JP2001136670A - Charger and electric cleaner therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charger capable of performing charging control with high precision. SOLUTION: This charger is provided with a large-current charging circuit and a constant-current charging circuit constituted of a non-stabilized power supply, and is structured as an issue resolving means so as to charge a secondary battery 6 while performing switching between the circuits. It is thus possible to use parts with small rating, have a margin against temperature, relieve burden on a circuit element, facilitate detection of charging completion, and has an effect of capable of proper charging.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger for charging a secondary battery such as a nickel cadmium battery.

[0002]

2. Description of the Related Art The structure of a conventional charger will be described with reference to FIG.

The transformer includes a transformer 2 having a primary side connected to a commercial power supply 1, a diode bridge 8 connected to a secondary side of the transformer 2 for performing rectification, and a capacitor 4 for smoothing a current. The DC voltage generated by the action of the bridge 8 and the capacitor 4 is applied to the constant current circuit 5.
Is applied to the secondary battery 6 via the.
At this time, the voltage of the secondary battery 6 is measured by the voltage detecting means 7, and the charging current having the optimum magnitude is selected in accordance with the charge amount of the secondary battery 6 estimated from the transition, and the signal controlling means is selected. A signal is sent from 14 to the constant current circuit 5 so that a predetermined charging current is supplied to the secondary battery 6.

As shown in FIG. 5, a transformer 2 having a primary side connected to a commercial power supply 1 and a diode bridge 8 connected to a secondary side of the transformer 2 and performing a rectifying operation.
And a capacitor 4 for smoothing the current. The DC voltage generated by the action of the diode bridge 8 and the capacitor 4 is applied to the secondary battery 6.

There are the following methods for estimating the charged amount.

[0006] 1. -ΔV detection method: The peak of the battery voltage during charging is detected, and when the amount of decrease in the battery voltage from the peak −ΔV reaches the set value −ΔVx, it is estimated that the battery is fully charged.

[0007] 2. Temperature-controlled charging method: The battery temperature during charging is measured, and when the battery temperature T reaches a predetermined value or when the amount of decrease in T-ΔT reaches a predetermined value, it is estimated that the battery is fully charged.

[0008] 3. Timer method: The elapsed time from the start of charging is counted, and when a predetermined time has elapsed, it is estimated that the battery is fully charged.

[0009] When it is estimated that the battery is fully charged by the above-described method, in order to prevent the battery from being overcharged, a transition is made to trickle charging (charging with a current of about 1/10 of the normal charging current). Or end charging.

The above operation will be described with reference to FIG. still,
FIG. 6 is a flowchart of a charger using both the -ΔV detection method and the timer method.
The description is omitted because it is the same as the ΔV detection method.

At step 1, the timer starts counting when the secondary battery 6 is connected. At step 2, it is determined whether or not a predetermined time has elapsed. If not, in step 3, the peak value of the battery voltage from the start of charging to the current time is obtained.
If the current voltage value is not greater than the peak value, step 4
To compare the maximum value of the battery voltage with the current value.
If V is equal to or more than the set value-△ Vx, it is determined that the battery is fully charged, and the process proceeds to trickle charge. If V is less than-△ Vx, normal charge is performed. In step 5, it is determined whether or not the secondary battery 6 has been removed, and if removed, the timer is reset and charging is terminated.

[0012]

The peak of the battery voltage and -ΔV generally appear more remarkably as the charging current becomes larger, but it becomes expensive if a constant current circuit capable of flowing a large current is made. . In the conventional charger, since charging is performed with a relatively small current, the accuracy of -ΔV detection is low, and the charging time is relatively long. If a constant current circuit is not used in order to obtain a large current with an inexpensive circuit configuration, a very large current flows when the battery is discharged and the battery is empty, which places a burden on circuit elements and reduces the life of the circuit. When the battery is connected or the battery voltage becomes higher, the charging current becomes smaller, so that there has been a problem that the accuracy of -ΔV detection is deteriorated.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a charger for performing highly accurate charging control.

[0014]

In order to achieve the above object, the present invention comprises a large current charging circuit and a constant current charging circuit composed of an unstabilized power supply, and charges a secondary battery while switching between them. In this way, the battery can be charged stably.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION
It has a large-current charging circuit and a constant-current charging circuit composed of an unstabilized power supply. The burden on circuit elements is reduced, the end of charging can be easily detected, and proper charging can be performed.

According to a second aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. The current is smaller than the charging current of the high-current charging circuit to charge the rechargeable battery, allowing the use of parts with a low rating, allowing room for temperature, reducing the load on circuit elements, and completing charging. Detection is also easy, and proper charging is possible.

According to a third aspect of the present invention, there is provided a large current charging circuit composed of an unstabilized power supply and a constant current charging circuit for charging a secondary battery. Switching of the current charging circuit stabilizes the charging of the battery by turning on or off the large current charging circuit and the constant current charging circuit independently, or turning on or off by the combination of the large current charging circuit and the constant current charging circuit. Can be charged.

According to a fourth aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. A voltage detecting means for detecting a voltage and a voltage detecting means for detecting a voltage of the secondary battery are provided, and an on-period and an off-period of the large-current charging circuit and the constant-current charging circuit are switched by switching between the large-current charging circuit and the constant-current charging circuit. Is to determine the charge from the output of the voltage detection means for detecting the power supply voltage of the unstabilized power supply and the voltage detection means for detecting the voltage of the secondary battery, and to control the charge. In addition, charging can be performed according to the state of charge of the battery, and stable charging can be performed.

According to a fifth aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. A voltage detecting means for detecting a voltage and a voltage detecting means for detecting a voltage of the secondary battery are provided, and an on-period and an off-period of a large current charging circuit and a constant current charging circuit are switched by switching between a constant voltage charging circuit and a constant current charging circuit. Is determined to be a predetermined charging current, and can stabilize the charging current and improve the charging life of the battery.

According to a sixth aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. A voltage detecting means for detecting a voltage is provided, and when the detected power supply voltage is higher than a first predetermined voltage or lower than a second predetermined voltage, charging is performed only by a constant current charging circuit. The current can be stabilized and the charge life of the battery can be improved.

According to a seventh aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. A voltage detecting means for detecting a voltage is provided to detect a power supply voltage after a charging current reaches a predetermined value, thereby increasing the accuracy of power supply voltage detection and stabilizing charging of a battery. be able to.

The invention according to claim 8 of the present invention comprises a large current charging circuit and a constant current charging circuit constituted by an unstabilized power supply, and charges a secondary battery. Voltage detection means for detecting the voltage is provided, and when the power supply voltage is detected, the constant voltage charging circuit is turned off, and furthermore, the constant current circuit is also turned off to detect the power supply voltage, thereby improving the detection accuracy of the power supply voltage. The battery can be charged stably.

According to a ninth aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. Voltage detection means for detecting the voltage is provided, and when the power supply voltage is detected, only the constant current charging circuit is turned on to detect the power supply voltage, thereby improving the detection accuracy of the power supply voltage and stabilizing the charging of the battery. It can be charged.

According to a tenth aspect of the present invention, the battery charger according to any one of the first to ninth aspects is capable of charging a plurality of batteries. Battery can be recharged, and the time required for recharging can be omitted, making it easy to use.

According to an eleventh aspect of the present invention, a vacuum cleaner provided with the charger according to any one of the first to tenth aspects eliminates the need for a commercial power cord during cleaning. It is possible to perform cleaning without worrying about the power cord, and it is possible to provide a vacuum cleaner with greatly improved usability.

[0026]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

A transformer 2 having a primary side connected to a commercial power supply 1, a diode 3 connected to a secondary side of the transformer 2 for rectifying operation, and a capacitor 4 for smoothing a voltage are provided. And the DC voltage generated by the action of the capacitor 4 is connected to the constant current circuit 5 and the first ON / O
It is configured to be applied to the secondary battery 6 via the FF means 7. A diode bridge 8 for performing a rectification operation between a middle point and an end point of the secondary side of the transformer 2; and a capacitor 9 for smoothing a voltage. A DC voltage generated by the action of the diode bridge 8 and the capacitor 9 is provided. Is applied to the secondary battery 6 via the second ON / OFF means 10. Reference numeral 11 denotes a battery voltage detecting means for measuring the voltage of the secondary battery 6, and reference numeral 12 denotes a control means for selectively controlling the first ON / OFF means 7 and the second ON / OFF means 10.

Regarding the setting of the charging current, the first ON /
The charging current at the constant current and the second ON / OF by the OFF means 7
In the charging current in the F means 10, the first ON / OFF means 7
The constant current side in (1) reduces the charging current.

The first ON / OFF means 7 and the second ON / OFF
There are various methods for switching the OFF means 10, but the first ON / OFF means 7 is ON or OFF alone, the second ON / OFF means 10 is ON or OFF alone,
First ON / OFF means 7 and second ON / OFF means 1
ON or OFF can be realized alternately with 0, and the actual charging current can be made substantially constant current by freely setting the ON period OFF.

The operation and operation according to the above configuration are as follows.

When the secondary battery 6 is connected, since the battery voltage is low at first, the voltage detected by the battery voltage detecting means 11 is low, and the control means 12 selects the first ON / OFF means 7 and starts charging. When the voltage of the secondary battery 6 rises and reaches a predetermined voltage, the control means 12 controls the second ON / OFF means 10
Select to continue charging. Here, the second ON / OFF
When charging is performed by the means 10, the charging current is determined by the output voltage on the secondary side of the transformer 2 and the voltage of the secondary battery 6, and when the battery voltage is low, the charging current increases and the second ON / OFF The OFF means 10 must have a large rating. In addition, when the current is large, the temperature of components such as the transformer 2 also increases, leading to a reduction in the life of the circuit. In addition, when charging the secondary battery 6, when the charging current is large at the end of charging, the battery voltage rises, then falls and then shows a peak voltage tendency. Therefore, it becomes easy to detect the peak, it is easy to determine the end of charging, and to end the charging. Therefore, as shown in FIG.
When the secondary battery 6 is charged with a constant current by the N / OFF means 7 and reaches a predetermined voltage V, the control means 12 charges the secondary battery 6 with the second ON / OFF means 10 at a large current. In addition, it is possible to use components with a small rating, to have a margin for temperature, to reduce the load on circuit elements, to easily detect the end of charging, and to carry out proper charging.

Next, another embodiment of the present invention will be described with reference to FIG. Components having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

A transformer 2 having a primary side connected to a commercial power supply 1, a diode 3 connected to the secondary side of the transformer 2 for rectifying operation, and a capacitor 4 for smoothing a voltage. And the DC voltage generated by the action of the capacitor 4 is connected to the constant current circuit 5 and the first ON / O
It is configured to be applied to the secondary battery 6 via the FF means 7. A diode bridge 8 for performing a rectification operation between a middle point and an end point of the secondary side of the transformer 2; and a capacitor 9 for smoothing a voltage. A DC voltage generated by the action of the diode bridge 8 and the capacitor 9 is provided. Is applied to the secondary battery 6 via the second ON / OFF means 10. 11 is a battery voltage detecting means for measuring the voltage of the secondary battery 6, 12 is a control means for selectively controlling the first ON / OFF means 7 and the second ON / OFF means 10, and 13 is a secondary side of the transformer 2. Power supply voltage detecting means for detecting the voltage of the cathode portion of the diode 3 of FIG.

The operation and operation of the above configuration are as follows.

If the power supply voltage of the commercial power supply 1 is high, the output of the transformer 2 increases, the output of the diode bridge 8 also increases, and the difference from the secondary battery 6 increases. In this case, the charging current increases, and the load on the second ON / OFF means 10 increases. Further, when the power supply voltage is low, the output of the transformer 2 is reduced, the output of the diode bridge 8 is also reduced, and the difference from the secondary battery 6 is reduced.
When charging is performed by the means 10, the charging current becomes small and charging cannot be performed. Therefore, when the power supply voltage is high or low, the second ON / OFF means 10 does not charge and the first O
Only charging with a constant current is performed by the N / OFF means 7. Stable charging is possible without increasing the load on circuit elements.

Further, based on the power supply voltage and the voltage of the secondary battery 6, the first ON / OFF means 7 and the second ON / OFF
If the means 10 is appropriately switched, more stable charging can be achieved.

When charging the secondary battery 6, the load current on the secondary side of the transformer 2 changes due to the difference in charging current, and the voltage also changes. Then, the voltage detected by the power supply voltage detecting means 13 is deviated. Therefore, when the power supply voltage is detected by the power supply voltage detecting means 13, the detection accuracy of the power supply voltage is improved by setting the first ON / OFF means 7 to the constant current charging state. When the power supply voltage detecting means 13 detects the power supply voltage, the first ON /
When the OFF means 7 is in the OFF state or the second ON / OFF means 1
When the switch 2 is in the OFF state, the load current of the transformer 2 is small, and the detection accuracy of the power supply voltage is further improved.

Although the above description has been made with reference to a single secondary battery 6, the present invention has a plurality of the above-described configurations, so that the secondary battery 6 can be used.
Can be charged, and another battery can be charged when one battery is used. Therefore, the battery charger is very convenient without any waiting time during charging.

Furthermore, the vacuum cleaner having this charger does not require a power cord at the time of cleaning, and can be cleaned without worrying about the cord, which is convenient.

[0040]

According to the first aspect of the present invention,
Equipped with a large-current charging circuit and a constant-current charging circuit composed of an unstabilized power supply, and charging the secondary battery while switching between them allows the use of components with low ratings and provides a margin for temperature. This has the effect of reducing the load on the circuit elements, easily detecting the end of charging, and enabling proper charging.

According to a second aspect of the present invention, there is provided a large current charging circuit composed of an unstabilized power supply and a constant current charging circuit for charging a secondary battery. Since the current is smaller than the charging current of the constant voltage charging circuit and the secondary battery is charged, parts with a low rating can be used, there is room for temperature, and the burden on circuit elements is reduced, It is easy to detect the end of charging, and there is an effect that proper charging can be performed.

According to a third aspect of the present invention, there is provided a large current charging circuit composed of an unstabilized power supply and a constant current charging circuit for charging a secondary battery. Switching of the current charging circuit stabilizes the charging of the battery by turning on or off the large current charging circuit and the constant current charging circuit independently, or turning on or off by the combination of the large current charging circuit and the constant current charging circuit. Can be charged.

According to a fourth aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. A voltage detecting means for detecting a voltage and a voltage detecting means for detecting a voltage of the secondary battery are provided, and an on-period and an off-period of the large-current charging circuit and the constant-current charging circuit are switched by switching between the large-current charging circuit and the constant-current charging circuit. Is to determine the charge from the output of the voltage detection means for detecting the power supply voltage of the unstabilized power supply and the voltage detection means for detecting the voltage of the secondary battery, and to control the charge. In addition, charging can be performed according to the state of charge of the battery, and stable charging can be performed.

According to a fifth aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. A voltage detecting means for detecting a voltage and a voltage detecting means for detecting a voltage of the secondary battery are provided, and an on-period and an off-period of a large current charging circuit and a constant current charging circuit are switched by switching between a constant voltage charging circuit and a constant current charging circuit. Is determined to be a predetermined charging current, and can stabilize the charging current and improve the charging life of the battery.

The invention according to claim 6 of the present invention comprises a large current charging circuit and a constant current charging circuit constituted by an unstabilized power supply, and charges a secondary battery. A voltage detecting means for detecting a voltage is provided, and when the detected power supply voltage is higher than a first predetermined voltage or lower than a second predetermined voltage, charging is performed only by a constant current charging circuit. The current can be stabilized and the charge life of the battery can be improved.

According to a seventh aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. A voltage detecting means for detecting a voltage is provided to detect a power supply voltage after a charging current reaches a predetermined value, thereby increasing the accuracy of power supply voltage detection and stabilizing charging of a battery. be able to.

According to an eighth aspect of the present invention, there is provided a large current charging circuit and a constant current charging circuit composed of an unstabilized power supply, for charging a secondary battery. Voltage detection means for detecting the voltage is provided, and when the power supply voltage is detected, the constant voltage charging circuit is turned off, and furthermore, the constant current circuit is also turned off to detect the power supply voltage, thereby improving the detection accuracy of the power supply voltage. The battery can be charged stably.

According to a ninth aspect of the present invention, there is provided a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery. Voltage detection means for detecting the voltage is provided, and when the power supply voltage is detected, only the constant current charging circuit is turned on to detect the power supply voltage, thereby improving the detection accuracy of the power supply voltage and stabilizing the charging of the battery. It can be charged.

According to a tenth aspect of the present invention, the battery charger according to any one of the first to ninth aspects is capable of charging a plurality of batteries. Battery can be recharged, and the time required for recharging can be omitted, making it easy to use.

According to an eleventh aspect of the present invention, a vacuum cleaner provided with the charger according to any one of the first to tenth aspects eliminates the need for a commercial power supply cord during cleaning. It is possible to perform cleaning without worrying about the power cord, and it is possible to provide a vacuum cleaner with greatly improved usability.

[Brief description of the drawings]

FIG. 1 is a block diagram of a charger showing a first embodiment of the present invention.

FIG. 2 is a charging characteristic diagram of the charger.

FIG. 3 is a block diagram of a charger showing another embodiment of the present invention.

FIG. 4 is a block diagram of a conventional charger.

FIG. 5 is a block diagram of another example of a conventional charger.

FIG. 6 is a flowchart of a main part of the charger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Transformer 5 Constant current circuit 6 Secondary battery 7 First ON / OFF means 10 Second ON / OFF means 11 Battery voltage detecting means 12 Control means 13 Power supply voltage detecting means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B057 DE03 DE05 5G003 AA03 BA01 CA02 CA17 CC07 5H030 AA02 AA03 AS11 AS18 BB03 BB04 BB09 DD20 FF43 FF52

Claims (11)

[Claims] 1. A battery charger comprising a large-current charging circuit and a constant-current charging circuit each composed of an unstabilized power supply, and charging a secondary battery while switching between them. 2. A charging device for a secondary battery, comprising: a large current charging circuit composed of an unstabilized power supply; and a constant current charging circuit, wherein the charging current of the constant current charging circuit is the charging current of the large current charging circuit. The charger of claim 1 that is smaller. 3. A high-current charging circuit comprising a non-stabilized power supply and a constant-current charging circuit for charging a secondary battery, wherein switching between the high-current charging circuit and the constant-current charging circuit is performed by high-current charging. 2. The charger according to claim 1, wherein the charger and the constant current charging circuit are individually turned on or off, or the combination of a large current charging circuit and a constant current charging circuit is turned on or off. 4. A voltage detecting means, comprising: a large current charging circuit constituted by an unstabilized power supply; and a constant current charging circuit, for charging a secondary battery. Voltage detecting means for detecting the voltage of the next battery, and switching between the large-current charging circuit and the constant-current charging circuit, the on-period and the off-period of the large-current charging circuit and the constant-current charging circuit are controlled by the power supply voltage of the unstabilized power supply. 4. The battery charger according to claim 3, wherein the charging control is performed by determining the output from the voltage detecting means for detecting the voltage and the output of the voltage detecting means for detecting the voltage of the secondary battery. 5. A voltage detecting means, comprising: a large current charging circuit composed of an unstabilized power supply; and a constant current charging circuit, for charging a secondary battery, and a voltage detecting means for detecting a power supply voltage of the unstabilized power supply. Voltage detecting means for detecting the voltage of the secondary battery is provided, and the on-period and off-period of the large-current charging circuit and the constant-current charging circuit are switched to a predetermined charging current by switching between the large-current charging circuit and the constant-current charging circuit. 5. The charger according to claim 4, which determines. 6. A high-current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery, and a voltage detecting means for detecting a power supply voltage of the non-stabilized power supply is provided. 5. The charger according to claim 4, wherein when the detected power supply voltage is higher than the first predetermined voltage or lower than the second predetermined voltage, the charging is performed only by the constant current charging circuit. 7. A high-current charging circuit comprising a non-stabilized power supply and a constant current charging circuit for charging a secondary battery, and a voltage detecting means for detecting a power supply voltage of the non-stabilized power supply is provided. 5. The battery charger according to claim 4, wherein the power supply voltage is detected after the charging current has reached a predetermined value. 8. A voltage detecting means for charging a secondary battery, comprising: a large current charging circuit comprising a non-stabilized power supply; and a constant current charging circuit, wherein voltage detecting means for detecting a power supply voltage of the non-stabilized power supply is provided. 5. The charger according to claim 4, wherein when detecting the power supply voltage, the large current charging circuit is turned off, and the constant current circuit is also turned off to detect the power supply voltage. 9. A voltage detecting means for charging a secondary battery, comprising: a large current charging circuit comprising a non-stabilized power supply and a constant current charging circuit; and a voltage detecting means for detecting a power supply voltage of the non-stabilized power supply. 5. The charger according to claim 4, wherein when the power supply voltage is detected, only the constant current charging circuit is turned on to detect the power supply voltage. 10. A battery capable of charging a plurality of batteries.
The charger according to any one of claims 1 to 4. 11. A vacuum cleaner provided with the charger according to claim 1.