CN205318129U - Time -delay control circuit - Google Patents

Abstract

The utility model is suitable for a delay circuit technical field provides a time -delay control circuit, include: RC charging and discharging circuit and triode Q2, RC charging and discharging circuit is including parallelly connected zener diode ZD1. The utility model provides a pair of time -delay control circuit utilizes the switching characteristic of triode and electrolytic capacitor's the discharge characteristics that fills to realize the delayed function, reaches the control to the relay simultaneously, and charging and discharging circuit carries out voltage clamp through zener diode, realizes accurate charging voltage control, reaches the control of accurate delay time.

Description

A delay control circuit

technical field

The utility model belongs to the technical field of delay circuits, in particular to a delay control circuit.

Background technique

In the prior art, the delay control circuit is generally implemented by capacitor charging and discharging circuit, timing circuit and single-chip microcomputer control. The timing circuit and single-chip microcomputer control are more accurate in terms of accuracy, but they are also relatively expensive in terms of cost.

The capacitor charging and discharging circuit is only used for filtering or simple time control, and the error is large. For example, in the technical solution disclosed by the name "Delay Circuit" (application number: 201320613697.0, publication date: April 2, 2014), the delay circuit includes an RC charging and discharging circuit, a triode and a MOS tube, and one end of the RC charging and discharging circuit Connect the power supply, and connect the other end to the base and emitter of the triode. After the RC charging and discharging circuit charges for a period of time, the triode and the MOS tube will be turned on. The charging time is enough to be the delay time. The voltage across the capacitor of the charging and discharging circuit is not accurate.

Utility model content

The purpose of the embodiment of the utility model is to provide a delay control circuit, which can at least overcome some defects of the prior art.

A delay control circuit related to an embodiment of the utility model includes: an RC charging and discharging circuit and a triode Q2, and the RC charging and discharging circuit includes a parallel-connected Zener diode ZD1.

As a delay control circuit involved in the first embodiment, the power supply V1 is connected to the RC charging and discharging circuit through the switch ON and the diode D1.

The delay control circuit also includes a drive circuit connected to the collector of the triode Q2;

The drive circuit includes a diode D2 and a relay Ry connected in parallel, the cathode of the diode D2 is connected to the power supply V2, and the anode is connected to the collector of the transistor Q2.

The RC charging and discharging circuit includes: a resistor R3, a resistor R4, a resistor R5, a capacitor C1 and a Zener diode ZD1;

The resistor R4 and the capacitor C1 are connected in parallel with the Zener diode ZD1 after being connected in series;

One end of the resistor R3 is connected to the cathode of the diode D1, and the other end is connected to the cathode of the Zener diode ZD1 and one end of the resistor R4;

The anode of the Zener diode ZD1 and one end of the capacitor C1 are grounded;

The connection point of the resistor R4 and the capacitor C1 is connected to the base of the transistor Q2 through the resistor R5.

The transistor Q2 is an NPN transistor, and the emitter of the transistor Q2 is grounded.

The delay control circuit also includes an interlock circuit connected in parallel with the RC charging and discharging circuit; the interlock circuit includes a resistor R1, a resistor R2 and an NPN transistor Q1;

One end of the resistor R1 is connected to the cathode of the diode D1, and the other end is connected to the base of the triode Q1;

The collector of the transistor Q1 is connected to the base of the transistor Q2, the emitter is grounded, and the resistor R2 is connected between the emitter and the base.

The beneficial effects of a delay control circuit provided by the embodiment of the utility model include:

The delay control circuit provided by the embodiment of the utility model uses the switching characteristics of the triode and the charging and discharging characteristics of the electrolytic capacitor to realize the delay function, and at the same time achieves the control of the relay, and the charging and discharging circuit performs voltage clamping through the Zener diode , to achieve precise charging voltage control, to achieve precise delay time control.

The capacitor realizes the charge and discharge function through the relevant resistors connected in series. Different parameter designs in the RC charge and discharge circuit can achieve different control of discharge time, and realize different delay times according to requirements.

The delay control circuit provided by the embodiment of the utility model also includes an interlock circuit connected in parallel with the RC charging and discharging circuit. The interlock circuit includes a triode Q1 whose collector is connected to the base of the triode Q2 to realize the triode Q1 and the triode Q2. The function of signal interlocking between.

It is convenient for on-off control of automobiles, function delay control, low-voltage to high-voltage switch control, and related series of control systems that require delayed operation control. The circuit design is simple, easy to debug, and transplant applications.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the practical For some novel embodiments, those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is the circuit schematic diagram of the embodiment of a kind of delay control circuit provided by the utility model;

Fig. 2 is a functional signal diagram of an embodiment of a delay control circuit provided by the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In order to illustrate the technical solution described in the utility model, the following specific examples will be used for illustration.

Embodiment one

Embodiment one provided by the utility model is a specific embodiment of a kind of delay control circuit provided by the utility model, as shown in Figure 1 is the circuit principle diagram of the embodiment of the delay control circuit provided by the utility model, by the figure 1 as can be seen, in the embodiment of the delay control circuit provided by the utility model:

A delay control circuit provided by the utility model includes an RC charging and discharging circuit and a triode Q2, wherein the RC charging and discharging circuit includes a parallel-connected voltage stabilizing diode ZD1.

In the delay control circuit provided by the embodiment of the utility model, the RC charging and discharging circuit includes a parallel voltage stabilizing diode, and the voltage stabilizing diode is used for clamping to realize accurate charging voltage control and accurate delay time control. The power supply V1 is connected to the RC charging and discharging circuit through the switch ON and the diode D1. When the switch ON is pressed and disconnected, a high level or a low level is generated. When a high level is generated, the diode D1 conducts in one direction, and transmits the high level to the RC charging and discharging circuit.

Further, the delay control circuit provided by the embodiment of the present invention also includes a drive circuit connected to the collector of the triode Q2, the drive circuit includes a diode D2 and a relay Ry connected in parallel, and the cathode of the diode D2 is connected to the power supply V2 , the positive pole is connected to the collector of the triode Q2.

The diode D2 is a freewheeling diode of the relay Ry, which is used to suppress the reverse electromotive force of the relay Ry, and protect the triode Q2 from being broken down. Two power supplies V1 and V2 are used for power supply, and the two voltages can be the same or different.

The drive circuit mainly uses the triode Q2 to drive and amplify the signal, so as to realize the control of the pull-in and break-off of the relay Ry.

In the embodiment of the present invention, the RC charging and discharging circuit includes: a resistor R3, a resistor R4, a resistor R5, a capacitor C1 and a voltage regulator diode ZD1.

The resistor R4 and the capacitor C1 are connected in parallel with the Zener diode ZD1 after being connected in series. One end of the resistor R3 is connected to the cathode of the diode D1, and the other end is connected to the cathode of the Zener diode ZD1 and one end of the resistor R4. The anode of the Zener diode ZD1 and one end of the capacitor C1 are grounded. The connection point of the resistor R4 and the capacitor C1 is connected to the base of the transistor Q2 through the resistor R5, the transistor Q2 is an NPN transistor, and the emitter of the transistor Q2 is grounded.

When the switch ON is pressed to generate a high level, the resistor R3, resistor R4, Zener diode ZD1 and capacitor C1 connected to the power supply V1 start charging until the stable voltage of the Zener diode ZD1 is reached, and the resistor R4 realizes the charging current. Control; when the switch is turned off, the capacitor C1 discharges through R5, the base and emitter of the transistor Q2, until the voltage of the capacitor C1 is lower than the VBEO voltage of the transistor Q2, and the transistor Q2 is turned on during the discharge, and drives the relay to pull in , to achieve the function of delay control. The delay time can be adjusted through the capacitance value of the capacitor C1, the voltage stabilization value of the Zener diode ZD1, and the parameters of the resistor R5, so as to realize different delay times according to requirements. Fig. 2 is a functional signal diagram of a delay control circuit provided by the utility model.

Further, the delay control circuit provided by the embodiment of the present invention further includes an interlock circuit connected in parallel with the RC charging and discharging circuit. The interlock circuit includes a resistor R1, a resistor R2 and an NPN transistor Q1.

One end of the resistor R1 is connected to the cathode of the diode D1, and the other end is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the base of the transistor Q2, the emitter is grounded, and a resistor R2 is connected between the emitter and the base.

When the switch ON is pressed to generate a high level, the resistors R1 and R2 divide the voltage and limit the current, the transistor Q1 is turned on, the base of the transistor Q2 is connected to the collector of the transistor Q1, and the transistor Q1 pulls down the base of the transistor Q2 At this time, the base of the triode Q2 is at a low voltage, so Q2 is cut off, and the relay Ry is in an off state.

When the switch is turned off, the transistor Q1 is disconnected due to the loss of current at the base, and the transistor Q2 is turned on due to the energy storage and discharge of the capacitor, thereby realizing the function of signal interlock.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (4)

1. a time delay control circuit, said time delay control circuit comprises RC charging and discharging circuit and triode Q2, it is characterized in that, said RC charging and discharging circuit comprises parallel voltage regulator diode ZD1; The delay control circuit also includes a drive circuit connected to the collector of the triode Q2; The drive circuit includes a diode D2 and a relay Ry connected in parallel, the cathode of the diode D2 is connected to the power supply V2, and the anode is connected to the collector of the triode Q2; The RC charging and discharging circuit includes: a resistor R3, a resistor R4, a resistor R5, a capacitor C1 and a Zener diode ZD1; The resistor R4 and the capacitor C1 are connected in parallel with the Zener diode ZD1 after being connected in series; One end of the resistor R3 is connected to the cathode of the diode D1, and the other end is connected to the cathode of the Zener diode ZD1 and one end of the resistor R4; The anode of the Zener diode ZD1 and one end of the capacitor C1 are grounded; The connection point of the resistor R4 and the capacitor C1 is connected to the base of the transistor Q2 through the resistor R5. 2. The delay control circuit according to claim 1, characterized in that the power source V1 is connected to the RC charging and discharging circuit through a switch ON and a diode D1. 3. The delay control circuit according to claim 1, wherein the transistor Q2 is an NPN transistor, and the emitter of the transistor Q2 is grounded. 4. delay control circuit as claimed in claim 2, is characterized in that, described delay control circuit also comprises the interlock circuit connected in parallel with described RC charging and discharging circuit; The interlock circuit includes a resistor R1, a resistor R2 and an NPN transistor Q1; One end of the resistor R1 is connected to the cathode of the diode D1, and the other end is connected to the base of the triode Q1; The collector of the transistor Q1 is connected to the base of the transistor Q2, the emitter is grounded, and the resistor R2 is connected between the emitter and the base.