Constant-power motor circuit applied to water cooling fan

Abstract

The embodiment of the utility model discloses a constant power motor circuit applied to a water cooling fan. The constant power motor circuit comprises a PWM speed regulation signal detection circuit used for detecting the current rotating speed of a motor; the three-phase half-bridge circuit is used for driving the motor; the voltage detection circuit is used for detecting three-phase voltage of the motor; the power output circuit is used for supplying power; and the motor driving chip is used for controlling the rotating speed of the motor through a three-phase half-bridge circuit. The air volume can be controlled to be constant, and the user experience is improved; compared with the prior art, the utility model can be applied to more use environments, and the market competitiveness is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water cooling fan, especially relates to a constant power motor circuit applied to water cooling fan. BACKGROUND

[0002] The existing water cooling fan changes the air duct when there is foreign matter in the air duct or air outlet in the working state, and the air volume will be small. That is, the motor speed of the existing water cooling fan does not change when the air outlet is blocked, and the air volume decreases with the change of the air outlet. SUMMARY

[0003] The technical problem to be solved by the embodiment of the utility model is to provide a constant power motor circuit applied to water cooling fan, so that the motor speed is improved when the air duct is changed, and the air volume is constant.

[0004] In order to solve the above technical problem, the utility model embodiment provides a constant power motor circuit applied to water cooling fan, which comprises:

[0005] A PWM speed signal detection circuit for detecting the current speed of the motor and adjusting the motor speed;

[0006] A three-phase half-bridge circuit for driving the motor;

[0007] A voltage detection circuit for detecting the three-phase voltage of the motor;

[0008] A power supply output circuit for power supply; and

[0009] A motor drive chip for controlling the motor speed through the three-phase half-bridge circuit;

[0010] The motor drive chip is electrically connected with the power supply output circuit, the PWM speed signal detection circuit, the voltage detection and the three-phase half-bridge circuit.

[0011] Further, the three-phase half-bridge circuit comprises three NP double-channel MOS tubes respectively controlling the three phases of the motor, and the motor drive chip controls the speed of the motor by controlling the opening frequency of the three NP double-channel MOS tubes.

[0012] Further, the three-phase half-bridge circuit comprises three groups of resistance pairs, one end of each of the three groups of resistance pairs is connected with the S1 pin of the three NP double-channel MOS tubes, and the other end is connected with the IO port of the motor drive chip.

[0013] Further, the resistance pair is composed of two parallel resistors.

[0014] Further, it further comprises a burning interface, and the burning interface is electrically connected with the motor drive chip.

[0015] The utility model discloses a beneficial effect is: the utility model discloses can control the constant of air volume, increase user experience, compare with traditional technology, the utility model discloses can be applied to more use environment, increase market competitiveness. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic diagram of constant power motor circuit of the utility model embodiment's application on water cooling fan.

[0017] Figure 2 It is the circuit diagram of three -phase half bridge circuit of the utility model embodiment.

[0018] Figure 3 It is the circuit diagram of motor drive chip of the utility model embodiment.

[0019] Figure 4 It is the circuit diagram of power output circuit of the utility model embodiment.

[0020] Figure 5 It is the circuit diagram of PWM speed regulation signal detection circuit of the utility model embodiment.

[0021] Figure 6 It is the circuit diagram of voltage detection circuit of the utility model embodiment.

[0022] Figure 7 It is the circuit diagram of burning interface of the utility model embodiment. DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0024] In the embodiment of the utility model, if there is a directional indication (such as up, down, left, right, front, back, etc.), it is only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, in the utility model, if the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature.

[0026] Please refer to Figures 1-7 The constant power motor circuit applied on the water cooling fan of the utility model embodiment includes a PWM speed regulation signal detection circuit, a three-phase half bridge circuit, a voltage detection circuit, a power output circuit and a motor drive chip.

[0027] The PWM speed control signal detection circuit is used to detect the current motor speed and adjust the motor speed accordingly. The three-phase half-bridge circuit connects to the motor and drives and controls it. The voltage detection circuit detects the three-phase voltage of the motor. The power output circuit provides power. The motor driver chip is electrically connected to the power output circuit, the PWM speed control signal detection circuit, the voltage detection circuit, and the three-phase half-bridge circuit. Based on the detected values, the motor driver chip controls the motor speed through the three-phase half-bridge circuit.

[0028] In one implementation, the three-phase half-bridge circuit includes three NP dual-channel MOS transistors (i.e., MOSFETs) that control the three phases of the motor respectively. Figure 2 The motor driver chip (Q1, Q2, Q3) controls the motor speed by controlling the turn-on frequency of three NP dual-channel MOSFETs.

[0029] In one implementation, a three-phase half-bridge circuit includes three sets of resistor pairs (each resistor pair consists of two resistors connected in parallel, i.e.) Figure 2 The three sets of resistors (RS1 and RS2, RS3 and RS4, RS5 and RS6) are connected at one end to the S1 pin of the three NP dual-channel MOS transistors, and at the other end to the IO port of the motor driver chip.

[0030] As one implementation method, a programming interface is also included, which is electrically connected to the motor driver chip to facilitate the user's programming.

[0031] The working principle of this invention is as follows: When the air duct is altered, the current flowing through resistors RS5 and RS6 changes. The current flows into the motor driver chip through R21. The motor driver chip determines whether the current has increased or decreased, and then controls the switching frequency of Q1, Q2, and Q3 (N+PMOS) to change the motor speed. This achieves the effect of constant power by changing the motor speed.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A constant power motor circuit for use in water-cooled fans, characterized in that, The application relates to a motor driving chip and a motor driving system. The motor driving chip comprises the following parts: a PWM speed signal detection circuit for detecting the current rotating speed of a motor and adjusting the rotating speed of the motor; a three-phase half-bridge circuit for driving the motor; a voltage detection circuit for detecting the three-phase voltage of the motor; a power output circuit for power supply; and a motor driving chip for controlling the rotating speed of the motor through the three-phase half-bridge circuit.

2. The constant power motor circuit for use in a water cooled fan of claim 1, wherein, The motor driving chip is electrically connected with the power output circuit, the PWM speed signal detection circuit, the voltage detection circuit and the three-phase half-bridge circuit.

3. The constant power motor circuit for use in a water cooled fan of claim 2, wherein, The three-phase half-bridge circuit comprises three NP double-channel MOS transistors for controlling the three phases of the motor respectively, and the motor driving chip controls the rotating speed of the motor by controlling the opening frequency of the three NP double-channel MOS transistors.

4. The constant power motor circuit for use in a water cooled fan of claim 3, wherein, The three-phase half-bridge circuit comprises three groups of resistance pairs, one end of each of the three groups of resistance pairs is connected with the S1 pin of the three NP double-channel MOS transistors respectively, and the other end is connected with the IO port of the motor driving chip.

5. The constant power motor circuit for use in a water cooled fan of claim 1, wherein, The resistance pair is composed of two parallel resistors. The motor driving chip further comprises a burning interface which is electrically connected with the motor driving chip.

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