DC/DC control and drive circuit of hybrid power excavator

A driving circuit, hybrid technology, applied in emergency protection circuit devices, electrical components, conversion equipment without intermediate conversion to AC, etc., can solve the problem of insufficient matching, affecting the safe use of capacitors, motor driving force, and inability to accurately and quickly control voltage. Conversion volume and other issues, to achieve the effect of improving response speed and sensitivity, improving use safety, and avoiding delay and interference

Inactive Publication Date: 2010-11-17
SANY HEAVY MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the above, the current DC / DC is not perfect enough. When it is used in a hybrid excavator with large current and large capacitance, it cannot accurately and quickly control the voltage conversion amount, and the matching is insufficient, which affects the safety of the capacitor and the drive of the motor. force

Method used

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  • DC/DC control and drive circuit of hybrid power excavator
  • DC/DC control and drive circuit of hybrid power excavator
  • DC/DC control and drive circuit of hybrid power excavator

Examples

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Embodiment 1

[0023] Embodiment one: see Figure 1~3 As shown, a DC / DC control and drive circuit for a hybrid excavator includes a charging circuit, a discharging circuit and a pre-pressing circuit, the charging circuit is controlled and connected by the first switch tube S1, and the pre-circuit is arranged , Between the discharge circuit and the capacitor C2, the first relay J1 is connected in parallel with a current limiting circuit, and the current limiting circuit is composed of the second relay J2 and the current limiting resistor R3 connected in series; the discharge circuit is a boost circuit, It includes a second switching tube S2, a power inductor L, a freewheeling diode D1, and an output filter capacitor C1. The control terminal of the second switching tube S2 is connected to a PWM control circuit, and the PWM control circuit is composed of sampling resistors R1, R2, light Coupled isolation amplifier HCPL-7800, PWM controller SG2525 and drive circuit, the sampling points of the sa...

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PUM

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Abstract

The invention discloses a DC / DC control and drive circuit of a hybrid power excavator, which comprises a charging circuit, a discharging circuit and a pre-charging circuit, and is characterized in that: the control end of a second switching tube is connected with a PWM control circuit, the PWM control circuit is comprised of a sampling resistor, a light-coupled isolation amplifier, a PWM controller and a driving circuit, and the sampling points of the sampling resistor are connected with the two ends of an output filter capacitor of a booster circuit respectively; and the pre-charging circuitis formed by connecting a first relay and a limiting circuit in parallel. In the DC / DC control and drive circuit, the PWM control circuit provides switching pulse for driving the second switching tube in the discharging circuit, so the response is quick, the delay of a signal transmission process is delayed, and the accurate control over the voltage of a direct current bus is realized; and meanwhile, the pre-charging circuit provides charging protection for the capacitor, so the charging circuit is more safe and the service life is prolonged.

Description

technical field [0001] The invention relates to a DC / DC control drive circuit, in particular to a DC / DC control and drive circuit for a hybrid excavator. Background technique [0002] The so-called hybrid power generally refers to a gasoline-electric hybrid power, that is, a mixture of fuel (gasoline, diesel, etc.) and electric energy. A hybrid excavator is an excavator driven by an electric motor as the auxiliary power of the engine. The fuel economy performance of the hybrid excavator is high, and the overall performance is superior. The engine of the hybrid excavator uses fuel, and when starting, accelerating, and turning, it can reduce fuel consumption due to the assistance of the electric motor. Simply put, That is, compared with an excavator of the same size, the fuel cost is lower. [0003] When the engine starts or the engine accelerates and the rotary motor rotates, the supercapacitor connected to the DC bus can provide instantaneous discharge power and drive the ...

Claims

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Application Information

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IPC IPC(8): H02M3/07H02H7/10H02M1/08
Inventor 戴晴华赵平华
Owner SANY HEAVY MACHINERY
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