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Inverter generator

A technology of inverters and generators, applied in the direction of AC motor control, electrical components, irreversible DC power input conversion to AC power output, etc., can solve problems such as poor power factor, large inrush current, etc., and improve responsiveness , The effect of improving fuel consumption performance

Active Publication Date: 2012-07-04
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, among the loads connected to the inverter generator described in Patent Document 2, there are low power factor loads such as mercury lamps.
Such a load has a poor power factor before the current is stable, so the inrush current at startup is large, and the output of the engine is mostly overloaded.
As a result, there is a disadvantage that the number of low power factor loads that can be started at rated output is small compared to the case of driving after the current has stabilized

Method used

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Examples

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Embodiment 1

[0031] figure 1 It is a block diagram generally showing the inverter generator according to the first embodiment of the present invention.

[0032] exist figure 1 In the figure, reference numeral 10 denotes an inverter generator, and the generator 10 has a motor (internal combustion engine) 12 and has a rated output of about 2.6 kW (AC 100V, 26A). Engine 12 is an air-cooled engine and is a spark ignition type. Its throttle valve 12a utilizes a throttle motor (actuator) 12b made of a stepper motor to open and close, and utilizes a recoil starter (not shown) to open and close. start.

[0033] A circular stator (not shown) is fixed near the cylinder head of the engine 12, and a three-phase output winding (main phase) consisting of U phase, V phase, and W phase constituting the engine power generation unit 14 is wound around the stator. winding) 14a and three single-phase windings 14b, 14c, 14d.

[0034] A rotor (not shown) serving also as a flywheel of the motor 12 is dispose...

Embodiment 2

[0064] Figure 6 It is a flowchart showing the operation of the inverter generator according to the second embodiment of the present invention, more specifically, the operation of the CPU 40 thereof. The illustrated program is also executed in each control cycle (step size) defined by the carrier frequency.

[0065] It will be described below. Like the first embodiment, in S100 the voltage and current of the AC output from the inverter 26 are detected, in S102 the phase difference θ of the detected voltage and current is calculated, and in S104 based on the calculated The phase difference to calculate the power factor cosθ.

[0066] Then proceed to S106, and read the output voltage limit amount α. The output voltage limit amount α is in with Figure 6 The processing executed simultaneously in the flow chart is calculated as a negative value. This will be described later.

[0067] Then go to S108, judge whether the output voltage limiting amount α read out is zero, if it i...

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Abstract

The invention provides an inverter generator, which improving responsivity to engine speed control instead of calculating target rotating speed of the engine according to a estimation value of load power according to turn-on rate of thyristor and power factor. The inverter generator has an inverter, the engine includes an air damper controlled by an actuator, alternate current outputted by drivenof the engine is converted into direct current for temporary, and the inverter converting the direct current into an alternate current again and outputting the current to the load power. In the inverter generator, voltage and current supplied to the electrical load is detected (S10), a power factor is calculated from the detected voltage and the current (S12, S14), a power of the load is estimated from the detected current and the calculated power factor (S16). Then a desired speed of the engine is determined based on the estimated power of the load (S18), and the actuator is controlled such that an engine speed becomes equal to the desired engine speed (S20), thereby improving the response of engine speed control.

Description

technical field [0001] The present invention relates to an inverter generator, and more specifically relates to an inverter generator that has a generator driven by an engine and controls the rotational speed of the engine in accordance with load power. Background technique [0002] Such an inverter generator is well known, that is, the alternating current output from the generator driven by the engine is temporarily converted into direct current in a converter composed of a thyristor bridge, and the output voltage is converted according to the PWM signal (the PWM The signal is generated by using the reference sine wave and the carrier wave of the target output voltage waveform) to drive the switching element, thereby converting the direct current into an alternating current of a predetermined frequency (commercial frequency) and outputting it. As an example of this inverter generator, The techniques described in the following Patent Documents 1 and 2 are listed. [0003] I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06H02M5/22H02M7/48
Inventor 桥本省二室野井和文
Owner HONDA MOTOR CO LTD
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