TW201931755A - Power supply having adjustable power output limitation and method for adjusting power output limitation - Google Patents

Abstract

A method for adjusting allowable power output of a power supply comprises: receiving an AC current from an input of the power supply, transforming the AC current into a target DC current, outputting the target DC current via a output of the power supply; detecting a current status between the input and the output; and according to an initial current limit, cut off connection between the input and the output when the current status reaches the initial current limit, or raising the initial current limit to an adjusted current limit.

Description

Power supply with adjustable power consumption limit and method for adjusting power consumption limitation

The present invention relates to power supplies, and more particularly to power supplies that can adjust power consumption limits and methods of adjusting power consumption limits.

The power supply usually has a high safety factor, which is the maximum stable power consumption that the power supply can actually reach, which is higher than the allowable power consumption (maximum total power output) indicated in the specification. However, excessive power consumption also reduces conversion efficiency. In order to make the power supply meet the energy conversion efficiency rating specification (according to the 80plus energy-saving standard, the power conversion efficiency of the commercially available power supply can be divided into white, bronze, silver, gold, platinum, etc.), the power supply will It is set by the upper limit flow, and the conversion efficiency when the output power is high is not inconsistent with various grade specifications.

However, for some users, there may be a need to increase power consumption, for example, the number of external peripherals of the computer mainframe increases, or the system cooling requirements are limited by the current limiting design of the power supply because the climate needs to be strengthened. Therefore, the user must replace the product that allows higher power consumption. Even if the user is only a short-time high power demand, the problem of poor energy conversion efficiency can be temporarily ignored.

In view of the above problems, the present invention provides a power supply capable of adjusting power consumption limitation and a method for adjusting power consumption limitation, which allows the user to temporarily increase the power consumption limit of the power supply, and maintain good energy under normal use. Conversion efficiency rating.

The invention provides a power supply capable of adjusting power consumption limitation, comprising a power conversion circuit, a current detecting component, a current limiting switch and a control unit. The power conversion circuit is configured to receive an AC power input from an input terminal and convert it into a target voltage output current, and an output terminal outputs a target voltage output current. The current detecting component is disposed between the input end and the output end to detect a current state. The current limiting switch is disposed between the input end and the output end to cut off the circuit between the input end and the output end. The control unit is configured to control the switching of the current limiting switch, and the control unit has at least one initial current limiting value, and receives the current state fed back by the current detecting component, and the working mode of the control unit includes a current limiting mode and a lifting mode.

In the current limiting mode, the control unit controls the current limiting switch to cut off the circuit between the input terminal and the output terminal when the current state fed back by the current detecting component reaches the initial current limiting value.

In the boost mode, the control unit increases the initial current limit value to an adjusted current limit value when the current state fed back by the current detecting component reaches the initial current limit value.

The present invention also provides a method for adjusting power consumption limitation, which is used in a power supply device according to any of the embodiments of the present invention, the method comprising: receiving an AC power input from an input terminal, and converting the input to a target voltage output current, and Outputting a target voltage output current from the output terminal; detecting a current state between the input terminal and the output terminal; and, according to an initial current limit value, cutting off the input terminal to the output terminal when the current state reaches the initial current limit value The circuit, or when the current state reaches the initial current limit value, raises the initial current limit value to an adjusted current limit value.

Through the above technical means, the present invention can limit the total output power of the power supply according to the initial current limit value, and meet the safety regulations and energy efficiency requirements. When the total output power needs to be increased, the user can increase the total output power limit of the power supply by the activation mode of the boost mode to meet the output power requirement. Therefore, the power supply that can adjust the power consumption limit can meet different user requirements, or the same user needs in different use environments.

Referring to FIG. 1 , a power supply 100 capable of adjusting power consumption limitation according to an embodiment of the present invention includes a power conversion circuit, one or more cooling fans 150 , a current detecting component 160 , and a limit The flow switch 170 and a control unit 180.

As shown in FIG. 1, the power conversion circuit is configured to receive an AC power input AC from an input terminal 102, and convert it into at least one target voltage output current (3.3V, 5V, 12V) and a fan drive power FV, and Or a plurality of output terminals 104 output a target voltage output current (3.3V, 5V, 12V).

The cooling fan 150 receives the fan driving power FV and rotates to perform forced air cooling of the power supply 100. The operation of the power supply 100 generates high heat and is usually installed in a computer case, so forced air cooling is required for cooling. And the power supply 100 needs to adjust the energy consumption of the forced air cooling for the heat generation state, so as to avoid the excessive forced air cooling energy consumption affecting the overall energy efficiency and generating unnecessary noise. The rotation speed of the heat dissipation fan 150 can be adjusted by adjusting the current magnitude or voltage of the fan drive power FV.

As shown in FIG. 1 , in one embodiment, the power conversion circuit includes a rectifier circuit 110 , a main transformer circuit 120 , a plurality of secondary transformer circuits 130 , and a fan transformer circuit 140 .

As shown in FIG. 1, the rectifier circuit 110 is configured to receive the AC power input AC from the input terminal 102 and convert it into a high voltage DC current DC1. In a specific embodiment, the rectifier circuit 110 can be a full-wave rectifier circuit 110, such as a bridge rectifier circuit 110; the rectifier circuit 110 can also be a half-wave rectifier circuit 110, for example, a single diode is electrically connected to the input in the forward direction. End 102, but half-wave rectification circuit 110 typically has half of the input becoming reactive power.

As shown in FIG. 1, the main transformer circuit 120 has a primary side coil 122 and a secondary side coil 124. The primary side coil 122 is electrically connected to the rectifier circuit 110 to receive the high voltage direct current DC1. Through the induction of the secondary side coil 124 and the primary side coil 122, the main transformer circuit 120 converts the high voltage direct current DC1 to a low voltage direct current DC2, and the secondary side coil 124 outputs a low voltage direct current DC2. The main transformer circuit 120 can also be other forms of DC-to-DC converters as long as the operating power and conversion efficiency meet the specifications.

As shown in FIG. 1, the plurality of secondary transformer circuits 130 are electrically connected to the secondary side coils 124 of the main transformer circuit 120, respectively, and convert the low-voltage DC current DC2 into a target voltage output current (3.3V, 5V, 12V). To adjust the low voltage DC current DC2 to the output of different output terminals 104 (3.3V, 5V, 12V). The sub-transformer circuit 130 typically requires only a small current output, so a non-coil type DC-DC converter can be applied, such as a converter consisting of an integrated circuit component (IC) plus several parts. Taking the power supply 100 of the computer as an example, the output terminal 104 needs at least 3.3V, 5V and 12V and other target voltages for the power required by the peripheral devices and the components of the motherboard itself. These different voltages have different electrical connectors as the output terminals 104, and each of the target voltages may have more than two electrical connectors.

As shown in FIG. 1, the fan transformer circuit 140 is electrically connected to the secondary side coil 124 of the main transformer circuit 120 to receive the low voltage DC current DC2, or the fan transformer circuit 140 may be electrically connected to the rectifier circuit 110 for receiving. The high voltage direct current DC1 causes the fan transformer circuit 140 to convert the high voltage direct current DC1 or the low voltage direct current DC2 into the fan drive power FV. The cooling fan 150 is electrically connected to the fan transforming circuit 140 to receive the fan driving power FV for rotation. In an embodiment in which the fan transforming circuit 140 receives the low-voltage direct current DC2 and converts it into the fan driving power FV, the fan transforming circuit 140 is one of the plurality of secondary transformer circuits 130, and the output fan driving power FV is the target. The voltage or target voltage output current (3.3V, 5V, 12V), and the target voltage or output current given to the cooling fan 150 is adjusted in accordance with the rotational speed requirement of the cooling fan 150. In order to make the description of the embodiments clearer and easier to understand, different names are given.

As shown in FIG. 1, the current detecting component 160 is disposed between the input terminal 102 and the output terminal 104 to detect a current state. The current state is mainly used to determine the output power of the power supply 100. The larger the current value, the larger the output power, and the set position of the current detecting component 160 causes the corresponding relationship between the output power and the current value to change. However, the correspondence between the output power and the current value can be evaluated according to the position of the current detecting component 160. Generally, the current value and the corresponding power obtained by the current detecting component 160 near the output terminal 104 are closer to the power supply 100. The total output power, and the current value and corresponding power obtained by the current detecting component 160 close to the input terminal 102 is higher than the total output power of the power supply 100 (because there is a relationship between the input terminal 102 and the output terminal 104). Power loss). Regardless of the position of the current detecting element 160, a person having ordinary knowledge can calculate the correspondence between the current state and the total output power of the power supply 100 through an experiment or a simple equivalent circuit, and obtain a conversion formula or a comparison table.

As shown in FIG. 1, a current limiting switch 170 is disposed between the input terminal 102 and the output terminal 104 for cutting off the circuit between the input terminal 102 and the output terminal 104. The control unit 180 stores at least one initial current limit value, and the control unit 180 is configured to receive the current state fed back by the current detecting component 160. The operating mode of the control unit 180 has at least one current limiting mode and one boosting mode.

In the current limiting mode, the power supply 100 is required to have a relatively high energy conversion efficiency, so it is necessary to avoid a situation in which the total output power is too high and the conversion efficiency is lowered. The control unit 180 sets the voltage or current magnitude of the fan driving power FV according to the initial current limiting value to drive the cooling fan 150 to rotate. The set fan driving power FV can make the speed of the cooling fan 150 meet the heat dissipation requirement of the power supply 100, but does not exceed the heat dissipation requirement of the power supply 100.

In the current limiting mode, the control unit 180 continuously receives the current state fed back by the current detecting component 160 to monitor the total output power of the power supply 100. When the current state fed back by the current detecting component 160 reaches the initial current limiting value, it means that the total output power of the power supply 100 has reached the upper limit of the total output power. At this time, the control unit 180 controls the current limiting switch 170 to temporarily cut off the circuit between the input terminal 102 and the output terminal 104. The control unit 180 may cut off the output of all of the output terminals 104, or may only cut off the output of the partial output terminals 104, so that the total output power of the power supply 100 does not exceed the total output power corresponding to the initial current limit value.

In the boost mode, the user allows the power supply 100 to have a lower conversion efficiency (accepting a lower energy saving standard level) in exchange for a larger total output power. The control unit 180 initially sets the fan drive power FV in accordance with the initial current limit value. When the current state fed back by the current detecting component 160 of the control unit 180 reaches the initial current limiting value, the control unit 180 raises the initial current limiting value to an adjusted current limiting value. At this time, the initial current limit value is temporarily disabled, and the output of the power supply 100 is limited by adjusting the current limit value, where the adjusted current limit value is greater than the initial current limit value, and the total output power of the power supply 100 is The upper limit can be increased.

When the current state fed back by the current detecting component 160 reaches the adjusted current limit value, the total output power of the power supply 100 has reached the adjusted total output power upper limit, and the control unit 180 controls the current limiting switch 170 to cut off the input terminal 102. The circuit between the output terminals 104 allows the power supply 100 at this time to have a large power consumption. At the same time, when the current state exceeds the initial current limit value and the adjusted current limit value has not been reached, the rotation speed of the heat dissipation fan 150 may not be sufficient to meet the heat dissipation requirement of the power supply device 100, so the control unit 180 simultaneously resets the fan according to the adjusted current limit value. The electric power FV is driven to increase the rotational speed of the cooling fan 150. The rotation speed of the heat dissipation fan 150 corresponding to the adjustment of the current limit value can be obtained by an experiment in advance and recorded in a form correspondence relationship, and stored by the control unit 180. The control unit 180 can store a plurality of adjusted current limit values for the user to select one of them, that is, the power supply 100 can have multiple total output power upper limits, and select one according to the user's needs, and The operation mode of the switching control unit 180 is the boost mode.

Referring to FIG. 1 , the power supply 100 further includes a temperature detecting component 152 for detecting the temperature of one week and transmitting to the control unit 180, and the control unit 180 stores a plurality of cooling fan speed values, corresponding to multiple A different ambient temperature range. The initial current limiting value and the adjusted current limiting value are respectively in a plurality of different circumferential temperature intervals, and have corresponding cooling fan rotational speed values. Therefore, when the control unit 180 sets the rotational speed of the cooling fan 150 according to the initial current limiting value or the adjusted current limiting value, the surrounding temperature range where the ambient temperature is located is first determined, and then the corresponding cooling fan rotational speed value is obtained, thereby adjusting the cooling fan 150. Rotating speed. Therefore, when the ambient temperature is lowered and the control unit 180 performs the current limiting setting according to the adjusted current limit value, the rotation speed of the heat dissipation fan 150 may still decrease or stop rotating.

Referring to FIG. 2, a method for adjusting power consumption limitation according to an embodiment of the present invention is provided for a power supply 100 of one or more embodiments of the present invention. The method of adjusting the power consumption limitation is described below.

First, the power supply 100 receives an AC power input AC from an input terminal 102 and converts it into at least one target voltage output current (3.3V, 5V, 12V) and a fan drive power FV, as shown in step S110.

The power supply 100 outputs a target voltage output current (3.3V, 5V, 12V) at an output terminal 104, and drives a heat dissipation fan 150 to rotate by the fan drive power FV, as shown in step S120.

In step S110, voltage and current conversion are usually performed twice. After receiving the AC power input AC, the power supply 100 first converts the AC power input AC into a high voltage DC current DC1 by the rectifier circuit 110; then, the power supply 100 converts the high voltage DC current DC1 into the main transformer circuit 120. A low voltage DC current DC2. Finally, the secondary transformer circuit 130 and the fan transformer circuit 140 are electrically connected to the main transformer circuit 120, respectively, and convert the low-voltage DC current DC2 into a target voltage output current (3.3V, 5V, 12V) and the fan drive power FV. In some embodiments, the fan transformer circuit 140 can also convert the high voltage direct current DC1 to the fan drive power FV.

The power supply 100 detects a current state between the input terminal 102 and the output terminal 104 by the current detecting component 160, and transmits the current value to the control unit 180 of the power supply 100, as shown in step S130.

Based on an initial current limit value, the control unit 180 continues to determine whether the current state has reached the initial current limit value, as shown in step S140.

The control unit 180 also determines whether the boost mode of the power supply 100 is enabled, as shown in step S142.

If the boost mode is not enabled, and the current state reaches the initial current limit value, the control unit 180 cuts off the circuit between the input terminal 102 and the output terminal 104, thereby limiting the total output power of the power supply 100, as in step S150. Show.

If the boost mode is enabled and the current state reaches the initial current limit value, the control unit 180 boosts the initial current limit value to an adjusted current limit value, as shown in step S160. The control unit 180 simultaneously resets the voltage or current of the fan drive power FV according to the adjusted current limit value to increase the rotational speed of the heat dissipation fan 150, as shown in step S162.

After the boost mode is enabled, the control unit 180 will cut off the circuit between the input terminal 102 and the output terminal 104 when the current state reaches the adjusted current limit value, as shown in step S170 and step S150, thereby lifting the control unit 180. The total output.

As shown in FIG. 1 , the power supply 100 further includes a Power Factor Correction IC (PFC IC) disposed in the power conversion circuit for correcting the power factor to reduce the reactive power of the power conversion circuit.

As shown in FIG. 3 , in one embodiment, the current detecting component 160 includes a first resistor 162 and a second resistor 164 . One end of the first resistor 162 is connected to any point in the power conversion circuit for voltage sampling, and the other end is connected to the sampling terminal 182 of the control unit 180. One end of the second resistor 164 is grounded, and the other end is connected to the sampling end point 182 of the control unit 180. By passing the current through the one end of the first resistor 162, the first resistor 162 and the second resistor 164, the control unit 180 can obtain a sampling voltage, which is converted into the equivalent current of the power conversion circuit (ie, The total power output of the power supply 100). The sampling unit 180 that is triggered by the control unit 180 to determine the overcurrent or the current limit value may be fixed, but the control unit 180 may adjust the first resistor 162 and the second resistor 164 according to the initial current limit value and the adjusted current limit value. The resistance ratio increases or decreases the value of the corresponding overcurrent (current limit value) value (ie, changes from the initial current limit value to the adjusted current limit value).

As shown in FIG. 4, it is a circuit design method for adjusting the resistance ratio of the first resistor 162 and the second resistor 164 in FIG. The first resistor 162 can include a second sampling resistor 162a and a transistor switch 162b. The two sampling resistors 162a are connected in parallel, but one of the sampling resistors 162a is connected in series with the transistor switch 162b. The transistor switch 162b is controlled by the control unit 180. When the transistor switch 162b is not turned on, only a single sampling resistor 162a constitutes the first resistor 162, and has a large resistance value such that the sampling voltage of the sampling terminal 182 is relatively low. When the transistor switch 162b is turned on, the two sampling resistors 162a are formed in parallel to form the first resistor 162 with a lower resistance value such that the sampling voltage of the sampling terminal 182 is relatively high.

As shown in FIG. 5, it is a circuit design method for adjusting the resistance ratio of the first resistor 162 and the second resistor 164 in FIG. The second resistor 164 can include a second grounding resistor 164a and a transistor switch 164b. The two grounding resistors 164a are connected in parallel, but one of the grounding resistors 164a is connected in series with the transistor switch 164b. The transistor switch 164b is controlled by the control unit 180. When the transistor switch 164b is not turned on, only a single ground resistor 164a constitutes the second resistor 164, and has a large resistance value such that the sampling voltage of the sampling terminal 182 is relatively high. When the transistor switch 164b is turned on, the two sampling resistors 162a are formed in parallel to form the second resistor 164 with a lower resistance value such that the sampling voltage of the sampling terminal 182 is relatively low.

The resistance of one of the first resistor 162 and the second resistor 164 is designed to be adjustable, and the resistance ratio adjustment can be performed. That is, the circuit design of FIG. 4 or FIG. 5 can be selected to replace the first resistor in FIG. 162 or second resistor 164. The resistance values of the first resistor 162 and the second resistor 164 can also be designed to be adjustable. For example, the circuit design of FIGS. 4 and 5 can be used simultaneously to replace the first resistor 162 and the second resistor 164 in FIG. , so that there are more changes in the resistance ratio, which can be used to set multiple adjustment current limit values.

The rotation speed of the heat dissipation fan 150 can be changed by the control of the fan transformation circuit 140 by the control unit 180 to change the fan drive power FV. In an embodiment, the control unit 180 controls the fan transforming circuit 140 to directly increase or decrease the output voltage of the fan driving power FV, thereby changing the rotational speed of the cooling fan 150. In another embodiment, the fan driving power FV is a pulse width modulation signal (PWM), and the control unit 180 controls the fan transforming circuit 140 such that the pulse width of the fan driving power FV is changed, and the application to the cooling fan 150 is changed. The current is sized to adjust the speed of the cooling fan 150. The rotation speed of the cooling fan 150 may be a value that changes with temperature, that is, the control unit 180 can receive a temperature, and adjust the rotation speed of the heat dissipation fan 150 to a corresponding rotation speed according to the temperature in the same operation mode.

As shown in FIG. 6 and FIG. 7 , in an embodiment, the control unit 180 has a complete operation and control function, and receives power state for power consumption detection, and adjusts the initial current limit value/adjust current limit value and current state. The comparison is performed to automatically switch to change the current limit value or change the rotation speed of the heat dissipation fan 150. The power supply 100 may further include a switch 184 for manually setting the power consumption limit, that is, the user manually selects the initial current limit value/adjust the current limit value, and changes the current limit value and changes the speed of the heat dissipation fan 150. .

As shown in FIG. 8, in an embodiment, the control unit 180 further includes a communication interface 186 and a microcontroller 188. The communication interface 186 can be applied to protocols such as USB, COM Port, network protocol, and I2C bus. The microcontroller 188 has a signal receiving and transmitting function, and can receive the power state from the current detecting component 160, and transmit it to the outside through the communication interface 186, for example, with the circuit/board of the host computer, and the software host itself executes the software. The software control module is formed. After receiving the power state from the microcontroller 188, the software control module compares the initial current limit value/adjust current limit value with the current state, thereby controlling the current limit, increasing the current limit, or changing the speed of the heat dissipation fan 150. The instructions are transmitted to the microcontroller 188 via the communication interface 186, causing the microcontroller 188 to drive the current limit switch 170 and the fan transformer circuit 140 to perform operations to achieve automatic power consumption detection and adjustment. In addition, the adjustment current limit value may be multiple, and the user can manually select the required adjustment current limit value (corresponding to different total output power upper limit) through the operation interface provided by the software module, and perform manual setting.

In the foregoing embodiment, the heat dissipation fan 150 is integrated into the power supply 100, but in other embodiments, the heat dissipation fan 150 may also be independently disposed outside the power supply 100, and the two are electrically connected. Still alternatively, in other embodiments, the power supply 100 can be dissipated directly by way of system negative pressure.

Through the above technical means, the power supply 100 with adjustable power consumption of the present invention can limit the total output power of the power supply 100 according to the initial current limit value, and meet the safety specifications and energy efficiency requirements, so that the general user does not It can be used as a normal power supply 100 with special settings. When the total output power needs to be increased, the user can increase the total output power limit of the power supply 100 by the activation of the boost mode to meet the output power requirement. Therefore, the power supply 100 that can adjust the power consumption limit can meet different user requirements. For example, the conversion efficiency of the platinum grade (or the gold grade, the silver grade, etc.) can be converted into the conversion efficiency of the gold grade (or the silver grade, the bronze grade, etc.) by the power supply of the invention to satisfy the user to increase the power consumption. Waiting for the demand.

100‧‧‧Power supply

102‧‧‧ input

104‧‧‧ Output

110‧‧‧Rectifier circuit

120‧‧‧Main transformer circuit

122‧‧‧One-side coil

124‧‧‧second side coil

130‧‧‧ times transformer circuit

140‧‧‧Fan transformer transformer circuit

150‧‧‧ cooling fan

152‧‧‧ Temperature detecting element

160‧‧‧ Current detecting components

162‧‧‧First resistance

162a‧‧‧Sampling resistor

162b‧‧‧Transistor Switch

164‧‧‧second resistance

164a‧‧‧Ground resistor

164b‧‧‧Transistor Switch

170‧‧‧ Current limiting switch

180‧‧‧Control unit

182‧‧‧Sampling endpoint

184‧‧‧ switch

186‧‧‧Communication interface

188‧‧‧Microcontroller

190‧‧‧Power factor correction component

AC‧‧‧AC power input

FV‧‧‧Fan drive power

DC1‧‧‧High voltage DC current

DC2‧‧‧Low-voltage DC current

3.3V, 5V, 12V‧‧‧ target voltage output current

S110~S170‧‧‧Steps

1 is a circuit block diagram of a power supply device according to an embodiment of the present invention. 2 is a flow chart of a method in accordance with an embodiment of the present invention. 3 is a circuit diagram of a current detecting component in an embodiment of the present invention. 4 is a schematic diagram of another circuit of the current detecting component in the embodiment of the present invention. FIG. 5 is a schematic diagram of still another circuit of the current detecting component in the embodiment of the present invention. Figure 6 is a block diagram of another circuit of an embodiment of the present invention. FIG. 7 is a schematic diagram of an embodiment of a control unit in an embodiment of the present invention. FIG. 8 is a schematic diagram of another embodiment of a control unit in an embodiment of the present invention.

Claims (10)

A power supply capable of adjusting power consumption, comprising: a power conversion circuit for receiving an AC power input from an input and converting it to a target voltage output current, and outputting the target voltage output by an output terminal a current detecting component is disposed between the input end and the output end to detect a current state; a current limiting switch is disposed between the input end and the output end to cut off the input end a circuit between the output terminals; and a control unit configured to control switching of the current limiting switch, and the control unit has at least one initial current limit value, receiving a current state fed back by the current detecting component, and the current state The operating mode of the control unit includes a current limiting mode and a boosting mode; wherein, in the current limiting mode, the control unit controls the current limiting when the current state fed back by the current detecting component reaches the initial current limiting value The switch cuts off the circuit between the input terminal and the output terminal; and in the boost mode, the control unit reaches the initial current limit value when the current state fed back by the current detecting component reaches the initial current limit value. The initial lifting of a current limit adjust the current limit. The power supply of the adjustable power consumption limit of claim 1, wherein in the boost mode, the control unit controls the current limit when the current state fed back by the current detecting component reaches the adjusted current limit value The switch cuts off the circuit between the input and the output. The power supply device of claim 1, wherein the power conversion circuit comprises: a rectifier circuit for receiving the AC power input from the input terminal and converting the power to a high voltage DC current; The main transformer circuit is configured to convert the high voltage direct current into a low voltage direct current; and at least one transformer circuit converts the low voltage direct current into the target voltage output current, and outputs the output terminal. The power supply of the adjustable power consumption limit of claim 3, further comprising a cooling fan; wherein the power conversion circuit is further configured to convert the AC power input into a fan driving power, and the cooling fan is configured to receive The fan drives the electric power to rotate; wherein, in the lifting mode, the control unit resets the fan driving power according to the adjusted current limiting value to increase the rotation speed of the cooling fan; wherein the power conversion circuit further includes a fan transforming The circuit converts the high voltage direct current or the low voltage direct current into the fan drive power. The power supply of the adjustable power consumption limit of claim 4, wherein the control unit controls the fan transformer circuit to change a voltage or current of the fan driving power to change a rotation speed of the cooling fan; or The fan drive power is a pulse width modulation signal, and the control unit controls the fan transformer circuit to change a pulse width width of the fan drive power to change a current of the fan drive power. The power supply capable of adjusting the power consumption limit as claimed in claim 4, further comprising a temperature detecting component for detecting a temperature of one week, transmitting to the control unit, and storing, by the control unit, a plurality of cooling fan speeds The value corresponds to a plurality of different ambient temperature intervals; wherein the initial current limit value and the adjusted current limit value respectively have corresponding cooling fan speed values in the different surrounding temperature intervals; when the control unit is configured according to the When the initial current limit value or the adjusted current limit value is set to the cooling fan speed, the corresponding cooling fan speed value is obtained according to the surrounding temperature range where the ambient temperature is located, thereby adjusting the speed of the cooling fan. The power supply of the adjustable power consumption limit of claim 1, wherein the current detecting component comprises: at least: a first resistor, one end of which is connected to the power conversion circuit, and the other end of which is connected to the control unit a sampling end; and a second resistor having one end grounded and the other end connected to the sampling end of the control unit, such that the control unit obtains a sampling voltage as the current state, and the control unit is configured to The initial current limit value and the adjusted current limit value adjust a resistance ratio of the first resistor and the second resistor. The power supply of the adjustable power consumption limit of claim 7, wherein the first resistor comprises two sampling resistors and a transistor switch, the two sampling resistors are connected in parallel, and one of the two sampling resistors The crystal switch is connected in series, and the transistor switch is controlled by the control unit to be switched on or off; and/or the second resistor includes two grounding resistors and the transistor switch, the two grounding resistors are connected in parallel, and The transistor switch is controlled by the control unit and switched to be conductive or not. A method of adjusting a power consumption limit for a power supply, wherein the power supply is the power supply of any one of claim 1 to claim 8, the method comprising: receiving an input by an input AC power input, and converted into a target voltage output current, and outputting the target voltage output current by an output terminal; detecting a current state between the input terminal and the output terminal; and according to an initial current limit value, When the current state reaches the initial current limit value, the circuit between the input terminal and the output terminal is cut off, or when the current state reaches the initial current limit value, the initial current limit value is raised to an adjustment current limit. value. The method for adjusting power consumption limitation according to claim 9, further comprising: cutting off the circuit between the input end and the output end when the current state reaches the adjusted current limit value; wherein, determining that the current state arrives After the initial current limit value, the method further includes: determining whether a boost mode is enabled; and if the boost mode is not enabled, cutting off the circuit between the input terminal and the output terminal.