Cooling fan module
First Claim
1. A cooling fan module comprising:
- a motor, a fan driven by the motor and a speed controller connected in series between the motor and a power supply for the motor, wherein the speed controller comprises a high speed branch and a low speed branch, the low speed branch comprises a pulse width modulation circuit connected in series, and the pulse width modulation circuit is configured to reduce an average voltage by a fixed duty ratio to achieve a low speed operation of the motor, the power supply supplies power to the motor through one of the high speed branch and the low speed branch when the other one of the high speed branch and the low speed branch is disrupted;
wherein the speed controller comprises a printed circuit board supporting the pulse width modulation circuit;
the speed controller comprises a shell and a heat sink, and the shell and the heat sink are of half-shell structures which are joined together to form a full outer shell, and the heat sink has an inner surface and an outer surface, and the inner surface of the heat sink is recessed downward to form a cavity, and the cavity has a wall which protrudes from the outer surface of the heat sink, and edges of the inner surface of the heat sink form discrete protrusions abutting against the printed circuit board; and
the printed circuit board is installed inside the heat sink and heat is dissipated through the heat sink;
the speed controller comprises two output cables;
the shell comprises a connector, and the connector comprises several input terminals, and several input terminals are installed inside the connector;
one end of several input terminals are for receiving an input voltage from an external power, and the other end of two of several input terminals are directly electrically connected to two output cables, respectively;
the output cables extend out of the speed controller, and the output cables are connected to the motor of the cooling fan module.
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Accused Products
Abstract
A cooling fan module for a heat exchanger or the like, has a motor, a fan driven by the motor and a speed controller connected between the motor and a power supply. The speed controller is configured to operate the motor in a high speed mode and a low speed mode. The speed controller includes a high speed branch and a low speed branch connected in parallel. The low speed branch includes a pulse width modulation circuit configured to reduce an average voltage by a fixed duty ratio to achieve a low speed operation of the motor. By eliminating the conventional voltage dropping resistor, the speed controller reduces the power consumption, thus increasing the efficiency of the module, in the low speed mode of operation.
37 Citations
12 Claims
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1. A cooling fan module comprising:
- a motor, a fan driven by the motor and a speed controller connected in series between the motor and a power supply for the motor, wherein the speed controller comprises a high speed branch and a low speed branch, the low speed branch comprises a pulse width modulation circuit connected in series, and the pulse width modulation circuit is configured to reduce an average voltage by a fixed duty ratio to achieve a low speed operation of the motor, the power supply supplies power to the motor through one of the high speed branch and the low speed branch when the other one of the high speed branch and the low speed branch is disrupted;
wherein the speed controller comprises a printed circuit board supporting the pulse width modulation circuit;
the speed controller comprises a shell and a heat sink, and the shell and the heat sink are of half-shell structures which are joined together to form a full outer shell, and the heat sink has an inner surface and an outer surface, and the inner surface of the heat sink is recessed downward to form a cavity, and the cavity has a wall which protrudes from the outer surface of the heat sink, and edges of the inner surface of the heat sink form discrete protrusions abutting against the printed circuit board; and
the printed circuit board is installed inside the heat sink and heat is dissipated through the heat sink;
the speed controller comprises two output cables;
the shell comprises a connector, and the connector comprises several input terminals, and several input terminals are installed inside the connector;
one end of several input terminals are for receiving an input voltage from an external power, and the other end of two of several input terminals are directly electrically connected to two output cables, respectively;
the output cables extend out of the speed controller, and the output cables are connected to the motor of the cooling fan module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a motor, a fan driven by the motor and a speed controller connected in series between the motor and a power supply for the motor, wherein the speed controller comprises a high speed branch and a low speed branch, the low speed branch comprises a pulse width modulation circuit connected in series, and the pulse width modulation circuit is configured to reduce an average voltage by a fixed duty ratio to achieve a low speed operation of the motor, the power supply supplies power to the motor through one of the high speed branch and the low speed branch when the other one of the high speed branch and the low speed branch is disrupted;
Specification