CN201789482U - Delay circuit - Google Patents

Abstract

The utility model is applicable to the electronic field, and provides a delay circuit which comprises a constant-current source circuit with the function of temperature compensation. The delay circuit comprises the constant-current source circuit with the function of temperature compensation, thus enabling the delay time not to be influenced by temperature or change violently in a wide temperature range, therefore, the delay circuit has extremely high temperature stability and delay accuracy, and simultaneously, the computation and deduction are simple, and the cost of the circuit is low.

Description

A kind of delay circuit

Technical field

The utility model belongs to electronic applications, relates in particular to a kind of delay circuit.

Background technology

Delay circuit generally is used for the time-delay of some enabling signals, as: timing switch machine circuit, guard delay circuit, start delay circuit etc.Generally require time of delay long in the timing switch machine circuit, dozens of minutes has to several hrs, and can adjust the time of delay that requires that has; In the guard delay circuit; generally be in order to prevent that protective circuit is influenced and misoperation by interference signal, postpone behind the certain hour guard signal and still exist and then enter guard mode that this application conditions is generally fixed value following time of delay; the time that postpones is shorter, generally arrives between second at millisecond.

At present, Chang Yong delay circuit generally has attribute delay circuit and RC delay circuit two classes.Numeration type delay circuit utilizes oscillator to produce the one-period clock signal, utilizes the numeration circuit that clock pulse is counted, the signal when numeration reaches preset value after the output time-delay.This delay circuit can postpone for a long time, and can conveniently set time of delay, and its precision and stability depend primarily on oscillator, can select the circuit structure of different qualities as required for use, but its circuit cost is higher.The RC delay circuit generally is to utilize on the electric capacity voltage with the variation in charging interval, signal after voltage reaches preset value after the output delay, this delay circuit is owing to be subjected to the delay that the restriction of capacitance and change in voltage scope generally only is used for the short time, and be difficult for time of delay in use adjusting, relatively be suitable in short-term, use in the delay circuit of set time, has advantage cheaply comparing with top scheme aspect the delay in short-term, but its shortcoming is: first: calculation of complex, the charging voltage of RC circuit is pressed index law and is risen, and can't finish with simple computation.Second: it is bigger that the voltage detecting circuit that needs high-temperature stability denys that temperature is floated, and the voltage detecting circuit of high-temperature stability brings the increase of cost to lose advantage.

Fig. 1 shows the structure of existing a kind of delay circuit, delay circuit comprises storage capacitor C2, triode Q8 and triode Q9, the operation principle of this delay circuit is: when input signal becomes high level, storage capacitor C2 is recharged, when the voltage of storage capacitor C2 reaches the conducting voltage of triode Q8, and triode Q8 conducting, and meanwhile, triode Q9 ends, and the collector electrode of triode Q9 becomes high level, and promptly the output signal of delay circuit becomes high level.It is exactly the material time that delay circuit produces time-delay, i.e. time of delay that voltage on the storage capacitor C2 is charged to the needed time of triode Q8 conducting voltage from zero.

Owing to varying with temperature, the conducting voltage of triode Q8 changes, under its normal temperature about 0.7V, when range of temperature reaches-40 ℃～+ 100 ℃, its conducting voltage changes between the 1.1V at 0.4V, like this, temperature can badly influence the time of delay of delay circuit, thereby has influence on delay precision, the temperature stability of delay circuit.Simultaneously, because the restriction of base drive electric current, also can be restricted the time of delay of circuit, its calculating also relative complex of deriving.

Comprehensive above-mentioned existing delay circuit, it exists circuit delay precision temperature influence, delay time to calculate derive complicated, circuit cost problem of higher respectively.

The utility model content

The purpose of this utility model is to provide a kind of delay circuit, is intended to solve existing delay circuit and exists temperature can have influence on the delay precision of delay circuit, and calculate derive complicated, cost problem of higher.

The utility model is to realize like this, a kind of delay circuit, described delay circuit comprises storage capacitor C1 and triode Q3, described triode Q3 is a NPN type triode, the first termination signal input part of described storage capacitor C1, the second end ground connection of described storage capacitor C1, the base stage of described triode Q3 connects first end of described storage capacitor C1, the collector electrode of described triode Q3 connects power supply and signal output part simultaneously, the grounded emitter of described triode Q3, and described delay circuit also comprises:

Be serially connected between the tie point of base stage of first end of described signal input part and storage capacitor C1 and triode Q3, the time of delay that makes described delay circuit is the constant-current source circuit with temperature-compensating of temperature influence not.

In the said structure, the constant-current source circuit with temperature-compensating comprises:

Resistance R 3, resistance R 4, first switch element, second switch element and the 3rd switch element;

Second end of described first switch element connects first end of signal input part and resistance R 3 simultaneously, the 3rd end of described first switch element is unsettled, first end of the first termination second switch element of described first switch element, the 3rd end of described second switch element is unsettled, second end of described second switch element is leaded up to resistance R 4 ground connection, another road of second end of described second switch element connects first end of the 3rd switch element, second end of the described resistance R 3 of second termination of described the 3rd switch element, first end of the described storage capacitor C1 of the 3rd termination of described the 3rd switch element.

In the said structure, first switch element is triode Q5, described triode Q5 is the positive-negative-positive triode, the base stage of described triode Q5 is first end of first switch element, the emission of described triode Q5 is second end of first switch element very, and the current collection of described triode Q5 is the 3rd end of first switch element very.

In the said structure, the second switch element is triode Q6, described triode Q6 is a NPN type triode, the base stage of described triode Q6 is first end of second switch element, the emission of described triode Q6 is second end of second switch element very, and the current collection of described triode Q6 is the 3rd end of second switch element very.

In the said structure, the 3rd switch element is triode Q2, described triode Q2 is the positive-negative-positive triode, the base stage of described triode Q2 is first end of the 3rd switch element, the emission of described triode Q2 is second end of the 3rd switch element very, and the current collection of described triode Q2 is the 3rd end of the 3rd switch element very.

In the said structure, the constant-current source circuit with temperature-compensating comprises:

Resistance R 3, resistance R 4, diode D1 and triode Q2, described triode Q2 is the positive-negative-positive triode;

The negative electrode of described diode D1 connects first end of signal input part and resistance R 3 simultaneously, first end of the anode while connecting resistance R4 of described diode D1 and the base stage of triode Q2, second end of the emitter connecting resistance R3 of described triode Q2, the collector electrode of described triode Q2 connects first end of storage capacitor C1, the second end ground connection of described resistance R 4.

In the said structure, the constant-current source circuit with temperature-compensating comprises:

Thermistor RT1, resistance R 4, diode D1 and triode Q2, described triode Q2 is the positive-negative-positive triode;

The negative electrode of described diode D1 connects first end of signal input part and thermistor RT1 simultaneously, first end of the anode while connecting resistance R4 of described diode D1 and the base stage of triode Q2, the emitter of described triode Q2 connects second end of thermistor RT1, the collector electrode of described triode Q2 connects first end of storage capacitor C1, the second end ground connection of described resistance R 4.

In the said structure, the constant-current source circuit with temperature-compensating comprises:

Resistance R 3, resistance R 4, diode D1, diode D2 and triode Q2, described triode Q2 is the positive-negative-positive triode;

The anode of described diode D1 connects first end of signal input part and resistance R 3 simultaneously, the negative electrode of described diode D1 connects the anode of diode D2, first end of the negative electrode while connecting resistance R4 of described diode D2 and the base stage of triode Q2, second end of the emitter connecting resistance R3 of described triode Q2, the collector electrode of described triode Q2 connects first end of storage capacitor C1, the second end ground connection of described resistance R 4.

In the said structure, delay circuit also comprises the driving output circuit, the power supply termination power of described driving output circuit, the drive output of described driving output circuit and signal input part connect base stage and the collector electrode of described triode Q3 respectively, the signal output part of described driving output circuit connects described signal output part, the earth terminal ground connection of described driving output circuit.

In the said structure, drive circuit comprises:

The 4th switch element, the 5th switch element, resistance R 1, resistance R 2 and resistance R 5;

First end of described the 4th switch element is first end, the collector electrode of triode Q3 and first end of the 5th switch element of connecting resistance R5 simultaneously, the base stage of the 3rd termination triode Q3 of described the 4th switch element, second end of the second terminating resistor R5 of described the 4th switch element, second end of described resistance R 5 connects power supply by resistance R 1, first termination power of described resistance R 2, second end of described resistance R 2 connects the 3rd end and the signal output part of the 5th switch element simultaneously, the second end ground connection of described the 5th switch element;

Described the 4th switch element is triode Q4, described triode Q4 is the positive-negative-positive triode, the base stage of described triode Q4 is first end of the 4th switch element, the emission of described triode Q4 is second end of the 4th switch element very, and the current collection of described triode Q4 is the 3rd end of the 4th switch element very;

Described the 5th switch element is triode Q1, described triode Q1 is a NPN type triode, the base stage of described triode Q1 is first end of the 5th switch element, the emission of described triode Q1 is second end of the 5th switch element very, and the current collection of described triode Q1 is the 3rd end of the 5th switch element very.

In the utility model, delay circuit comprises the constant-current source circuit with temperature-compensating, makes the time of delay of the temperature influence not of delay circuit, and in very wide temperature range, change little the time of delay of delay circuit, therefore has very high delay precision.Simultaneously, its calculating derivation is simple, circuit cost is low.

Description of drawings

Fig. 1 is the structure chart of existing delay circuit;

Fig. 2 is the structure chart of the delay circuit that provides of the utility model embodiment;

Fig. 3 is the exemplary circuit figure of the delay circuit that provides of the utility model first embodiment;

Fig. 4 is the exemplary circuit figure of the delay circuit that provides of the utility model second embodiment;

Fig. 5 is the exemplary circuit figure of the delay circuit that provides of the utility model the 3rd embodiment;

Fig. 6 is the exemplary circuit figure of the delay circuit that provides of the utility model the 4th embodiment.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Fig. 2 shows the structure of the delay circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment.

Delay circuit comprises storage capacitor C1 and triode Q3, triode Q3 is a NPN type triode, the first termination signal input part of storage capacitor C1, the second end ground connection of storage capacitor C1, the base stage of triode Q3 connects first end of storage capacitor C1, the collector electrode of triode Q3 connects power supply VCC and signal output part simultaneously, the grounded emitter of triode Q3, delay circuit also comprises the constant-current source circuit 100 with temperature-compensating, constant-current source circuit 100 with temperature-compensating is serially connected between the tie point of base stage of first end of signal input part and storage capacitor C1 and triode Q3, and the time of delay that makes delay circuit is temperature influence not.

As the utility model one embodiment, delay circuit also comprises driving output circuit 200, drive the power supply termination power VCC of output circuit 200, drive the drive output of output circuit 200 and base stage and the collector electrode that signal input part meets triode Q3 respectively, the signal output part that drives output circuit 200 connects signal output part, drives the earth terminal ground connection of output circuit 200.

Fig. 3 shows the exemplary circuit structure of the delay circuit that the utility model first embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment.

As the utility model one embodiment, the constant-current source circuit 100 with temperature-compensating comprises:

Resistance R 3, resistance R 4, first switch element 101, second switch element 102 and the 3rd switch element 103;

Second end of first switch element 101 connects first end of signal input part and resistance R 3 simultaneously, the 3rd end of first switch element 101 is unsettled, first end of the first termination second switch element 102 of first switch element 101, the 3rd end of second switch element 102 is unsettled, second end of second switch element 102 is leaded up to resistance R 4 ground connection, another road of second end of second switch element 102 connects first end of the 3rd switch element 103, second end of the second terminating resistor R3 of the 3rd switch element 103, first end of the 3rd termination storage capacitor C1 of the 3rd switch element 103.

As the utility model one embodiment, first switch element 101 is triode Q5, triode Q5 is the positive-negative-positive triode, the base stage of triode Q5 is first end of first switch element 101, the emission of triode Q5 is second end of first switch element 101 very, and the current collection of triode Q5 is the 3rd end of first switch element 101 very.

As the utility model one embodiment, second switch element 102 is triode Q6, triode Q6 is a NPN type triode, the base stage of triode Q6 is first end of second switch element 102, the emission of triode Q6 is second end of second switch element 102 very, and the current collection of triode Q6 is the 3rd end of second switch element 102 very.

As the utility model one embodiment, the 3rd switch element 103 is triode Q2, triode Q2 is the positive-negative-positive triode, the base stage of triode Q2 is first end of the 3rd switch element 103, the emission of triode Q2 is second end of the 3rd switch element 103 very, and the current collection of triode Q2 is the 3rd end of the 3rd switch element 103 very.

As the utility model one embodiment, drive output circuit 200 and comprise:

The 4th switch element 201, the 5th switch element 202, resistance R 1, resistance R 2 and resistance R 5;

First end of the 4th switch element 201 is first end, the collector electrode of triode Q3 and first end of the 5th switch element 202 of connecting resistance R5 simultaneously, the base stage of the 3rd termination triode Q3 of the 4th switch element 201, second end of the second terminating resistor R5 of the 4th switch element 201, second end of resistance R 5 meets power supply VCC by resistance R 1, the first termination power VCC of resistance R 2, second end of resistance R 2 connects the 3rd end and the signal output part of the 5th switch element 202 simultaneously, the second end ground connection of the 5th switch element 202.

As the utility model one embodiment, the 4th switch element 201 is triode Q4, triode Q4 is the positive-negative-positive triode, the base stage of triode Q4 is first end of the 4th switch element 201, the emission of triode Q4 is second end of the 4th switch element 201 very, and the current collection of triode Q4 is the 3rd end of the 4th switch element 201 very.

As the utility model one embodiment, the 5th switch element 202 is triode Q1, triode Q1 is a NPN type triode, the base stage of triode Q1 is first end of the 5th switch element 202, the emission of triode Q1 is second end of the 5th switch element 202 very, and the current collection of triode Q1 is the 3rd end of the 5th switch element 202 very.

Fig. 4 shows the exemplary circuit structure of the delay circuit that the utility model second embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment.

As the utility model one embodiment, the constant-current source circuit 100 with temperature-compensating comprises:

Resistance R 3, resistance R 4, diode D1 and triode Q2, triode Q2 are the positive-negative-positive triode;

The negative electrode of diode D1 connects first end of signal input part and resistance R 3 simultaneously, first end of the anode while connecting resistance R4 of diode D1 and the base stage of triode Q2, second end of the emitter connecting resistance R3 of triode Q2, the collector electrode of triode Q2 connects first end of storage capacitor C1, the second end ground connection of resistance R 4.

Because the structure of the driving output circuit 200 that present embodiment provides is the same with the structure of the driving output circuit 200 that first embodiment provides, therefore repeat no more here.

Fig. 5 shows the exemplary circuit structure of the delay circuit that the utility model the 3rd embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment.

As the utility model one embodiment, the constant-current source circuit 100 with temperature-compensating comprises:

Thermistor RT1, resistance R 4, diode D1 and triode Q2, triode Q2 are the positive-negative-positive triode;

The negative electrode of diode D1 connects first end of signal input part and thermistor RT1 simultaneously, first end of the anode while connecting resistance R4 of diode D1 and the base stage of triode Q2, the emitter of triode Q2 connects second end of thermistor RT1, the collector electrode of triode Q2 connects first end of storage capacitor C1, the second end ground connection of resistance R 4.

Because the structure of the driving output circuit 200 that present embodiment provides is the same with the structure of the driving output circuit 200 that first embodiment provides, therefore repeat no more here.

Fig. 6 shows the exemplary circuit structure of the delay circuit that the utility model the 4th embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment.

As the utility model one embodiment, the constant-current source circuit 100 with temperature-compensating comprises:

Resistance R 3, resistance R 4, diode D1, diode D2 and triode Q2, triode Q2 are the positive-negative-positive triode;

The anode of diode D1 connects first end of signal input part and resistance R 3 simultaneously, the negative electrode of diode D1 connects the anode of diode D2, first end of the negative electrode while connecting resistance R4 of diode D2 and the base stage of triode Q2, second end of the emitter connecting resistance R3 of triode Q2, the collector electrode of triode Q2 connects first end of storage capacitor C1, the second end ground connection of resistance R 4.Wherein, diode D1, diode D2 have the uniform temp coefficient with triode Q2, triode Q3 respectively.

Because the structure of the driving output circuit 200 that present embodiment provides is the same with the structure of the driving output circuit 200 that first embodiment provides, therefore repeat no more here.

The delay circuit that provides with first embodiment is an example below, and the operation principle of delay circuit is described:

Resistance R 3, resistance R 4, triode Q2, triode Q5 and triode Q6 have constituted the constant-current source circuit 100 with temperature-compensating, its operation principle is, when control signal when being high, the forward conducting of emitter of two connect triode Q5 and triode Q6, electric current flows to ground from resistance R 4, produce pressure drop separately this moment on two emitters, this pressure drop equals the emitter voltage drop of triode conducting, establishes pressure drop here and is respectively VBE (Q5) and VBE (Q6).And an other branch road resistance R 3 satisfies such relation here: the VBE pressure drop of triode Q2 add pressure drop on the resistance R3 equal the later pressure drop of two transistor emitters series connection and:

That is: VBE (Q2)+VR3=VBE (Q5)+VBE (Q6)

: VR3=VBE (Q5)+VBE (Q6)-VBE (Q2)

Again since under stable case VBE (Q5), VBE (Q6) and VBE (Q2) be steady state value therefore:

VR3 is a steady state value, both the voltage on the resistance R 3 was steady state value, the electric current that flows through resistance R 3 so also is a steady state value, and the electric current that flows through resistance R 3 is exactly the Ie electric current of triode Q2, because Ie ≈ Ic, so Ic also is steady state value, so just obtained a constant-current source circuit and given storage capacitor C1 charging, its continuous current is Ic, can get:

$I_C=\frac{V_{R3}}{{\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="HDA0000025084630000021.png,HDA0000025084630000022.png"\; state="\{\{state\}\}">R</figure-callout>}}_3}=\frac{V_{\mathrm{BE}\left(Q5\right)}+V_{\mathrm{BE}\left(Q6\right)}-V_{\mathrm{BE}\left(Q2\right)}}{{\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="HDA0000025084630000021.png,HDA0000025084630000022.png"\; state="\{\{state\}\}">R</figure-callout>}}_3}$ ...?...?...?...?...?...?...①

When continuous current was given storage capacitor C1 charging, the voltage on the storage capacitor C1 rose by simple linear rule.When the voltage on the electric capacity reaches the conducting voltage of triode Q3, triode Q3 conducting.Voltage on the storage capacitor C1 is charged to the material time that the needed time of triode Q3 conducting voltage is exactly delay circuit generation time-delay from zero like this.Here can obtain:

${\mathrm{<figure-callout\; id="1"\; label="V\; C"\; filenames="HDA0000025084630000021.png,HDA0000025084630000022.png"\; state="\{\{state\}\}">V</figure-callout>}}_C=\frac{I_{\mathrm{<figure-callout\; id="1"\; label="C\; t\; C"\; filenames="HDA0000025084630000021.png,HDA0000025084630000022.png"\; state="\{\{state\}\}">C</figure-callout>}}t}{C_{}},$ Then time of delay, t was: $t=\frac{C_1\mathrm{<figure-callout\; id="1"\; label="V\; I\; C"\; filenames="HDA0000025084630000021.png,HDA0000025084630000022.png"\; state="\{\{state\}\}">V</figure-callout>}}{I_C}$ ...?...?...?...?...?②

Annotate:

IC1: constant current charge electric current;

V: triode Q3 conducting voltage VBE (Q3);

C1: storage capacitor C1 capacity;

In addition owing to be subjected to the voltage clamp effect of the VBE of triode Q3, this moment, storage capacitor C1 voltage stopped to rise, the constant-current source electric current all flows into triode Q3 base stage, make triode Q3 produce collector current, because the constant-current source electric current need be adjusted as requested, differing guarantees that surely triode Q3 enters saturated, therefore increases triode Q4 driving tube.When triode Q3 has conducting a little, the collector current of triode Q3 flows through the base stage of triode Q4, this electric current is offered triode Q3 again by the collector current that triode Q4 amplifies back generation triode Q4, become the base current of triode Q3, the very fast conducting of triode Q3 like this, and enter saturation condition.Therefore the adding of triode Q4 has improved the flexibility of continuous current design, has also improved range of application.

Triode Q1 realizes output, and the effect of triode Q1 is a phase overturn, and making input signal and output signal all is high level signal.Can use the opener electrode in addition as required instead and export or open forms such as drain electrode output.

The Synthesis principle explanation:

Convolution 1. with formula 2., just can derive this delay circuit time of delay t relation because the charging current of storage capacitor C1 equals the collector current of triode Q2, therefore can get t time of delay:

$t=\frac{C_1\mathrm{<figure-callout\; id="1"\; label="V\; I\; C"\; filenames="HDA0000025084630000021.png,HDA0000025084630000022.png"\; state="\{\{state\}\}">V</figure-callout>}}{I_C}=\frac{C_1{V}_{\mathrm{BE}\left(Q3\right)}}{\frac{V_{\mathrm{BE}\left(Q5\right)}+V_{\mathrm{BE}\left(Q6\right)}-V_{\mathrm{BE}\left(Q2\right)}}{{\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="HDA0000025084630000021.png,HDA0000025084630000022.png"\; state="\{\{state\}\}">R</figure-callout>}}_3}}=\frac{C_1{V}_{\mathrm{BE}\left(Q3\right)}{R}_3}{V_{\mathrm{BE}\left(Q5\right)}+V_{\mathrm{BE}\left(Q6\right)}-V_{\mathrm{BE}\left(Q2\right)}}$ ...③

We select triode Q5, the triode Q2 of same model and triode Q6, the triode Q3 of same model for use in circuit, their pressure drop and temperature coefficient are all equal substantially like this, just have: 3. VBE (Q5) ≈ VBE (Q2), VBE (Q6) ≈ VBE (Q3) then formula just can abbreviation be:

t＝C ₁R ₃..........④

Final like this result is that t of time of delay is relevant with resistance R 3 with storage capacitor C1, has not been subjected to the influence of other parameter.It equates substantially through this circuit actual delay time of experimental verification and calculating, and temperature is when-40 ℃～+ 120 ℃ range, and the variable quantity of minimax time of delay also can be controlled in 5% the accuracy rating.

In the utility model embodiment, delay circuit comprises the constant-current source circuit with temperature-compensating, make the time of delay of the temperature influence not of delay circuit, again since reasonably select element make time of delay only with the relating to parameters of resistance and electric capacity, therefore aspect has improved the temperature stability of circuit, another aspect has improved the delay precision of circuit, calculates and derives simply, and circuit cost is low.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims (10)

1. delay circuit, described delay circuit comprises storage capacitor C1 and triode Q3, described triode Q3 is a NPN type triode, the first termination signal input part of described storage capacitor C1, the second end ground connection of described storage capacitor C1, the base stage of described triode Q3 connects first end of described storage capacitor C1, the collector electrode of described triode Q3 connects power supply and signal output part simultaneously, the grounded emitter of described triode Q3 is characterized in that, described delay circuit also comprises:

Be serially connected between the tie point of base stage of first end of described signal input part and storage capacitor C1 and triode Q3, the time of delay that makes described delay circuit is the constant-current source circuit with temperature-compensating of temperature influence not.

2. delay circuit as claimed in claim 1 is characterized in that, described constant-current source circuit with temperature-compensating comprises:

Resistance R 3, resistance R 4, first switch element, second switch element and the 3rd switch element;

Second end of described first switch element connects first end of signal input part and resistance R 3 simultaneously, the 3rd end of described first switch element is unsettled, first end of the first termination second switch element of described first switch element, the 3rd end of described second switch element is unsettled, second end of described second switch element is leaded up to resistance R 4 ground connection, another road of second end of described second switch element connects first end of the 3rd switch element, second end of the described resistance R 3 of second termination of described the 3rd switch element, first end of the described storage capacitor C1 of the 3rd termination of described the 3rd switch element.

3. delay circuit as claimed in claim 2, it is characterized in that, described first switch element is triode Q5, described triode Q5 is the positive-negative-positive triode, the base stage of described triode Q5 is first end of first switch element, the emission of described triode Q5 is second end of first switch element very, and the current collection of described triode Q5 is the 3rd end of first switch element very.

4. delay circuit as claimed in claim 2, it is characterized in that, described second switch element is triode Q6, described triode Q6 is a NPN type triode, the base stage of described triode Q6 is first end of second switch element, the emission of described triode Q6 is second end of second switch element very, and the current collection of described triode Q6 is the 3rd end of second switch element very.

5. delay circuit as claimed in claim 2, it is characterized in that, described the 3rd switch element is triode Q2, described triode Q2 is the positive-negative-positive triode, the base stage of described triode Q2 is first end of the 3rd switch element, the emission of described triode Q2 is second end of the 3rd switch element very, and the current collection of described triode Q2 is the 3rd end of the 3rd switch element very.

6. delay circuit as claimed in claim 1 is characterized in that, described constant-current source circuit with temperature-compensating comprises:

Resistance R 3, resistance R 4, diode D1 and triode Q2, described triode Q2 is the positive-negative-positive triode;

The negative electrode of described diode D1 connects first end of signal input part and resistance R 3 simultaneously, first end of the anode while connecting resistance R4 of described diode D1 and the base stage of triode Q2, second end of the emitter connecting resistance R3 of described triode Q2, the collector electrode of described triode Q2 connects first end of storage capacitor C1, the second end ground connection of described resistance R 4.

7. delay circuit as claimed in claim 1 is characterized in that, described constant-current source circuit with temperature-compensating comprises:

Thermistor RT1, resistance R 4, diode D1 and triode Q2, described triode Q2 is the positive-negative-positive triode;

The negative electrode of described diode D1 connects first end of signal input part and thermistor RT1 simultaneously, first end of the anode while connecting resistance R4 of described diode D1 and the base stage of triode Q2, the emitter of described triode Q2 connects second end of thermistor RT1, the collector electrode of described triode Q2 connects first end of storage capacitor C1, the second end ground connection of described resistance R 4.

8. delay circuit as claimed in claim 1 is characterized in that, described constant-current source circuit with temperature-compensating comprises:

Resistance R 3, resistance R 4, diode D1, diode D2 and triode Q2, described triode Q2 is the positive-negative-positive triode;

The anode of described diode D1 connects first end of signal input part and resistance R 3 simultaneously, the negative electrode of described diode D1 connects the anode of diode D2, first end of the negative electrode while connecting resistance R4 of described diode D2 and the base stage of triode Q2, second end of the emitter connecting resistance R3 of described triode Q2, the collector electrode of described triode Q2 connects first end of storage capacitor C1, the second end ground connection of described resistance R 4.

9. delay circuit as claimed in claim 1, it is characterized in that, described delay circuit also comprises the driving output circuit, the power supply termination power of described driving output circuit, the drive output of described driving output circuit and signal input part connect base stage and the collector electrode of described triode Q3 respectively, the signal output part of described driving output circuit connects described signal output part, the earth terminal ground connection of described driving output circuit.

10. delay circuit as claimed in claim 9 is characterized in that, described driving output circuit comprises:

The 4th switch element, the 5th switch element, resistance R 1, resistance R 2 and resistance R 5;

First end of described the 4th switch element is first end, the collector electrode of triode Q3 and first end of the 5th switch element of connecting resistance R5 simultaneously, the base stage of the 3rd termination triode Q3 of described the 4th switch element, second end of the second terminating resistor R5 of described the 4th switch element, second end of described resistance R 5 connects power supply by resistance R 1, first termination power of described resistance R 2, second end of described resistance R 2 connects the 3rd end and the signal output part of the 5th switch element simultaneously, the second end ground connection of described the 5th switch element;

Described the 4th switch element is triode Q4, described triode Q4 is the positive-negative-positive triode, the base stage of described triode Q4 is first end of the 4th switch element, the emission of described triode Q4 is second end of the 4th switch element very, and the current collection of described triode Q4 is the 3rd end of the 4th switch element very;

Described the 5th switch element is triode Q1, described triode Q1 is a NPN type triode, the base stage of described triode Q1 is first end of the 5th switch element, the emission of described triode Q1 is second end of the 5th switch element very, and the current collection of described triode Q1 is the 3rd end of the 5th switch element very.

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