JPH0360335A - Inverter - Google Patents

Abstract

PURPOSE:To simplify operation by selecting the one side of an inverter means or a storage battery means according to a result of discrimination at the time of using the inverter means and at the time of using a charging means. CONSTITUTION:When a storage battery B is connected to input terminals B1, B2, then a relay Ry1 is worked, and a contact SW10 is switched to a side (a), and the primary coil L1 of a transformer T is connected to a plug socket 13. The battery voltage is applied also to multivibrator IC1, and so oscillation occurs, and voltage is induced in the primary coil L1. When the storage battery B is removed from the input terminals B1, B2 and the non-charged battery B is connected to output terminals B3, B4, then the relay Ry1 and a converting section 1 are interrupted from the battery B by a diode D3, and the contact SW10 is returned to a slide (b), and a plug 12 is connected to the primary coil L1. By respective FETs 2, 3, half-wave rectification is to be performed, and so when an AC power source is connected to the plug 12, then transformer secondary-current is rectified, and the storage battery B is charged.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an inverter means for converting DC voltage from a storage battery into an AC voltage and outputting the same, and a charging means for rectifying the AC current and charging the storage battery. This invention relates to a selectable inverter.

[Conventional technology]

Conventionally, an inverter is equipped with an inverter unit that switches DC voltage from a storage battery of an automobile or the like, converts it into an AC voltage of, for example, 100V, and outputs it, and a charging unit that rectifies the AC current from an AC power source and charges the storage battery. It has been known.

FIGS. 5, 6(a) and 6(b) show an example of such an inverter, in which the inverter means and the charging means are switched using a changeover switch SW3. Note that FIG. 6(a) is a perspective view of the inverter as seen from the front, and FIG. 6(b) is a perspective view of the inverter as seen from the rear.

When converting the DC voltage from the storage battery B into an AC voltage and leading it to the outlet 13, first connect the storage battery B to the input terminal BIB2 arranged on the lower rear surface of the case 11, and set the changeover switch SW3 to the b side. Fold it down (as shown).

With this changeover switch SW3, from storage battery B to multi-I
Current is supplied to C1 and multi-IC1 starts oscillating. For this reason, the F connected to the Q and G outputs of multi-IC1
ET2.3 repeats turning on and off alternately, the current from storage battery B flows to the secondary coil L2 of the transformer T while reversing its direction, and an alternating current voltage is induced in the negative coil L1. This alternating current voltage is led to the outlet 13 via a switch 5W13 that is interlocked with the changeover switch SW3.

On the other hand, when rectifying the alternating current to charge the storage battery B, first connect the output terminal B3 disposed on the upper rear surface of the case 11.
．． After connecting the storage battery B to B4 and turning the changeover switch SW3 to the a side, the plug 12 is connected to an AC power source (not shown). This changeover switch SW3 disconnects the storage battery B from the multi-ICI, and keeps the FET 2.3 in the off state. Furthermore, the alternating current manually applied to the primary coil L1 via the switch 5W13 causes the secondary coil L2 to
A voltage is induced in A secondary current generated by this induced voltage flows between the sources and drains of FETs 2 and 3, is rectified, and is then supplied to storage battery B for charging.

[Problem to be solved by the invention]

However, in the above inverter, the changeover switch SW3 must be operated every time the inverter means and the charging means are switched, which is cumbersome to operate.

The present invention solves the above problems and aims to provide an inverter that is easy to operate.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an inverter that is selectably equipped with inverter means for converting the output of a storage battery into alternating current, and charging means for rectifying input from an alternating current power source and charging the storage battery. The apparatus has a determining means for determining when to use the inverter means and when to use the charging means, and selects either the inverter means or the charging means according to the result of the determination.

In the second aspect of the present invention, the determining means detects whether or not a storage battery is connected to the input terminal or the output terminal, and selects either the inverter means or the charging means depending on the connection state of the storage battery.

Furthermore, in a third aspect of the present invention, the discrimination means detects the battery voltage of the storage battery, and selects either the inverter means or the charging means depending on the battery voltage level.

Further, in a fourth aspect of the present invention, the discrimination means detects an alternating current voltage and selects either the inverter means or the charging means according to the alternating current voltage level.

[Effect]

According to the inverter with the above configuration, when it is determined that the inverter means is to be used, the output of the storage battery is converted to AC and output, and on the other hand, when it is determined that the charging means is to be used, the input from the AC power source is output. It is rectified and charged into a storage battery.

Furthermore, when the storage battery is connected to the input terminal, the output of the storage battery is converted to AC and output, while when the storage battery is connected to the output terminal, the human power from the AC power source is rectified and charged to the storage battery.

Further, when the battery voltage level of the storage battery is high, the output of the storage battery is converted to AC and outputted, whereas when the battery voltage level is low, the input from the AC power source is rectified and charged to the storage battery.

Furthermore, when the AC voltage level is low, the output of the storage battery is converted to AC and output, while when the AC voltage level is high, the input from the AC power source is rectified to DC and charged to the storage battery.

〔Example〕

A first embodiment of an inverter according to the present invention will be described using the circuit diagram of FIG.

The above inverter has an input terminal B1 as an inverter means.
, B2 switches the DC voltage of the storage battery B connected to B2 at a predetermined frequency, converts it to AC and outputs it, and also rectifies the human power from the AC power source as a charging means and outputs it to the output terminal B.
3. It is supplied to storage battery B connected to B4.

The multi-ICI of the converter 1 is connected in parallel to input terminals Bl and B2, and when a storage battery B is connected to these input terminals Bl and B2 and a DC voltage is applied, it oscillates at a frequency of, for example, 60 Hz. .

Note that when the Q output of the multi-IC 1 is high, the 0 output becomes low, and conversely, when the Q output is low, the 0 output becomes high.

The Q output of the multi-IC1 is input to the gate of the FET2 via the resistor R2, and when the Q output is high, the connection between the drain and the source is turned on. The 0 output of the multi-IC 1 is input to the gate of the FET 3 via the resistor R3, and when the 0 output is high, the connection between the drain and the source is turned on. Furthermore, when the gates of the FETs 2 and 3 are in an oven, the FETs 2 and 3 have a rectifying characteristic in which the forward direction is from the source to the drain.

The light emitting diode D2 turns off when the voltage of the storage battery B becomes lower than the Zener voltage of the Zener diode D1.
By turning off the light, a warning is given that the storage battery B is over-discharged.

The transformer T steps down the AC voltage applied to the primary coil L1 to a predetermined voltage and outputs it to the secondary coil L2, and when the AC voltage is applied to the secondary coil L2, steps it up to, for example, 100V. It is output to the primary coil L1.

Further, a plug 12 and an outlet 13 are connected to the negative side coil L1 via contact portions SW and O of the relay Ryl. The plug 12 is connected in parallel to the contact point of the contact portion 5W1o and the intermediate tap of the primary coil L1, and the outlet 13 is connected in parallel to the contact a of the contact portion 5w1g and one end of the primary coil L1. Further, the coil of the relay Ry1 is connected in parallel to the input terminals B1 and B2, and the coil of the relay Ry1 is connected in parallel to the input terminals B1. When the storage battery B is connected to B2, it is turned on and the contact portion 5W1o is switched from the b side to the a side (the state shown in the figure). By switching this contact portion 5W1), the output voltage to the outlet 13 (square wave described later) becomes equal to the effective value of the input voltage (sine wave) from the commercial power source input from the plug 12, and the FET2, The voltage rectified in step 3 becomes higher than the battery voltage of storage battery B to some extent. By making the rectified voltage higher than the battery voltage of storage battery B, charging time is effectively shortened.

When the storage battery B is connected to the input terminals B1 and B2, the diode D3 supplies current from the storage battery B to the center tap of the secondary coil L2 via the breaker SW2. When removed, Multi I
Current is prevented from flowing into C1. Breaker S
W2 protects the circuit by cutting off when a current exceeding the rating flows through the inverter.

Next, the operation of the first embodiment will be explained.

When the storage battery B is connected to the input terminals B1 and B2', it operates as an inverter means. That is, relay R
The battery voltage of storage battery B is applied to yt to turn it on, the contact portion 5W10 is switched from the b side to the a side, and the outlet 13 is connected to the primary coil L1 through the contact a.

Further, a battery voltage is applied from the storage battery B to the multi IC 1, and the multi IC 1 oscillates at, for example, 60 Hz. When the Q output of the multi-channel C1 is high (0 output is low), FET2 is turned on and FET3 is turned off, and the current from the storage battery B is transferred to the secondary coil L of the transformer T.
2 to the FET 2, and a voltage is induced in the negative side coil L1.

On the other hand, when the Q output of multi-C1 is inverted to low (0 output is high), FET2 is turned off and FE
T3 turns on, and the current from storage battery B flows to secondary coil L2.
The voltage flows through the FET 3, and a voltage having a polarity opposite to that when the Q output of the multi-IC 1 is high is induced in the negative side coil L1.

Therefore, an AC voltage synchronized with the oscillation output of the multi-IC1 is output to the negative side coil L1, and this output is transmitted to the relay R.
The signal is output to the outlet 13 via the contact section SW1g of yl.

Next, after the storage battery is removed from the input terminals Bl and B2, for example, the uncharged storage battery B is removed from the output terminal B3. When connected to B4, it operates as a charging means. That is, relay Ryl and converter 1 are cut off from storage battery B by diode D3.

Therefore, the relay Ryl is turned off, the contact part 5W10 returns from the a side to the b side, the plug 12 is connected to the primary coil L1 through the contact part, and the output of the multi-IC1 is opened, and the output of the FET 2゜3 is Each gate serves as an oven, and the FETs 2 and 3 are configured to allow current to flow only from the source to the drain.

Then, when the plug 12 is connected to an AC power source, a voltage is induced in the secondary coil L2. A current due to this induced voltage flows between the sources and drains of FETs 2 and 3 every half wave. That is, the secondary current is rectified and supplied to storage battery B as a charging current.

In this way, in the first embodiment, the storage battery B is connected to the input terminal B1.
．． B2 or output terminal B3. Depending on whether it is connected to B4, the inverter means and the charging means are automatically switched, and the connection between the plug 12 and the outlet 13 is switched by switching the tap of the negative side coil L1.

Next, a second embodiment of the inverter according to the present invention will be described using the circuit diagram of FIG. In addition, in the figure, the same reference numerals as in FIG. 1 indicate the same parts. The inverter of the second embodiment has the input terminal B1. B
2. In place of the output terminal B3°B4 and the diode D3, a connecting terminal B5°B8, voltage dividing resistors R4, R5, a transistor Q1, and a relay Ry2 having interlocking contact portions SW1, 5w11 are provided.

The above connection terminal B5. B is for connecting storage battery B. Voltage dividing resistors R4 and R5 divide the battery voltage of storage battery B. Then, the above divided voltage is the transistor Q
When the on-voltage exceeds 1, the transistor Q1 is turned on and the relay Ry2 is turned on. Relay R
When y2 is turned on, the contact portions SW1 and 5w11 are respectively switched from the b side to the a side. In addition,
The fully charged storage battery B is connected to the connection terminal B5. When connected to Be, the on-voltage of transistor Q1 is exceeded.

Next, the operation of the second embodiment will be explained.

First, in order to operate the inverter of the second embodiment as an inverter means, when fully charged storage battery B is connected to connection terminals 135 and 138, transistor Q1 is turned on, relay Ry2 is turned on, and contact portion sw1 .5w1
1 respectively switches from the b side to the a side (state shown)
. Therefore, the primary coil L1 and the outlet 13 are connected through the contact a of the contact portion 5W11. In addition, the battery voltage of the storage battery B is applied to the multilayer c1 through the contact a of the contact part SW1, and the oscillation output is sent from the Q and G outputs to the FET 2.3, and then passes through the negative side coil L1 to the outlet 13.
AC voltage is output.

On the other hand, connect the uncharged storage battery B to terminal B5. When connected to B6, the voltage between the terminals of this storage battery B is low, so the transistor Q1 is turned off and the contact SW1.5 of the relay Ry2 is turned off.
W11 each return to side b.

Therefore, the plug 12 is connected to the primary coil L1 through the contact hole of the contact portion 5w11. Also, multi-ICI
Power is not supplied to , the output of multi-IC1 becomes oven, and the gates of FETs 2 and 3 are also opened. When the plug 12 is connected to the AC power source, an induced voltage is generated in the secondary coil L2, and the current generated by this induced voltage is rectified by the FETs 2 and 3, and the storage battery B
flows as a charging current.

In this way, in the second embodiment, the input terminal B of the first embodiment is
j, B2 and output terminal B3. It can be configured with a connecting terminal E55.138 instead of B4, and the voltage between the terminals of storage battery B can be detected to automatically switch between the inverter means and the charging means.

Next, a third embodiment of the inverter according to the present invention will be described using the circuit diagram of FIG. 3. In addition, in the figure, the same reference numerals as in FIG. 2 indicate the same parts. In the inverter of the third embodiment, switching between the inverter means and the charging means is determined based on the AC voltage level of the transformer T instead of the battery voltage level of the storage battery B of the second embodiment.

That is, in the third embodiment, the voltage dividing resistors R4,
R5, a diode D3. in place of the transistor Q1 and the relay Ry2. D4, voltage dividing resistor Rfi.

R7, a resistor R8, a transistor Q2, a capacitor C1, and a relay Ry3 having interlocking contact portions 5W12 and 5W13.

The diode D3 rectifies the voltage between the terminals of the plug 12, that is, the voltage between the contact a of the contact portion 5W13 and the intermediate tap of the primary coil L1.
It rectifies the voltage between the contact a of W13 and the intermediate tap of the primary coil L1.

The capacitor C1 smoothes the rectified voltage. The voltage dividing resistors R9 and R7 divide the rectified and smoothed DC voltage. Then, when the above-mentioned divided voltage exceeds the on-voltage of transistor Q2, transistor Q
2 is turned on to turn on relay Ry3. When the relay Ry3 is turned on, the contact portion 5W12,
5w13 are respectively switched from the b side to the a side.

Resistor R8 is the coil of relay Ry3 and transistor Q
This is the second current limiting resistor.

Note that the voltage divided by the voltage dividing resistors Re and R7 exceeds the ON voltage of the transistor Q2 when the AC voltage (sine wave) from the AC power source is applied to the plug 12, while the AC voltage (square wave) is applied to the plug 12. When outputted from 13, it is set to be lower than the on-voltage of transistor Q2.

Next, the operation of the third embodiment will be explained.

First, in order to operate the inverter of the third embodiment as an inverter means, the storage battery B is connected to the connecting terminals 135 and f38.
Connect to. At this time, since no power is connected to the plug 12, no voltage is applied to the capacitor C1, the transistor Q2 is turned off, and the relay RFI is turned off.

Therefore, the contact portions 5W12 and 5W13 of relay Ry3 each remain on the b side (state shown in the figure), battery voltage is applied from storage battery B to multi-tc1, and oscillation output is sent from Q and O outputs to FETs 2 and 3. and -next side coil L1
AC voltage is output.

The waveform of this AC voltage is a square wave with an amplitude of V2, as shown by the dashed line A in FIG. amplitude v
Less than 1.

Therefore, as shown by the solid line E in FIG. 4(b), the square wave voltage v4 charged in the capacitor C1 via the diode D3 is smaller than the sine wave voltage v3 (-dotted chain line D), and the transistor Q2 does not turn on. In other words, the contact point of relay Ry3 remains on the b side, and the negative side coil L
AC voltage (square wave) is continuously output from 1.

On the other hand, the plug 12 is connected to an AC voltage (sine wave) from an AC power source.
When connected to , capacitor C1 is charged via diode D4. Then, when the voltage divided by the voltage dividing resistors R6 and R7 exceeds the on-voltage of the transistor Q2 and the transistor Q2 is turned on, the relay Rya is turned on and the contact portion 5W is turned on.
12 and 5W13 respectively switch from the b side to the a side.

Therefore, power is not supplied to the multi-IC1, the output of the multi-ICi becomes open, and the gates of the FETs 2 and 3 also become ovens. As a result, the secondary coil L
The current generated by the voltage induced in B is rectified and flows to storage battery B as a charging current.

In this manner, in the third embodiment, the AC voltage from the AC power source connected to the primary coil L1 is detected and the inverter means is automatically switched to the charging means.

〔Effect of the invention〕

The present invention can automatically determine and switch between using the inverter means and when using the charging means.

That is, the inverter means and the charging means can be automatically switched by simply connecting the storage battery to the input terminal or the output terminal, thereby simplifying the operation.

In addition, since the battery voltage level of the storage battery is detected and the inverter means and charging means are automatically switched, if the storage battery is fully charged, it will be automatically converted to AC and output without using a changeover switch. , if it is an uncharged storage battery,
Can be charged automatically.

Furthermore, since the AC voltage level is detected and the inverter means and charging means are switched, when the AC power source is not connected, the output of the storage battery is automatically converted to AC and output, and when the AC power source is connected, the output is automatically converted to AC. You can switch to charging automatically.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a first embodiment of an inverter according to the present invention, FIG. 2 is a circuit diagram of a second embodiment of an inverter according to the present invention, and FIG. 3 is a circuit diagram of a third embodiment of an inverter according to the present invention. 4(a) and (b) are diagrams for explaining the operation of the inverter of the third embodiment, FIG. 5 is a circuit diagram of a conventional inverter, and FIGS. 6(a) and (b). ) is a perspective view of a conventional inverter. 1... Conversion unit, 2. -3...FET, 4... Rectifying element, B... Storage battery, B1. B2...Input terminal, B
3. B4...output terminal, B5. B6... connection terminal,
D3...Diode, Ql, Q2...Transistor, R4, R5°Re, R7...Voltage dividing resistor, Ryl,
Ry2. Ry3...Ryre 9W1. SW Shu~5Wt
3...Contact part, T...Transformer.

Claims (1)

[Claims] 1. Inverter means for converting the output of the storage battery into alternating current;
In an inverter that is selectably equipped with a charging means for rectifying input from an AC power source and charging the storage battery, the inverter has a determining means for determining when to use the inverter means and when to use the charging means, An inverter characterized in that one of the inverter means and the charging means is selected depending on the determination result. 2. The determining means detects whether or not a storage battery is connected to the input terminal or the output terminal, and selects either the inverter means or the charging means depending on the connection state of the storage battery. 1. The inverter according to 1. 3. The inverter according to claim 1, wherein the determining means detects a battery voltage of a storage battery and selects either the inverter means or the charging means depending on the battery voltage level. 4. The inverter according to claim 1, wherein the determining means detects an alternating current voltage and selects either the inverter means or the charging means depending on the alternating current voltage level.