CN214675107U

CN214675107U - Time delay driving circuit for small electric appliance

Info

Publication number: CN214675107U
Application number: CN202120910979.1U
Authority: CN
Inventors: 奥利弗·理查德·纽顿·海明
Original assignee: Ao LifuLichadeNiudunHaiming
Current assignee: Ao LifuLichadeNiudunHaiming
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-11-09
Anticipated expiration: 2031-04-29

Abstract

The utility model discloses a little electrical apparatus time delay drive circuit, including direct current boost circuit, delay circuit and the time delay reset circuit of electricity connection in proper order, be provided with trigger switch SW between direct current boost circuit and the power supply, delay circuit includes delay chip U2, delay chip U2 input with the direct current boost circuit output is connected, be connected with the output indicating circuit between delay chip U2 output and the input, delay chip U2 trigger pin with the time delay reset circuit is connected, external oscillating resistance R2 that is used for adjusting the delay time that has on the delay chip U2. The utility model has the advantages of reasonable design, can control delay time accurately, compare and have higher accuracy nature in common LC delay circuit, compare in single chip microcomputer control system, greatly reduced manufacturing cost has low-power consumption, peripheral circuit simply and the accurate characteristics of time delay.

Description

Time delay driving circuit for small electric appliance

Technical Field

The utility model relates to a delay circuit field especially relates to a little electrical apparatus delay drive circuit.

Background

The common delay circuit is composed of common resistor and capacitor or a singlechip control system is used in small household appliances or electric equipment to try to have the function of a delay switch. The common resistor and capacitor can cause inaccurate time timing, and the delay circuit of the singlechip control system has high cost, complex circuit, higher power consumption and certain defects.

Disclosure of Invention

An object of the utility model is to provide a little electrical apparatus time delay drive circuit can accurately control delay time, has low-power consumption, the simple characteristics of peripheral circuit simultaneously concurrently.

The utility model discloses a realize like this:

the utility model provides a little electrical apparatus time delay drive circuit, is including direct current boost circuit, delay circuit and the time delay reset circuit that electricity is connected in proper order, be provided with trigger switch SW between direct current boost circuit and the power supply, delay circuit includes delay chip U2, delay chip U2 input with the direct current boost circuit output is connected, be connected with output indicating circuit between delay chip U2 output and the input, delay chip U2 trigger pin with the time delay reset circuit is connected, external oscillating resistor R2 that is used for adjusting the delay time that is connected on the delay chip U2.

The delay chip U2 adopts an EC340E-01B type chip.

The direct current boost circuit comprises a direct current boost chip U1, the input end of the direct current boost chip U1 is connected with a trigger switch SW through an inductor L1 and a capacitor C1 filter circuit, and the output end of the direct current boost chip U1 is connected with a filter capacitor C3.

The direct current boost chip U1 adopts a CH1018 type chip.

The time delay reset circuit adopts a transistor switch circuit, the time delay reset circuit comprises a transistor Q1, a collector of the transistor Q1 is connected with a trigger pin of a time delay chip U2, an emitter of the transistor Q1 is grounded, a time delay resistor R3 and a voltage stabilizing diode D1 are connected between the emitter of the transistor Q1 and a base in parallel, and a time delay capacitor C2 is connected between the base of the transistor Q1 and the output end of the direct current boost chip U1.

The output indicating circuit comprises a current limiting resistor R4 and an LED indicating lamp D2, and the current limiting resistor R4 is connected with the LED indicating lamp D2 in series.

The utility model has the advantages of reasonable design, can control delay time accurately, compare and have higher accuracy nature in common LC delay circuit, compare in single chip microcomputer control system, greatly reduced manufacturing cost has low-power consumption, peripheral circuit simply and the accurate characteristics of time delay.

Drawings

Fig. 1 is the whole circuit diagram of the delay driving circuit of the small electric appliance of the present invention.

In the figure, 1, a direct current booster circuit; 2. a delay circuit; 3. a delay reset circuit; 4. an output indication circuit.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

Referring to fig. 1, the small electrical appliance delay driving circuit includes a dc boost circuit 1, a delay circuit 2 and a delay reset circuit 3, which are electrically connected in sequence, wherein a trigger switch SW is arranged between the dc boost circuit 1 and a power supply, the delay circuit 2 includes a delay chip U2, the delay chip U2 is an EC340E-01B chip, an input end of the delay chip U2 is connected with an output end of the dc boost circuit 1, an output indication circuit 4 is connected between an output end and an input end of the delay chip U2, a trigger pin of the delay chip U2 is connected with the delay reset circuit 3, and an oscillation resistor R2 for adjusting delay time is externally connected to the delay chip U2. In the present embodiment, the external connection of the oscillation resistor R2 with different resistance values can accurately adjust the delay time, and the following is a delay time TIMER table corresponding to the oscillation resistor R2 with different resistance values:

the direct-current boost circuit comprises a direct-current boost chip U1, the direct-current boost chip U1 adopts a CH1018 type chip, the input end of the direct-current boost chip U1 is connected with a trigger switch SW through an inductor L1 and a capacitor C1 filter circuit, and the output end of the direct-current boost chip U1 is connected with a filter capacitor C3. In this embodiment, a 1.5V power supply is fed into a dc boost chip U1 through LC filter circuits of L1 and C1, boosted to 3.3V, and generates a stable dc signal through a filter capacitor C2.

The delay reset circuit 3 adopts a transistor switch circuit, the delay reset circuit comprises a transistor Q1, a collector of the transistor Q1 is connected with a trigger pin of a delay chip U2, an emitter of the transistor Q1 is grounded, a delay resistor R3 and a voltage stabilizing diode D1 are connected between the emitter of the transistor Q1 and a base in parallel, and a delay capacitor C2 is connected between the base of the transistor Q1 and the output end of the direct current boost chip U1. In this embodiment, after the trigger switch SW is turned on, the whole circuit is powered on, the delay reset circuit 3 connected to the trigger pin of the delay chip U2 operates, and after passing through the delay circuit of the delay resistor R3 and the delay capacitor C2, the delay capacitor C2 charges, after the charging of the delay capacitor C2 is completed, the voltage across the delay resistor R3 is 0, the transistor Q1 is in an off state, at this time, the trigger pin of the delay chip U2 is at a low level and triggers the start delay core U2 to operate, and the output end outputs a current of a specified time, thereby completing the function of delay output.

The output indicating circuit 4 comprises a current limiting resistor R4 and an LED indicating lamp D2, and the current limiting resistor R4 is connected with the LED indicating lamp D2 in series. In the embodiment, in the process of low-level output of the delay chip U2, a voltage drop exists between the input and the output of the demonstration chip U2, and the delay output can be visually observed through the LED indicator lamp D2.

Compared with the prior art, the utility model discloses following beneficial effect has at least:

the utility model discloses can control delay time accurately, compare and have higher accuracy nature in common LC delay circuit, compare in single chip microcomputer control system, greatly reduced manufacturing cost has low-power consumption, peripheral circuit simply and the accurate characteristics of time delay. The circuit is successfully used for backlight control of the alarm clock on the desktop, and is widely used in hotels and families. The problem that a user does not turn on a lamp in a room when needing to watch time is solved and facilitated, the backlight of the desktop clock is automatically turned on, and the desktop clock is automatically turned off when the preset time is reached.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, therefore, any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A small electric appliance delay driving circuit comprises a direct current booster circuit (1), a delay circuit (2) and a delay reset circuit (3) which are electrically connected in sequence;

the method is characterized in that: be provided with trigger switch SW between direct current boost circuit (1) and the power supply, delay circuit (2) are including delay chip U2, delay chip U2 input with direct current boost circuit (1) output is connected, be connected with output indicating circuit (4) between delay chip U2 output and the input, delay chip U2 trigger pin with delay reset circuit (3) are connected, external oscillating resistance R2 that is used for adjusting the delay time that has on the delay chip U2.

2. The delay driving circuit of small electric appliance according to claim 1, wherein: the delay chip U2 adopts an EC340E-01B type chip.

3. The delay driving circuit of small electric appliance according to claim 1, wherein: the direct current boost circuit comprises a direct current boost chip U1, the input end of the direct current boost chip U1 is connected with a trigger switch SW through an inductor L1 and a capacitor C1 filter circuit, and the output end of the direct current boost chip U1 is connected with a filter capacitor C3.

4. The delay driving circuit of small electric appliance according to claim 3, wherein: the direct current boost chip U1 adopts a CH1018 type chip.

5. The delay driving circuit of small electric appliance according to claim 3, wherein: the delay reset circuit (3) adopts a transistor switch circuit, the delay reset circuit comprises a transistor Q1, the collector of the transistor Q1 is connected with the trigger pin of the delay chip U2, the emitter of the transistor Q1 is grounded, a delay resistor R3 and a voltage stabilizing diode D1 are connected between the emitter of the transistor Q1 and the base in parallel, and a delay capacitor C2 is connected between the base of the transistor Q1 and the output end of the direct current boost chip U1.

6. The delay driving circuit of small electric appliance according to claim 1, wherein: the output indicating circuit (4) comprises a current limiting resistor R4 and an LED indicating lamp D2, and the current limiting resistor R4 is connected with the LED indicating lamp D2 in series.