preset voltage.

It can be seen that the system provided by the present invention determines whether the RELAY has adhesion by using the resistance voltage dividing principle to sample the two-terminal voltage of the resistor at the second end of the RELAY, and replaces the contactor with the RELAY and has the RELAY contact adhesion detection function. The magnitude reduces costs.

Example 2:

As shown in FIG. 3, the system further includes at least one second switch module 40, the second switch module 40 including a second switch KB and a second resistor Rb in parallel with the second switch KB. In this embodiment, the power module 20, the first switch module 30, and the second switch module 40 are provided with N, that is, N power modules 20 (power modules 1-N), and N first switches KA (K1A-KNA) , N first resistors Ra (R1a-Rna), N second switches KB (K1B-KNB), N second resistors Rb (R1b-Rnb); one power module 20 is connected to a first switch module 30 and a second switch module 40, Where N is an integer greater than or equal to 1.

In this embodiment, the power module 20 uses a DC module, that is, outputs DC power. The positive output terminal of the power module 20 is connected to the positive power bus of the power supply through the first switch KA and the first resistor Ra. The positive power bus of the power supply is connected to the negative power bus of the power supply through the detecting resistor Ry, and the negative power bus of the power supply passes through the second switch KB and the second resistor. Rb is connected to the negative output terminal of the power module 20. The negative output terminal of the power module 20 is grounded.

The two sampling inputs of the voltage sampling module 50 are respectively connected to two ends of the detecting resistor Ry, and the output of the voltage sampling module 50 is connected to the input end of the control module 10. In this embodiment, the positive power bus of the power supply is the positive line DC+ of the DC bus, the negative power line of the power supply is the negative line DC- of the DC bus, and the positive and negative lines are connected to the load 60. The first switch KA and the second switch KB are both relay switches, and the control ends of the first switch KA and the second switch KB are the coils of the relay.

The control module 10 is configured to control the opening and closing (switching) of the first switch KA and the second switch KB, and of course can also be used to control the opening and closing of the load switch K1; before the load switch K1 is closed, Performing adhesion detection on all the first switch KA and the second switch KB on the power bus (including the power positive bus and the negative power bus), and then closing the first switch KA and the second switch KB after the first switch KA and the second switch KB are not adhered Load switch K1. The adhesion detection specifically includes: the control module 10 determining whether the first switch KA is stuck according to the voltage of the detecting resistor Ry when the first switch KA is turned off, according to the detecting resistor Ry being in the second switch KB The voltage at the time of disconnection determines whether the second switch KB is stuck. The adhesion detection of the first switch KA and the second switch KB by the control module 10 may be performed separately or simultaneously; when separately, the switch that does not need to be detected is closed, and the switch that needs to be detected is turned off for detection. The process has been described in detail in the previous embodiment and will not be described herein. This embodiment mainly describes the adhesion detection of the first switch KA and the second switch KB at the same time. In other words, the first switch KA and the second switch KB are linked. An output of the control module 10 is connected to the control terminal of the first switch KA and the control terminal of the second switch KB.

Further, the control module 10 includes a driving unit and a comparison determining unit.

This embodiment uses two switches to control the output of the power module 20. The drive unit is used for The opening and closing of the first switch KA and the second switch KB are controlled. The comparison judging unit is configured to control opening and closing of the first switch KA and the second switch KB by the driving unit; before the load switch K1 is closed, first all the first switch KA and the second switch KB on the power bus The adhesion detection is performed, and after the first switch KA and the second switch KB are judged to be unbonded, the load switch K1 is closed. Specifically, the comparison determining unit activates the power module 1, detects whether the first switch K1A and the second switch K1B between the module and the bus are stuck, and turns off the power module 1 after detecting; starts the power module 2, detects the module and Whether the first switch K2A and the second switch K2B between the buses are stuck, and after the detection, the power module 2 is turned off; ...; the power module N is activated, and the first switch KNA and the second switch between the module and the bus are detected. KNB has no adhesion, after the detection, turn off the power module N; when K1A, K1B, ..., KNA, KNB are normal, according to user needs or system needs, close the load switch K1, and choose to start one or more groups or All power modules supply power to load 60.

The comparison determining unit performs adhesion detection on the first switch KA and the second switch KB, specifically: determining whether the first resistor Ra is short-circuited according to the voltage of the detecting resistor Ry when the first switch KA is turned off. When the resistance Ra is still in the short circuit state, the first switch KA is stuck, and the command for triggering the first switch KA to be stuck with the alarm prompt is output; and the voltage is determined according to the voltage of the detecting resistor Ry when the second switch KB is turned off. Whether the two resistors Rb are short-circuited, and if the second resistor Rb is still in a short-circuit state, an instruction for triggering the second switch KB sticking alarm prompt is output. The system further includes an alarm module for receiving an instruction output by the comparison determination unit to issue an audible, optical or electrical alarm to prompt the user to stick the first switch KA and/or the second switch KB.

The driving unit is connected to the control end of the first switch KA and the control end of the second switch KB, and the input end of the comparison determining unit is connected to the output end of the voltage sampling module. The drive unit is also connected to the comparison determination unit.

Further, the adhesion detection of the comparison determination unit is specifically: comparing the difference between the voltage of the detection resistor Ry when the first switch KA and the second switch KB are disconnected and the first preset voltage, where the difference is not When the preset first difference range is exceeded, an instruction that the first switch KA and the second switch KB are not stuck is output. The first preset voltage is

Where R _y is the resistance of the sense resistor, and R _{total 1} is the total resistance of the loop formed by the output of the power module when the first switch KA and the second switch KB are completely disconnected. In this embodiment, R _{total 1} = Ra + Rb + Ry; V ₁ is the output voltage of the power module 20. The first difference range is plus or minus 10% of the corresponding preset voltage, in other words, the first difference range is

Preferably, the first difference range is plus or minus 5% of the first preset voltage. When the first switch KA and the second switch KB are disconnected, if the first switch KA and the second switch KB are not adhered, the output terminals of the power module are connected in series with three resistors of Ra, Ry and Rb; if the first switch KA and/or When the second switch KB is stuck, Ra and/or Rb are short-circuited, so whether the switch is stuck or not affects the voltage of Ry, so that the switch can be judged according to the voltage of Ry.

The comparison determining unit compares a difference between a voltage of the detecting resistor Ry when the first switch KA and the second switch KB is turned off and a second preset voltage, where the difference does not exceed a preset second difference. In the range, outputting an instruction for triggering the second switch KB to be attached to the alert prompt; the second preset voltage is

Wherein, R _{total 2} is the total resistance of the loop formed by the output end of the power module 20 when the first switch KA is completely disconnected and the second switch KB is closed. In this embodiment, R _{total 2} = Ra + Ry. The second difference range is plus or minus 10% of the corresponding preset voltage, in other words, the second difference range is

Preferably, the second difference range is plus or minus 5% of the second preset voltage.

The comparison determining unit compares a difference between a voltage of the detecting resistor Ry when the first switch KA and the second switch KB is turned off and a third preset voltage, where the difference does not exceed a preset third difference. In the range, outputting an instruction for triggering the first switch KA to be attached to the alert prompt; the third preset voltage is

Wherein, R _{total 3} is the total resistance of the loop formed by the power module output terminal when the first switch KA is closed and the second switch KB is completely disconnected. In this embodiment, R _{total 3} = Rb + Ry. The third difference range is plus or minus 10% of the corresponding preset voltage, in other words, the third difference range is

Preferably, the third difference range is plus or minus 5% of the third preset voltage. The resistances of the first resistor Ra and the second resistor Rb may be the same or different. If the resistances of the first resistor Ra and the second resistor Rb are the same, the second preset voltage and the third preset voltage are the same, and only the One of the first switch KA and the second switch KB is stuck, and it is impossible to determine which of the switches is stuck. Therefore, in the present embodiment, the resistances of the first resistor Ra and the second resistor Rb are different.

The comparison determining unit compares a difference between a voltage of the detecting resistor Ry when the first switch KA and the second switch KB is disconnected and a voltage output by the power module, where the difference does not exceed a preset fourth difference. In the range, an instruction for triggering the first switch KA and the second switch KB to be attached to the alarm prompt is output. The fourth difference range is plus or minus 10% of the corresponding preset voltage. In other words, the fourth difference range is -0.1×V ₁ to 0.1×V ₁ . Preferably, the fourth difference range is plus or minus 5% of the fourth preset voltage.

It can be seen that the system provided by the present invention determines the presence or absence of adhesion of the relay switch by using the resistance division principle at the two ends of the relay switch, and using the resistance division principle to sample the two terminals of the resistor, and replaces the contactor with a relay switch and has a relay contact switch. Even the detection function greatly reduces the cost.

Based on the system provided by the foregoing embodiment, the present invention further provides a method for detecting the adhesion of the switch of the output end of the power module. As shown in FIG. 4, the method includes the following steps:

S10. The control module 10 performs adhesion detection on all the first switches KA on the power bus before the load switch K1 is closed, and then closes the load switch K1 after determining that all the first switches KA are not stuck. Specifically, the control module 10 activates the power module 1, detects whether the first switch K1A between the module and the bus is stuck, and turns off the power module 1 after detecting; starts the power module 2, and detects the number between the module and the bus. Whether a switch K2A has adhesive or not, after the detection, the power module 2 is turned off; ...; the power module N is activated, and the first switch KNA between the module and the bus is detected to be non-adhesive, and the power module N is turned off after the detection; When K1A, K2A, ..., KNA are normal, the load switch K1 is closed according to user needs or system requirements, and one, multiple or all power modules are selected to power the load 60.

In the step S10, the control module 10 performs the adhesion detection on the first switch KA, which specifically includes:

S110. The voltage sampling module 50 detects the voltage of the detecting resistor Ry.

S120, the control module 10 controls the first switch KA to be disconnected; and determines whether the first switch KA is stuck according to the voltage of the detecting resistor Ry when the first switch KA is turned off.

Of course, the second switch KB can also be set on the power bus, and the step S10 is: before the load switch K1 is closed, firstly perform adhesion detection on all the first switch KA and the second switch KB on the power bus, in judging After all the first switch KA and the second switch KB are not bonded, the load switch K1 is closed. Specifically, the comparison determining unit activates the power module 1, detects whether the first switch K1A and the second switch K1B between the module and the bus are stuck, and turns off the power module 1 after detecting; starts the power module 2, detects the module and Whether the first switch K2A and the second switch K2B between the buses are stuck, and after the detection, the power module 2 is turned off; ...; the power module N is activated, and the module is detected between the bus and the bus. Whether the first switch KNA and the second switch KNB are stuck, and after the detection, the power module N is turned off; when K1A, K1B, ..., KNA, and KNB are normal, the load switch K1 is closed according to user needs or system requirements, and Select to power one, multiple, or all of the power modules to power load 60.

In the step S10, the control module 10 performs adhesion detection on the first switch KA and the second switch KB, and specifically includes:

S110', the voltage sampling module 50 detects the voltage of the detecting resistor Ry.

S120', the control module 10 controls the first switch KA and the second switch KB to be disconnected; and determines the first switch KA and the second switch according to the voltage of the detecting resistor Ry when the first switch KA and the second switch KB are turned off. Whether KB sticks. Specifically, the control module 10 determines whether the first resistor Ra is short-circuited according to the voltage of the detecting resistor Ry when the first switch KA is turned off. If the first resistor Ra is still in the short-circuit state, the first switch KA is stuck and outputted. An instruction for triggering the first switch KA to be stuck with the alarm prompt; determining whether the second resistor Rb is short-circuited according to the voltage of the detecting resistor Ry when the second switch KB is turned off, and outputting if the second resistor Rb is still in a short-circuit state An instruction to trigger a second switch KB to attach an alert prompt.

Since the features and principles of the method are described in detail in the foregoing system embodiment, details are not described herein again.

Those skilled in the art can understand that all or part of the functions of the various methods in the above embodiments may be implemented by hardware or by a computer program. When all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc. The computer executes the program to implement the above functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the above functions can be realized. In addition, when all or part of the functions in the above embodiment are implemented by a computer program, the program may also be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk or a mobile hard disk, and may be saved by downloading or copying. The system is updated in the memory of the local device, or the system of the local device is updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments may be implemented.

The invention has been described above with reference to specific examples, which are merely intended to aid the understanding of the invention and are not intended to limit the invention. Variations to the above-described embodiments may be made in accordance with the teachings of the present invention.

Claims

A system for detecting adhesion of an output switch of a power module, comprising: at least one power module for supplying power to a load, at least one first switch module, a detecting resistor, a control module, and detecting the detecting resistor a voltage sampling module of the voltage; the first switching module includes a first switch and a first resistor in parallel with the first switch;

The output end of the power module, the first switch module and the detecting resistor are connected in series;

The control module controls opening and closing of the first switch, and determines whether the first switch is stuck according to a voltage of the detecting resistor when the first switch is turned off.
A system for detecting adhesion of an output switch of a power module according to claim 1, wherein said system further comprises at least one second switch module, said second switch module comprising a second switch and being connected in parallel with said second switch Second resistance

The positive output terminal of the power module is connected to the positive power bus of the power supply through the first switch and the first resistor, and the positive bus of the power supply is connected to the negative power bus of the power supply through the detecting resistor, and the negative power bus of the power supply is connected to the negative pole of the power module through the second switch and the second resistor. Output

The control module is further configured to control opening and closing of the second switch, and determine whether the second switch is stuck according to a voltage of the detecting resistor when the second switch is turned off.
The system for detecting the adhesion of an output switch of a power module according to claim 1 or 2, wherein the control module determines whether the first switch is stuck according to a voltage of the detecting resistor when the first switch is turned off. Specifically, the method includes: determining, according to the voltage of the detecting resistor when the first switch is turned off, whether the first resistor is short-circuited, and if the first resistor is still in a short-circuit state, outputting an instruction for triggering the first switch adhesion alarm prompt.
The system for detecting the adhesion of the output switch of the power module according to claim 2, wherein the control module determines whether the second switch is stuck according to the voltage of the detecting resistor when the second switch is turned off, and specifically includes: And determining, according to the voltage of the detecting resistor when the second switch is turned off, whether the second resistor is short-circuited, and if the second resistor is still in the short-circuit state, outputting an instruction for triggering the second switch adhesion alarm prompt.
The system for detecting adhesion of an output switch of a power module according to claim 2, wherein the control module determines whether the first switch is stuck according to a voltage of the detecting resistor when the first switch is turned off, according to The voltage of the detecting resistor when the second switch is turned off to determine whether the second switch is stuck specifically includes:

Closing the first switch and the second switch, controlling the first switch and the second switch to be simultaneously turned off, and comparing a difference between a voltage of the detecting resistor when the switch is turned off and a first preset voltage, where the difference does not exceed And outputting, by the preset first difference range, an instruction that the first switch and the second switch are not stuck; the first preset voltage is
Where R y is the resistance of the sense resistor, and R total 1 is the total resistance of the loop formed by the output of the power module when the first switch and the second switch are completely disconnected, and V 1 is the output voltage of the power module;

And/or comparing a difference between a voltage of the detecting resistor when the switch is turned off and a second preset voltage, and when the difference does not exceed a preset second difference range, the output is used to trigger the second switch An instruction to adhere to an alert prompt; the second predetermined voltage is
Wherein, R total 2 is the total resistance of the loop formed by the output end of the power module when the first switch is completely opened and the second switch is closed;

And/or comparing a difference between a voltage of the detecting resistor when the switch is turned off and a third preset voltage, and when the difference does not exceed a preset third difference range, the output is used to trigger the first switch An instruction to adhere to an alert prompt; the third preset voltage is
Wherein, R total 3 is the total resistance of the loop formed by the output end of the power module when the first switch is closed and the second switch is completely disconnected;

And/or comparing a difference between a voltage of the detecting resistor when the switch is turned off and a voltage output by the power module, and when the difference does not exceed a preset fourth difference range, the output is used to trigger the first switch And the second switch is attached to the instruction of the alarm prompt.
The system for detecting adhesion of an output switch of a power module according to claim 5, wherein the first difference range, the second difference range, the third difference range, or the fourth difference range is a corresponding pre- Set the voltage to plus or minus 10%.
The system for detecting the adhesion of an output switch of a power module according to claim 5, wherein the resistances of the first resistor and the second resistor are different.
The system for detecting the adhesion of an output switch of a power module according to claim 2, wherein the system further comprises a load switch, the load switch being disposed between the detecting resistor and the load, the positive bus or the negative bus of the power supply. on.
The system for detecting the adhesion of the output switch of the power module according to claim 8, wherein the control module closes the load switch after determining that the first switch and the second switch are not adhered.
A method for detecting adhesion of a switch of an output end of a power module, characterized in that the method includes the following step:

The voltage sampling module detects the voltage of the detecting resistor;

The control module controls the first switch to be turned off; determining whether the first switch is stuck according to the voltage of the detecting resistor when the first switch is turned off.