JP3372107B2 - Secondary battery charging circuit and secondary battery type cleaner using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging circuit for a secondary battery and a secondary battery cleaner using the charging circuit.

[0002]

2. Description of the Related Art As a conventional secondary battery charging circuit, for example, there is one shown in FIG. The commercial power source 1 is connected via a plug 2 with a power source transformer 42 for stepping down to a power source voltage most suitable for charging the secondary battery 10. The rectifier circuit 3 for rectifying an AC voltage is connected to the secondary side terminal of the power transformer 42, the rectified output of the rectifier circuit 3 is smoothed by the smoothing circuit 43, and then the secondary battery 10 is supplied to the secondary battery 10 via the constant current circuit 45. It is given as a charging voltage. A well-known method for detecting the completion of charging is to detect the voltage increase rate of the secondary battery or the temperature increase rate of the secondary battery when charging is performed with a constant current. In the example of the drawing, a method of detecting the temperature rise rate of the secondary battery 10 by charging with a constant current is shown. Since this method detects the outer casing temperature of the secondary battery 10,
The thermistor 11 is attached to a battery case, and the rate of increase in resistance value due to the temperature of the thermistor 11 is detected. Therefore, the thermistor output is one input terminal of the A / D conversion input terminals of the control circuit 44 configured by a microcomputer. Has been entered in. And the thermistor output is always controlled by the control circuit 4.
The A / D conversion circuit of the microcomputer in FIG. 4 reads the data at regular intervals to calculate the rate of increase. Although the method of calculating the rate of increase is a well-known technique and will not be described with reference to the drawings, it is easy to read the voltage value generated in the resistance value of the thermistor 11 at regular time intervals and calculate the change amount of this voltage value. The rate of increase can be calculated. In FIG. 12, the power transformer 42 is used to step down the AC voltage of the commercial power source 1 to a voltage most suitable for charging. However, a method of lowering the voltage by a switching regulator, charging a commercial power source with a resistor in series, is used. There are ways to do it.

FIG. 13 is a flow chart for explaining the operation of detecting the completion of charging in the charging circuit. First, in order to start charging the secondary battery 10, the control circuit 44
Instructs the constant current circuit 45 to flow a predetermined rapid charging current (step 301). During the rapid charging, the control circuit 44 detects the temperature of the battery case at regular time intervals and calculates the temperature rise rate from the detected temperature (step 30).
2). If this temperature increase rate is below a certain value, rapid charging is continued. If the temperature rise rate is equal to or higher than the predetermined value, it is determined that the charging is almost completed, the quick charging is stopped, and the trickle charging is started (steps 303 and 304). Therefore, a signal is supplied to the constant current circuit 45 through the signal line 46 to make the current have a predetermined value suitable for trickle charging.
As described above, in the method of FIG. 13, the completion of quick charging is detected by the temperature increase rate. For example, in the case of a NiHM battery, the method of detecting the completion of quick charging by the temperature increase rate of the battery is accurate, but in the case of a NiCd battery, a method of detecting the voltage increase rate is known. The optimum method for detecting the completion of quick charging differs depending on the type of battery.

[0004]

In the charging circuit using the power transformer in the power supply unit as described above, the capacity of the power transformer increases as the capacity of the secondary battery increases, and the weight and volume increase significantly. Therefore, it is not suitable for household appliances such as secondary battery cleaners. Further, when a switching regulator is used for the power supply unit, if the capacity of the battery increases, the weight and shape of the switching regulator increase and the cost becomes very high, which is not suitable for household appliances. Furthermore, when a resistor is placed in series with a commercial power source to limit the current, the loss of the resistor becomes very large, and it is difficult to store it in a narrow space. If the power consumption of the device using the secondary battery is relatively small, that is, the voltage of the secondary battery is relatively low and the current capacity of the secondary battery is small, the power transformer of the charging circuit, the constant current circuit, etc. It can be made relatively small. However, as described above, when the power consumption of the secondary battery type cleaner or the like increases to about 500 W or more, the voltage of the secondary battery needs to be increased and the current capacity also increases. Therefore, a charging circuit having a large electric power capacity is required, and the conventional charging circuit has a large inconvenience in terms of size, weight and power loss.

Therefore, an object of the present invention is to provide a charging circuit for a secondary battery which is small, lightweight, inexpensive, has a small power loss, and can be stably charged, and a secondary battery cleaner using the charging circuit. .

[0006]

In order to solve the above-mentioned problems, a charging circuit for a secondary battery according to the present invention comprises, firstly, a rectifying circuit for rectifying an AC voltage into a pulsating voltage, and A pulsating current voltage detection circuit that detects the pulsating current voltage value that is output, and controls energization of the pulsating current voltage to the secondary battery when the pulsating current voltage value detected by the pulsating current voltage detection circuit is less than or equal to a predetermined value. The gist of the present invention is to have a charging control means for charging by means of charging.

Secondly, in the first structure, the battery voltage detection circuit for detecting the voltage of the secondary battery, and a predetermined voltage added to the battery voltage detected by the battery voltage detection circuit, the predetermined voltage. Value adding circuit, a comparator for comparing the voltage of a predetermined value output from the voltage adding circuit and the pulsating current voltage value detected by the pulsating voltage detecting circuit, and the result of the comparison by the comparator. The gist of the present invention is to have a switching element whose conduction state is controlled by a charging control circuit when the pulsating voltage value is a predetermined value or less.

Thirdly, in the above-mentioned second construction, the predetermined voltage value added by the voltage adding circuit is changed in accordance with the fluctuation of the AC voltage from the AC power supply. To do.

Fourthly, the gist of the second configuration is that a current limiting resistor for limiting a charging current to a required value is connected in series to the switching element.

Fifthly, the gist of the present invention is to have a secondary battery temperature rise rate detecting means for detecting the temperature rise rate of the secondary battery to judge completion of charging in the first or second configuration.

Sixthly, the gist of the present invention is that in the first or second configuration, a secondary battery voltage increase rate detecting means for detecting the voltage increase rate of the secondary battery to determine completion of charging is provided.

Seventhly, the gist of the present invention is that, in the first or second configuration, there is provided a current interruption means for interrupting the charging current path when a current more than a predetermined value flows as a charging current.

Eighth, the secondary battery type cleaner of the present invention is
A charging circuit for the first secondary battery is provided, and the suction fan is driven by a universal motor that can be driven by a DC voltage from the secondary battery charged by the charging circuit or an AC voltage from a commercial power source. The main point is to become.

Ninth, in the above eighth construction, a cleaner main body provided with the charging circuit for the secondary battery, the secondary battery and the universal motor, and a cleaner separable from the cleaner main body are connected to the commercial power source. A cord reel part for winding a cord to be connected, the universal motor is driven by a DC voltage from the secondary battery when used only in the cleaner body, and the cord reel part is attached to the cleaner body. In this case, the universal motor is driven by the AC voltage from the commercial power source, and the secondary battery is charged by the charging circuit of the secondary battery.

Tenthly, in the eighth structure, the secondary battery is arranged in a portion serving as an air passage leading to the suction fan, and a part of wind generated by the suction fan when the cleaner is driven is used as the secondary battery. The gist is that it is configured to cool.

[0016]

In the above structure, firstly, only when the pulsating voltage obtained by rectifying the AC voltage by the rectifying circuit is equal to or lower than a predetermined value, the pulsating voltage is controlled to be applied to the secondary battery for charging. Be seen. This makes it easy to adjust the current value of the charging current, eliminating the need for a power supply transformer or the like, which enables reduction in size and weight. Further, the power loss of the charging circuit is small, and the charging current becomes almost constant current, which enables stable charging.

Secondly, specifically, the battery voltage detection circuit detects the voltage of the secondary battery, and the voltage addition circuit adds a predetermined voltage to the battery voltage to create the predetermined value. In the comparator, the voltage of this predetermined value and the pulsating current voltage value are compared, and when the pulsating current voltage value is less than or equal to the predetermined value, the charging control circuit turns on the switching element to charge the secondary battery. . Thus, the charging current can be adjusted and the charging current can be made substantially constant without using a constant current circuit or the like.

Thirdly, by changing the predetermined voltage value added by the voltage adding circuit according to the fluctuation of the AC power supply voltage, the charging current becomes substantially constant even with the fluctuation of the AC power supply voltage. Stable charging is possible.

Fourthly, by connecting a current limiting resistor for limiting the charging current to a required value in series with a switching element for controlling the charging current ON / OFF, a fluctuation of the AC power supply voltage and a micro constituting the control circuit are formed. Variations in the charging current due to computer operation delays and the like are reduced, and stable charging is possible.

Fifth, constant current charging is performed, and in the case of a nickel hydrogen battery or the like, stable charging can be performed by detecting the temperature increase rate and determining completion of charging.

Sixth, in the case of a nickel cadmium battery or the like, constant current charging is performed, and stable charging can be performed by detecting the rate of voltage increase and determining completion of charging.

Seventh, when an excessive current flows in the secondary battery, for example, when the switching element is broken by energization,
For example, by preventing a continuous overcurrent to the secondary battery with a current interrupting means such as a temperature fuse, the secondary battery is prevented from being broken and safe charging is guaranteed.

Eighth, a secondary battery which is small in size and light in weight, has a charging circuit for a secondary battery with a small power loss due to a current limiting resistor, and can be operated by an alternating current from a commercial power source, and thus has excellent operability. Expression cleaner is realized.

Ninth, the cord reel portion for winding the cord connected to the commercial power source can be separated from the cleaner body,
When using only the cleaner body, it works with a secondary battery,
When the cord reel unit is attached to the cleaner body, it operates with AC from a commercial power source and the rechargeable battery is charged by the charging circuit, realizing a rechargeable battery cleaner with even easier operation. To be done.

Tenth, the secondary battery is arranged in a portion serving as an air passage leading to the suction fan, and is cooled by a part of the wind generated by the suction fan when the cleaner is driven, thereby improving the reliability of the secondary battery. It becomes possible.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views showing a first embodiment of the present invention. It should be noted that, in FIG. 1 and the drawings showing the respective embodiments to be described later, the same or equivalent components as the devices and elements in FIG.

The present embodiment shows a charging circuit applied when a secondary battery is used in a high power device. As shown in FIG. 1, the commercial power supply 1 is directly connected to the rectifier circuit 3. The output terminal of the rectifier circuit 3 is connected to the secondary battery 10 via the current limiter 4 and the switching element 8, and the AC voltage (for example, AC100V) from the commercial power source 1 is full-wave rectified by the rectifier circuit 3 to obtain a pulsating current voltage. Is used as the charging voltage of the secondary battery 10. Reference numeral 12 denotes a DC power supply circuit, which receives the full-wave rectified voltage as an input and generates a DC voltage for driving the control circuit 13. The DC power supply circuit 12 is the rectifier circuit 3
A diode is connected to the input portion of the input circuit so that the output waveform of the output is hardly affected. The control circuit 13 is composed of a microcomputer including a plurality of A / D converters. In the figure, a plurality of blocks having the respective functions described below are shown in the control circuit 13, but these are originally composed of software. First, in the control circuit 13, the secondary battery 10
A battery voltage detection circuit 14 for detecting the voltage is provided. The battery voltage detection circuit 14 is composed of an A / D converter of a microcomputer. The output terminal of the battery voltage detection circuit 14 is connected to the voltage addition circuit 16. The voltage adding circuit 16 adds a predetermined voltage to the detection voltage of the secondary battery 10 to obtain a predetermined value (cut voltage). On the other hand, the pulsating voltage value output from the rectifying circuit 3 is detected by the pulsating voltage detecting circuit 15. Then, the detected pulsating current voltage value and the predetermined value which is the output value of the voltage adding circuit 16 are compared by the comparator 17, the pulsating current voltage value is equal to or less than the predetermined value, and is calculated by the temperature rise rate calculating circuit 19. When the temperature rise rate determination circuit 20 determines that the charging is not completed based on the temperature rise rate of the secondary battery 10, the charging control circuit 18 as the charge control means controls the energization of the switching element 8. There is. The temperature rise rate calculation circuit 19 and the temperature rise rate determination circuit 20 described above constitute a secondary battery temperature rise rate detecting means. The thermistor 11 is embedded inside the plurality of secondary batteries 10, and the thermistor output is input to the temperature detection circuit 21. The temperature detection circuit 21 measures the temperature of the secondary battery 10 at regular intervals by the timer 22.
The output of the temperature detection circuit 21 is guided to the temperature increase rate calculation circuit 19 and the temperature increase rate of the secondary battery 10 is calculated. The method of calculating the temperature rise rate is performed by comparing two data before and after the temperature information detected by the timer 22 at regular intervals. It is well known that when a microcomputer is used, not only the instantaneous temperature rise rate but also an average temperature rise rate for a short period can be easily calculated to prevent an error. It is a technology. A trickle charging circuit 9 is connected to the switching element 8 in parallel. The trickle charging circuit 9 is a circuit that supplies a charging current having a value that can be continuously supplied to the secondary battery 10, and is on / off controlled by the control circuit 13.

FIG. 2 shows the configuration of the current limiter 4. The thermal fuse 5 and the current limiting resistor 6 as current interrupting means are connected in series, and both are physically integrated by the binder 7 so that the thermal fuse 5 receives the heat generated by the current limiting resistor 6. ing. 4a is a connection point. This structure operates effectively when the difference between the charging current and the abnormal current when the switching element 8 is completely conducted is relatively small. In the unlikely event that an excessive current flows through the secondary battery 10, the current limiting resistor 6 generates heat, and the temperature fuse 5 detects this heat generation and the temperature fuse 5 is melted and the secondary battery 10 is continuously connected. Overcurrent is prevented to prevent the secondary battery 10 from being destroyed by explosion or the like. In the present embodiment, the current limiter 4 has a structure in which a current limiting resistor and a temperature fuse are integrated, but when the difference between the charging current and the abnormal current when the switching element 8 is completely conducted is large. A current fuse or a fuse resistor may be used for this.

Next, the operation of the charging circuit configured as described above will be described with reference to the operation flowchart of FIG. 3 and the operation waveform diagram of FIG. Plug the charging circuit 2 into a commercial power source 1
When connected to, the reset circuit 23 resets all the functions of the control circuit 13. By this reset operation, the function of the control circuit 13 starts operating from the "beginning" portion. First, the trickle charging circuit 9 for continuing to supply the charging current having a value capable of being constantly energized to the secondary battery 10 is turned off (step 101). Battery voltage detection circuit 1 for quick charging
4 reads the voltage V _c of the secondary battery 10 (step 10
2), the voltage addition circuit to the secondary battery voltage V _c 16 adds the predetermined voltage, for example 5V and cut voltage V _cut the predetermined value (step 103). On the other hand, the pulsating voltage detection circuit 15 constantly monitors the value of the pulsating voltage V _a output from the rectifying circuit 3 (step 104). And V _a <
When the condition of V _cut is satisfied, a conduction signal is given to the switching element 8 to supply a charging current to the secondary battery 10 (No in step 105, 106). The control circuit 13 has V _a > V
_{When the cut} condition is satisfied, the switching element 8 operates so as to stop the charging current to the secondary battery 10 and becomes non-conductive (Yes in step 105, 107). FIG. 4B shows a charging current waveform. In this way, rapid charging is performed. When rapid charging progresses, the secondary battery 10
It is known that the battery outer peripheral temperature rises. The temperature detection circuit 21 detects the internal temperature of the secondary battery 10 incorporating a plurality of batteries (step 108). This temperature detection is performed by the timer 22 at regular time intervals. The temperature increase rate calculation circuit 19 calculates the temperature increase rate (dT / dt) from this fixed time interval and the two temperature data before and after (step 109). It is known that the rate of temperature increase rapidly increases when rapid charging progresses and charging is almost completed. The temperature rise rate determination circuit 20 determines whether the calculated temperature rise rate is equal to or higher than a predetermined value (step 110). Judgment result,
If the value is equal to or more than the predetermined value, a signal holding the state is output. This signal determines that the quick charging is completed, stops the quick charging, and shifts to trickle charging. In order to perform this operation, the charge control circuit 18 blocks the signal from the comparator 17 by the output of the temperature rise rate determination circuit 20. Further, the trickle charging circuit 9 is generated by the signal from the temperature rise rate determination circuit 20.
Is turned on (step 111). That is, when the rectifier circuit output V _a pulsating state is lower than the cut voltage V _cut,
The secondary battery 10 is charged, and a charging current as shown in FIG. 4B flows. Although it is rapidly charged by this charging current, when charging progresses and charging is almost completed, as shown in FIG.
As shown in (c), the temperature rise rate (dT / dt) of the battery rises rapidly. This temperature rise rate is a constant value (const2)
When the above is reached, the quick charging ends and trickle charging is performed.
Then, the charging is completed by a small value of the charging current that can be continuously supplied.

FIG. 5 shows an addition that creates a cut voltage V _cut for making the charging current to the secondary battery 10 a constant current when the commercial power supply voltage (pulsating voltage V _a ) and the battery voltage V _c fluctuate. It is a figure which shows the fluctuation | variation of the predetermined voltage value const1 which should be. As can be seen from this figure, it can be seen that it is more stable charging when varying the predetermined voltage value const1 to be added to the battery voltage V _c according to the fluctuation of the commercial power supply voltage (pulsating voltage V _a). FIG. 6 shows an operation flowchart in which the variable function of the predetermined voltage value is added. Control circuit 1
3 reads the battery voltage V _c and the power supply voltage (pulsating current voltage V _a ) respectively (steps 202 and 203), and obtains data from the battery voltage V _c and the maximum value of the power supply voltage (peak value of the pulsating current voltage V _a ). A table is drawn, and a predetermined voltage value const1 to be added is determined according to the data (step 204). The voltage adder circuit 16 uses the predetermined voltage value c
Onst1 is added to the battery voltage V _c to cut voltage V _cut
(Step 205). Other steps in the flowchart of FIG. 6 are almost the same as the corresponding steps in the flowchart of FIG. As described above, by making the rapid charging current constant, it becomes possible to perform stable charging and more accurately detect the completion of charging.

FIG. 7 shows the pulsating voltage and the power loss of the current limiting resistor 6 when the pulsating voltage V _a of this embodiment is cut at _a predetermined value (cut voltage V _cut ). The power loss of the current limiting resistor 6 when the charging current continues to flow without cutting V _a at a predetermined value (FIG. 7B) is shown. Both of them have resistance values of 2Ω (FIG. (A)) and 91Ω (FIG. (B) when a voltage V _c of the secondary battery 10 reaches 83V with a commercial power supply voltage of 100V and a charging current of about 0.36A flows. )) Is the result of calculation. As can be seen from FIG. 7B, when a continuous charging current is applied, the power loss of the current limiting resistor 6 is very large, and the power of the current limiting resistor 6 is changed by the fluctuation of the battery voltage and the commercial power supply voltage. Losses fluctuate very much. On the other hand, in the case of the present embodiment shown in FIG. 9A, the power loss of the current limiting resistor 6 is small, and the fluctuation of the power loss is relatively small with respect to the fluctuations of the battery voltage and the commercial power supply voltage. The features of secondary battery application equipment include small size and light weight, the power loss of the current limiting resistor is large inside the equipment body, and the increase in resistance or the structure for cooling the resistance is not accompanied. It goes without saying that it is unreasonable.

FIG. 8 shows a second embodiment of the present invention. In the first embodiment, the value of the temperature rise rate (dT / dt) of the secondary battery was used as the means for detecting the completion of charging. In the case of a nickel-hydrogen battery, it has been found that the method of detecting the completion of charging based on the temperature rise rate of the secondary battery when performing rapid charging at a constant current is accurate. However, in the case of the NiCd battery, it has been found that it is easy to detect the completion of charging by the voltage increase rate of the secondary battery. In this embodiment, the completion of charging is determined by detecting the voltage increase rate of the secondary battery. That is, the voltage of the secondary battery 10 is guided to the voltage detection circuit 26, and the voltage detection circuit 26 measures the voltage of the secondary battery 10 at regular time intervals by the timer 22. The output of the voltage detection circuit 26 is input to the voltage increase rate calculation circuit 24, and the voltage increase rate of the secondary battery 10 is calculated. The calculation method of the voltage increase rate is performed by comparing two data before and after the voltage information detected by the timer 22 at a constant time interval. Then, the voltage increase rate determination circuit 25 determines completion of charging based on the voltage increase rate of the secondary battery 10 calculated by the voltage increase rate calculation circuit 24. When the completion of charging is determined based on the rate of voltage rise of the secondary battery 10, the output of the rectifier circuit 3 may be smoothed to some extent to suppress short-term voltage fluctuations. This makes it possible to absorb the voltage fluctuation depending on the commercial frequency and stably determine the completion of charging of the secondary battery 10.

9 to 11 show examples of the structure of a secondary battery type cleaner using the secondary battery charging circuit described in each of the above embodiments. In FIG. 9, 27 is a cleaner body,
The cleaner body 27 is provided with a secondary battery 10, a charging circuit for the secondary battery 10, and a universal motor for driving the direct and dual drive for driving the suction fan. 29 is a hose. A cord reel portion 31 for winding a cord 32 connected to a commercial power source is provided at a lower portion of the cleaner body 27 so as to be separable from the cleaner body 27. The cleaner body 27 is also provided with a mounting detection switch 28 for detecting mounting of the cord reel section 31. Figure 1
Reference numeral 0 indicates the circuit configuration of the secondary battery cleaner. The commercial power source 1 is connected to a fixed contact a of the mounting detection switch 28 via a fuse 34 and a triac 35.
The other fixed contact b of the mounting detection switch 28 is the secondary battery 10
The movable contact c is connected to the universal motor 37 via the drive switch 36. The triac 35 is controlled by the cleaner control circuit 33. A charging circuit 30 for the secondary battery is configured in the cleaner control circuit 33. When the cord reel unit 31 is not mounted, the mounting detection switch 28 has the movable contact c connected to the fixed contact b, and the universal motor 37 is driven by the DC voltage from the secondary battery 10. When the cord reel unit 31 is mounted, the mounting detection switch 28 is switched to the fixed contact a, and the universal motor 37 is driven by the AC voltage from the commercial power supply 1. At this time, the AC voltage from the commercial power supply 1 is also supplied to the charging circuit 30 to charge the secondary battery 10. FIG. 11 shows a sectional structure of the cleaner body 27. The secondary battery 10 is arranged in a portion serving as an air passage leading to the suction fan 38. As a result, the secondary battery 10 is forcibly cooled by part of the suction air W generated by the suction fan 38 when the cleaner is driven. Reference numeral 39 is a cooling air suction hole, 40 is a paper bag, and 41 is a cushion. In the secondary battery cleaner of this embodiment, the commercial power source 1 and the secondary battery 10 are automatically switched and connected to the universal motor 37 depending on whether the cord reel portion 31 is attached or not attached.
It is safe and hassle-free and does not cause any erroneous operation. Further, during operation of the cleaner, the heat generated from the secondary battery 10 is forcibly radiated, so that the reliability of the secondary battery 10 is improved.

[0034]

As described above, according to the invention described in each claim, the following effects are obtained.

According to the rechargeable battery charging circuit of the first aspect, a rectifying circuit for rectifying an AC voltage into a pulsating voltage, and a pulsating voltage for detecting a pulsating voltage value output from the rectifying circuit. Since the detection circuit and the pulsating current voltage value detected by the pulsating current voltage detecting circuit are provided with a charging control unit that controls the energization of the pulsating current voltage to the secondary battery when the value is less than or equal to a comparison value to perform charging,
Since the current value of the charging current can be easily adjusted, a power transformer or the like becomes unnecessary, and it is possible to achieve small size, light weight, and low cost. Further, the power loss of the charging circuit is small, and the charging current becomes almost constant current, and stable charging can be performed.

According to the rechargeable battery charging circuit of the first aspect, a battery voltage detection circuit for detecting the voltage of the rechargeable battery and a predetermined voltage for the battery voltage detected by the battery voltage detection circuit. A voltage adding circuit for adding the comparison value to obtain the comparison value; a comparator for comparing the voltage of the comparison value output from the voltage adding circuit with the pulsating current voltage value detected by the pulsating current voltage detecting circuit; Comparison result of the device Since the pulsating voltage value is provided with a switching element that is controlled to be in the energized state by the charging control circuit when the value is less than or equal to the comparison value, a constant current circuit or the like is used together with facilitating adjustment of the charging current value. Even if the charging current is not provided, the charging current can be substantially constant.

In addition, according to the rechargeable battery charging circuit of the first aspect, the predetermined voltage value added by the voltage adding circuit is changed in magnitude according to the level of the AC voltage from the AC power supply. With this configuration, even if the AC power supply voltage fluctuates, the charging current becomes a substantially constant current, and more stable charging can be performed.

According to the secondary battery type cleaner of the second aspect, the charging circuit for the secondary battery of the first aspect is provided, and the DC voltage from the secondary battery charged by the charging circuit or from the commercial power source is used. Compact, because the suction fan is driven by a universal motor that can be driven by AC voltage
It is possible to realize a secondary battery type cleaner that is lightweight and has a charging circuit for a secondary battery that has a small power loss due to a current limiting resistor and that has excellent operability.

According to the secondary battery type cleaner of the third aspect, the rectifying circuit for rectifying the AC voltage into the pulsating voltage and the pulsating voltage detecting for detecting the pulsating voltage value output from the rectifying circuit. A circuit, a battery voltage detection circuit that detects the voltage of the secondary battery, a voltage addition circuit that adds a predetermined voltage to the battery voltage detected by the battery voltage detection circuit to obtain a comparison value, and the A means for changing the magnitude of the predetermined voltage value added by the voltage adding circuit according to the level of the alternating voltage;
A comparator that compares the voltage of the comparison value output from the voltage adding circuit with the pulsating current voltage value detected by the pulsating current voltage detecting circuit, and the pulsating current voltage value is the comparison result of the comparator. A charging control circuit having a switching element for charging the secondary battery, which is controlled to be in an energized state when it is less than or equal to a comparison value, and a secondary battery voltage increase for detecting completion of charging by detecting a voltage increase rate of the secondary battery. A secondary battery charging circuit having a rate detecting means is provided, and the secondary battery charged by the charging circuit is arranged in a portion that serves as an air passage leading to the suction fan. Since the secondary battery is cooled by the part, the reliability of the secondary battery, and thus the reliability of the secondary battery cleaner can be improved.

[0040]

[0041]

[0042]

[0043]

[0044]

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a charging circuit for a secondary battery according to the present invention.

FIG. 2 is a diagram showing a configuration example of a current limiter in the first embodiment.

FIG. 3 is a flow chart for explaining the operation of the first embodiment.

FIG. 4 is a waveform diagram of voltage, current, etc. of each part for explaining the operation of the first embodiment.

FIG. 5 is a diagram showing a predetermined voltage value to be added in order to generate a cut voltage with respect to fluctuations in a power supply voltage and a battery voltage in the first embodiment.

6 is a diagram showing an operation flowchart in which the variable function of the predetermined voltage value of FIG. 5 is added in the first embodiment.

FIG. 7 is a diagram showing a power loss of a current limiting resistor when a voltage obtained by cutting a pulsating current voltage by a predetermined value is used as a charging voltage in the first embodiment together with a comparative example.

FIG. 8 is a block diagram showing a second embodiment of the charging circuit for the secondary battery according to the present invention.

FIG. 9 is a side view showing an embodiment of a secondary battery type cleaner according to the present invention.

FIG. 10 is a block diagram showing an embodiment of the secondary battery cleaner.

FIG. 11 is a vertical sectional view showing an embodiment of the secondary battery type cleaner.

FIG. 12 is a block diagram showing a conventional secondary battery charging circuit.

FIG. 13 is a flowchart for explaining the operation of the above conventional example.

[Explanation of symbols]

1 Commercial Power Supply 3 Rectifier Circuit 4 Current Limiter 5 Temperature Fuse (Current Interrupting Means) 6 Current Limiting Resistor 8 Switching Element 9 Trickle Charge Circuit 10 Secondary Battery 13 Control Circuit 14 Battery Voltage Detection Circuit 15 Ripple Voltage Detection Circuit 16 Voltage Adder circuit 17 Comparator 18 Charging control circuit (charging control means) 19 Temperature rise rate calculation circuit 20 Temperature rise rate determination circuit (secondary battery temperature rise rate detection means) 21 Temperature detection circuit 24 Voltage rise rate calculation circuit 25 Voltage rise rate Judgment circuit (secondary battery voltage rise rate detection means) 26 Voltage detection circuit 27 Cleaner body 28 Mounting detection switch 31 Cord reel section 32 Code 37 Universal motor 38 Suction fan

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-59-162732 (JP, A) JP-A-6-14471 (JP, A) JP-A-5-192270 (JP, A) JP-A-5-162270 253096 (JP, A) JP 54-44732 (JP, A) JP 63-245235 (JP, A) Actually opened 64-47345 (JP, U) Actually opened 63-143259 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02J ⁷ /00-7/10 H01M 10/44 H02M 7/00

Claims (3)

(57) [Claims] 1. A rectifying circuit for rectifying an AC voltage into a pulsating voltage, a pulsating voltage detecting circuit for detecting a pulsating voltage value output from the rectifying circuit, and a battery for detecting a voltage of a secondary battery. A voltage detection circuit; a voltage addition circuit that adds a predetermined voltage value to the battery voltage detected by the battery voltage detection circuit to obtain a comparison value; and the voltage addition circuit according to the level of the AC voltage from the AC power supply. Means for varying the predetermined voltage value to be added in step S3, and a comparator for comparing the comparison value output from the voltage adding circuit with the pulsating current voltage value detected by the pulsating current voltage detecting circuit, A charging circuit for a secondary battery comprising a charging control circuit having a switching element for controlling the energization state when the pulsating voltage value is equal to or less than the comparison value as a comparison result of a comparator, and charging the secondary battery. . 2. A suction fan is provided by a universal motor which comprises the secondary battery charging circuit according to claim 1, and which can be driven by a DC voltage from the secondary battery charged by the charging circuit or an AC voltage from a commercial power source. A secondary battery type cleaner characterized by being configured to be driven. 3. A rectifying circuit for rectifying an AC voltage into a pulsating voltage, a pulsating voltage detecting circuit for detecting a pulsating voltage value output from the rectifying circuit, and a battery for detecting a voltage of a secondary battery. A voltage detection circuit, a voltage addition circuit that adds a predetermined voltage to the battery voltage detected by the battery voltage detection circuit to obtain a comparison value, and the voltage addition circuit according to the level of the AC voltage from the AC power supply. A means for changing the magnitude of the predetermined voltage value to be added, a comparator for comparing the voltage of the comparison value output from the voltage adding circuit and the pulsating voltage value detected by the pulsating voltage detecting circuit, As a comparison result of the comparator, when the pulsating current voltage value is less than or equal to the comparison value, the charging control circuit is controlled to be in the energized state, and has a switching element for charging the secondary battery; To detect the completion of charging A secondary battery charging circuit having a secondary battery voltage rise rate detecting means is provided, and the secondary battery charged by the charging circuit is arranged in a portion that serves as an air passage leading to the suction fan. A secondary battery cleaner characterized in that the secondary battery is configured to be cooled by a part of generated wind.