CN104079158A - Ultra-low static power consumption power source starting control circuit - Google Patents
Ultra-low static power consumption power source starting control circuit Download PDFInfo
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- CN104079158A CN104079158A CN201410320425.0A CN201410320425A CN104079158A CN 104079158 A CN104079158 A CN 104079158A CN 201410320425 A CN201410320425 A CN 201410320425A CN 104079158 A CN104079158 A CN 104079158A
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Abstract
The invention discloses an ultra-low static power consumption power source starting control circuit. The ultra-low static power consumption power source starting control circuit is composed of an isolating circuit, a time delay circuit, a switching circuit and a feedback circuit. The isolating circuit comprises an optical coupler. The time delay circuit comprises an RC charging loop. The switching circuit comprises an audion and a VDMOS tube. The feedback circuit comprises a diode and a feedback resistor. A starting signal is input at the input end to control the optical coupler in the isolating circuit to be conducted. A charging power source is made to provide a power supply for the time delay circuit after the optical coupler is conducted, and the RC charging loop in the time delay circuit is charged. When the output voltage of the time delay circuit reaches to the conduction voltage of the audion in the switching circuit, the audion is conducted, the VDMOS tube is controlled to be conducted, and the output end is made to output the voltage. According to the ultra-low static power consumption power source starting control circuit, a linear voltage regulator and a D trigger are removed, after the circuit is powered on, only a switching device in the cut-off state can work, the static working current of the switching device is nearly 0, and the whole circuit is in the ultra-low static power consumption state. The circuit is small in size, and miniaturization integration is facilitated.
Description
Technical field
The present invention relates to a kind of power supply and open control circuit, particularly a kind of power supply of ultralow quiescent dissipation opens control circuit.
Background technology
It is a kind of circuit with power on function that power supply opens control circuit, is generally installed on battery power supply system, requires to have ultralow quiescent dissipation.Power supply opens control circuit and is made up of circuits for triggering, isolation and power output circuit, delay circuit, feedback circuit, power-switching circuit.Wherein, circuits for triggering are realized by d type flip flop, isolation and power output circuit are realized by power optocoupler, delay circuit is realized by RC charge circuit, feedback circuit is realized by DC/DC module, power-switching circuit is realized by linear voltage regulator,, powers to d type flip flop convert to+5V of circuit supply power supply (20V-36V) power supply by linear voltage regulator.Circuit working process is as follows: first in a start signal of d type flip flop input input, d type flip flop output high level, provides charge power supply to delay circuit, in the time that delay circuit output voltage reaches optocoupler conducting voltage, the conducting of power optocoupler, makes output output voltage.Output output voltage, as the power supply of DC/DC module, makes DC/DC module output+5V level signal.This power supply is received the clear terminal (Low level effective) of d type flip flop through control switch, when control switch is connected, d type flip flop clear terminal input+5V level signal, d type flip flop clear terminal is invalid, d type flip flop maintains output 1, and power take-off maintains output high level.In the time that control switch disconnects ,+5V level signal disconnects, d type flip flop zero clearing, the cut-off of power optocoupler, power take-off no-output.The power supply of this kind of scheme opens control circuit in the time not working (output does not have output voltage), circuit supply power supply (20V-36V) still will be given linear voltage regulator and d type flip flop power supply, the quiescent current of linear voltage regulator and d type flip flop consumption reaches several milliamperes, makes the quiescent dissipation of whole circuit higher; In addition, power optocoupler and DC/DC module volume are larger, and whole circuit is difficult to reach the integrated requirement of miniaturization.
Summary of the invention
Object of the present invention: the present invention opens control circuit structural principle to above-mentioned power supply of the prior art and improves, reaching under the prerequisite of identical function and performance, not only realized ultralow quiescent dissipation, and it is integrated to have realized small size.
The technical solution that realizes the object of the invention is:
The power supply of ultralow quiescent dissipation opens a control circuit, it is characterized in that, is made up of buffer circuit, delay circuit, switching circuit, feedback circuit;
Wherein, buffer circuit comprises the optocoupler being connected with input;
Delay circuit comprises RC charge circuit, is charged to RC charge circuit by the optocoupler control charge power supply in buffer circuit; One control switch is also set on RC charge circuit;
Switching circuit comprises by the triode of delay circuit output voltage control conducting, is managed by the VDMOS of this triode control conducting; The drain electrode of VDMOS pipe is connected to output;
Feedback circuit comprises the diode and the feedback resistance that are connected between VDMOS pipe and RC charge circuit;
Optocoupler conducting in input input start signal control buffer circuit; After optocoupler conducting, make charge power supply provide power supply to delay circuit, the RC charge circuit in delay circuit is charged; In the time that delay circuit output voltage reaches the triode conducting voltage in switching circuit, triode conducting, controls the conducting of VDMOS pipe, makes output output voltage.
In buffer circuit, the light-emitting diode in voltage-stabiliser tube, the 3rd resistance and described optocoupler is in parallel with the second resistance again after connecting successively, and the circuit after parallel connection is connected with first resistance one end again, and the first resistance other end is connected with input.
Input input voltage VIN scope is 20V-34V, and optocoupler is reliable conducting in this voltage range; Optocoupler not conducting in the time of 10V voltage simultaneously;
Set up buffer circuit design calculation formula:
Wherein,
V(R2)＝V
Z+V(R3)+V
T＝V
Z+I
G*R3+V
T (2)
In formula, R1, R2, R3 are respectively the resistance of the first resistance, the second resistance, the 3rd resistance, and V (R1), V (R2), V (R3) are respectively and are carried in the first resistance, the second resistance, the 3rd ohmically voltage, I
gfor optocoupler drive current, V
zfor voltage-stabiliser tube voltage stabilizing value, V
tfor the pressure drop of the light-emitting diode in optocoupler;
If when input voltage VIN=20V, optocoupler drive current I
gfor 5mA;
When input voltage VIN=34V, optocoupler drive current I
gfor 15mA;
When input voltage VIN=15V, drive current I when optocoupler critical conduction
gfor 0.6mA;
And by these three groups of numerical value substitution formula (1), (2), solve the resistance of the first resistance, the second resistance, the 3rd resistance.
In delay circuit, charge power supply VCC is connected to the photosensitive semiconductor pipe collector of optocoupler in buffer circuit through the 4th resistance; The photosensitive semiconductor pipe emitter of optocoupler is through the 5th grounding through resistance; The photosensitive semiconductor pipe emitter of optocoupler is simultaneously through described control switch, charging capacitor ground connection; One end that control switch is connected with charging capacitor is connected in switching circuit after the 6th resistance, the 8th electric resistance partial pressure.
In switching circuit, the collector electrode of triode is connected to charge power supply VCC through the 9th resistance, the tenth resistance; The grounded emitter of triode; The base stage of triode is connected in delay circuit, by the conducting of delay circuit control triode; The grid of VDMOS pipe is connected to the common contact of the 9th resistance and the tenth resistance; The source electrode of VDMOS pipe is connected to charge power supply VCC; The drain electrode of VDMOS pipe is connected to output.
In feedback circuit, the positive pole of diode is connected to the drain electrode of VDMOS pipe through feedback resistance, and the negative pole of diode is connected to wherein one end of described control switch, and the described control switch wherein other end is connected with charging capacitor C.
The advantage of the invention and the effect reaching:
With respect to scheme of the prior art, this circuit has been cancelled linear voltage regulator and d type flip flop, after circuit powers on, only there is the switching device work in cut-off state, its static working current is almost 0 (<1 μ A), the operating state of whole circuit in ultralow quiescent dissipation.In addition, cancelled larger power optocoupler and the DC/DC module of volume, whole circuit area narrows down to 11mm*16mm by 30mm*40mm, dwindled nearly 7 times, thereby it is integrated to realize miniaturization.
Brief description of the drawings
Fig. 1 power supply opens control circuit schematic diagram;
Fig. 2 buffer circuit schematic diagram;
Fig. 3 transfer ratio and drive current graph of a relation;
Fig. 4 delay circuit schematic diagram;
Fig. 5 switching circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
This power supply opens control circuit and is made up of buffer circuit, delay circuit, switching circuit, feedback circuit, as shown in Figure 1.Wherein, buffer circuit is realized by optocoupler N1 and peripheral circuit thereof, delay circuit is realized by RC charge circuit, and switching circuit is realized by switch triode V3 and VDMOS pipe V2, and feedback circuit is realized by diode V4 and the feedback resistance R7 with forward conduction, reverse cutoff function.
Circuit working process is as follows: first in a start signal of input IN input, optocoupler N1 conducting, provide charge power supply to delay circuit, in the time that delay circuit output voltage reaches triode V3 conducting voltage, triode V3 conducting, make VDMOS pipe V2GS end (grid source electrode) produce cut-in voltage, VDMOS pipe V2S end (source electrode) and (drain electrode) conducting of D end, make output OUT output voltage VO UT.Lower mask body is introduced the design process of each several part circuit.
1. buffer circuit design
Buffer circuit as shown in Figure 2, comprises the resistance R 1 being connected with input IN; Light-emitting diode in voltage-stabiliser tube V1, resistance R 3 and optocoupler N1 is in parallel with resistance R 2 again after connecting successively, and the circuit after parallel connection is connected with resistance R 1 again.
Input IN input voltage VIN scope is 20V-34V, requires optocoupler N1 within the scope of this to realize reliable conducting; Not conducting of optocoupler N1 when while VIN=10V.Buffer circuit is realized isolation by optocoupler N1, and isolation voltage reaches 2500V.The drive current of input optocoupler is larger, and the degree of saturation of optocoupler is darker, pressure drop V between optocoupler 3,4 pin
cEless.When general drive current >5mA, to reach the degree of depth saturated for optocoupler, now V
cEabout 0.2V, pressure drop V between 1,2 pin
tabout 1.1V.Optocoupler N1 also has an important parameter---transfer ratio, and the transfer ratio of optocoupler is larger, and the efficiency of transmission of optocoupler is higher, and load capacity is stronger.The transfer ratio of optocoupler N1 and the relation of drive current are as shown in Figure 3.
As seen from Figure 3, the transfer ratio of optocoupler and drive current are not linear relationships, and the value of drive current is transfer ratio maximum in the time of 5mA-15mA, are more satisfactory the design of the value of optocoupler drive current within the scope of 5mA-15mA.Therefore,, when VIN=20V, drive current is designed to 5mA; When VIN=34V, drive current is designed to 15mA (drive current when VIN=34V is larger, and drive current when VIN=20V is also larger, and optocoupler degree of saturation is darker); When VIN=15V, optocoupler is designed to critical conduction mode (the about 0.6mA of critical conduction electric current), while guaranteeing VIN=10V, reliably end, and reliable conducting when VIN=20V.V1 is voltage-stabiliser tube, and establishing its voltage stabilizing value is V
z; If the drive current of input optocoupler is I
g; Have:
Wherein,
V(R2)＝V
Z+V(R3)+V
T＝V
Z+I
G*R3+V
T (2)
VIN=34V, I
g=15mA; VIN=20V, I
g=5mA; VIN=15V, I
g=0.6mA substitution formula (1), (2), can solve resistance R 1, R2, R3.
2. delay circuit design
The effect of delay circuit is the on off state of control switch circuit, and carries out filtering to opening signal hair thorn, as shown in Figure 4.Photosensitive semiconductor pipe collector in optocoupler N1 is connected to charge power supply VCC through resistance R 4; Photosensitive semiconductor pipe emitter in optocoupler N1 is through resistance R 5 ground connection.Photosensitive semiconductor pipe emitter in optocoupler N1 is simultaneously through control switch S1, capacitor C ground connection.Ground connection after one end that control switch S1 is connected with capacitor C is connected with resistance R 6, R8 simultaneously.
Control switch S1 is for whether output voltage VO UT of control output end OUT.When control switch S1 connects, when input start signal, the photosensitive semiconductor pipe conducting in optocoupler N1, charge power supply VCC charges to capacitor C, when the charging voltage in resistance R 8 reaches the conducting voltage (about 0.7V) of triode V3, triode V3 conducting, power supply opens control circuit output.When control switch S1 turn-offs, the charge power supply of charge circuit is cut off, and power supply opens control circuit no-output.In order to prevent that the burr in start signal from carrying out false triggering to circuit, while requiring start signal pulsewidth <10ms, power supply opens control circuit no-output; When start signal pulsewidth >50ms, power supply opens control circuit output.Charge constant is RC, wherein R=((R6+R8) //R5) //R4.VCC scope is 20V-36V, and in the time of VCC=20V, charging rate is slower, now requires charging interval <50ms; In the time of VCC=36V, charging rate is very fast, now requires charging interval >10ms.According to designing suitable electric capacity, resistance value to the requirement in charging interval.Because the optocoupler degree of depth is saturated, the pressure drop VCE between photosensitive semiconductor pipe collector, the emitter including can ignore.The photosensitive semiconductor tube leakage current that optocoupler includes is extremely low, when optocoupler cut-off, there is no that electric current flows through.This just ensures that circuit, in the time not working (output does not have output voltage), does not consume the electric current of charge power supply VCC.
3. switching circuit design
Switching circuit as shown in Figure 5, comprises triode V3 and VDMOS pipe V2, and VDMOS pipe V2 is the field effect transistor of P raceway groove.The collector electrode of triode V3 is connected to charge power supply VCC through resistance R 9, R10; The grounded emitter of triode V3; The base stage of triode V3 is connected to the ungrounded one end of resistance R 8 in delay circuit.The grid of VDMOS pipe V2 is connected to the tie point of resistance R 9 and resistance R 10; The source electrode of VDMOS pipe V2 is connected to charge power supply VCC; The drain electrode of VDMOS pipe V2 is connected to output OUT.
In the time that charging circuit voltage V (R8) reaches triode V3 conducting voltage (about 0.7V), triode V3 conducting, make VDMOS pipe GS end (grid source electrode) produce cut-in voltage, VDMOS pipe S end (source electrode) and (drain electrode) conducting of D end, make output OUT output voltage VO UT, and High-current output is provided.In Fig. 5, triode V3 selects common small power switch triode, and saturation conduction pressure drop is very little, can ignore.It is withstand voltage should be greater than the maximum voltage 36V of charge power supply VCC.When triode V3 cut-off, leakage current is extremely low, there is no that electric current flows through.VDMOS pipe V2 selects the power MOS pipe with High-current output ability, and its output current can reach tens peaces, its conducting resistance <1 Ω, and conduction voltage drop is very little.It is withstand voltage should be greater than the maximum voltage 36V of charge power supply VCC.When VDMOS pipe V2 cut-off, leakage current is extremely low, there is no that electric current flows through.When the abundant conducting of VDMOS pipe V2, its grid voltage between source electrodes is 10V～20V, i.e., when triode V3 conducting, V (R10)=10V～20V, can design the value of suitable resistance R 9, R10 accordingly.
4. feedback circuit design
Feedback circuit is realized by diode V4 and the resistance R 7 with forward conduction, reverse cutoff function, as shown in Figure 1.The positive pole of diode V4 is connected to the drain electrode of VDMOS pipe V2 through resistance R 7, the negative pole of diode V4 is connected to wherein one end of control switch S1, and the control switch S1 wherein other end is connected with capacitor C.
In the time that control switch S1 connects, when input start signal, output output voltage.It is upper that output output voltage is applied to charging capacitor C by diode V4 and resistance R 7 loops, even if now cancel start signal, output voltage still can charge to capacitor C by feedback loop, makes output maintain output.When control switch S1 disconnects, feedback loop disconnects the charge circuit of capacitor C, and VDMOS manages cut-off, output no-output.When control switch S1 disconnects, when input start signal, diode V4 can effectively end start signal, prevents that start signal from channeling to output, load circuit is carried out to false triggering.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (7)
1. the power supply of ultralow quiescent dissipation opens a control circuit, it is characterized in that, is made up of buffer circuit, delay circuit, switching circuit, feedback circuit;
Wherein, buffer circuit comprises the optocoupler being connected with input;
Delay circuit comprises RC charge circuit, is charged to RC charge circuit by the optocoupler control charge power supply in buffer circuit; One control switch is also set on RC charge circuit;
Switching circuit comprises by the triode of delay circuit output voltage control conducting, is managed by the VDMOS of this triode control conducting; The drain electrode of VDMOS pipe is connected to output;
Feedback circuit comprises the diode and the feedback resistance that are connected between VDMOS pipe and RC charge circuit;
Optocoupler conducting in input input start signal control buffer circuit; After optocoupler conducting, make charge power supply provide power supply to delay circuit, the RC charge circuit in delay circuit is charged; In the time that delay circuit output voltage reaches the triode conducting voltage in switching circuit, triode conducting, controls the conducting of VDMOS pipe, makes output output voltage.
2. the power supply of ultralow quiescent dissipation according to claim 1 opens control circuit, it is characterized in that, in buffer circuit, light-emitting diode in voltage-stabiliser tube, the 3rd resistance and described optocoupler is in parallel with the second resistance again after connecting successively, circuit after parallel connection is connected with first resistance one end again, and the first resistance other end is connected with input.
3. the power supply of ultralow quiescent dissipation according to claim 2 opens control circuit, it is characterized in that,
Input input voltage VIN scope is 20V-34V, and optocoupler is reliable conducting in this voltage range; Optocoupler not conducting in the time of 10V voltage simultaneously;
Set up buffer circuit design calculation formula:
Wherein,
V(R2)＝V
Z+V(R3)+V
T＝V
Z+I
G*R3+V
T (2)
In formula, R1, R2, R3 are respectively the resistance of the first resistance, the second resistance, the 3rd resistance, and V (R1), V (R2), V (R3) are respectively and are carried in the first resistance, the second resistance, the 3rd ohmically voltage, I
gfor optocoupler drive current, V
zfor voltage-stabiliser tube voltage stabilizing value, V
tfor the pressure drop of the light-emitting diode in optocoupler.
4. the power supply of ultralow quiescent dissipation according to claim 3 opens control circuit, it is characterized in that,
If when input voltage VIN=20V, optocoupler drive current I
gfor 5mA;
When input voltage VIN=34V, optocoupler drive current I
gfor 15mA;
When input voltage VIN=15V, drive current I when optocoupler critical conduction
gfor 0.6mA;
And by these three groups of numerical value substitution formula (1), (2), solve the resistance of the first resistance, the second resistance, the 3rd resistance.
5. the power supply of ultralow quiescent dissipation according to claim 1 and 2 opens control circuit, it is characterized in that, in delay circuit, charge power supply VCC is connected to the photosensitive semiconductor pipe collector of optocoupler in buffer circuit through the 4th resistance; The photosensitive semiconductor pipe emitter of optocoupler is through the 5th grounding through resistance; The photosensitive semiconductor pipe emitter of optocoupler is simultaneously through described control switch, charging capacitor ground connection; One end that control switch is connected with charging capacitor is connected in switching circuit after the 6th resistance, the 8th electric resistance partial pressure.
6. the power supply of ultralow quiescent dissipation according to claim 1 opens control circuit, it is characterized in that, in switching circuit, the collector electrode of triode is connected to charge power supply VCC through the 9th resistance, the tenth resistance; The grounded emitter of triode; The base stage of triode is connected in delay circuit, by the conducting of delay circuit control triode; The grid of VDMOS pipe is connected to the common contact of the 9th resistance and the tenth resistance; The source electrode of VDMOS pipe is connected to charge power supply VCC; The drain electrode of VDMOS pipe is connected to output.
7. the power supply of ultralow quiescent dissipation according to claim 5 opens control circuit, it is characterized in that, in feedback circuit, the positive pole of diode is connected to the drain electrode of VDMOS pipe through feedback resistance, the negative pole of diode is connected to wherein one end of described control switch, and the described control switch wherein other end is connected with charging capacitor C.
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| CN105162328A (en) * | 2015-08-27 | 2015-12-16 | 苏州华兴源创电子科技有限公司 | Metal oxide semiconductor (MOS) tube power switch circuit free of dead-time voltage |
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| CN105162328B (en) * | 2015-08-27 | 2018-08-31 | 苏州华兴源创电子科技有限公司 | A kind of metal-oxide-semiconductor power switch circuit of no dead zone voltage |
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| CN112039321A (en) * | 2020-07-14 | 2020-12-04 | 宁波安信数控技术有限公司 | Power-on and power-off locking protection circuit of servo driver IGBT module |
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| CN112217179A (en) * | 2020-10-23 | 2021-01-12 | 北京精密机电控制设备研究所 | Switch and protection circuit for exoskeleton robot |
| CN112217179B (en) * | 2020-10-23 | 2022-12-27 | 北京精密机电控制设备研究所 | Switch and protection circuit for exoskeleton robot |
| CN117439236A (en) * | 2023-12-18 | 2024-01-23 | 深圳市卓芯微科技有限公司 | Isolation circuit and method of charging contact of beauty instrument and beauty instrument |
| CN117439236B (en) * | 2023-12-18 | 2024-03-29 | 深圳市卓芯微科技有限公司 | Isolation circuit and method of charging contact of beauty instrument and beauty instrument |
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Application publication date: 20141001 |