JP6579970B2 - Power supply device - Google Patents

Description

  The present invention relates to a power supply device that switches between power based on an external power supply and power supplied from a battery and supplies the power to a control circuit.

  2. Description of the Related Art Conventionally, there is known a power supply device that switches between power supplied from an external power supply such as a commercial power supply and power supplied from a battery and supplies the power to a control circuit (for example, see Patent Document 1).

  In Patent Document 1, when a power supply from a commercial power source is cut off due to a power failure in a gas stove that operates a control circuit with power supplied from a commercial power source, power is supplied from the battery to the control circuit. A configuration is described in which a gas stove can be used.

  The gas stove described in Patent Literature 1 is provided with a battery loading unit, and the user can use the gas stove as soon as possible by setting the battery in the battery loading unit when a power failure occurs.

  Moreover, in the gas stove described in Patent Document 1, an output unit of a power supply smoothing circuit that generates DC power from a commercial power supply and a terminal of a battery loading unit are connected. This connection point is connected to the input part of the regulator, and the output part of the regulator is connected to the power supply terminal of the control circuit (control device). Furthermore, the battery loading unit and the connection location are connected via a switching element (FET).

  With such a configuration, when power is supplied from a commercial power supply, power is always supplied from the power supply smoothing circuit to the control circuit. Specific processing that needs to be performed can be continued. In addition, when power is supplied from the battery during a power failure of the commercial power supply, the battery life is reduced by turning off the switching element when the gas stove is not in use (shut off) to cut off the power supply from the battery to the control circuit. Can be extended.

JP 2009-85491 A

  The gas stove described in Patent Document 1 basically has a specification (commercial power supply specification) that operates with electric power supplied from a commercial power supply, but the gas stove also has a specification that operates with a battery (battery specification). For products with different power supply specifications but with the same specifications for control circuits that are supplied with power from the power supply, the control circuits used for commercial power supply specifications and battery specification products must be shared. As a result, the productivity of the circuit board can be improved.

  Here, in the gas stove with a battery specification, when the gas stove is not used, the process of extending the battery life by cutting off the power supply from the battery to the control circuit is generally performed. However, if the control circuit is shared and the power supply to the control circuit is shut off when the gas stove is not in use, the specified process that should be executed at all times, such as the above-described timing process, can be executed. There is an inconvenience of disappearing.

  The present invention has been made in view of such a background, and when a control circuit is shared between a commercial power supply specification product and a battery specification product, power to the control circuit when used in a battery specification product. It is an object of the present invention to provide a power supply device that can cut off the supply and continue a specific process when used in a product with a commercial power supply specification.

A power supply apparatus according to the present invention includes a power switch connecting portion to which a power switch is connected, a first power connecting portion, a first control circuit that operates by electric power supplied from the first power connecting portion, and the first A first control signal that is provided in a connection path between a power supply connection portion and the first control circuit and is input to the power supply switch connection portion in response to an operation of the power switch and a first control circuit that is output from the first control circuit. 2 a switching element for inputting a control signal to a control input terminal, and a second power source connection part connected to a power source input part of the first control circuit, and the switching element is rendered conductive by the input of the first control signal. After the first control circuit is activated in the state, the control element is controlled so that the switching element is turned on by the second control signal output from the first control circuit according to the first predetermined condition. And Tsu bets, is connected to the first power connection and via the second power supply connection portion, a power supply device for supplying power to the first power supply connection portion,
An external power connection connected to an external power source;
A first power output circuit that outputs first DC power based on power supplied from the external power supply via the external power supply connection unit;
A battery connection connected to the battery housing;
The second DC that is connected to the output unit of the first power output circuit, the battery connection unit, and the first power supply connection unit, and is supplied from the battery stored in the battery storage unit via the battery connection unit. A dual power connection circuit for supplying power or the first DC power to the first power connection;
A second control circuit connected to the second power supply connection unit and operated by electric power supplied from the second power supply connection unit;
A third control signal input circuit for inputting a third control signal output from the second control circuit to a control input terminal of the switching element;
An external power source detection unit that detects that power is supplied from the external power source,
The second control circuit outputs the third control signal to maintain the switching element in a conductive state when the external power supply detection unit detects that power is supplied from the external power supply. Thus, the power supply from the second power supply connection unit to the second control circuit is continued to execute the specific process.

  In the control unit connected to the power supply device of the present invention via the first power supply connection portion and the second power supply connection portion, the switching element is brought into a conductive state by the input of the first control signal according to the operation of the power switch. Thus, electric power is supplied from the first power supply connection portion to the first control circuit, and the first control circuit is activated. And after starting, the 1st control circuit can switch supply and interruption of electric power to the 1st control circuit by outputting the 2nd control signal according to the 1st predetermined condition. Therefore, when the control unit is used with a battery specification product, the first predetermined condition is set to cut off the power supply to the first control circuit when the use of the product is finished, thereby extending the battery life. be able to.

  Further, the second control circuit provided in the power supply device includes power (first DC power or second power) from the two power supply connection circuit via the first power supply connection unit, the switching element, and the second power supply connection unit. DC power) is supplied. Then, the second control circuit outputs a third control signal and performs control for bringing the switching element into a conductive state.

  As described above, the second control circuit provided in the power supply device is configured to be able to control the switching element to the conductive state independently of the first control circuit provided in the control unit. .

  Therefore, even when the output of the second control signal from the first control circuit is stopped, the second control circuit detects that power is supplied from the external power source by the external power source detection unit. In this case, the third control signal can be output to keep the switching element in the conductive state. As a result, it is possible to continue the power supply from the second power supply connection unit to the second control circuit and execute a specific process (such as a time measurement process that requires constant operation).

The second control circuit outputs the third control signal according to a second predetermined condition when it is not detected by the external power supply detection unit that power is supplied from the external power supply. The power supply to the second control circuit is switched between cutoff and supply.

According to this configuration, the external power supply detection unit does not detect that power is supplied from the external power supply, and the second control circuit is operating with the second DC power supplied from the battery. Sometimes, the battery life can be extended by outputting the third control signal in accordance with the second predetermined condition and switching between supply and interruption of power to the second control circuit.

Further, the control unit is mounted on a board different from the board on which the power supply device is mounted .

  According to this configuration, by configuring the control unit on a separate board, in a commercial power supply product, the board on which the control unit is mounted is connected to the power supply device of the present invention. Can be operated. In addition, in the battery specification product, the control unit can be operated by connecting the board on which the control unit is mounted to the power supply board having a simple configuration in which the second control circuit and the second control signal input circuit are omitted. it can.

Explanatory drawing of a structure and use condition of the power supply apparatus of this invention.

  An example of an embodiment of the present invention will be described with reference to FIG.

[1. Configuration of power supply device and control board]
Referring to FIG. 1, a power supply device 1 of the present embodiment is used by being mounted on a commercial power supply type gas stove, and includes a DC power supply 10 and a power supply board 20. The power supply board 20 is connected to the control board 50 via the connector 28 (corresponding to the first power supply connection part and the second power supply connection part of the present invention) and the connector 54, and the power supply board 20 to the control board 50. Is supplied with DC power. The circuit mounted on the control board 50 corresponds to the control unit of the present invention.

  The DC power source 10 is connected to the commercial power source 2 (corresponding to the external power source of the present invention) and connected to the connector 26 (corresponding to the external power source connecting portion of the present invention) of the power supply board 20. DC13V DC power is generated from the AC100V AC power input and supplied to the power supply board 20.

  The power supply board 20 includes a step-down circuit 21, a power pulse processing circuit 22, a second microcomputer 23 (corresponding to a second control circuit of the present invention), and connectors 25 to 28. The step-down circuit 21 has an input unit connected to the connector 26 and an output unit connected to the connector 28, and steps down DC13V DC power input from the connector 26 to DC3V and outputs it to the connector 28. The DC power supply 10 and the step-down circuit 21 constitute a first power output circuit of the present invention.

  The connector 25 (corresponding to the battery connecting portion of the present invention) is connected to the battery housing portion 4, and DC power around DC 3 V is input from the battery 3 set in the battery housing portion 4. The connector 25 is connected to the output portion of the step-down circuit 21 by the dual power supply connection circuit 29 via the diodes 30 and 31, whereby the first DC power Pw 1 output from the step-down circuit 21 and the battery 3 are connected. Of the second DC power Pw2 to be output, the power having the higher voltage is output to the connector 28.

  The power pulse processing circuit 22 generates a DC pulse signal Psig having the same cycle as the AC power output from the commercial power supply 2 and outputs the pulse signal Psig to the input port Pi1 of the second microcomputer 23. The second microcomputer 23 includes a CPU, a memory, an input / output interface, and the like, and controls the operation of the power supply board 20 by executing a control program for the power supply board 20 held in the memory by the CPU.

  An AD (analog / digital conversion) port Pad of the second microcomputer 23 is connected to the (+) pole side of the battery housing part 4 via the connector 25. When the battery 3 is accommodated in the battery accommodating portion 4, the output voltage of the battery 3 is input to the AD port Pad of the second microcomputer 23 and converted into a digital value. Further, DC power of 3 V DC is supplied from the control board 50 to the power supply terminal and the GND terminal of the second microcomputer 23 via the connectors 28 and 54.

  The second microcomputer 23 outputs a power hold signal Ph2 (corresponding to a third control signal of the present invention, which will be described later in detail) to maintain power supply to itself via the connectors 28 and 54 to the control board 50. To do. Further, in the second microcomputer 23, the pulse signal Psig is input to the input port Pi1 (it is recognized that power is supplied from the commercial power supply 2), and a voltage of a predetermined level or higher is input to the AD port Pad. When it is recognized that the battery 3 is set in the battery housing 4, the notification signal Ebs is output from the output port Po 2 to the connector 27.

  The circuit configuration for connecting the output port Po1 of the second microcomputer 23 and the control input terminal (gate terminal) of the switching element 56 corresponds to the third control signal input circuit of the present invention).

  The connector 27 is connected to a display (not shown), and the lamp of the display is turned on according to the output of the notification signal Ebs. Thereby, it is possible to prompt the user to remove the battery 3 from the battery housing portion 4.

  The configuration in which the power supply pulse processing circuit 22 and the second microcomputer 23 recognize that the pulse signal Psig is input to the input port Pi1 and detect that power is supplied from the commercial power supply 2 is as follows. This corresponds to the external power supply detection unit of the invention.

  Next, the control board 50 includes a booster circuit 51, a first microcomputer 52 (corresponding to a first control circuit of the present invention), a switching element 56, and connectors 53 to 55. The input part of the booster circuit 51 is connected to the connector 54 via the switching element 56, and the output part is connected to the power input part of the first microcomputer 52 and the connector 54. When the direct current supplied from the power supply board 20 via the connectors 28 and 54 is lower than DC3V, the booster circuit 51 boosts the voltage to DC3V and outputs it.

  The DC power output from the booster circuit 51 is supplied as a power source for the first microcomputer 52 and also supplied as a power source for the second microcomputer 23 of the power supply board 20 via the connectors 54 and 28.

  The connector 53 (corresponding to the power switch connecting portion of the present invention) is connected to the power switch 5, and the input port Pi 1 of the first microcomputer 52 is connected to the connector 54 via the connector 53 and the power switch 5. Therefore, while the user is pressing the power switch 5, a Pon signal (power ON signal, corresponding to the first control signal of the present invention) is input to the input port Pi1.

  A DC voltage signal Psen indicating a DC voltage supplied from the power supply board 20 via the connectors 28 and 54 is input to the AD port Pad of the first microcomputer 52. The first microcomputer 52 converts the DC voltage signal Psen into a digital value and recognizes it, and outputs a notification signal Ebw prompting battery replacement to the connector 55 when the DC voltage signal Psen falls below a predetermined level.

  The connector 55 is connected to a display (not shown), and the lamp of the display is turned on according to the output of the notification signal Ebw. This can prompt the user to replace the battery 3.

[2-1. Operation when used with products with commercial power supply specifications-Commercial power supply operation]
When a power supply board 20 and a control board 50 are provided in a commercial power supply specification product (gas stove or the like), the commercial power supply 2 is connected to the DC power supply 10, and a DC of 13 V DC is supplied from the DC power supply 10 to the power supply board 20 When the power is supplied, the first DC power Pw1 is output from the step-down circuit 21.

  When the user turns ON the power switch 5 (use start operation), the switching element 56 is turned ON (conductive state), and the first microcomputer 52 and the second microcomputer 52 are connected from the step-down circuit 21 via the connectors 28 and 54. DC power is supplied to the microcomputer 23, and the first microcomputer 52 and the second microcomputer 23 are activated. At this time, the power switch ON signal Pon is input to the input port Pi1 of the first microcomputer 52.

  The first microcomputer 52 outputs a hold signal Ph1 (power supply hold signal, which corresponds to the second control signal of the present invention) from the output port Po1, thereby switching even after the user finishes the operation of the power switch 5. It is assumed that the element 56 is maintained in the ON state. Thereafter, when the user turns off the power switch 5 (use termination operation) and the input of the power switch ON signal Pon to the input port Pi1 of the first microcomputer 52 stops, the first microcomputer 52 outputs the output port Po1. Stops the output of the hold signal Ph1.

  The second microcomputer 23 has a clock function that counts the pulse signal Psig output from the power pulse processing circuit 22 to calculate the current time (the clock function process corresponds to the specific process of the present invention). This clock function must continue even when the gas stove is not in use. Therefore, the second microcomputer 23 maintains the state in which the hold signal Ph2 is output from the output port Po1 from the start-up, and the first DC power Pw1 is supplied to the second microcomputer 23 even after the power switch 5 is turned off. To enable the clock function.

  The first microcomputer 52 controls the overall operation of the gas stove, and the second microcomputer 23 controls the operation of an electric load (such as a display (not shown)) that operates using DC 13V as a power source. The second microcomputer 23 and the first microcomputer 52 communicate with each other via a communication wiring (not shown).

  The second microcomputer 23 performs a process of determining whether or not the battery 3 is set in the battery housing portion 4 described above. When the battery 3 is set in the battery housing portion 4, the second microcomputer 23 outputs a notification signal Ebs to output the user. Prompts removal of the battery 3.

[2-2. Operation when using a commercial power source gas stove-battery operation]
When a power failure occurs in the commercial power supply 2, the user can operate the gas stove by using the battery 3 as a power source by setting the battery 3 in the battery housing 4. In this case, when the user presses the power switch 5, the switching element 56 is turned on, and the second DC power Pw 2 output from the battery 3 is supplied to the booster circuit 51 via the dual power supply connection circuit 29 and the connectors 28 and 54. , And the first microcomputer 52 and the second microcomputer 23 are activated by the DC power output from the booster circuit 51.

  The first microcomputer 52 outputs a hold signal Ph1 (power supply hold signal) from the output port Po1, so that the switching element 56 is maintained in the ON state even after the user finishes the operation of the power switch 5. To do. Thereafter, when the user turns off the power switch 5 (use termination operation) and the input of the power switch ON signal Pon to the input port Pi1 of the first microcomputer 52 stops, the first microcomputer 52 outputs the output port Po1. Stops the output of the hold signal Ph1.

The second microcomputer 23 outputs a hold signal Ph2 from the output port Po1 at startup. Since there is no input of the pulse signal Psig to the input port Pi1, when it is recognized that the second microcomputer 23 is operated by the second DC power Pw2 supplied from the battery 3, the power switch 5 is turned off. When this is recognized by communication with the first microcomputer 52, the output of the hold signal Ph2 is stopped. The condition for outputting the hold signal Ph2 corresponds to the second predetermined condition of the present invention.
Thereby, the switching element 56 is turned off (shut off state), the supply of the second DC power from the battery 3 is stopped, and the effect of extending the life of the battery 3 is obtained.

  Further, the first microcomputer 52 monitors the level of the DC voltage signal Psen input to the AD port Pad, and when the level of the DC voltage signal Psen becomes less than a predetermined level, a signal for prompting battery replacement is sent to the connector 55. Output.

[3. Operation when using battery-powered gas stoves]
A battery-powered gas stove uses a power supply board having a different specification from the power supply board 20. The power supply board does not require the connector 26, the step-down circuit 21, the power pulse processing circuit 22, and the like.

  Therefore, with the power supply board 20 and the control board 50 as separate boards, the connector 26, the step-down circuit 21, the power pulse processing circuit 22, and the power supply board 20, which are required only when used on a commercial power supply type gas stove, By mounting the second microcomputer 23 and the like, it is possible to avoid mounting unnecessary parts on the shared control board 50 when used in a gas-powered gas stove, and by sharing the control board 50 The effect can be enhanced.

  When the user turns on the power switch 5, the switching element 56 is turned on (conductive state), and DC power is supplied from the battery 3 to the first microcomputer 52 and the second microcomputer 23 via the connectors 25 and 28. Then, the second microcomputer 23 and the first microcomputer 52 are activated. When the first microcomputer 52 recognizes the input of the power ON signal Pon to the input port Pi1, the first microcomputer 52 outputs the hold signal Ph1 from the output port Po1 and maintains the switching element 56 in the ON state. Thereby, even if a user complete | finishes pressing operation of the power switch 5, the power supply to the 2nd microcomputer 23 and the 1st microcomputer 52 continues.

  The first microcomputer 52 converts the DC voltage signal Psen input to the AD port Pad into a digital value to monitor the output voltage of the battery 3, and when the output voltage of the battery 3 becomes less than the lower limit level, the output port The notification signal Ebw is output from Po2.

  The first microcomputer 52 stops the output of the hold signal Ph1 from the output port Po1 when detecting the input of the power switch ON signal Pon to the input port Pi1. As a result, the switching element 56 is turned off (shut off), the supply of the second DC power Pw2 from the battery 3 to the first microcomputer 52 and the second microcomputer 23 is stopped, and the life of the battery 3 is extended. Is obtained. The condition for outputting the hold signal Ph1 corresponds to the first predetermined condition of the present invention.

[4. Other Embodiments]
In the present embodiment, the power supply board 20 and the control board 50 are separate boards, but the configuration of both boards may be mounted on a single board. Also in this case, the circuit unit corresponding to the control board 50 does not need to be provided with a control circuit for performing a specific process that needs to be executed constantly, such as a timekeeping function. By reducing the number of parts of the common control circuit, the effect of sharing the control circuit can be enhanced.

  In this embodiment, a gas stove is presented as an example of a product having a commercial power supply specification and a battery specification. However, if the product has a common control circuit between products having a commercial power supply specification and a battery specification, this The invention can be applied.

  Further, in the present embodiment, it is detected that the battery 3 is housed in the battery housing portion 4 by recognizing the voltage level by inputting the connection terminal of the battery housing portion 4 to the AD port Pad of the second microcomputer 23. However, the comparator compares the output of the connection terminal of the battery housing unit 4 with the threshold voltage, and inputs the output of the comparator (digital signal) to the input port (digital input port) of the second microcomputer 23 to input a binary value. It is good also as a structure which detects that the battery 3 is accommodated in the battery accommodating part 4 by a level (High / Low).

  In the present embodiment, the commercial power source 2 is shown as the external power source of the present invention, but the present invention can also be applied when a rechargeable battery or the like is used as the external power source.

  DESCRIPTION OF SYMBOLS 1 ... Power supply device, 2 ... Commercial power supply (external power supply), 3 ... Battery, 5 ... Power switch, 10 ... DC power supply, 20 ... Power supply board, 21 ... Step-down circuit, 22 ... Power supply pulse processing circuit, 23 ... 1st 2 microcomputers (second control circuit), 29... Two power supply connection circuits, 50... Control board (control unit), 51... Booster circuit, 52 ... first microcomputer (first control circuit), 56.

Claims (3)

A power switch connecting portion to which a power switch is connected, a first power connecting portion, a first control circuit that operates by power supplied from the first power connecting portion, the first power connecting portion, and the first control A first control signal that is provided in a connection path between the circuits and that is input to the power switch connection unit according to an operation of the power switch and a second control signal that is output from the first control circuit are input to the control input terminal. An input switching element; and a second power supply connecting part connected to a power input part of the first control circuit, and the switching element is rendered conductive by the input of the first control signal. After the circuit is activated, the second control signal output from the first control circuit according to a first predetermined condition and the control unit in which the switching element is controlled to be in a conductive state, and the first power supply connection Parts and are connected via the second power supply connection portion, a power supply device for supplying power to the first power supply connection portion,
An external power connection connected to an external power source;
A first power output circuit that outputs first DC power based on power supplied from the external power supply via the external power supply connection unit;
A battery connection connected to the battery housing;
The second DC that is connected to the output unit of the first power output circuit, the battery connection unit, and the first power supply connection unit, and is supplied from the battery stored in the battery storage unit via the battery connection unit. A dual power connection circuit for supplying power or the first DC power to the first power connection;
A second control circuit connected to the second power supply connection unit and operated by electric power supplied from the second power supply connection unit;
A third control signal input circuit for inputting a third control signal output from the second control circuit to a control input terminal of the switching element;
An external power source detection unit that detects that power is supplied from the external power source,
The second control circuit outputs the third control signal to maintain the switching element in a conductive state when the external power supply detection unit detects that power is supplied from the external power supply. Thus, the power supply apparatus is characterized in that the power supply from the second power supply connection unit to the second control circuit is continued to execute the specific process. The power supply device according to claim 1,
The second control circuit outputs the third control signal according to a second predetermined condition when it is not detected by the external power supply detection unit that power is supplied from the external power supply. A power supply apparatus that switches between power supply to the second control circuit and cutoff. In the power supply device according to claim 1 or 2,
The power supply apparatus, wherein the control unit is mounted on a board different from the board on which the power supply apparatus is mounted .