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Automobile low-voltage power supply charging device

A low-voltage power supply and charging device technology, which is applied to battery circuit devices, circuit devices, electric vehicles, etc., can solve problems such as battery hazards, high-current charging of batteries, and inability to meet the requirements of large load currents of electrical appliances, so as to reduce damage, The effect of extending the service life

Active Publication Date: 2012-07-25
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of such a circuit structure is that if the output current of the DC / DC is limited, it may not be able to meet the requirements of the large load current of the electrical appliance. cause harm

Method used

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  • Automobile low-voltage power supply charging device
  • Automobile low-voltage power supply charging device
  • Automobile low-voltage power supply charging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one, such as figure 1 , 2 As shown, the automobile low-voltage power supply charging device includes an automobile DC / DC inverter power supply 1 and a storage battery 4, the output terminal of the automobile DC / DC inverter power supply 1 supplies power to the vehicle electrical appliance 5, and the output terminal of the automobile DC / DC inverter power supply 1 terminal also charges the battery 4 through the voltage regulator current limiter 3. The freewheeling diode 2 is connected in parallel at both ends of the voltage regulator current limiter 3 so that the battery 4 supplies power to the vehicle electrical appliance 5, the anode of the freewheeling diode 2 is connected to the positive pole of the battery 4, and the cathode of the freewheeling diode 2 is connected to the DC / DC inverter of the vehicle. Connect the variable power supply 1.

[0029] The voltage stabilizing current limiter 3 is connected with a control unit 6 capable of controlling the volta...

Embodiment 2

[0033] Embodiment two, such as figure 1 , image 3 As shown, as the second scheme of the voltage stabilizing current limiter 3, in the vehicle low-voltage power supply charging device, the voltage stabilizing current limiter 3 includes an IGBT, the input terminal of the trigger 61 is connected with the gate G of the IGBT, and the set of the IGBT The electrode C is connected to the output terminal of the automobile DC / DC inverter power supply 1 , and the emitter E of the IGBT is connected to the positive pole of the storage battery 4 . All the other connection structures are the same as in Embodiment 1. The trigger 61 controls the voltage applied to the gate G of the IGBT, thereby controlling the change of the turn-on and turn-off time of the collector C and the emitter E of the IGBT to control the output current, ensuring that the DC / DC inverter power supply can charge the battery The current is the most suitable small current for the battery.

Embodiment 3

[0034] Embodiment three, such as figure 1 , Figure 4 As shown, the triode in the above-mentioned stabilized current limiter 3 is replaced by a field effect tube. The present embodiment is an example of a MOS tube in a field effect tube. The source S of the MOS tube is connected to the DC / DC inverter power supply of the car through a wire 1 connection, the gate G of the MOS transistor is connected to the output terminal of the flip-flop 61, the drain D of the MOS transistor is connected to the storage battery 4, and the freewheeling diode 2 is reversely connected between the source S and the drain D of the MOS transistor , and the rest of the connection structure is the same as that of Embodiment 1. The trigger 61 uses the detection signals of the temperature sensor 62 and the current sensor 63 as a trigger signal to output a control current to change the current of the gate G of the MOS transistor, which also changes the voltage between the gate and the source, thereby chang...

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PUM

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Abstract

The invention provides an automobile low-voltage power supply charging device belonging to the technical field of automobile storage batteries, and solving the problems that in the prior art, the requirement for heavy-load current of an electrical appliance possibly can not be met if the DC / DC (direct current) output current is limited, however if the DC / DC current is not limited, heavy-current charge of a storage battery possibly happens to harm the storage battery. The automobile low-voltage power supply charging device comprises an automobile DC / DC inverter power supply and a storage battery; an output end of the automobile DC / DC inverter power supply supplies power to a vehicular electrical appliance; the output end of the automobile DC / DC inverter power supply also charges the storage battery through a voltage-stabilizing current limiter; the voltage-stabilizing current limiter is connected with a control unit capable of controlling the on / off of the voltage-stabilizing current limiter; and the two ends of the voltage-stabilizing current limiter are connected in parallel with a fly-wheel diode so that the storage battery supplies power to the vehicular electrical appliance. The automobile low-voltage power supply charging device provided by the invention not only can realize low-current charge of the storage battery, but also can meet the requirement for the power supply of the heavy-load electrical appliance in the automobile.

Description

technical field [0001] The invention belongs to the technical field of automobile accumulators, and relates to an automobile low-voltage power supply charging device. Background technique [0002] In the low-voltage power supply of the vehicle, the DC / DC inverter power supply and the 12V battery power supply are connected in parallel to the electrical circuit of the vehicle. Generally, the battery does not discharge when the vehicle is running, and the current of the electrical appliances is all supplied by the DC / DC inverter. Only when the load of the electrical appliances suddenly increases, the battery starts to discharge. The ACC gear is "powering some electrical appliances in the car without starting the car", and the ON gear is "powering all electrical appliances in the car". In the state of ACC or ON gear, the power used for work is provided by low-voltage batteries. , such as the power used to enjoy music when the ACC gear is in place. [0003] Using electrical app...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 包寿红赵福全
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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