External regulating circuit of direct-current generator

Abstract

The utility model provides an external adjusting circuit of a DC generator. The external adjusting circuit comprises an MCU control module, a voltage acquisition and overvoltage protection absorption module, a current acquisition module, an auxiliary power supply module and an excitation driving module. The signal input end of the auxiliary power supply module is used for receiving a power generator starting signal, and the auxiliary power supply module is used for supplying power to the MCU control module; the signal input end of the MCU control module is used for receiving rotating speed, temperature, output voltage and output current signals of the generator; the signal output end of the MCU control module is connected to the excitation driving module and the overvoltage protection absorption module; and the overvoltage protection absorption module is arranged between the output end of the generator and the GND.

Description

Technical Field

[0001] The utility model relates to a generator, in particular to a DC generator. Background Art

[0002] With the development of modern automobile technology and changes in social life, RVs and even some passenger cars and ships need to meet some of people's life functional needs, such as daily eating, living, and using, which are inseparable from electricity. Therefore, the demand for electricity is increasing. At present, the mainstream power supply system of RVs is a 48V system to meet the needs of high power and long-term electricity consumption. As the capacity of the 48V DC backup energy storage battery on RVs becomes larger and larger, the current mainstream configuration is 15 to 20 degrees of electricity. The previous driving charging method can no longer meet the use needs. The main defects are:

[0003] 1. If Figure 1 As shown, the existing 48V DC generators on the market cannot directly charge the 48V backup lithium battery due to the poor performance of the built-in generator regulator, especially when dumping the load, a high voltage of more than 80V will appear. It needs to go through a first-level bidirectional DCDC conversion to charge the 48V backup battery, which is inefficient and costly.

[0004] 2. If Figure 2 As shown, the output voltage of the existing 12V DC generator on the market is only about 14V, and it needs to go through a first-level DCDC boost to charge the 48V backup battery. At the same time, due to the small output power (mainstream is 1000-2000W), a 2000W 12V generator also needs up to 10 hours to fully charge a 20-degree battery, which is inefficient and costly. Utility Model Content

[0005] The main technical problem to be solved by the utility model is to provide an external regulating circuit for a DC generator, solve the problem of high voltage of the generator under load dumping conditions and realize that the generator directly charges the backup battery.

[0006] In order to solve the above technical problems, the utility model provides an external regulating circuit of a DC generator, including: an MCU control module, a voltage acquisition and overvoltage protection absorption module, a current acquisition module, an auxiliary power supply module, and an excitation drive module;

[0007] The signal input end of the auxiliary power supply module is used to receive the generator start-up signal, and the auxiliary power supply module is used to power the MCU control module; the signal input end of the MCU control module is used to receive the generator speed, temperature, output voltage, and output current signals; the signal output end of the MCU control module is connected to the excitation drive module and the overvoltage protection absorption module.

[0008] In a preferred embodiment: the excitation drive module includes a protection switch tube Q1 and an excitation switch tube Q2; the protection switch tube Q1 is connected between the D pole of the excitation switch tube Q2 and the generator excitation coil.

[0009] In a preferred embodiment: the protection switch tube Q1 is connected to the positive output electrode of the generator through a diode D1.

[0010] In a preferred embodiment: the overvoltage protection absorption module includes an absorption switch tube Q3, which is connected between the output end of the generator and GND.

[0011] In a preferred embodiment: when the generator speed, temperature, output voltage and output current signals are normal, the signal output end of the MCU control module outputs a high-level signal to control the protection switch tube to be turned on, and outputs a PWM signal to control the intermittent conduction of the excitation switch tube Q2.

[0012] In a preferred embodiment: when any of the generator speed, temperature, output voltage, and output current signals is abnormal, the signal output terminal of the MCU control module outputs a signal to control the protection switch tube Q1 and the excitation switch tube Q2 to be disconnected.

[0013] In a preferred embodiment: when the output voltage signal is abnormal, the signal output terminal of the MCU control module outputs a signal to control the absorption switch tube Q3 to be turned on.

[0014] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0015] 1. The utility model provides an external regulating circuit for a DC generator. By optimizing the regulator circuit design, the output performance of the generator is greatly improved, the high voltage problem of the generator under load dumping conditions is solved, and the generator can directly charge the 48V backup battery to solve the problem of high-power driving charging. At the same time, it simplifies the system, improves reliability, and improves charging efficiency, which is beneficial to energy conservation and emission reduction.

[0016] 2. The utility model provides an external regulation circuit for a DC generator, which only requires the generator output to be directly connected to a 48V backup battery without a primary DCDC conversion;

[0017] 3. The utility model provides an external regulating circuit for a DC generator, and the generator regulator is externally placed to achieve a more superior and intelligent power generation function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 and Figure 2 It is a schematic diagram of the regulation principle of a DC generator in the prior art;

[0019] Figure 3 This is a schematic diagram of the regulation principle of the DC generator in the preferred embodiment of the utility model;

[0020] Figure 4 The present invention is a circuit diagram of an external regulating circuit of a DC generator in one embodiment of the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0024] refer to Figure 3 and Figure 4 , This embodiment provides an external regulation circuit for a DC generator, including: an MCU control module, a voltage acquisition and overvoltage protection absorption module, a current acquisition module, an auxiliary power supply module, and an excitation drive module;

[0025] The signal input end of the auxiliary power supply module is used to receive the generator start-up signal, and the auxiliary power supply module is used to power the MCU control module; the signal input end of the MCU control module is used to receive the generator speed, temperature, output voltage, and output current signals; the signal output end of the MCU control module is connected to the excitation drive module and the overvoltage protection absorption module.

[0026] Specifically, the excitation drive module includes a protection switch tube Q1 and an excitation switch tube Q2; the protection switch tube Q1 is connected between the D pole of the excitation switch tube Q2 and the generator excitation coil, and in particular, the protection switch tube Q1 is connected to the positive pole of the generator output through a diode D1. Therefore, by disconnecting the protection switch tube Q1 and the excitation switch tube Q2, the excitation can be turned off, and then the generator output can be turned off, achieving reliable protection;

[0027] The overvoltage protection absorption module includes an absorption switch tube Q3, which is connected between the output end of the generator and GND.

[0028] When the hardware power-on dry contact is closed or the vehicle I GN signal is high, the auxiliary power module in the external regulation circuit ACU detects the power-on signal, the auxiliary power module starts, supplies power to the MCU control module, and sends the power-on signal to the MCU control module;

[0029] After the MCU control module starts working, it detects the generator speed, temperature, output voltage, and output current signals. If the signals are normal, it controls the excitation drive module to drive the excitation power module to operate. Specifically, the signal output end of the MCU control module outputs a high-level signal to control the conduction of the protection switch tube, and outputs a PWM signal to control the intermittent conduction of the excitation switch tube Q2, so that after the generator is excited, the output voltage is used to charge the battery.

[0030] During the operation of the generator, the MCU detects the generator speed, temperature, output voltage, and output current signals, and performs closed-loop control by controlling the excitation drive to adjust the output voltage and current.

[0031] The external regulation circuit ACU also has the functions of abnormal speed, abnormal temperature, overvoltage and overcurrent protection:

[0032] ① Abnormal speed protection: When the generator speed is too high, the external adjustment circuit ACU quickly disconnects the excitation circuit protection MOS tube Q1 and the excitation MOS tube Q2, turns off the excitation, and then turns off the generator output to achieve reliable protection;

[0033] ② Abnormal temperature protection: When the external regulation circuit ACU detects that the temperature of the generator and the radiator are too high or too low, it quickly disconnects the excitation circuit protection MOS tube Q1 and the excitation MOS tube Q2, turns off the excitation, and then turns off the generator output to achieve reliable protection;

[0034] ③ Overcurrent protection: When the generator output is overcurrent, the external regulation circuit ACU quickly disconnects the excitation circuit protection MOS tube Q1 and the excitation MOS tube Q2, turns off the excitation, and then turns off the generator output to achieve reliable protection;

[0035] ④ Overvoltage protection: If the generator output side suddenly dumps the load (that is, the battery is suddenly disconnected during high-power operation), there will be a high voltage on the generator output side. When the overvoltage protection point preset by the external regulation circuit ACU is reached, the excitation circuit protection MOS tube Q1 and the excitation MOS tube Q2 are quickly disconnected, the excitation is turned off, and then the generator output is turned off. At the same time, the absorption MOS tube Q3 is turned on, and the overvoltage protection absorption circuit takes effect, absorbing the peak voltage and energy generated instantaneously by the generator, which will not cause overvoltage damage to other equipment at the generator output end (that is, directly hung on the battery), and reliably protect all equipment.

[0036] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. An external regulating circuit for a DC generator, characterized in that include: MCU control module, voltage acquisition and overvoltage protection absorption module, current acquisition module, auxiliary power supply module, excitation drive module; The signal input end of the auxiliary power supply module is used to receive the generator start-up signal, and the auxiliary power supply module is used to supply power to the MCU control module; the signal input end of the MCU control module is used to receive the generator speed, temperature, output voltage, and output current signals; the signal output end of the MCU control module is connected to the excitation drive module and the overvoltage protection absorption module; The overvoltage protection absorption module is arranged between the output end of the generator and GND.

2. The external regulating circuit of a DC generator according to claim 1, characterized in that: The excitation drive module includes a protection switch tube Q1 and an excitation switch tube Q2; the protection switch tube Q1 is connected between the D pole of the excitation switch tube Q2 and the excitation coil of the generator.

3. The external regulating circuit of a DC generator according to claim 2, characterized in that: The protection switch tube Q1 is connected to the generator output positive electrode through a diode D1.

4. The external regulating circuit of a DC generator according to claim 1, characterized in that: The overvoltage protection absorption module includes an absorption switch tube Q3, which is connected between the output end of the generator and GND.

5. The external regulating circuit of a DC generator according to claim 2, characterized in that: When the generator speed, temperature, output voltage and output current signals are normal, the signal output terminal of the MCU control module outputs a high-level signal to control the protection switch tube Q1 to be turned on, and outputs a PWM signal to control the excitation switch tube Q2 to be intermittently turned on.

6. The external regulating circuit of a DC generator according to claim 2, characterized in that: When any of the generator speed, temperature, output voltage and output current signals is abnormal, the signal output terminal of the MCU control module outputs a signal to control the protection switch tube Q1 and the excitation switch tube Q2 to be disconnected.

7. The external regulating circuit of a DC generator according to claim 4, characterized in that: When the output voltage signal is abnormal, the signal output terminal of the MCU control module outputs a signal to control the absorption switch tube Q3 to be turned on.

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