JP2001112188A - Electrical equipped with measures against power failure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To omit the adjustment of a tap by a user regarding a transformer which is used in common at standby and when a power supply is turned on, in an audio apparatus equipped with measures against a power failure according to the rated voltage of a commercial AC power supply by country. SOLUTION: According to the rated voltage by countries, a user changes over only the tap 33 of a transformer 29 used exclusively, when a power supply is turned on. Both ends of the secondary coil 31 of the transformer 29 are supplied to a series circuit by resistances 48, 49 via diodes 46, 47. The connecting point of the resistances 48, 49 is set at a voltage V1, so as to be connected to an electrolytic capacitor 42 via a diode 55 and a resistance 54. The connecting point of the resistance 54 and the diode 55 is set at a voltage V2. When a power failure is not generated, the secondary voltage of the secondary coil 31 is sufficiently high, the diode 55 is turned off, and V2>=Vr. While when the power failure is generated, the diode 55 is turned on, the voltage V2 is lowered by the dropped voltage portion of the resistance 54, and V2<Vr. A detection part 57 sends to a microcomputer 22 an output, based on the compared result of V2 with Vr.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device with a power failure countermeasure applied to audio equipment and the like, and more particularly, to an electric device with a power failure countermeasure capable of simplifying tap adjustment in each country having different rated voltages. .

[0002]

2. Description of the Related Art In an audio device, a microcomputer is operated even when a power-on instruction is being waited for to receive a power-on signal from a wireless remote controller and wait for a power-on instruction by a manual operation of a power instruction key or the like in the audio device body. Then, with the power-on instruction,
The power switch relay is switched from off to on so that each first DC element is operated together with the microcomputer. Then, in order to operate the microcomputer even during the standby of the power-on instruction, to the secondary side of the first transformer that operates even during the standby of the power-on instruction,
A first constant voltage generator for power generation of the microcomputer is connected, and a second transformer operated with a power switch relay on to operate each first DC electric element during power-on. A second constant voltage generator for generating power of the first DC electrical element is connected to the secondary side of the unit. Furthermore, in the case of audio equipment with power outage countermeasures, in order to have the microcomputer perform protection processing during a power outage,
A power failure detection means is provided.

[0003]

The rated voltage of a commercial AC power supply is 100 V in Japan, whereas it is 100 V in China.
It is 110-120V, 120V in the United States, 220-240V in Europe and Australia, and varies from country to country. In audio equipment with power outage countermeasures generally considered, the main amplifier that directly supplies the secondary current of the transformer without passing through the constant voltage generation circuit is connected to the secondary side of the second transformer, and the power outage detecting means is the A power outage is detected based on the voltage on the secondary side of one transformer. The main amplifier must adjust the input voltage to a constant value. Further, the power failure detection means compares the voltage at a predetermined location with a predetermined reference voltage,
A power failure of the commercial AC power supply is detected, and if the rated voltage of the commercial AC power supply is different, the voltage at the predetermined location during a non-power failure changes.Therefore, in order for the power failure detection means to detect the power failure without any trouble, It must be adjusted so that the voltage at the predetermined location at the time of a power failure is constant irrespective of the rated voltage of the commercial AC power supply. Therefore, regardless of various rated voltages, in order to properly operate the main amplifier and the power failure detection means, both the first and second transformers are tapped, and the user can use different rated voltages of the commercial AC power supply. For each country, taps must be adjusted in both transformers to adjust the secondary voltage, which is troublesome for the user.

[0004] It is an object of the present invention to provide an electric device with a power failure countermeasure that overcomes the above-mentioned problems.

[0005]

According to the electric device with power outage countermeasure of the present invention, while the power-on instruction is on standby, the microcomputer is operated to turn on the power from the wireless remote controller. Waits for a signal reception and a power-on instruction by manual operation of the power instruction operation unit in the electric device body, and switches the commercial AC power supply switch (26) from off to on in accordance with the power-on instruction. Then, together with the microcomputer (22), each first DC electric element (66) is operated.
The electric equipment with power outage countermeasures (10) has the following. During the power-on instruction standby and during power-on, both of the tapless transformer (12) to which the commercial AC power is input to the primary side and charged by the rectified current of the secondary current of the tapless transformer (12). Capacitor (19) A first constant voltage generator (20) for generating a first constant voltage from the voltage of the first capacitor (19) The commercial AC power is input to the primary side only during power-on, and the user inputs the commercial AC power. The transformer with tap is adapted to adjust the secondary voltage to a predetermined value by switching the tap in relation to the rated voltage of the transformer (29) .It is charged by the rectified current of the secondary current of the transformer with tap (29). The second capacitor (39) generates a second constant voltage from the voltage of the second capacitor (39) and supplies a second constant voltage to each of the first DC electric elements (66). Generator (40) Current obtained by rectifying the secondary current of the tapped transformer (29) without going through the constant voltage generator A second direct current electrical element (67) which operates upon receipt of the supply, the second capacitor (39) and the first capacitor (39) being directed in a forward direction from the second capacitor (39) to the first capacitor (19); 19), the input voltage of the first constant voltage generator (20) is set to a voltage at which the first constant voltage generator (20) can generate the constant voltage (hereinafter referred to as “operation guaranteed minimum input voltage”). The diode (41) which conducts before dropping to below the first constant voltage generator (20) to ensure the input voltage of the first constant voltage generator (20) is equal to or higher than the operation-guaranteed minimum input voltage. Power failure detection means (57) that detects a power failure of the commercial AC power supply from the secondary voltage and outputs the detection result to the microcomputer (22)

[0006] The electrical equipment (10) with power outage countermeasures includes audio equipment such as audio components, video equipment, and f.
In order to cope with a power failure, such as an ax machine, it is necessary to include any electrical equipment that needs to monitor the power failure during power-on.

[0007] The first DC electric element (66) includes, for example, a module, an IC, and the like, which are provided in the electric device (10) with power outage countermeasures. The second DC electric element (67) is, for example, a main amplifier.

The first and second constant voltages generated by the first and second constant voltage generators (20) and (40) respectively correspond to a microcomputer (22) and a first DC voltage. It is used for the electric element (66), and may be equal to each other or different from each other. The first constant voltage generator (20) and the second constant voltage generator (40) generate an input voltage of a predetermined value or more (hereinafter, referred to as an "operation guaranteed minimum input voltage") in order to generate each constant voltage. .) Must be secured. However, the first constant voltage generator (20) and the second constant voltage generator (4)
In the case of (0), if the input voltage is ensured to be equal to or more than the operation guarantee minimum input voltage, even if the input voltage is considerably high, the function of generating each constant voltage can be achieved without any trouble. Therefore, tapless transformer
(12) is the first constant voltage generator (2) even with the rated voltage of the country where the rated voltage of the commercial AC power supply is the lowest (eg, 100 V in Japan).
It only needs to be set so that the input voltage of 0) is equal to or higher than the operation guarantee minimum input voltage. That is,
In the tapless transformer (12), the secondary voltage differs depending on the rated voltage of the commercial AC power supply in each country, and the tap for adjusting it is omitted in the electric device with power outage measures (10). However, in order to ensure that the input voltage of the first constant voltage generator (20) is equal to or higher than the operation guarantee minimum input voltage at the rated voltage of the country where the rated voltage of the commercial AC power supply is the lowest, the tapless transformer (12) is As long as it is set, there is no need to adjust the taps of the tapless transformers (12) in each country having different rated voltages of the commercial AC power supply. On the other hand, the second constant voltage generator (40) is connected to the secondary side of the second constant voltage generator (40) if only the constant voltage generator is wired on the secondary side. No problem occurs if the voltage changes according to the rated voltage of the commercial AC power supply, but the second DC electric element (67) rectifies the secondary current of the transformer without passing through the constant voltage generator. The current is supplied directly, and unless the secondary voltage is adjusted to a constant value, the operation of the second DC electric element (67) will be hindered. Tap adjustment by users in different countries is indispensable.

While waiting for the power-on instruction, a secondary voltage is induced on the secondary side of the tapless transformer (12), and the first constant voltage generator (20) waits for the first power-on instruction while waiting for the power-on instruction. Generate a constant voltage, supply it to the microcomputer (22),
As a result, the microcomputer (22) secures power for operation while waiting for a power-on instruction, and waits for a power-on instruction from, for example, a wireless remote controller or a main body power key. The power supply switch (26) is switched from off to on.

During power-on, tapless transformer (12)
In both the transformer and the tapped transformer (29), a secondary voltage is induced on the secondary side, and the first constant voltage generator (20) and the second constant voltage generator (40) become effective. The second constant voltage generator (4
0) operates to generate a second constant voltage and supply it to the first DC electrical element (66) to produce a first DC electrical element (66).
Works. Further, the second DC electric element (67) is also operated by being supplied with a current obtained by rectifying the secondary current of the transformer with tap (29). On the other hand, the microcomputer (22) increases the load and the required power during power-on compared to when the power-on instruction is waiting, but increases the required power even if the voltage of the first capacitor (19) decreases appropriately. Before the input voltage of the first constant voltage generator (20) becomes lower than the operation guarantee minimum input voltage of the first constant voltage generator (20), the diode (41) is turned on and the first capacitor (19) is turned on. Is supplied with a current obtained by rectifying the secondary current of the transformer with a tap (29), and the first constant voltage generator (20) holds the input voltage equal to or higher than the operation-guaranteed minimum input voltage; Generate Therefore, the microcomputer
(22) operates without any trouble even during power-on.

The user switches the position of the tap (33) of the tapped transformer (29) in accordance with the rated voltage of the commercial AC power supply in the country where the electric equipment with power outage countermeasures (10) is used. The secondary voltage of the tapped transformer (29) has a constant value irrespective of the rated voltage of the commercial AC power supply. On the other hand, the secondary side voltage of the second constant voltage generator (40) is sufficiently high during the non-power failure during power-on, while almost It becomes 0. The power failure detection means (57) determines that a non-power failure is occurring if the secondary voltage (normally, the effective voltage) of the tapped transformer (29) is equal to or greater than a predetermined value Va, and if the secondary voltage is less than Va, a power failure occurs. Judge that you have done. If the secondary voltage of the tapped transformer (29) during a non-power failure changes according to the rated voltage of the commercial AC power supply, Va as a reference value must also be changed. Since the secondary voltage of the attached transformer (29) is constant, the power failure detection means (57) uses the constant Va as a reference value regardless of the rated voltage of the commercial AC power supply to quickly generate a power failure. Can be detected.

As described above, an electric device with a power failure countermeasure equipped with a common tapless transformer (12) and a dedicated tapless transformer (12) during power-on while the power-on instruction is waiting and during power-on. In (10), the tapless transformers (1
While omitting the tap adjustment for (2), the power failure detection means (5
7) can quickly detect a power failure during power-on.

According to the electric equipment with power outage countermeasure (10) of the present invention, a power outage guarantee power supply (21) which secures electric power for causing the microcomputer (22) to execute protection processing against power outage when a power outage occurs during power-on. When the microcomputer (22) detects the occurrence of a power failure from the input from the power failure detection means (57), the microcomputer (22) performs protection processing against the power failure.

[0015] The protection process (protension process) means, for example, in preparation for power-off, the electric device (1)
The data being processed in the microcomputer (20) is stored in a non-volatile memory or a non-volatile memory so that all functions and at least serious functions of the electric device with power outage countermeasure (10) do not interfere at the next power-on after (0). Microcomputer (20)
This is to store in a dedicated RAM. The microcomputer (22) detects the occurrence of a power failure by an input from the power failure detection means (57) while securing the power for a predetermined time required for the protection process performed when the power failure occurs by the power failure guarantee power supply (21). Immediately, predetermined protection processing can be performed to prevent a failure that may occur due to a sudden power failure.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of a power failure detection unit of the audio device 10. The power plug 11 is inserted into a predetermined outlet supplied with a commercial AC power supply (the rated voltage is 100 V in Japan). The standby and power-on shared transformer 12 has a primary coil 13 and a secondary coil 14, and the primary coil 13 is supplied with commercial AC power from a power plug 11. The full-wave rectifier 18 has a well-known configuration including a bridge circuit of four diodes, rectifies the secondary current of the secondary coil 14, and uses the rectified current to form an electrolytic capacitor.
Charge 19 5V-AVR (AVR: Automat
ic Voltage Regulator: = constant voltage generator) 20 receives the voltage of electrolytic capacitor 19,
Generate a constant voltage of 5V. In all constant voltage generators including the 5V-AVR20, in order to output a constant voltage, the input side voltage is higher than the constant voltage by a predetermined amount (for example, 0.5 V) (hereinafter referred to as "operation guaranteed minimum input voltage"). It is necessary to be maintained more. The 5V-AVR 20 generates a constant voltage of 5V, charges the electrolytic capacitor 21 with the 5V voltage, and transfers the 5V voltage to the microcomputer 22.
Supply to The electrolytic capacitor 21 plays a role of guaranteeing power supply to the microcomputer 22 for a predetermined time when a power failure occurs. The main body of the audio device 10 is equipped with a power key for manual operation by a user and a hand-held wireless remote controller (not shown). The microcomputer 22 is supplied with power from the 5V-AVR 20 even when the power switch relay 26 is off, waits for a power-on instruction by a user's power key operation on the main body, and also hands-off a receiver (not shown). It waits for the reception of a power-on signal from the type wireless remote controller, detects a power-on instruction, and switches the power switch relay 26 from off to on.

The power-on dedicated transformer 29 has a primary coil
A tap 33 is provided on the primary side together with the secondary coil 31 and the secondary coils 31 and 32. The user switches the position of the tap 33 according to the rated voltage of the commercial AC power supply in each country, and the power-on dedicated transformer 29
In the above, the turns ratio between the primary side and the secondary side is switched so that the induced voltage of the secondary coils 31, 32 during power-on becomes constant irrespective of the rated voltage of the commercial AC power supply in each country.
Commercial AC power is supplied to the primary coil 30 from the power plug 11 when the power switch relay 26 is turned on. Full-wave rectifier
35 rectifies the secondary current of the electrolytic capacitor 21 and charges the electrolytic capacitor 39 with the rectified current. The voltage of the electrolytic capacitor 39 is supplied to the 5V-AVR 40,
It is supplied to the electrolytic capacitor 19 via the diode 41.
At power-on time when the power switch relay 26 is on, the load on the microcomputer 22 is greater than at standby time (= at power-on signal standby time), so that the electrolytic capacitor 19 has a rectified current from the full-wave rectifier 18. If the battery is charged only by itself, the voltage may be lower than the operation guarantee minimum input voltage of 5V-AVR20. For this reason, at the time of power-on, in addition to the rectified current from the full-wave rectifier 18, the electrolytic capacitor 19
The power supply is also charged by the rectified current from the power supply, and the operation-guaranteed minimum input voltage of the 5V-AVR20 during power-on can be maintained. The 5V-AVR 40 receives the voltage of the electrolytic capacitor 39 and generates a constant voltage of 5V. 5V-AVR40 is an electrolytic capacitor 42 at its constant voltage.
And supplies the constant voltage to various DC electric elements 66 of the audio device 10. The DC electrical element 66 includes a module and an IC
Etc. are included. The full-wave rectifier 43 rectifies the secondary current of the secondary coil 32 and charges the electrolytic capacitor 44 with the rectified current. The voltage of the electrolytic capacitor 44 is supplied to the main amplifier 67.

Both ends of the secondary coil 31 are commonly connected to one end of a resistor 48 via diodes 46 and 47, respectively. The resistor 48 is grounded at the other end via a resistor 49, and the capacitor 50 is connected in parallel with the resistor 49. The resistor 54 has one end connected to the output terminal of the 5V-AVR 40 and the other end connected through a diode 55 to the resistor 4.
8, 49 (here, the voltage at this connection point is defined as “V1”). The detection unit 57 uses the voltage V2 between the resistor 54 and the diode 55 as an input voltage, compares V2 with a reference value Vr, and outputs an output based on the comparison result to the microcomputer 22.

The operation of the audio device 10 will be described. While waiting for a power-on instruction, the system waits for reception of a power-on signal from the wireless remote controller, and also waits for a user operation of the power key of the main body. The power switch relay 26 is off, and the commercial AC power supply of the power plug 11 is turned off. Is the primary coil of the power-on dedicated transformer 29
Not supplied to 30, common transformer during standby and power-on
12 is supplied only to the primary coil 13 and the electrolytic capacitor 19
Is charged by the rectified current from the full-wave rectifier 18 and
The V-AVR20 maintains the operation guarantee minimum input voltage or more. As a result, the 5V-AVR 20 generates a constant voltage of 5 V and supplies it to the microcomputer 22. The microcomputer 22 operates while waiting for a power-on instruction.
That is, it monitors whether the power-on signal is received by the receiver and whether the power key of the main body is operated, and when the reception and the operation of the power key are detected, necessary power is secured for the operation of switching the power switch relay 26 from off to on. Have been. Since the processing of the microcomputer 22 while waiting for the reception of the power-on signal is limited, if a power failure of the commercial AC power
Even if the operation of the microcomputer 22 is stopped immediately, there is no particular problem in restarting the microcomputer 22 when the next commercial AC power supply returns after the end of the power failure.

Upon detecting a power-on instruction such as reception of a power-on signal from a wireless remote controller, the microcomputer 22 switches the power switch relay 26 from off to on, thereby connecting the power plug 11 to the primary coil 30. AC power is supplied from the secondary coils 31 and 32
A secondary current is generated. After the secondary current of the secondary coil 31 is rectified by the full-wave rectifier 35, the secondary capacitor 31 charges the electrolytic capacitor 39, and the electrolytic capacitor 39 is maintained at a voltage equal to or higher than the operation guarantee minimum input voltage of 5V-AVR40. Further, the diode 41 is biased in the forward direction, a part of the rectified current of the full-wave rectifier 35 charges the electrolytic capacitor 19 via the diode 41, and the voltage of the electrolytic capacitor 19 is changed by the microcomputer 22 at power-on. 5V-A despite increased load
Keep the operation input voltage of VR20 above the guaranteed minimum input voltage. Thus, the 5V-AVRs 20, 40 generate a constant voltage of 5V,
The output of the V-AVR 40 is supplied to each DC electric element 66 of the audio device 10. Also, the secondary current of the secondary coil 32 is
After being rectified by the full-wave rectifier 43, the electrolytic capacitor 44
, And the main amplifier 67 is supplied with the voltage of the electrolytic capacitor 44.

During power-on, the effective voltage at both ends of the secondary coil 31 is sufficiently high, and the voltage between the resistors 48 and 49, that is, V1 is appropriately higher than 5V as the output voltage of the 5V-AVR40. Has been maintained. As a result, the diode 55 is reverse-biased and turned off, and the input voltage V2 of the detection unit 57 is maintained substantially at the output voltage of 5V-AVR40, and is higher than the reference value Vr. Accordingly, the detection unit 57 outputs a signal related to V2 ≧ Vr to the microcomputer 22, and the microcomputer 22 performs a normal process during power-on assuming that no power failure has occurred.

If a power failure occurs in the commercial AC power supply during power-on, the effective voltage at both ends of the secondary coil 31 decreases, and V
1 also decreases. V1 is the voltage of the electrolytic capacitor 42 (= 5V
5V as the output voltage of AVR40. For a predetermined time immediately after the power failure, the electrolytic capacitor 42 is maintained at approximately 5 V by sufficient charging until immediately before the power failure. ), The diode 55 becomes forward biased and turned on, the current flows from the electrolytic capacitor 42 to the resistor 54, and V2 decreases by the voltage drop of the resistor 54 to become less than Vr. become. The detection unit 57 outputs a voltage indicating that V2 has become less than Vr to the microcomputer 22, and the microcomputer 22 detects the occurrence of a power failure and performs predetermined protection processing. The electrolytic capacitor 21 also maintains a suitably high value for a predetermined time after the occurrence of the power failure by sufficient charging from the 5V-AVR 20 before the occurrence of the power failure, and guarantees power during the protection processing of the microcomputer 22. After completion of the protection process, the microcomputer 22 switches the power switch relay 26 from on to off.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a power failure detection unit of an audio device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Audio equipment (Electrical equipment with a power failure countermeasure) 12 Transformer for common use at standby and at power-on (transformer without tap) 19 Electrolytic capacitor (first capacitor) 20 5V-AVR (first constant voltage generator) 21 Electrolysis Capacitor (power supply for guarantee during power failure) 22 Microcomputer 26 Power switch relay (switch for supplying commercial AC power) 29 Dedicated transformer at power-on (transformer with tap) 36 Tap 39 Electrolytic capacitor (second capacitor) 405 V- AVR (second constant voltage generator) 41 Diode 57 Detector (power failure detection means) 66 DC electric element (first DC electric element) 67 Main amplifier (second DC electric element)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H02M 7/06 H02M 7/06 FF term (Reference) 5G015 FA16 GB02 GB03 HA02 HA14 HA18 JA05 JA06 JA32 JA62 KA06 5G065 BA02 DA01 DA04 DA06 EA07 FA01 GA06 GA07 HA02 HA04 LA01 MA09 NA01 NA02 NA06 NA09 NA10 5H006 BB06 CA07 CB05 CC04 CC08 DC05 FA04 FA05

Claims (2)

[Claims] When a power-on instruction is on standby, a microcomputer (22) is operated to receive a power-on signal from a wireless remote controller and to perform a power-on instruction by a manual operation of a power instruction operation unit in an electric apparatus main body. , And switches the commercial AC power supply switch (26) from off to on in response to the power-on instruction. Also, while the power is on, the first DC electric element (66) is operated together with the microcomputer (22). ), The tap-less transformer (12), which is supplied with commercial AC power to the primary side while the power-on instruction is on standby and during power-on, and A first capacitor (19) charged by a current obtained by rectifying a secondary current of a transformer (12), a first constant voltage for generating a first constant voltage from the voltage of the first capacitor (19) Generator (20), a tap which is supplied with commercial AC power to the primary side only during power-on, and a user switches taps in relation to the rated voltage of the commercial AC power to adjust the secondary voltage to a predetermined value. A transformer with a tap (29), a second capacitor (39) charged by a current obtained by rectifying a secondary current of the transformer with a tap (29), a second constant from the voltage of the second capacitor (39). A second constant voltage generator (40) for generating a voltage and supplying a second constant voltage to each of the first DC electric elements (66); the tapped transformer (29) without passing through a constant voltage generator; ), A second DC electric element (67) that operates by receiving a rectified current from the secondary current of the second capacitor (39) to the first capacitor (1).
The input voltage of the first constant voltage generator (20) interposed between the second capacitor (39) and the first capacitor (19) so as to be forward to Before the constant voltage generator (20) of the first constant voltage generator (20) becomes lower than a voltage capable of generating the constant voltage (hereinafter, referred to as “operation guaranteed minimum input voltage”), the first constant voltage generator (20). ), A diode (41) for securing the input voltage of the operation guarantee minimum input voltage or more, and a power failure of the commercial AC power supply from the secondary voltage of the transformer with a tap (29), and a detection result of the microcomputer (22). An electric device with power failure countermeasures, comprising: a power failure detection means (57) for outputting power to the power supply. 2. A power failure guarantee power supply (21) is provided for securing power to cause the microcomputer (22) to execute a protection process against a power failure when a power failure occurs during power-on, and the microcomputer (22) comprises: The power failure detection means (57)
2. The electric device with a power failure countermeasure according to claim 1, wherein a protection process against the power failure is performed when the occurrence of a power failure is detected from an input from the device.