JPS61280720A - Power source unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (1) Industrial Field of Application The present invention relates to a power supply device (1) which uses an AC power source and a secondary battery such as a nickel-cadmium battery as a power source, and connects a load such as a lamp or a motor to this power source. Two people in charge.

The present invention relates to a load start-up control mechanism and a battery over-discharge prevention mechanism.

f) Conventional technology An example of a power supply device that uses an AC power supply and a secondary battery as a power source and a motor as a load is the Utility Model Application No. 59-1644.
There is a "battery charging circuit" disclosed in Japanese Patent No. 54. This technology operates a transistor inverter using the rectified voltage of the commercial power supply.

The battery is charged by the rectified current of the inverter output, and the reference voltage obtained from the rectified ITtt pressure,
A programmable unijunction transistor for comparing the battery voltage during non-charging between the γ node and the gate is inserted into the pace bias circuit of the oscillation transistor of the inverter, and the programmable φ unijunction transistor
A delay circuit consisting of a capacitor and a resistor is provided at the battery voltage detection terminal of the transistor, and a discharge switch interlocked with a load switch of the battery is provided between both ends of the capacitor. To l
! A motor is inserted through the t1 grip load switch.

In this technology, the opening and closing of the motor drive circuit is performed by a mechanical switch such as the load switch described above.1 For example, when the battery is over-discharged due to forgetting to turn off the switch, or the remaining capacity of the battery is insufficient to drive the motor. When there is no AC power supply (rectified output 1 of the inverter based on two sources;
Therefore, the motor cannot be driven, and the oscillation transistors that make up the inverter are destroyed, or even if not destroyed, the protective elements of the inverter circuit (e.g. fuse resistor) are blown, and the circuit operation of the power supply itself stops. There were problems such as: This is because in the case of a self-commutated inverter, when there is an overload or an output short circuit, the drive current cannot be supplied from the inverter transformer to the oscillation transistor (because the drive capacity limit is exceeded), and the inverter circuit stops oscillating. Or, the oscillation is disturbed and a direct current flows through the transistor, causing excessive power loss in the inverter circuit.
This kind of power loss was conspicuous in the battery, which worsened the starting characteristics of the motor when the battery was over-discharged.

(c) Problem to be solved by the invention The problem to be solved by the invention is to prevent over-discharge of the battery by using a transistor inverter circuit, a secondary battery, and a power supply C for starting the load. , and to develop a switch mechanism for controlling start-up of a load that can suppress power loss in the inverter circuit section.

2) Means for solving the problem: A transistor inverter circuit unit converts the DC output generated from the DC power source obtained by rectifying the commercial AC power source into AC≦=AC, and a rectifier to convert the AC output generated from the inverter circuit unit. A charging circuit that converts direct current (through it) and supplies it to a rechargeable secondary battery.

The charging circuit section includes a load connected to both ends of the battery via a transistor as a switching element, and the load is connected to either the DC output from the inverter circuit or the output of the battery. Activated by 1 = Next, a switch means for switching the conduction or non-conduction state of the switching element C2m and a self-holding circuit section for maintaining the conduction or non-conduction state of the switching element C2m are inserted between the battery and the load, When the battery is discharged (1), if the remaining capacity of the battery is below a predetermined value, the switching element maintains a non-conducting state and is supplied to the 6i load! I.J.
The battery is configured to cut off current from the secondary battery.

(E) Function When the secondary battery discharges and its remaining capacity drops to a predetermined value, the battery voltage also drops and the switching element connected in series with the load can no longer be maintained in a conductive state. is stopped and over-discharge of the battery is prevented.

Embodiment H The power supply device of the present invention will be explained in detail below along with the electric circuit of a dual-use electric shaver shown in the drawings.

(1) is a full-wave rectifier circuit D1, and its AC input terminal is connected to a commercial power supply Act (21) via a current fuse RF (3), and its DC output terminal 1 is connected to a reverse current blocking diode D2.
(4) and a series circuit of smoothing capacitor 01 (5) are connected via noise prevention coil L (6). (7) is a surge absorption capacitor ZNR, which is connected in parallel between the full-wave rectifier circuit D I [11 and the commercial power supply AC (21).

(8) is a transistor inverter (and one of the oscillation transformers T(9) is connected to both ends of the smoothing capacitor 01 (5)).
The next coil (11) and the collector-emitter of the oscillation transistor Q2 (111 and the thermal fuse TFa3.A series circuit of resistor R7 (131) are connected, and the resistor R7α
A capacitor o3 (141) is connected in parallel to the transistor Q21111, and a feedback coil L3 (LSI and a resistor B5 of the oscillation transformer T(9) is connected between the base and emitter of the transistor Q21111 via an automatic voltage switching control section αη. ing.

The automatic voltage switching control section a'n is the oscillation transistor Q2.
(A series circuit consisting of a resistor R1α connected to the base of Ill, the collector/emitter of a control transistor Q1α9, and a Zener diode ZD1 as a first reference voltage element, and a resistor connected to the feedback coil L3 A resistor R3 connected in parallel with the series circuit via Run.
H, Zener diode ZD as second reference voltage element
21231 and a series circuit consisting of a resistor R41241, i! The base of the control transistor Q1σ9 is connected to the Zener diode ZD2 (
231 and resistor R4 (connection point (R2) with 241 + 2 are connected.!Resistor R6Q5 and capacitor 02 (to) for absorbing high voltage are connected to both ends of the primary coil L1αC described in II.
series circuit is connected. In addition, the oscillation transformer T (8
)'s secondary coil L2@ is connected to the battery to be charged B (29) via a rectifier diode D3@.

ω is a motor M connected to both ends of the battery B@ via the collector and emitter of a transistor Q4CII+ as a switching element, and (to) a resistor R4C on the emitter side.
33) is connected to the positive electrode of the battery B@, and the collector side is connected to the base of the transistor Q4 ((n).
A lock switch S6 (to) is connected between the base of the transistor Q3 (to) and the negative electrode of the battery B (29). and a motor starting on switch S2 connected via a resistor B10@.And the off switch 81 (341 on switch S2c!
B constitutes a switching means side for controlling conduction/non-conduction of the three transistors Q4G.

The node 7 is connected to the battery B via a resistor R1214G.
Positive terminal I of
The cathode side of the battery B is connected to the negative electrode C of the battery B via a resistor I'113, and a capacitor 04 is inserted between the gate and the anode. (2) is the off switch 81 (the PUT I connected in parallel to 14);
@5 (D control resistor F19. @4 is the capacitor 0
A resistor R11 is connected in parallel to the capacitor 04 (4i5), and one end of the capacitor 04 (4i5 is connected to the pace of the transistor Q6).
(to) and Pt1r'rIN, the transistor Q4(
Configures the sword's conductive/non-conductive self-holding circuit. The motor Mω is driven by the rectified output of the secondary coil L2@ or by the electromotive force of the battery B (either by the electromotive force 29) when the on switch S2 is closed. Further, the rectified output of the secondary coil L2 (5) is supplied to the battery B2 even while the motor Mω is being driven, and the battery B (29) is floatingly charged.

Next, in (g), the series circuit of Zener diodes ZD5@ and ZD4 (Incorporated) as the fifth reference voltage element is connected to the full-wave rectifier circuit DI (11 DC output end of the resistor R8d and the A constant voltage is obtained across the Zener diode ZD4- by connecting it through the noise prevention coil L(6), and this voltage is applied to the resistor R16 and the resistor E11761).
The pressure is divided by R17A13 and 'R18@3. This voltage division point (R4) becomes the anode voltage of the progera i pull unit resistor PUT26J. Also, the gate of PU'I'264 is connected to the battery B12! through a resistor 'R15 (toward). Connected to the positive terminal of J and PU
The cathode of T2I54 is a light emitting diode LE for charging display.
It is connected to the base of the oscillation transistor Qll through Dtil to form a base bias circuit. Furthermore (
The resistor P17 is connected in parallel with the resistor R18 (to).
and R17A%, which is a temperature compensation diode D4 composed of three diodes connected to the battery B
The influence of the ambient temperature on the voltage of this diode D4v)
# distribution pressure point (R4
) to adjust the voltage.

In the power supply device having the above configuration, the full-wave rectifier D
The output of I (11 is smoothed by capacitor a1 (51) and connected to primary coil L1αω and feedback coil L3 (15
1, transistor Q2f11) conducts,
Secondary coil L2@l' knee induced current flows and battery B (2
9 is charged. The above “Battery B (2910
What is the battery voltage?

In order to detect the voltage in each half cycle of the input from the commercial power supply AOf21, from the base voltage of the pre-distribution pressure point (R4) connected to the base coil L3 (LS of 111 through PU by 2-) of the oscillation transistor Q2 (111). low, so when the voltage at the voltage dividing point (R4) is higher than the battery voltage, i.e. PUT2
(b) When the anode voltage is higher than the gate voltage, the PU
When T264 becomes conductive, the light emitting diode LED@ lights up to indicate charging, and a pace current flows through the oscillation transistor Q2 (111, causing the inverter circuit section (8) to oscillate. Once PUT2q5J becomes conductive, its holding current (
However, at the end of each cycle, the current drops below the holding current, so PUT2~ is cut off, and therefore the inverter circuit section (8) is activated every half cycle (
This oscillates.

When the charging progresses sufficiently and the battery voltage of the battery B (29) exceeds the reference voltage, the PUT 2 is cut off and the charging ends.

By the way, when the voltage of the commercial power source A O (2) changes, the voltage at the voltage division point (P2) of the automatic voltage switching control section (17) increases. The control transistor Q 1 (19 is the voltage C pace voltage of this voltage division point (P2)) is compared with the reference voltage of the Zener diode ZD1 (A), and when the base voltage increases, the conduction period of the control transistor 0.1119 becomes The conduction period of the transistor Q2 (Lll) is shortened because the conduction of the transistor Q2 (Lll) limits the current through the base of the one oscillation transistor Q2 (Lll). Control of the oscillation transistors Q2 (1, 11) by
keep.

The Zener diode ZD2 (23) enhances the voltage dividing effect of the voltage dividing circuit consisting of the resistors R5e23 and R424, and further reduces the output change of the inverter circuit section (8) with respect to the input electrical power (
It is something that decreases by two. That is, feedback coil L3 (L51
When the induced voltage increases, the voltage divided across the resistor R4 (241) is increased in proportion to the output of the inverter circuit section (8), and the emitter transistor q2111
conduction.

When the on switch S2 (to) is momentarily closed with the A/7 switch 83G13 closed, the gate voltage of PUT1 (to) decreases, so that PUT1 becomes conductive.

Then, a base current flows through the transistor Q6 (to), making the transistor Q3 (to) conductive, and this conduction is caused by the PU
Maintained by the self-holding properties of T1 brew. As the transistor Q3ω becomes conductive, the transistor Q4C111 becomes conductive, and a driving current is supplied from the secondary coil L2U and the battery B to the motor Mω, and the motor M starts driving.

When the motor M (to) is stopped, when the off switch S1 (to) is momentarily closed, the gate voltage of PUT 1 (391 rises to a value equal to the cand voltage of the PUT
1 (3) becomes non-conductive. At the same time, transistor Q3 becomes non-conductive and this state is maintained by PUTl-. Therefore, transistor Q4 (ID becomes non-conductive and the drive of motor M) stops. .

When the commercial power supply AO (21 is disconnected and the motor M (3G) is driven only by the electromotive force of the battery Bfi, the transistor Q4 (
11) When the capacity of battery B■ decreases and the battery voltage drops, the holding machine north of the self-holding circuit section stops working and becomes non-conductive, and the closed circuit between motor M■ and battery B@ is opened. Therefore, over-discharge of battery B@ is prevented. This is because the PUTl(39i) cannot activate its self-holding function unless the voltage exceeds a certain value, and as shown in the following (
: When the capacity of battery B@ falls to a predetermined value, motor Mω stops, and over-discharge of battery B is prevented. In case commercial power supply A
If the motor M (to) cannot be started even if C (2) is connected, the off switch 81 ( When 14 is closed, transistors Q3 and Q4 (b) on the side of PUT 1 become non-conductive, and the secondary current of transformer T (9) does not flow to motor M (3G, but entirely flows to battery Bc2g). Therefore, the battery voltage will recover quickly.

Next on switch 82c! The activation of motor Mω when B is closed becomes a reality.

With a conventional manual switch connected in series to the motor, if the battery is over-discharged and you connect the commercial power supply with the switch closed, most of the transformer's secondary current will flow to the battery and the motor will not rotate. do not. In this case, an excessive current flows to the primary side of the motor (motor) (no back electromotive force is generated and an excessive current flows to the primary side of the transformer, resulting in current leakage, etc.). However, in the present invention, when the battery over-discharges, the transistor Q
4 (to) becomes non-conductive and the motor Mω stops, so the above situation does not occur.

(G1) Effects of the Invention As described above, the present invention includes a transistor inverter circuit that converts DC output from a DC power supply into AC (2-AC), and converts the AC output from the inverter circuit into DC through a rectifier. and a load connected to both ends of the battery of the charging circuit via a switching element, the battery and the load being connected to each other. A switch means for switching the conduction or non-conduction state of the switching element and a self-holding circuit section for maintaining the conduction or non-conduction state are inserted between If the switching element is below a predetermined value, the switching element maintains a non-conducting state and cuts off the current from the secondary battery supplied to the load. It has the effect of preventing over-discharging of the battery and preventing damage to electrical circuit components that would otherwise occur when a load is operated with alternating current while the battery is over-discharged.

In addition, if you want to drive a load using alternating current when the battery capacity is just before overdischarge, the load will start immediately if you turn off the switching element, leave it for a few seconds, then turn it on again. ,′! ! This has the effect of improving the inconvenience that the load remains inactive and cannot be used while the battery is being charged.

[Brief explanation of the drawing]

The drawing is an electric circuit diagram of a dual-use electric shaver which is an embodiment of the power supply device of the present invention. (II... DC power supply, (8)... Inverter circuit section, ■... Rectifier, ■... Secondary battery, (Jll
-...Switching element, (3■...Load, 08)
...Switch means. Sir...Self-holding circuit section.

Claims (1)

[Claims] (1) a transistor inverter circuit unit that converts DC output from a DC power source; a charging circuit unit that converts the AC output from the inverter circuit unit into DC via a rectifier and supplies it to a rechargeable secondary battery; a load connected to both ends of the battery of the charging circuit unit via a switching element, and a switch between the battery and the load that switches the switching element between a conductive state and a non-conductive state. A means and a self-holding circuit section for maintaining the conducting or non-conducting state thereof are inserted, and when the remaining capacity of the battery is below a predetermined value when the battery is discharged, the switching element maintains the non-conducting state and the switching element maintains the non-conducting state, and the switching element maintains the non-conducting state to A power supply device characterized in that the current supplied from the secondary battery is cut off.