Temperature detection device of multiphase switching power supply and multiphase switching power supply

Abstract

The invention relates to the technical field of switching power supplies, and discloses a temperature detection device of a multi-phase switching power supply and the multi-phase switching power supply, and the temperature detection device is characterized in that a controller is connected with a plurality of power modules of the multi-phase switching power supply, and the controller is connected with the plurality of power modules through a sampling and holding module; the controller sends the corresponding PWM signals to the corresponding power modules, the controller sends temperature sampling signals of the multiple power modules to the sampling holding module, and the PWM signals of the multiple power modules are synchronous with the temperature sampling signals of the multiple power modules; the sampling and holding module is used for holding the temperature of the plurality of power modules; when the sampling and holding module receives a temperature sampling signal of a certain power module, the sampling and holding module feeds back the temperature of the power module to the controller. According to the invention, the temperature sampling signals of the plurality of power modules are synchronized with the PWM signals of the plurality of power modules, so that the temperature of only one power module is fed back to the controller at any moment, and the temperature information of the currently driven power module can be accurately obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of switching power supplies, and in particular to a temperature detection device for a multi-phase switching power supply and a multi-phase switching power supply. Background Art

[0002] The multi-phase switching power supply has multiple built-in power modules (Driver and MOSFET, DrMos for short) that integrate drivers and metal oxide semiconductor field effect transistors (MOSFET). In recent years, with the continuous iteration of semiconductor technology, current detection and temperature detection have been gradually integrated into DrMos, providing a reliable solution for efficient power conversion and management, and meeting the growing computing needs and energy-saving requirements. The current detection of DrMos in the multi-phase switching power supply is fed back to the controller according to the number of phases, which can provide more accurate temperature control. However, the temperature detection is connected together by hardware, resulting in only the maximum value being fed back to the controller; the controller can only obtain the highest temperature of the DrMos and cannot see the temperature of each DrMos. Summary of the invention

[0003] In view of this, the present invention provides a temperature detection device for a multi-phase switching power supply and a multi-phase switching power supply to solve the problem of how to obtain the temperature of each power module in the multi-phase switching power supply.

[0004] In the first aspect, the present invention provides a temperature detection device for a multi-phase switching power supply, comprising: a controller and a sampling and holding module, wherein the controller is connected to multiple power modules of the multi-phase switching power supply, and the controller is connected to the multiple power modules through the sampling and holding module; the controller sends corresponding pulse width modulation signals to multiple corresponding power modules, and the controller sends temperature sampling signals of multiple power modules to the sampling and holding module, wherein the pulse width modulation signals of multiple power modules are synchronized with their temperature sampling signals; the sampling and holding module is used to maintain the temperatures of multiple power modules; when the sampling and holding module receives the temperature sampling signal of a certain power module, the sampling and holding module feeds back the temperature of the power module to the controller.

[0005] The present invention synchronizes the temperature sampling signals of multiple power modules with their pulse width modulation signals so that at any time only the temperature of one power module is fed back to the controller, thereby accurately acquiring the temperature information of the currently driven power module.

[0006] In an optional embodiment, the controller includes multiple pulse width modulation signal terminals and a temperature sampling signal terminal; each pulse width modulation signal terminal is connected to the control terminal of a power module of a multi-phase switching power supply; the controller sends the corresponding pulse width modulation signal to the corresponding power module through the corresponding pulse width modulation signal terminal; the controller sends the temperature sampling signal of the corresponding power module to the sampling and holding module through the temperature sampling signal terminal.

[0007] In an optional embodiment, the sampling and holding module has multiple feedback channels built in; the input end of each feedback channel is connected to a power module, and the output end of each feedback channel is connected to the temperature sampling signal end of the controller; each feedback channel is used to maintain the temperature sensed by the connected temperature sensing module; when the sampling and holding module receives the temperature sampling signal, the sampling and holding module feeds back the temperature maintained by the corresponding feedback channel to the controller.

[0008] In an optional embodiment, when a temperature sensing device is provided inside the power module, each feedback channel includes: a sample holder, wherein the input end of the sample holder is connected to the output end of the temperature sensing device of a power module, and the output end of the sample holder is connected to the temperature sampling signal end of the controller; the sample holder is integrated inside the power module; the sample holder is used to maintain the temperature of the connected power module; the triggering of the temperature sampling signal of the power module is synchronized with the rising edge of the pulse width modulation signal, and the frequency of the temperature sampling signal of the power module is equal to the switching frequency of the multi-phase switching power supply; when the sample holder receives the temperature sampling signal, the sample holder feeds back the temperature of the connected power module to the controller.

[0009] The present invention integrates the sample holders into the power module to ensure that the circuit or topology of the improved switching power supply is consistent with the traditional switching power supply.

[0010] In an optional embodiment, when a temperature sensing device is not provided inside the power module, each feedback channel includes: a sample holder and a temperature sensor, wherein the input end of the sample holder is connected to the output end of the temperature sensor, and the output end of the sample holder is connected to the temperature sampling signal end of the controller; the sample holder and the temperature sensor are integrated inside the power module; the temperature sensor is used to sense the temperature of the power module in real time; the sample holder is used to maintain the temperature sensed by the connected temperature sensor; the triggering of the temperature sampling signal of the power module is synchronized with the rising edge of the pulse width modulation signal, and the frequency of the temperature sampling signal of the power module is equal to the switching frequency of the multi-phase switching power supply; when the sample holder receives the temperature sampling signal, the sample holder feeds back the temperature sensed by the connected temperature sensor to the controller.

[0011] The present invention integrates both the temperature sensor and the sample holder into the power module to ensure that the circuit or topology of the improved switching power supply is consistent with the traditional switching power supply.

[0012] In an optional implementation, the controller compares the acquired temperature of the power module with a preset temperature threshold, and determines whether the temperature of the power module is abnormal.

[0013] In an optional embodiment, the temperature detection device of the multi-phase switching power supply also includes: an alarm or multiple alarms, wherein, when one alarm is included, the alarm is connected to a controller; when the temperature of the power module is abnormal, the controller controls the alarm to sound an alarm in an alarm mode corresponding to the abnormal power module; or, when multiple alarms are included, each alarm is connected to the controller; when the temperature of the power module is abnormal, the controller controls the alarm corresponding to the abnormal power module to sound an alarm.

[0014] In an optional embodiment, the temperature detection device of the multi-phase switching power supply also includes: a key input module, wherein the key input module is connected to the controller; the user controls the pulse width modulation signal, the temperature sampling signal, the preset temperature threshold of the power module, or queries the temperature of the power module through the key input module.

[0015] In a second aspect, the present invention provides a multi-phase switching power supply, comprising: multiple power modules and a temperature detection device of the multi-phase switching power supply of the first aspect and some optional embodiments thereof, wherein a controller is connected to the multiple power modules, and the controller is connected to the multiple power modules through a sampling and holding module; the controller sends corresponding pulse width modulation signals to the corresponding power modules, and the controller sends temperature sampling signals of the multiple power modules to the sampling and holding module; the pulse width modulation signal is used to control the on or off of the power module; the pulse width modulation signals of the multiple power modules are synchronized with their temperature sampling signals; the sampling and holding module is used to maintain the temperature of the multiple power modules; when the sampling and holding module receives the temperature sampling signal of a certain power module, the sampling and holding module feeds back the temperature of the power module to the controller.

[0016] In an optional implementation, the controller controls a pulse width modulation signal of the power module according to the acquired temperature of the power module to control the current of the power module.

[0017] Since the controller of the present invention can accurately and quickly obtain the temperature information of each power module, the temperature information can be added to the control loop of the switching power supply to ensure that the current and temperature of each power module are in a relatively balanced state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a structural diagram of a multi-phase switching power supply of related technology;

[0020] Figure 2 is a composition diagram of a temperature detection device for a multi-phase switching power supply according to an embodiment of the present invention;

[0021] Figure 3 is a composition diagram of another temperature detection device of a multi-phase switching power supply according to an embodiment of the present invention;

[0022] Figure 4 is a composition diagram of another temperature detection device of a multi-phase switching power supply according to an embodiment of the present invention;

[0023] Figure 5 is a composition diagram of another temperature detection device of a multi-phase switching power supply according to an embodiment of the present invention;

[0024] Figure 6 is a structural diagram of a multi-phase switching power supply according to an embodiment of the present invention;

[0025] Figure 7 is a timing diagram of temperature sampling in an embodiment of the present invention;

[0026] Figure 8 is a composition diagram of another temperature detection device of a multi-phase switching power supply according to an embodiment of the present invention;

[0027] Fig. 9 4 is a composition diagram of a temperature detection device of a multi-phase switching power supply according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The basic topology of traditional multi-phase switching power supply is as follows: Figure 1 As shown in the figure, the topology includes a voltage regulator controller (i.e., VR controller) and four DrMos (i.e., PowerStage) modules. The VR controller is connected to each PowerStage module through three signal lines, namely, PWM signal (i.e., Pulse Width Modulation, PWM signal), IMON (current monitoring signal), and TMON (temperature monitoring signal). The PWM signal and IMON signal of each PowerStage module are independently connected to the corresponding PWM and IMON pins of the VR controller. The TMON signal of each PowerStage module is hardware-connected together and connected to a TMON pin of the VR controller. Since the TMON signals of all PowerStage modules are connected together, the VR controller can only read the maximum temperature and cannot obtain the independent temperature information of each PowerStage module.

[0033] In order to solve the above problems, a temperature detection device for a multi-phase switching power supply is provided in this embodiment. Figure 2 As shown, it includes: a controller, a sampling and holding module, Figure 2 Three power modules are taken as an example.

[0034] like Figure 2 As shown, the controller is connected to multiple power modules of a multi-phase switching power supply, and the controller is connected to the multiple power modules through a sampling and holding module. The controller sends the corresponding PWM signal to the corresponding power module, and the controller sends the temperature sampling signals of the multiple power modules to the sampling and holding module, wherein the PWM signals of the multiple power modules are synchronized with their temperature sampling signals; the sampling and holding module is used to maintain the temperature of the multiple power modules; when the sampling and holding module receives the temperature sampling signal of a certain power module, the sampling and holding module feeds back the temperature of the power module to the controller.

[0035] Specifically, the controller can be a DSP chip, an MCU chip, etc., which is not limited here. The connection between the controller and the power can be divided into the following two ways:

[0036] (1) The controller is directly connected to the power module.

[0037] Exemplarily, the multi-phase switching power supply is described by taking a multi-phase flyback power supply as an example. The flyback power supply includes multiple power modules, each of which is composed of a drive circuit and a power electronic switch device, wherein the drive circuit is directly connected to the controller, and the drive circuit is connected to the control end of the power electronic switch device. The controller sends a PWM signal to the drive circuit, and the drive circuit converts the PWM signal into a drive voltage to drive the power electronic switch device to turn on or off.

[0038] (2) The controller is connected to the power module through a sample and hold module.

[0039] Exemplarily, the multi-phase switching power supply is explained by taking a multi-phase flyback power supply as an example. The flyback power supply includes multiple power modules, each of which is connected to a sampling and holding module. Each sampling and holding module obtains and maintains the temperature of each power module. The controller obtains the temperature of the corresponding power module by sending a temperature sampling signal to the sampling and holding module. For example: when it is necessary to obtain the temperature of the first power module, the first temperature sampling signal needs to be sent to the sampling and holding module, and the sampling and holding module feeds back the obtained and maintained temperature of the first power module to the controller.

[0040] In order to obtain the temperature of each power module instead of the maximum temperature, the power modules in the multi-phase switching power supply are not turned on or off at the same time, but operate at staggered times. Therefore, the temperature sampling signal of each power module can be synchronized with its PWM signal, that is, only the temperature of one power module can be fed back to the controller at any time. For example, when the PWM signal of the first power module is a rising edge, the temperature sampling signal is at a high level, so that the sampling and holding module feeds back the acquired and held temperature of the first power module to the controller.

[0041] In some optional embodiments, the controller includes multiple PWM signal terminals and a temperature sampling signal terminal; each PWM signal terminal is connected to the control terminal of a power module of a multi-phase switching power supply; the controller sends the corresponding PWM signal to the corresponding power module through the corresponding PWM signal terminal; the controller sends the temperature sampling signal of the corresponding power module to the sampling and holding module through the temperature sampling signal terminal.

[0042] Specifically, the controller has multiple PWM signal terminals, i.e., PWM signal pins, each PWM signal terminal is connected to a power module, and each PWM signal terminal is used to transmit the PWM signal to the power module; the controller has a temperature sampling signal terminal, and since the PWM signal of each power module is synchronized with its temperature sampling signal, at any time, the temperature sampling signal terminal only sends one temperature sampling signal to the sampling and holding module.

[0043] In some optional embodiments, such as Figure 3 As shown, the sampling and holding module has multiple built-in feedback channels; the input end of each feedback channel is connected to a power module, and the output end of each feedback channel is connected to the temperature sampling signal end of the controller; each feedback channel is used to maintain the temperature sensed by the connected temperature sensing module; when the sampling and holding module receives the temperature sampling signal, the sampling and holding module feeds back the temperature maintained by the corresponding feedback channel to the controller.

[0044] Specifically, since the PWM signal of each power module is synchronized with its temperature sampling signal, at any one moment, only one feedback channel is in the on state, that is, only one temperature sampling signal is sent to the sampling and holding module, that is, when the feedback channel receives the temperature sampling signal, the feedback channel feeds back the temperature of the power module to the controller, and when the feedback channel does not receive the temperature sampling signal, the feedback channel maintains the temperature of the power module.

[0045] In some optional embodiments, such as Figure 4 As shown, when a temperature sensing device is provided inside the power module, each feedback channel includes: a sample holder, wherein the input end of the sample holder is connected to the output end of the temperature sensing device of a power module, and the output end of the sample holder is connected to the temperature sampling signal end of the controller.

[0046] Specifically, most of the current DrMos basically integrate current sensing modules and temperature sensing modules. For power modules with internal temperature sensing devices, only a sample holder needs to be set in the feedback path, and the sample holder can be integrated inside the power module, so that the circuit or topology of the improved switching power supply can be kept consistent with the traditional one.

[0047] Specifically, when the sample holder does not receive a temperature sampling signal, the sample holder maintains the temperature of the connected power module; when the sample holder receives a temperature sampling signal, the sample holder feeds back the temperature of the connected power module to the controller.

[0048] Optionally, the sample-and-hold device samples and triggers the PWM signal of each PowerStage to synchronize, for example, the triggering of the temperature sampling signal of the power module is synchronized with the rising edge of the PWM signal, and the frequency of the temperature sampling signal of the power module is equal to the switching frequency of the multi-phase switching power supply.

[0049] In some optional embodiments, such as Figure 5 As shown, when no temperature sensing device is provided inside the power module, each feedback channel includes: a sample holder and a temperature sensor, wherein the input end of the sample holder is connected to the output end of the temperature sensor, and the output end of the sample holder is connected to the temperature sampling signal end of the controller.

[0050] Specifically, for a power module that does not have an internal temperature sensing device, a sample holder and a temperature sensor can be set on each feedback channel. The temperature sensor senses the temperature of the power module in real time. The temperature sensor can be a thermal resistor, a temperature sensor, etc., which is not limited here.

[0051] Optionally, the sample-and-hold device and the temperature sensor are integrated into the power module to ensure that the circuit or topology of the improved switching power supply remains consistent with the traditional one.

[0052] Specifically, when the sample holder does not receive a temperature sampling signal, the sample holder maintains the temperature sensed by the connected temperature sensor; when the sample holder receives a temperature sampling signal, the sample holder feeds back the temperature sensed by the connected temperature sensor to the controller.

[0053] Optionally, the sample-and-hold device samples and triggers the PWM signal of each PowerStage to synchronize, for example, the triggering of the temperature sampling signal of the power module is synchronized with the rising edge of the PWM signal, and the frequency of the temperature sampling signal of the power module is equal to the switching frequency of the multi-phase switching power supply.

[0054] For example, Figure 6 As shown, the temperature detection device of the multi-phase switching power supply of this embodiment adds a sample holder of the temperature sensing module on the basis of the traditional structure. The sample holder has the following characteristics:

[0055] (1) VR controller T mon The PIN is directly connected to the sample holder of each PowerStage temperature sensing module.

[0056] (2) The sample-and-hold device triggers the synchronization of the PWM signal of each PowerStage, which means that the VR controller will collect temperature information only at the rising edge of the PWM signal.

[0057] Based on the above, we get Figure 7 The timing diagram of temperature sampling is shown in Figure 7 It is shown that each temperature sampling (Temp0Sample) is synchronized with the PWM signal. Since the PWM signal of the multi-phase switching power supply is generated alternately for each PowerStage, the VR controller can use this staggered method to achieve temperature sampling for each PowerStage; and the frequency of temperature sampling for each PowerStage is equal to the switching frequency of the switching power supply.

[0058] In some optional implementations, the controller compares the acquired temperature of the power module with a preset temperature threshold, and determines whether the temperature of the power module is abnormal.

[0059] Specifically, in the control strategy of the switching power supply, the temperature information can be added to the control loop to ensure that the current and temperature of each PowerStage are in a relatively balanced state. This avoids the situation where the traditional mode has current sharing but inconsistent temperature. For example, when the temperature of the power module is too high, the controller changes the duty cycle of the power module to reduce the current of the power module, ultimately achieving the purpose of reducing the temperature of the power module.

[0060] In some optional implementations, the temperature detection device of the multi-phase switching power supply further includes: an alarm or multiple alarms.

[0061] Figure 8 When an alarm is included, the alarm is connected to the controller; when the temperature of the power module is abnormal, the controller controls the alarm to issue an alarm in an alarm mode corresponding to the abnormal power module. For example, when the temperature of the first power module is abnormal, the controller controls the alarm to issue a first alarm, and when the temperature of the second power module is abnormal, the controller controls the alarm to issue a second alarm, wherein the first alarm may be a blue light alarm, and the second alarm may be a red light alarm, or the first alarm and the second alarm have different frequencies.

[0062] or, Fig. 9In the embodiment, when multiple alarms are included, each alarm is connected to the controller; when the temperature of a power module is abnormal, the controller controls the alarm corresponding to the abnormal power module to sound an alarm. For example, when the temperature of the first power module is abnormal, the controller controls the first alarm corresponding to the first power module to sound a first alarm, and when the temperature of the second power module is abnormal, the controller controls the alarm corresponding to the second power module to sound a second alarm, wherein the first alarm may be a blue light alarm, and the second alarm may be a red light alarm, or the first alarm and the second alarm have different frequencies, or the first alarm and the second alarm are the same color of light, or the first alarm and the second alarm are the same frequency of sound.

[0063] In some optional embodiments, the temperature detection device of the multi-phase switching power supply also includes: a key input module, wherein the key input module is connected to the controller; the user controls the PWM signal, temperature sampling signal, preset temperature threshold of the power module, or queries the temperature of the power module through the key input module.

[0064] In order to adapt to various switching power supplies and various types of power modules, the user can set the PWM signal of the power module through the key input module to obtain the required power supply voltage; or set the preset temperature threshold under normal conditions in the actual working conditions of the power module through the key input module; or search for the power module temperature information saved on the controller through the key input module.

[0065] In addition, the controller can also be provided with a wireless communication module to perform remote communication and remote control with the terminal.

[0066] In this embodiment, a multi-phase switching power supply is provided, including: a plurality of power modules and a temperature detection device of a multi-phase switching power supply in the above embodiments and some optional implementation modes, wherein:

[0067] The controller is connected to each power module, and the controller is connected to multiple power modules through a sampling and holding module; the controller sends a corresponding PWM signal to the corresponding power module, and the controller sends temperature sampling signals of multiple power modules to the sampling and holding module; the PWM signal is used to control the on or off of the power module; the PWM signals of multiple power modules are synchronized with their temperature sampling signals; the sampling and holding module is used to maintain the temperature of multiple power modules.

[0068] When the sampling and holding module receives a temperature sampling signal of a certain power module, the sampling and holding module feeds back the temperature of the power module to the controller.

[0069] Specifically, the multi-phase switching power supply can be composed of a multi-phase DC-DC circuit, wherein the structure of the DC-DC circuit is not limited here. The structure and temperature detection principle of the temperature detection device of the multi-phase switching power supply have been described in detail in the above embodiments and will not be repeated here.

[0070] In some optional implementations, the controller controls the PWM signal of the power module according to the acquired temperature of the power module to control the current of the power module.

[0071] Specifically, in the control strategy of the switching power supply, the temperature information can be added to the control loop to ensure that the current and temperature of each PowerStage are in a relatively balanced state. This avoids the situation where the traditional mode has current sharing but inconsistent temperature. For example, when the temperature of the power module is too high, the controller changes the duty cycle of the power module to reduce the current of the power module, ultimately achieving the purpose of reducing the temperature of the power module.

[0072] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A temperature detection device for a multi-phase switching power supply, characterized in that: include: Controller, sample and hold module, where: The controller is connected to a plurality of power modules of the multi-phase switching power supply, and the controller is connected to the plurality of power modules through the sampling and holding module; The controller sends corresponding pulse width modulation signals to corresponding power modules, and the controller sends temperature sampling signals of multiple power modules to the sampling and holding module, wherein the pulse width modulation signals of multiple power modules are synchronized with their temperature sampling signals; The sampling and holding module is used to maintain the temperatures of multiple power modules; When the sampling and holding module receives a temperature sampling signal of a certain power module, the sampling and holding module feeds back the temperature of the power module to the controller.

2. The temperature detection device of the multi-phase switching power supply according to claim 1, characterized in that: The controller includes a plurality of pulse width modulation signal terminals and a temperature sampling signal terminal; Each pulse width modulation signal terminal is connected to a control terminal of a power module of the multi-phase switching power supply; The controller sends a corresponding pulse width modulation signal to a corresponding power module through the corresponding pulse width modulation signal terminal; The controller sends a temperature sampling signal of a corresponding power module to the sampling and holding module through the temperature sampling signal terminal.

3. The temperature detection device of the multi-phase switching power supply according to claim 2, characterized in that: The sample-and-hold module has multiple built-in feedback channels; The input end of each feedback channel is connected to a power module, and the output end of each feedback channel is connected to the temperature sampling signal end of the controller; Each feedback channel is used to maintain the temperature sensed by the connected temperature sensing module; When the sampling and holding module receives the temperature sampling signal, the sampling and holding module feeds back the temperature held by the corresponding feedback channel to the controller.

4. The temperature detection device of the multi-phase switching power supply according to claim 3, characterized in that: When a temperature sensing device is provided inside the power module, Each feedback channel includes: a sample-and-hold circuit, where The input end of the sample holder is connected to the output end of a temperature sensing device of a power module, and the output end of the sample holder is connected to the temperature sampling signal end of the controller; The sample and hold device is integrated inside the power module; The sample holder is used to maintain the temperature of the connected power module; The triggering of the temperature sampling signal of the power module is synchronized with the rising edge of the pulse width modulation signal, and the frequency of the temperature sampling signal of the power module is equal to the switching frequency of the multi-phase switching power supply; When the sample holder receives the temperature sampling signal, the sample holder feeds back the temperature of the connected power module to the controller.

5. The temperature detection device of the multi-phase switching power supply according to claim 3, characterized in that: When the power module is not provided with a temperature sensing device, Each feedback channel includes: a sample and hold device and a temperature sensor, where: The input end of the sample holder is connected to the output end of the temperature sensor, and the output end of the sample holder is connected to the temperature sampling signal end of the controller; The sample holder and the temperature sensor are integrated inside the power module; The temperature sensor is used to sense the temperature of the power module in real time; The sample holder is used to hold the temperature sensed by the connected temperature sensor; The triggering of the temperature sampling signal of the power module is synchronized with the rising edge of the pulse width modulation signal, and the frequency of the temperature sampling signal of the power module is equal to the switching frequency of the multi-phase switching power supply; When the sample holder receives the temperature sampling signal, the sample holder feeds back the temperature sensed by the connected temperature sensor to the controller.

6. The temperature detection device of the multi-phase switching power supply according to claim 1, characterized in that: The controller compares the acquired temperature of the power module with a preset temperature threshold, and determines whether the temperature of the power module is abnormal.

7. The temperature detection device of the multi-phase switching power supply according to claim 6, characterized in that: Also includes: An alarm or multiple alarms, where: When an alarm is included, the alarm is connected to the controller; when the temperature of the power module is abnormal, the controller controls the alarm to sound an alarm in an alarm mode corresponding to the abnormal power module; Alternatively, when a plurality of alarms are included, each of the alarms is connected to the controller; when the temperature of the power module is abnormal, the controller controls the alarm corresponding to the abnormal power module to sound an alarm.

8. The temperature detection device of the multi-phase switching power supply according to claim 1, characterized in that: Also includes: Key input module, where The key input module is connected to the controller; The user controls the pulse width modulation signal, the temperature sampling signal, the preset temperature threshold of the power module, or inquires the temperature of the power module through the key input module.

9. A multi-phase switching power supply, characterized in that: include: A temperature detection device for a multi-phase switching power supply according to any one of claims 4 to 8 and a plurality of power modules, wherein: The controller is connected to the plurality of power modules, and the controller is connected to the plurality of power modules via a sampling and holding module; The controller sends corresponding pulse width modulation signals to corresponding power modules, and the controller sends temperature sampling signals of multiple power modules to the sampling and holding module; The pulse width modulation signal is used to control the on or off of the power module; The pulse width modulation signals of multiple power modules are synchronized with their temperature sampling signals; The sampling and holding module is used to maintain the temperatures of multiple power modules; When the sampling and holding module receives a temperature sampling signal of a certain power module, the sampling and holding module feeds back the temperature of the power module to the controller.

10. The multi-phase switching power supply according to claim 9, characterized in that: The controller controls the pulse width modulation signal of the power module according to the acquired temperature of the power module to control the current size of the power module.

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