A countdown timer

Abstract

The utility model discloses a countdown timer, which is used for socket power output and / or countdown to stop socket power output, and comprises an upper shell and a lower shell, wherein a power board is arranged in the lower shell, a socket seat, a power circuit and an execution circuit are arranged on the power board, a battery is arranged on the power board, a plurality of buttons are symmetrically arranged on the upper shell, each of the button shells is provided with an LED lamp bead, a control board is arranged in the upper shell, a control circuit is arranged in the control board, the power circuit, the execution circuit and the control circuit are electrically connected respectively; the button inputs a signal to the control circuit, and the control circuit outputs a signal to the execution circuit to control the connection or disconnection of the countdown timer. The utility model has the following advantages and effects: when the countdown timer is disconnected from the AC mains briefly due to power grid fluctuations, the setting content is not lost, and the countdown time operation is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of sockets and timing, in particular to a countdown timer. Background Art

[0002] A socket is a commonly used electrical device that provides a power interface for household appliances. It is a seat into which one or more circuit wiring can be inserted. Various wiring can be inserted through it to facilitate connection with other circuits. The connection and disconnection between the line and the copper parts can ultimately achieve the connection and disconnection of this part of the circuit.

[0003] The countdown timer is a type of timing socket. You can set the countdown time and disconnect the power supply of the socket after the set time is reached. This allows the socket to be disconnected intelligently to ensure the safe use of electrical appliances.

[0004] However, if the power grid is unstable and the power is disconnected briefly, the set countdown will be reset to zero, data will be lost, and the socket cannot be disconnected during the countdown. Utility Model Content

[0005] The utility model aims to provide a countdown timer, in which a battery is built in a housing of the countdown timer, and when the alternating current mains power is disconnected temporarily, the setting contents are not lost and the countdown time operation is not affected.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: a countdown timer, used for socket power output and / or countdown to stop socket power output, comprising an upper shell and a lower shell, a power board is arranged in the lower shell, a socket head, a power circuit and an execution circuit are arranged on the power board, a battery is arranged on the power board, a plurality of buttons are symmetrically arranged on the upper shell, each of the button shells is provided with an LED lamp bead, a control board is arranged in the upper shell, a control circuit is arranged in the control board, the power circuit, the execution circuit and the control circuit are electrically connected respectively; the button inputs a signal to the control circuit, and the control circuit outputs a signal to the execution circuit to control the connection or disconnection of the countdown timer.

[0007] The utility model is further configured as follows: the lower shell is a rectangular shell, a plug hole is provided on the side of the lower shell, the socket head is symmetrically arranged on both sides of the power board and abuts against the side of the lower shell, and the plug hole of the socket head overlaps and is arranged in parallel.

[0008] The utility model is further configured as follows: a plug is provided on the bottom surface of the lower shell, the plug is electrically connected to the power board, and the socket head is electrically connected to the power board.

[0009] The utility model is further configured as follows: the keys include a power key, a reset key, and a countdown key, and the keys are distributed in two parallel rows, upper and lower rows.

[0010] The utility model is further configured as follows: the upper shell is trapezoidal.

[0011] The utility model is further configured as follows: the power supply circuit includes a rectifier filter circuit and a step-down voltage stabilizing circuit, and the step-down voltage stabilizing circuit outputs a DC voltage by stabilizing the voltage through a voltage stabilizing diode.

[0012] The utility model is further configured as follows: the step-down voltage stabilizing circuit includes a capacitor C2, a Zener diode ZW1, a resistor R4, a Zener diode ZW2, and a capacitor C3; the Zener diode ZW1 is connected in parallel to the output end of the rectifier and filter circuit; the capacitor C2 is connected in parallel to the Zener diode ZW1; the Zener diode ZW1 outputs a DC voltage by first-level voltage stabilization; the resistor R4 is connected to the capacitor C2, the Zener diode ZW2 is connected to the resistor R4, the capacitor C3 is connected in parallel to the Zener diode ZW2; the Zener diode ZW2 outputs a DC voltage by second-level voltage stabilization.

[0013] The utility model is further configured as follows: the step-down voltage stabilizing circuit is connected in parallel with a battery, and the battery is connected to a resistor R5 and then to a secondary voltage stabilizing output terminal.

[0014] The utility model is further configured as follows: the execution circuit includes a relay K1, the main circuit input end of the relay K1 is connected to the live wire end L-in, the main circuit output end of the relay K1 is connected to the socket output end L-out, one end of the trigger circuit of the relay K1 is connected to the primary voltage-stabilized output DC voltage, and the other end is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the resistor R3 and then connected to the signal point relay, and the relay K1 trigger circuit is connected in parallel with a diode D1.

[0015] The utility model is further configured as follows: the control circuit includes a control chip U1 that receives and stores key signal data according to program logic operation, and outputs a signal to drive a relay to connect or disconnect the socket.

[0016] The countdown timer of the utility model does not lose the setting content and does not affect the countdown time operation when the AC mains is disconnected temporarily due to power grid fluctuations, and the battery can be fully charged once to ensure power-off memory for 15 days. The countdown button positions can be independently timed or superimposed, and the flexibility of button operation is fully considered, which can be pressed sequentially or multiple buttons can be pressed simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front perspective view of the countdown timer in the embodiment.

[0018] Figure 2 It is a back perspective view of the countdown timer in the embodiment.

[0019] Figure 3is an exploded view of the countdown timer in the embodiment.

[0020] Figure 4 1 is a schematic diagram of a power supply circuit and an execution circuit on a power supply board in an embodiment.

[0021] Figure 5 1 is a schematic diagram of a control circuit on a control board in an embodiment.

[0022] In the figure: 100, upper shell; 101, button; 102, LED lamp bead; 103, control board; 104, power button; 105, reset button; 106, countdown button; 200, lower shell; 201, power board; 202, socket head; 203, jack; 204, plug. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field without making creative work based on the embodiments of the utility model are within the scope of protection of the utility model.

[0024] like Figure 1-3 As shown, the present embodiment discloses a countdown timer, which can output power through the socket, and can also set a time countdown to disconnect the socket; the countdown timer includes an upper shell 100 and a lower shell 200, the upper shell 100 and the lower shell 200 are buckled, the lower shell 200 is a rectangular shell, a power board 201 is provided in the lower shell 200, a socket head 202, a power circuit and an execution circuit are provided on the power board 201, the socket head 202 is symmetrically electrically connected to both sides of the power board 201, a plug 204 is provided on the bottom surface of the lower shell 200, the plug 204 is electrically connected to the power board 201, the power circuit steps down and stabilizes the AC mains into a DC power supply, and the execution circuit connects or disconnects the power supply to the socket head 202; in the present embodiment, the plug 204 and the socket head 202 are American socket heads, and in some embodiments, the plug 204 and the socket head 202 can also be other standard socket heads 202 such as European standards, French standards, and international standards.

[0025] Eight buttons 101 are symmetrically arranged on the upper shell 100, and each button 101 is provided with an LED lamp bead 102 in the shell. The eight buttons 101 include an on / off button 104, a reset button 105, and a countdown button 106; in this embodiment, the eight-button countdown timer is designed to be rectangular, so the eight buttons 101 are arranged in two rows in contrast; a control board 103 is provided in the upper shell 100, and a control circuit is provided in the control board 103, and the control circuit is electrically connected to the power circuit and the execution circuit respectively, the button 101 inputs a signal to the control circuit, and the control circuit outputs a signal to the execution circuit to control the connection or disconnection of the countdown timer.

[0026] In some embodiments, the upper housing 100 is designed to be trapezoidal for aesthetic reasons.

[0027] In some embodiments, a battery is provided on the power board 201, and the battery supplies power to the control circuit when the power is disconnected to prevent the countdown power information from being lost when the power is disconnected.

[0028] like Figure 4 As shown, the battery is connected to the power circuit point and the output power is used to provide power for the control circuit when there is no AC power. The power circuit includes a rectifier filter circuit and a step-down voltage regulator circuit. The rectifier filter circuit includes a rectifier bridge DB1, a capacitor C1, resistors R1 and R2. The zero line input terminal N of the plug 204 is connected to the resistors R1, R2 and the input pin 1 of the rectifier bridge DB1 in sequence. The capacitor C1 is connected in parallel with the resistor R2 to play a filtering role. The pin 3 of the rectifier bridge DB1 is connected to the live line input terminal L-in of the plug 204. The pin 2 of the rectifier bridge DB1 is used as the output terminal, and the pin 4 of the rectifier bridge DB1 is connected to the ground terminal.

[0029] The step-down voltage stabilizing circuit includes a capacitor C2, a voltage stabilizing diode ZW1, a resistor R4, a voltage stabilizing diode ZW2, and a capacitor C3; the voltage stabilizing diode ZW1 and the capacitor C2 are respectively connected in parallel with the output end of the rectifier bridge DB1. In the embodiment, the capacitor C2 is a polar electrolytic capacitor, the voltage stabilizing diode ZW1 adopts a rated voltage of 12V, and the current limiting resistor R2=560 kilo-ohms. Under the action of the voltage stabilizing diode ZW1 and the current limiting resistor R2, a 12V DC voltage can be stably output.

[0030] Resistor R4 is connected to the 12V DC voltage output terminal, Zener diode ZW2 is connected to resistor R4, the rated voltage of Zener diode ZW2 is 3.6V, and the voltage is further stabilized to 3.6V output, capacitor C3 is connected in parallel with Zener diode ZW2 to protect the 3.6V voltage smooth output, and the 3.6V output terminal is marked with VDD.

[0031] The battery BAT is connected in parallel to the output terminal VDD, and the battery BAT and the output terminal VDD are connected to a resistor R5. When there is no DC voltage output at the output terminal VDD, the battery BAT continues to output to ensure power supply. The output voltage of the battery BAT is 2.4V. To prevent the battery BAT from backflowing, the step-down voltage stabilization circuit is connected in series with a diode D2 at the output terminal VDD.

[0032] In this embodiment, the on-off actuator of the execution circuit is a relay, the input end of the main circuit of relay K1 is connected to the live wire end L-in, the output end of the main circuit of relay K1 is connected to the output end L-out of the socket, one end of the trigger circuit of relay K1 is connected to the 12V voltage, and the other end is connected to the collector of transistor Q1, the emitter of transistor Q1 is grounded, the base of transistor Q1 is connected to resistor R3 and then connected to the signal point relay, and the diode D1 in parallel with the trigger circuit of relay K1 is used to cut off the inductive current protection circuit. When the relay end inputs a high level, transistor Q1 is turned on, the potential difference between the two ends of the trigger circuit of relay K1 is 12V, relay K1 is energized, the main circuit is turned on, the line is turned on, and the socket is connected; when there is no signal input at the relay end, transistor Q1 is cut off, relay K1 is disconnected, the main circuit is disconnected, and the socket is disconnected.

[0033] like Figure 5 As shown, the control board 103 includes a control chip U1, which is a 20-pin single-chip microcomputer. In order to check whether the input AC mains power is powered off, pin 1 of the control chip U1 is connected to the power circuit, and pin 1 is connected to resistor R5 and then connected to resistor R1. The AC mains power is input to the control chip U1 after current limiting by resistor R5; pins 4, 5, 7, 8, 9, and 10 of the control chip are respectively connected to a switch key 104, a reset key 105, and a countdown key 106. In this embodiment, the countdown key 106 includes 6 different countdown gears of 15MIN, 30MIN, 1H, 2H, 4H, and 6H. The 6 countdown gear buttons 101 can be pressed independently. The pressure timing can also be superimposed on the press timing, the switch key 104 is the ON / OFF key, and the reset key 105 is the REPEAT key; at the same time, the pins 11, 12, 13, 14, 18, and 19 of the control chip are respectively connected to the LED lamp beads 102, and the lighting of the LED lamp beads 102 indicates the triggering of the corresponding countdown key 106. The pin 15 of the control chip U1 is the chip power pin connected to the DC voltage output terminal VDD, and the pin 20 of the control chip U1 is used as the signal output pin to output the signal relay to the execution circuit to control the relay to close or open. The pins 16 and 17 of the control chip U1 are connected to the crystal oscillator Y1 as a clock, and the crystal oscillator Y1 is connected to capacitors C5 and C6.

[0034] The control chip U1 detects whether the AC power is input. According to the logic, when there is no AC power, only the clock of the microcontroller is maintained running; when the power key 104, the reset key 105, and the countdown key 106 are pressed, the control chip U1 runs according to the logical recorded data, and when the pin 20 outputs a high level, the relay is driven to make the socket have output. When the clock running time is the same as the time data recorded in the control chip U1, the high level output is stopped and the socket has no output; according to the logic, the LED lamp bead 102 corresponds to the button 101.

[0035] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A countdown timer, used for outputting power to a socket and / or counting down to stop outputting power to a socket, comprising an upper housing (100) and a lower housing (200), characterized in that: A power board (201) is arranged in the lower shell (200), and a socket head (202), a power circuit and an execution circuit are arranged on the power board (201), and a battery is arranged on the power board (201). A plurality of buttons (101) are symmetrically arranged on the upper shell (100), and each button (101) is provided with an LED lamp bead (102) in its shell. A control board (103) is arranged in the upper shell (100), and a control circuit is arranged in the control board (103). The power circuit, the execution circuit and the control circuit are electrically connected respectively; the button (101) inputs a signal to the control circuit, and the control circuit outputs a signal to the execution circuit to control the connection or disconnection of the countdown timer.

2. A countdown timer according to claim 1, characterized in that: The lower shell (200) is a rectangular shell, a plug hole (203) is provided on the side of the lower shell (200), the socket head (202) is symmetrically arranged on both sides of the power board (201) and abuts against the side of the lower shell (200), and the plug hole of the socket head (202) and the plug hole (203) are overlapped and arranged in parallel.

3. A countdown timer according to claim 2, characterized in that: The bottom surface of the lower housing (200) is provided with a plug (204), the plug (204) is electrically connected to the power board (201), and the socket head (202) is electrically connected to the power board (201).

4. A countdown timer according to claim 1, characterized in that: The keys (101) include an on / off key (104), a reset key (105), and a countdown key (106), and the keys (101) are distributed in two parallel rows, upper and lower.

5. A countdown timer according to claim 4, characterized in that: The upper shell (100) is trapezoidal.

6. A countdown timer according to claim 1, characterized in that: The power supply circuit includes a rectifier and filter circuit and a step-down voltage stabilizing circuit. The step-down voltage stabilizing circuit outputs a DC voltage by stabilizing the voltage through a voltage stabilizing diode.

7. A countdown timer according to claim 6, characterized in that: The step-down voltage stabilizing circuit includes a capacitor C2, a Zener diode ZW1, a resistor R4, a Zener diode ZW2, and a capacitor C3. The Zener diode ZW1 is connected in parallel to the output end of the rectifier and filter circuit, the capacitor C2 is connected in parallel to the Zener diode ZW1, and the Zener diode ZW1 outputs a DC voltage through a first-level voltage stabilization; the resistor R4 is connected to the capacitor C2, the Zener diode ZW2 is connected to the resistor R4, the capacitor C3 is connected in parallel to the Zener diode ZW2, and the Zener diode ZW2 outputs a DC voltage through a second-level voltage stabilization.

8. A countdown timer according to claim 7, characterized in that: The step-down voltage stabilizing circuit is connected in parallel with a battery, which is connected to a resistor R5 and then to a secondary voltage stabilizing output terminal.

9. A countdown timer according to claim 1, characterized in that: The execution circuit includes a relay K1, wherein the main circuit input end of the relay K1 is connected to the live wire end L-in, the main circuit output end of the relay K1 is connected to the socket output end L-out, one end of the trigger circuit of the relay K1 is connected to the primary voltage-stabilized output DC voltage, and the other end is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the resistor R3 and then to the signal point relay, and the relay K1 trigger circuit is connected in parallel with a diode D1.

10. A countdown timer according to claim 1, characterized in that: The control circuit includes a control chip U1 that receives and stores key (101) signal data according to program logic operation, and outputs a signal to drive a relay to connect or disconnect the socket.

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