Generator with over-temperature protection

Abstract

The utility model discloses a generator with over-temperature protection, which comprises a stator winding, a rotor winding, a regulator and a rectifier, the stator winding is provided with a temperature sensor, the temperature sensor feeds back a temperature signal of the stator winding to the regulator, the regulator is communicated with the rotor winding, and the rectifier is communicated with the rotor winding. And the current of the rotor winding is controlled through the temperature signal. The beneficial effects are that 1, the stator winding is provided with the temperature sensor, the temperature of a target is directly detected, the detection data is accurate, the control effect of a corresponding regulator is also accurate, the power generation amount is reduced, the temperature of the generator is reduced, and the normal work of the generator is protected; and 2, the temperature sensor is integrated in the regulator chip, so that the over-temperature protection function can be realized only by replacing the regulator chip or a circuit without changing the original generator structure.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive generators, and specifically to a generator with over-temperature protection. Background Art

[0002] When the installation position of the generator is close to heat sources such as the engine exhaust manifold or the turbocharger, affected by the thermal radiation of these components, the air temperature around the generator will rise. When the generator is in such a high-temperature environment, the air-cooling heat dissipation efficiency will be greatly affected, and it is very difficult to take away its own heat by the surrounding high-temperature air. Working at full load in this condition for a long time will cause the stator winding or diode of the generator to overheat, be damaged and fail, and the generator cannot work properly. When the generator is used in agricultural machinery such as harvesters, after a certain period of use, a large amount of weeds and foreign objects in the field will block the air inlet duct of the rectifier bridge at the rear end of the generator. At this time, if no manual cleaning is carried out (usually the end users will not clean the generator regularly), the heat dissipation efficiency of the generator will be reduced due to the decrease in the air intake volume, the temperature of the generator diode will rise, and finally the diode will overheat and fail, resulting in the generator being unable to work properly. Summary of the Invention

[0003] The purpose of the utility model is to solve the existing problems and provide a generator with over-temperature protection.

[0004] The technical solution of the utility model is as follows:

[0005] A generator with over-temperature protection includes a stator winding, a rotor winding, a regulator and a rectifier. A temperature sensor is installed on the stator winding. The temperature sensor feeds back the stator winding temperature signal to the regulator, and the regulator is connected to the rotor winding to control the magnitude of the current in the rotor winding through the temperature signal.

[0006] Preferably, the rectifier is composed of 3 pairs of positive and negative diodes.

[0007] Preferably, the regulator includes a voltage stabilizing module and a regulator chip.

[0008] Preferably, the temperature sensor is integrated inside the regulator chip.

[0009] Preferably, the temperature sensor is a thermistor.

[0010] Preferably, the first connection bit of the regulator chip is connected to the IG switch control terminal through a voltage stabilizing module, the B+ terminal is connected to the second connection bit of the regulator chip through a voltage dividing circuit, a rotor winding is connected between the B+ terminal and the F terminal, the F terminal is connected to the fourth connection bit of the regulator chip and grounded through a MOS transistor, the fifth connection bit of the regulator chip is connected to the gate of the MOS transistor and grounded through a voltage dividing circuit, and the sixth connection bit of the regulator chip is connected to a temperature sensor.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. A temperature sensor is installed on the stator winding to directly detect the temperature of the target. The detection data is accurate, and the corresponding regulator control effect is also accurate, realizing a decrease in power generation, thereby reducing the temperature of the generator and protecting the normal operation of the generator.

[0013] 2. By integrating the temperature sensor inside the regulator chip, the original structure of the generator does not need to be changed, and the over-temperature protection function can be achieved only by replacing the regulator chip or the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a circuit schematic diagram of Embodiment 1 of the present utility model;

[0015] Figure 2 is a circuit schematic diagram of Embodiment 2 of the present utility model;

[0016] Figure 3 is a schematic diagram of the regulator chip of the present utility model;

[0017] In the drawings: 1. Stator winding; 2. Rotor winding; 3. Regulator; 4. Rectifier; 5. Temperature sensor; 6. Voltage stabilizing module; 7. Regulator chip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation on the present utility model.

[0020] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0021] In the present utility model, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0023] Such as Figure 1 and 3As shown, embodiment 1: a generator with over-temperature protection, including a stator winding 1, a rotor winding 2, a regulator 3 and a rectifier 4, wherein a temperature sensor 5 is installed on the stator winding 1, and the temperature sensor 5 feeds back the temperature signal of the stator winding 1 to the regulator 3, and the regulator 3 is connected to the rotor winding 2, and controls the current of the rotor winding 2 through the temperature signal. The regulator 3 controls the duty cycle of the rotor winding 2 according to the temperature signal, adjusts the current of the rotor winding 2, and further controls the power generation (load) of the stator winding 1. When the temperature value represented by the corresponding signal of the temperature sensor 5 reaches the set temperature, the regulator 3 will reduce the current of the rotor winding 2, reduce the power generation (load), and further reduce the temperature of the generator. For example, if the temperature resistance level of the stator winding or diode is 200℃, when the temperature sensor 5 detects that the temperature of the target component reaches 200℃, the signal is transmitted to the regulator chip 7 to immediately trigger the duty cycle of the rotor winding 2 to be limited. Assuming that the duty cycle is limited to 10%, the average current passing through the rotor winding 2 is 90% of the maximum value, and the power generation of the generator (the current carried by the stator winding 1 or the diode) will decrease (for example, it will decrease to 90% of the maximum power generation), and the heat energy generated by the generator will decrease accordingly. When the temperature drops to a set value (for example, 195℃), the temperature sensor 5 transmits a signal to the regulator chip 7 to release the limit on full-load power generation, and the temperature gradually rises. This process is repeated over and over again, and the temperature of the measured component is always kept within its temperature resistance level.

[0024] Specifically, the rectifier 4 is composed of three pairs of positive and negative diodes.

[0025] Specifically, the regulator 3 includes a voltage stabilizing module 6 and a regulator chip 7 .

[0026] like Figure 2As shown, Embodiment 2: The temperature sensor 5 is integrated inside the regulator chip 7. There is a certain proportional relationship between the temperature of the generator stator winding 1, the temperature of the diode, the temperature of the regulator 3 chip, and the ambient temperature. When the ambient temperature rises, the temperatures of the stator winding 1, the diode, and the regulator 3 will rise accordingly. Through experimental calibration, the temperature relationship between them can be determined. According to this relationship, the temperature of the regulator 3 and the power generation amount are calibrated and set, which can also achieve the effect of controlling the power generation amount through temperature, and thus play an over-temperature protection role. For example: When the temperature sensor 5 inside the regulator 3 detects that the temperature exceeds the first set value of 110°C and reaches the second set value (for example, 115°C), according to the previous test calibration data, the corresponding stator or diode temperature at this time is 205°C. The signal is transmitted to the regulator chip 7 to immediately trigger the duty cycle of the rotor winding 2 to be restricted. For example, the duty cycle is restricted to 20%. At this time, the average current passing through the rotor winding 2 is 80% of the maximum value, and the power generation amount of the generator (the current carried by the stator winding or the diode) will decrease (for example, decrease to 80% of the maximum power generation amount), and the heat energy generated by the generator will correspondingly decrease. When the temperature drops to a set value (for example, 195°C), the temperature sensor 5 transmits a signal to the regulator chip 7 to lift the restriction on full-load power generation. As the temperature gradually rises, this process is repeated cyclically, always keeping the temperature of the measured component parts not exceeding their temperature resistance grade.

[0027] Specifically, the temperature sensor 5 is a thermistor.

[0028] As Figure 2 and 3 As shown, the first connection bit of the regulator chip 7 is connected to the IG switch control terminal through the voltage stabilization module 6. The B+ terminal is connected to the second connection bit of the regulator chip 7 through a voltage division circuit. There is a rotor winding 2 connected between the B+ terminal and the F terminal. The F terminal is connected to the fourth connection bit of the regulator chip 7 and grounded through a MOS tube. The fifth connection bit of the regulator chip 7 is connected to the gate of the MOS tube and grounded through a voltage division circuit. The sixth connection bit of the regulator chip 7 is connected to the temperature sensor 5.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A generator with over-temperature protection, comprising a stator winding, a rotor winding, a regulator and a rectifier, characterized in that: A temperature sensor is installed on the stator winding. The temperature sensor feeds back the temperature signal of the stator winding to the regulator. The regulator is connected to the rotor winding and controls the current of the rotor winding through the temperature signal.

2. The generator with over-temperature protection according to claim 1, characterized in that: The rectifier is composed of three pairs of positive and negative diodes.

3. The generator with over-temperature protection according to claim 1, characterized in that: The regulator includes a voltage stabilizing module and a regulator chip.

4. The generator with over-temperature protection according to claim 3, characterized in that: The temperature sensor is integrated inside the regulator chip.

5. The generator with over-temperature protection according to claim 1, characterized in that: The temperature sensor is a thermistor.

6. The generator with over-temperature protection according to claim 5, characterized in that: The thermistor is attached to the stator winding.

7. The generator with over-temperature protection according to claim 3, characterized in that: The first connection position of the regulator chip is connected to the IG switch control terminal through the voltage stabilizing module, the B+ terminal is connected to the second connection position of the regulator chip through a voltage divider circuit, a rotor winding is connected between the B+ terminal and the F terminal, the F terminal is connected to the fourth connection position of the regulator chip and is grounded through a MOS tube, the fifth connection position of the regulator chip is connected to the MOS tube gate and the ground through a voltage divider circuit, and the sixth connection position of the regulator chip is connected to the temperature sensor.

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