Power supply forced heat dissipation control circuit and power supply device with heat dissipation fan

Abstract

The utility model discloses a power supply forced heat dissipation control circuit and a power supply device with a heat dissipation fan. The power supply forced heat dissipation control circuit comprises a power supply output management circuit, a fan output interface, a first detection circuit setting position, a second detection circuit setting position, a feedback circuit and a boost control circuit, the first detection circuit setting position and the second detection circuit setting position are respectively connected to the feedback circuit; the first detection circuit setting position is provided with a temperature sensing circuit and / or the second detection circuit setting position is provided with a current sensing circuit; the boost control circuit is connected to the feedback circuit, the power output management circuit and the fan output interface, the boost control circuit carries out boost control according to the feedback circuit so as to provide a second output voltage for the fan output interface, and the second output voltage is larger than the first output voltage. Therefore, the temperature sensing circuit and / or the current sensing circuit are / is selected to be connected according to needs, so that voltage is boosted in real time according to the conditions of environment temperature, power overload and the like, the voltage of the fan is improved, and heat is dissipated powerfully.

Description

Technical Field

[0001] The utility model relates to the technology of power supply field, in particular to a power supply forced heat dissipation control circuit and a power supply device with a heat dissipation fan. Background Art

[0002] At present, it is necessary to set a cooling fan in the power supply device of computers and servers. Taking desktop computer power supplies as an example, the cooling fan of common desktop computer power supplies adopts a single fixed working voltage, such as DC12V. Therefore, the speed and heat dissipation capacity of its cooling fan are single and fixed. In actual use, sometimes the internal temperature of the power supply device is too high. If the cooling fan uses the original speed, it is difficult to dissipate heat quickly, which may easily cause the performance of the power supply device to be damaged due to long-term high temperature. Based on this situation, a technical solution for real-time adjustment of the speed of the cooling fan has emerged in the industry. It is provided with a speed adjustment circuit. The speed adjustment circuit monitors the heating condition of the power supply in real time through a thermistor, and adjusts the speed of the cooling fan according to the heating condition of the power supply.

[0003] Some users choose (or replace) computer power supplies by themselves, especially to meet the higher power / current requirements of other replaced accessories in the computer (such as graphics cards, etc.). Users will purchase high-power power supplies. For the original cooling fan in the computer, its heat dissipation capacity cannot meet the current high-power power demand, and the heat cannot be dissipated in time, resulting in problems such as slow computer operation, freezing or even freezing. As a result, users report to merchants and manufacturers that the defective / failure rate of computer and server products has increased, causing trouble for users, merchants, manufacturers and other links. The industry also uses current detection to feedback the current load situation and adjust the speed of the cooling fan according to the load.

[0004] However, currently, each of the control circuits for the adjustable speed of the cooling fan is specially configured, and it is difficult to be universally applicable to the circuit configuration requirements of the three situations: a single temperature detection mode, a single current detection mode, and a temperature and current detection mode.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0006] In view of this, the utility model aims to address the deficiencies in the prior art, and its main purpose is to provide a power supply forced heat dissipation control circuit and a power supply device with a heat dissipation fan, which can be selectively connected to a temperature sensing circuit and / or a current sensing circuit as needed, so that the voltage can be increased in real time according to the ambient temperature, power supply overload, etc., so as to increase the fan voltage and the fan speed, thereby effectively dissipating the heat of the power supply.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A power forced heat dissipation control circuit includes a power output management circuit, a fan output interface, a first detection circuit setting position, a second detection circuit setting position, a feedback circuit and a boost control circuit;

[0009] The power supply output management circuit is connected to the fan output interface to provide a first output voltage, the first detection circuit setting position and the second detection circuit setting position are respectively connected to the feedback circuit; the first detection circuit setting position is provided with a temperature sensing circuit and / or the second detection circuit setting position is provided with a current sensing circuit; the boost control circuit is respectively connected to the feedback circuit, the power supply output management circuit and the fan output interface, and the boost control circuit performs boost control according to the feedback circuit to provide a second output voltage to the fan output interface, and the second output voltage is greater than the first output voltage.

[0010] As a preferred solution, the temperature sensing circuit includes a thermistor.

[0011] As a preferred solution, a diode D601 is provided between the power output management circuit and the fan output interface, and a diode D2 is provided between the boost control circuit and the fan output interface.

[0012] As a preferred solution, a connection point A is set at the input end of the feedback circuit, a connection point B is set at the input end of the diode D601, a connection point C is set at the power access end of the power output management circuit, the first detection circuit is set to be located between the connection point A and the connection point B, and the second detection circuit is set to be located between the connection point C and the connection point B.

[0013] As a preferred solution, the current sensing circuit includes a current detection circuit and an over-power detection circuit; the current detection circuit includes a detection resistor; the over-power detection circuit includes a current detection chip, the two ends of the current detection circuit are respectively connected to the positive detection pin and the negative detection pin of the current detection chip, and the output pin of the current detection chip is connected to the feedback circuit.

[0014] As a preferred solution, the detection resistor includes more than two resistors connected in parallel.

[0015] As a preferred solution, the boost control circuit includes a buck-boost constant current drive control chip, the buck-boost constant current drive control chip is connected to a transistor Q1, the feedback circuit is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the power output management circuit, and the emitter of the transistor Q1 is connected to the buck-boost constant current drive control chip.

[0016] As a preferred solution, the feedback circuit includes a transistor Q2 and a field effect transistor Q3, the output pin of the current detection chip is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the gate of the field effect transistor Q3, the source of the field effect transistor Q3 is grounded, and the drain of the field effect transistor Q3 is connected to the base of the transistor Q1.

[0017] A power supply device with a cooling fan comprises a shell, a working voltage control circuit and a cooling fan located in the shell, wherein the working voltage control circuit is connected to the cooling fan to provide a working voltage, and the working voltage control circuit is any of the power supply forced cooling control circuits described above.

[0018] As a preferred solution, the power supply device is a computer power supply device or a server power supply device.

[0019] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it is mainly through the setting of the power output management circuit, the fan output interface, the first detection circuit setting position, the second detection circuit setting position, the feedback circuit and the boost control circuit. The first detection circuit setting position is provided with a temperature sensing circuit and / or the second detection circuit setting position is provided with a current sensing circuit. The temperature sensing circuit and / or the current sensing circuit are selectively connected as needed, so that the voltage is boosted in real time according to the ambient temperature, power overload and other conditions to increase the fan voltage, increase the fan speed, and strongly dissipate the heat for the power supply. It can be commonly used for the circuit setting requirements of three situations: a single temperature detection mode, a single current detection mode, and a temperature and current detection mode.

[0020] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a connection block diagram of a power supply forced heat dissipation control circuit of an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of a power supply forced heat dissipation control circuit according to an embodiment of the utility model;

[0023] Figure 3 It is a circuit diagram in which a first detection circuit setting position and a second detection circuit setting position are reserved on the power supply forced heat dissipation control circuit of an embodiment of the utility model;

[0024] Figure 4The first detection circuit setting position and the second detection circuit setting position of the power supply forced heat dissipation control circuit of the embodiment of the utility model are respectively provided with a temperature sensing circuit and a current sensing circuit (temperature and current detection combined mode);

[0025] Figure 5 This is a circuit diagram of the power forced heat dissipation control circuit of the embodiment of the utility model in which only the first detection circuit is provided with a temperature sensing circuit (single temperature detection mode);

[0026] Figure 6 This is a circuit diagram of the power forced heat dissipation control circuit of the embodiment of the utility model in which only the second detection circuit is provided with a current sensing circuit (single current detection mode). DETAILED DESCRIPTION

[0027] Please refer to Figures 1 to 6 As shown, it shows the specific structure of an embodiment of the utility model.

[0028] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] A power supply forced heat dissipation control circuit includes a power supply output management circuit, a fan output interface, a first detection circuit setting position, a second detection circuit setting position, a feedback circuit and a boost control circuit; the power supply output management circuit is connected to the fan output interface to provide a first output voltage. In this embodiment, the first output voltage refers to the normal working voltage of the fan, such as 12V, and the first detection circuit setting position and the second detection circuit setting position are respectively connected to the feedback circuit; the first detection circuit setting position is provided with a temperature sensing circuit and / or the second detection circuit setting position is provided with a current sensing circuit; the boost control circuit is respectively connected to the feedback circuit, the power supply output management circuit and the fan output interface, and the boost control circuit performs boost control according to the feedback circuit to provide the fan output interface with a second output voltage, and the second output voltage is greater than the first output voltage, and usually the second output voltage is 15V to 24V.

[0030] The temperature sensing circuit includes a thermistor and a diode D3 connected in series.

[0031] The current sensing circuit includes a current detection circuit and an over-power detection circuit. The current detection circuit includes a detection resistor. The detection resistor includes more than two resistors arranged in parallel, for example, a first resistor MR3, a second resistor MR4, and a third resistor MR5 arranged in parallel. The over-power detection circuit includes a current detection chip (for example, FP130A), the two ends of the current detection circuit are respectively connected to the positive detection pin (pin 3) and the negative detection pin (pin 4) of the current detection chip, the power pin (pin 5) of the current detection chip is connected to the 12V power supply terminal, the pin 1 of the current detection chip is an output pin, and a resistor placed on the ground can obtain an amplified voltage, and the pin 2 is GND, and the output pin of the current detection chip is connected to the feedback circuit.

[0032] The feedback circuit includes a transistor Q2 and a field effect transistor Q3 (for example, 2N7002, which is an N-polarity MOS transistor), the output pin of the current detection chip is connected to the base of the transistor Q2, the output end of the diode D3 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the gate of the field effect transistor Q3, the source of the field effect transistor Q3 is grounded, and the drain of the field effect transistor Q3 is connected to the base of the transistor Q1.

[0033] The boost control circuit includes a buck-boost constant current drive control chip (e.g., an H8001 chip), the buck-boost constant current drive control chip is connected to a transistor Q1, the feedback circuit is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the power output management circuit, and the emitter of the transistor Q1 is connected to the buck-boost constant current drive control chip. Specifically, a resistor R5 is connected between the pin VIN of the H8001 chip and the emitter of the transistor Q1, the pin VDD of the H8001 chip is connected to a capacitor C9, the pin COMP of the H8001 chip is connected to a resistor R99, the emitter of the transistor Q1 is also connected to an inductor L1, a diode D1 (e.g., ES2D), and a diode D2 (e.g., ES2D), and the output end of the diode D2 is connected to the fan output interface.

[0034] like Figure 3As shown, the first detection circuit is set to be located between the power output management circuit and the feedback circuit, the resistor R604 of the feedback circuit is connected between the base of the transistor Q2 and the output pin (pin 1) of the current detection chip, a connection point A is set at the input end of the resistor R604, a diode D601 is set between the power output management circuit and the fan output interface (and a diode D2 is set between the boost control circuit and the fan output interface), a connection point B is set at the input end of the diode D601, and a connection point C is set at the power access end of the power output management circuit. In this way, the first detection circuit is set to be located between the connection point A and the connection point B, and the second detection circuit is set to be located between the connection point C and the connection point B.

[0035] like Figure 5 As shown, when a temperature sensing circuit needs to be set, the temperature sensing circuit is connected to connection point A and connection point B respectively.

[0036] like Figure 6 As shown, when a current sensing circuit is required, the current sensing circuit is connected to the connection point C and the connection point B respectively.

[0037] like Figure 4 As shown, for application scenarios that require both temperature and current detection, the temperature sensing circuit is connected to connection point A and connection point B respectively, and at the same time, the current sensing circuit is connected to connection point C and connection point B respectively. When the temperature of the internal parts of the power supply is too high, the temperature sensing circuit is controlled by the feedback circuit and then the boost control circuit to control the real-time boost. When the temperature drops to the set temperature or lower than the set temperature, the power output management circuit provides the fan output interface with a first output voltage. When the power supply is overloaded, the current sensing circuit can be instantly controlled by the feedback circuit and then the boost control circuit to control the real-time boost to increase the fan speed, so as to strongly dissipate the heat for the power supply and meet the heat dissipation requirements when the power supply is overloaded. At this time, even if the temperature is not too high, the boost can still be controlled to increase the fan speed.

[0038] Next, a power supply device with a cooling fan is provided, and the power supply may refer to a computer power supply, a server power supply and other various power supplies with fan cooling, which includes a shell and an operating voltage control circuit and a cooling fan arranged in the shell, the operating voltage control circuit is connected to the cooling fan to provide an operating voltage, and the operating voltage control circuit is the power supply forced cooling control circuit described in any of the preceding items, the rated voltage of the cooling fan is 24V, and at a first output voltage (for example, 12V), it is a set normal cooling operating voltage, and the boost control circuit performs boost control according to the feedback circuit to provide a second output voltage (usually up to 15V to 24V) to the fan output interface, so that the voltage can be boosted in real time according to ambient temperature, power supply overload, etc., so as to increase the fan voltage, increase the fan speed, and strongly dissipate heat for the power supply.

[0039] The design focus of the utility model is that it is mainly through the setting of the power output management circuit, the fan output interface, the first detection circuit setting position, the second detection circuit setting position, the feedback circuit and the boost control circuit. The first detection circuit setting position is provided with a temperature sensing circuit and / or the second detection circuit setting position is provided with a current sensing circuit. The temperature sensing circuit and / or the current sensing circuit are selectively connected as needed, so that the voltage is boosted in real time according to the ambient temperature, power overload and other conditions to increase the fan voltage, increase the fan speed, and provide strong heat dissipation for the power supply. It can be commonly used for the circuit setting requirements of three situations: a single temperature detection mode, a single current detection mode, and a temperature and current detection mode.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A power supply forced heat dissipation control circuit, characterized in that: It includes a power output management circuit, a fan output interface, a first detection circuit setting position, a second detection circuit setting position, a feedback circuit and a boost control circuit; The power supply output management circuit is connected to the fan output interface to provide a first output voltage, the first detection circuit setting position and the second detection circuit setting position are respectively connected to the feedback circuit; the first detection circuit setting position is provided with a temperature sensing circuit and / or the second detection circuit setting position is provided with a current sensing circuit; the boost control circuit is respectively connected to the feedback circuit, the power supply output management circuit and the fan output interface, and the boost control circuit performs boost control according to the feedback circuit to provide a second output voltage to the fan output interface, and the second output voltage is greater than the first output voltage.

2. The power forced heat dissipation control circuit according to claim 1, characterized in that: The temperature sensing circuit includes a thermistor.

3. The power forced heat dissipation control circuit according to claim 1, characterized in that: A diode D601 is provided between the power output management circuit and the fan output interface, and a diode D2 is provided between the boost control circuit and the fan output interface.

4. The power forced heat dissipation control circuit according to claim 3, characterized in that: The input end of the feedback circuit is provided with a connection point A, the input end of the diode D601 is provided with a connection point B, the power access end of the power output management circuit is provided with a connection point C, the first detection circuit is provided between the connection point A and the connection point B, and the second detection circuit is provided between the connection point C and the connection point B.

5. The power forced heat dissipation control circuit according to claim 4, characterized in that: The current sensing circuit includes a current detection circuit and an over-power detection circuit; the current detection circuit includes a detection resistor, and the over-power detection circuit includes a current detection chip. The two ends of the current detection circuit are respectively connected to the positive detection pin and the negative detection pin of the current detection chip, and the output pin of the current detection chip is connected to the feedback circuit.

6. The power forced heat dissipation control circuit according to claim 5, characterized in that: The detection resistor includes more than two resistors connected in parallel.

7. The power forced heat dissipation control circuit according to claim 5, characterized in that: The boost control circuit includes a buck-boost constant current drive control chip, the buck-boost constant current drive control chip is connected to a transistor Q1, the feedback circuit is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the power output management circuit, and the emitter of the transistor Q1 is connected to the buck-boost constant current drive control chip.

8. The power forced heat dissipation control circuit according to claim 7, characterized in that: The feedback circuit includes a transistor Q2 and a field effect transistor Q3, the output pin of the current detection chip is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the gate of the field effect transistor Q3, the source of the field effect transistor Q3 is grounded, and the drain of the field effect transistor Q3 is connected to the base of the transistor Q1.

9. A power supply device with a cooling fan, characterized in that: It includes a shell and a working voltage control circuit and a cooling fan located in the shell, wherein the working voltage control circuit is connected to the cooling fan to provide a working voltage, and the working voltage control circuit is the power supply forced cooling control circuit described in any one of claims 1 to 8.

10. The power supply device with a cooling fan according to claim 9, characterized in that: The power supply device is a computer power supply device or a server power supply device.

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