CN204615628U - Multistage negative pressure generating circuit - Google Patents
Multistage negative pressure generating circuit Download PDFInfo
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- CN204615628U CN204615628U CN201520348437.4U CN201520348437U CN204615628U CN 204615628 U CN204615628 U CN 204615628U CN 201520348437 U CN201520348437 U CN 201520348437U CN 204615628 U CN204615628 U CN 204615628U
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Abstract
The utility model discloses a multistage negative pressure generating circuit, which comprises a PWM control unit, a primary negative pressure generating unit and a secondary negative pressure generating circuit formed by connecting N secondary negative pressure generating units in series; n is greater than or equal to 1; the PWM output end of the PWM control unit is connected with the input end of the primary negative pressure generating unit; and the input end of the secondary negative pressure generating circuit is connected with the output end of the primary negative pressure generating unit. Through at the output of elementary negative pressure production unit connect N secondary negative pressure production units in series, can produce different negative pressure values simultaneously to the chronogenesis is easier to control, and circuit structure is simpler, and the cost is lower.
Description
Technical field
The utility model relates to electronic circuit technology field, is specifically related to a kind of multi-stage negative pressure and produces circuit.
Background technology
At present, electronic product is extensively present in daily life, arrives vehicle appliance greatly, little of computer telephone, and the life for people brings service greatly and facility.
In existing electronic product, usually only have a kind of input voltage, but in circuit, modules required voltage is different, which results in whole circuit and there is several voltage simultaneously, also need negative pressure sometimes.Such as, in LCD MODULE, multiple negative pressure may be needed to carry out the switch of driven MOS pipe.
But negative voltage of the prior art is all control respectively to produce, and namely each negative voltage needs to produce by with to its corresponding circuit for generating negative voltage, result in sequential and be difficult to control, circuit structure is very complicated and cost is very high.
Utility model content
The purpose of this utility model is, provides a kind of multi-stage negative pressure to produce circuit, can produce different negative voltages simultaneously, sequential is more easily controlled, and circuit structure is more simple, and cost is lower.
For solving above technical problem, the utility model embodiment provides a kind of multi-stage negative pressure to produce circuit, comprises PWM control unit, elementary negative pressure generation unit and by N number of secondary negative pressure generation unit secondary negative voltage generating circuit in series; N is more than or equal to 1;
The PWM output of described PWM control unit is connected with the input of described elementary negative pressure generation unit;
The input of described secondary negative voltage generating circuit is connected with the output of described elementary negative pressure generation unit.
Wherein, elementary negative pressure generation unit is for generation of the negative pressure of the first order, simultaneously the negative pressure of the first order is input to described secondary negative voltage generating circuit, afterwards the secondary negative pressure generation unit of each can export a negative pressure value, thus different negative pressure value can be produced simultaneously.
Preferably, described elementary negative pressure generation unit comprises the first electric capacity, the first diode, the second diode and the second electric capacity; The first end of described first electric capacity is the input of described elementary negative pressure generation unit; The positive pole of described first diode is connected with the second end of described first electric capacity; The minus earth of described first diode; The negative pole of described second diode is connected with the second end of described first electric capacity; The output of the just very described elementary negative pressure generation unit of described second diode; The first end of described second electric capacity is connected with the negative pole of described first diode; Second end of described second electric capacity is connected with the positive pole of described second diode.
Preferably, described secondary negative pressure generation unit comprises the first resistance and the first voltage stabilizing didoe; The first end of described first resistance is the input of described secondary negative pressure generation unit; Second end of described first resistance is connected with the positive pole of described first voltage stabilizing didoe, and as the output of described secondary negative pressure generation unit; The minus earth of described first voltage stabilizing didoe.Wherein, described first resistance, for generation of pressure reduction, makes the output voltage of the secondary negative pressure generation unit of the output voltage of this secondary negative pressure generation unit and upper level different; Described first voltage stabilizing didoe is used for clamper.
Preferably, described secondary negative pressure generation unit also comprises the 3rd electric capacity; Described 3rd electric capacity is in parallel with described first voltage stabilizing didoe, for filtering.
Preferably, described 3rd electric capacity is electrochemical capacitor or ceramic condenser.
Preferably, described multi-stage negative pressure generation circuit also comprises series voltage stabilizing unit; Described series voltage stabilizing units in series is between the output of described elementary negative pressure generation unit and the input of described secondary negative voltage generating circuit.
Preferably, described series voltage stabilizing unit comprises the 4th electric capacity, the second resistance, the 3rd resistance, the 4th resistance, the first switching tube and second switch pipe; The first end of described second resistance is connected with the output of described elementary negative pressure generation unit; Second end of described second resistance is by described 4th capacity earth; The first end of described first switching tube is connected with the first end of described second resistance; Second end of described first switching tube is connected with the second end of described second resistance, and is connected with the first end of described second switch pipe; 3rd end of described first switching tube successively by described 3rd resistance and described 4th grounding through resistance, and is connected with the input of described secondary negative voltage generating circuit; Second end ground connection of described second switch pipe; 3rd end of described second switch pipe is connected with the tie point of described 3rd resistance and described 4th resistance.Described series voltage stabilizing unit is triode series voltage stabilizing unit, thus the voltage being input to described secondary negative pressure generation unit can be made more stable, and the electric current of input can be amplified, increase driving force, when needs realize multi-stage negative pressure generation, solve the problem of driving force deficiency.
Preferably, described first switching tube is PNP type triode; The first end of described first switching tube is the collector electrode of triode, and the second end is the base stage of triode, and the 3rd end is the emitter of triode; Described second switch pipe is PNP type triode; The first end of described second switch pipe is the collector electrode of triode, and the second end is emitter, and the 3rd end is base stage.
Preferably, described multi-stage negative pressure generation circuit also comprises RC filter unit; The input of described RC filter unit is connected with the output of described secondary negative voltage generating circuit.Described RC filter unit can the interference noise introduced by input of filtering, eliminating the harmful effect that the shake because producing during external input point action causes, playing level and smooth ripple voltage effect
Preferably, described RC filter unit comprises the 5th resistance and the 5th electric capacity; The input of RC filter unit described in the first end of described 5th resistance; Second end of described 5th resistance is by described 5th capacity earth; Second end of described 5th resistance is the output of described RC filter unit.
Preferably, described PWM control unit comprises MC34063 chip, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first inductance, the 6th electric capacity, the 7th electric capacity and the 3rd diode; 6 pin of described MC34063 chip are the DC voltage input end of described PWM control unit, and it is connected to 7 pin of described MC34063 chip by described 6th resistance; 7 pin of described MC34063 chip are connected to 8 pin of described MC34063 chip by described 7th resistance, and are connected to 1 pin of described MC34063 chip by described first inductance; 1 pin of described MC34063 chip is via described 3rd diode, described 6th capacity earth; The DC voltage output end of the just very described PWM control unit of described 6th electric capacity, and by described 8th resistance and the 9th grounding through resistance; Described 8th resistance is connected with 5 pin of described MC34063 chip with the contact of the 9th resistance; 2 pin of described MC34063 chip, 4 pin ground connection, 3 pin of described MC34063 chip are by described 7th capacity earth; Wherein, 1 pin of described MC34063 chip is the PWM output of described PWM control unit.The present embodiment adopts MC34063 chip and peripheral circuit composition pwm chip thereof, and the PWM ripple that the oscillator that make use of the inside of MC34063 chip produces, can produce another direct voltage simultaneously, reach multiplexing effect.
Compared to prior art, the beneficial effect that a kind of multi-stage negative pressure of the utility model embodiment produces circuit is: a kind of multi-stage negative pressure of the utility model embodiment produces circuit, comprises PWM control unit, elementary negative pressure generation unit and by N number of secondary negative pressure generation unit secondary negative voltage generating circuit in series; N is more than or equal to 1; The PWM output of described PWM control unit is connected with the input of described elementary negative pressure generation unit; The input of described secondary negative voltage generating circuit is connected with the output of described elementary negative pressure generation unit.Wherein, the secondary negative pressure generation unit of every one-level can export a negative pressure value, thus can produce different negative pressure value simultaneously.By the N number of secondary negative pressure generation unit of output series connection at described elementary negative pressure generation unit, can produce different negative pressure value, and sequential more easily controls, circuit structure is more simple, and cost is lower simultaneously.
Accompanying drawing explanation
Fig. 1 is the theory diagram of a kind of multi-stage negative pressure generation circuit that the utility model embodiment provides;
Fig. 2 is the circuit diagram of the elementary negative pressure generation unit in Fig. 1;
Fig. 3 is the circuit diagram of the secondary negative pressure generation unit in Fig. 1;
Fig. 4 is the circuit diagram of the multi-stage negative pressure generation circuit of the utility model embodiment;
Fig. 5 is the circuit diagram of the PWM control unit in Fig. 1.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, its a kind of multi-stage negative pressure being the utility model embodiment provides produces the theory diagram of circuit.Multi-stage negative pressure that the utility model embodiment provides produces circuit, comprises PWM control unit 11, elementary negative pressure generation unit 12 and by N number of secondary negative pressure generation unit secondary negative voltage generating circuit 13 in series; N is more than or equal to 1.Described N number of secondary negative pressure generation unit represents with 131 ~ 13N in FIG.
The PWM output of described PWM control unit 11 is connected with the input of described elementary negative pressure generation unit 12;
The input of described secondary negative voltage generating circuit 13 is connected with the output of described elementary negative pressure generation unit 12.
Wherein, described elementary negative pressure generation unit 12 exports elementary negative voltage V0, and is input to the input of first level negative pressure generation unit 131; First time level negative pressure generation unit 131 exports first level negative voltage V1, and is input to second subprime negative pressure generation unit 132; Second subprime negative pressure generation unit 132 exports second subprime negative voltage V2.By that analogy, while last level negative pressure generation unit exports a road negative voltage, also as the input voltage of next secondary negative pressure generation unit.The secondary negative pressure generation unit of every one-level can export a negative pressure value, when there is N number of secondary negative pressure generation unit, described multi-stage negative pressure produces circuit can produce the individual different negative voltage (comprising the negative voltage that elementary negative pressure generation unit 12 produces) of N+1.
Refer to Fig. 2, it is the circuit diagram of the elementary negative pressure generation unit 12 in Fig. 1.Described elementary negative pressure generation unit 12 comprises the first electric capacity C1, the first diode D1, the second diode D2 and the second electric capacity C2; The first end of described first electric capacity C1 is the input of described elementary negative pressure generation unit 12; The positive pole of described first diode D1 is connected with second end of described first electric capacity C1; The minus earth of described first diode D1; The negative pole of described second diode D2 is connected with second end of described first electric capacity C1; The output of the just very described elementary negative pressure generation unit 12 of described second diode D2; The first end of described second electric capacity C2 is connected with the negative pole of described first diode D1; Second end of described second electric capacity C2 is connected with the positive pole of described second diode D2.
Refer to Fig. 3, it is the circuit diagram of the secondary negative pressure generation unit in Fig. 1.Described secondary negative pressure generation unit comprises the first resistance R1, the first voltage stabilizing didoe ZD1 and the 3rd electric capacity C3; The first end of described first resistance R1 is the input of described secondary negative pressure generation unit; Second end of described first resistance R1 is connected with the positive pole of described first voltage stabilizing didoe ZD1, and as the output of described secondary negative pressure generation unit; The minus earth of described first voltage stabilizing didoe ZD1; Described 3rd electric capacity C3 is in parallel with described first voltage stabilizing didoe ZD1.Wherein, described first resistance R1, for generation of pressure reduction, makes the output voltage of the secondary negative pressure generation unit of the output voltage of this secondary negative pressure generation unit and upper level different; Described first voltage stabilizing didoe ZD1 is used for clamper; Described 3rd electric capacity C3 is used for filtering, can be electrochemical capacitor or ceramic condenser.
It should be noted that, although the circuit structure of each secondary negative pressure generation unit is the same, the parameter of each device specifically in each secondary negative pressure generation unit can be different.Such as the resistance of described first resistance R1 can be different in the size of different secondary negative pressure generation unit.
Refer to Fig. 4, it is the circuit diagram of the multi-stage negative pressure generation circuit of the utility model embodiment.In order to concise explanation, in the utility model embodiment, described secondary negative voltage generating circuit 13 includes two secondary negative pressure generation unit, represents with first level negative pressure generation unit 131 and second subprime negative pressure generation unit 132.In described first level negative pressure generation unit 131, resistance R11 represents the first resistance R1, and voltage stabilizing didoe ZD11 represents the first voltage stabilizing didoe ZD1, and electric capacity C31 represents the 3rd electric capacity C3; In described second subprime negative pressure generation unit 132, resistance R12 represents the first resistance R1, and voltage stabilizing didoe ZD12 represents the first voltage stabilizing didoe ZD1, and electric capacity C32 represents the 3rd electric capacity C3.
Preferably, described multi-stage negative pressure generation circuit also comprises series voltage stabilizing unit 14; Described series voltage stabilizing unit 14 is connected between the output of described elementary negative pressure generation unit 12 and the input of described secondary negative voltage generating circuit 13.
Preferably, described series voltage stabilizing unit 14 comprises the 4th electric capacity C4, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first switching tube Q1 and second switch pipe Q2; The first end of described second resistance R2 is connected with the output of described elementary negative pressure generation unit 12; Second end of described second resistance R2 is by described 4th electric capacity C4 ground connection; The first end of described first switching tube Q1 is connected with the first end of described second resistance R2; Second end of described first switching tube Q1 is connected with second end of described second resistance R2, and is connected with the first end of described second switch pipe Q2; 3rd end of described first switching tube Q1 successively by described 3rd resistance R3 and described 4th resistance R4 ground connection, and is connected with the input of described secondary negative voltage generating circuit 13; The second end ground connection of described second switch pipe Q2; 3rd end of described second switch pipe Q2 is connected with the tie point of described 3rd resistance R3 and described 4th resistance R4.Described series voltage stabilizing unit 14 is triode series voltage stabilizing unit 14, thus the voltage being input to described secondary negative pressure generation unit can be made more stable, and the electric current of input can be amplified, increase driving force, when needs realize multi-stage negative pressure generation, solve the problem of driving force deficiency.
Preferably, described first switching tube Q1 is PNP type triode; The first end of described first switching tube Q1 is the collector electrode of triode, and the second end is the base stage of triode, and the 3rd end is the emitter of triode; Described second switch pipe Q2 is PNP type triode; The first end of described second switch pipe Q2 is the collector electrode of triode, and the second end is emitter, and the 3rd end is base stage.
Preferably, described multi-stage negative pressure generation circuit also comprises RC filter unit 15; The input of described RC filter unit 15 is connected with the output of described secondary negative voltage generating circuit 13.Described RC filter unit 15 can the interference noise introduced by input of filtering, eliminating the harmful effect that the shake because producing during external input point action causes, playing level and smooth ripple voltage effect
Preferably, described RC filter unit 15 comprises the 5th resistance R5 and the 5th electric capacity C5; The input of RC filter unit 15 described in the first end of described 5th resistance R5; Second end of described 5th resistance R5 is by described 5th electric capacity C5 ground connection; Second end of described 5th resistance R5 is the output of described RC filter unit 15.
As shown in Figure 5, it is the circuit diagram of described PWM control unit 11 in the present embodiment.It should be noted that, one of function of described PWM control unit 11 produces PWM ripple, is not limited to the circuit structure shown in Fig. 5.
Described PWM control unit 11 comprises MC34063 chip, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the first inductance L 1, the 6th electric capacity C6, the 7th electric capacity C7 and the 3rd diode D3; 6 pin of described MC34063 chip are the DC voltage input end of described PWM control unit, and it is connected to 7 pin of described MC34063 chip by described 6th resistance R6; 7 pin of described MC34063 chip are connected to 8 pin of described MC34063 chip by described 7th resistance R7, and are connected to 1 pin of described MC34063 chip by described first inductance L 1; 1 pin of described MC34063 chip is via described 3rd diode D3, described 6th electric capacity C6 ground connection; The DC voltage output end of the just very described PWM control unit of described 6th electric capacity C6, and by described 8th resistance R8 and the 9th resistance R9 ground connection; Described 8th resistance R8 is connected with 5 pin of described MC34063 chip with the contact of the 9th resistance R9; 2 pin of described MC34063 chip, 4 pin ground connection, 3 pin of described MC34063 chip are by described 7th electric capacity C7 ground connection; Wherein, 1 pin of described MC34063 chip is the PWM output of described PWM control unit.
When switching tube in chip (T1) conducting, direct current power source voltage is through 1 pin of the 6th resistance R6, the first inductance L 1, MC34063 and 2 pin ground connection, now the first inductance L 1 starts stored energy, and provides energy by the 6th electric capacity C6 to load (not shown in FIG.).When T1 disconnects, direct current power source voltage and the first inductance L 1 provide energy to load and the 6th electric capacity C6 simultaneously.First inductance L 1 is releasing energy period, and because the electromotive force polarity at its two ends is identical with DC power polarity, be equivalent to two power sources in series, the voltage thus load obtained is higher than supply voltage.The frequency of switching tube conducting and shutoff is called the operating frequency of chip.As long as the time constant of this frequency relative load is enough high, load just can obtain continuous print direct voltage.
The inverting input (pin 5) of the comparator of MC34063 inside monitors output voltage by external 8th resistance R8, the 9th resistance R9.Wherein, output voltage Vout=1.25 (1+R2/R1) is only relevant with R1, R2 numerical value by the known output voltage of formula, because 1.25V is reference voltage, invariable.If R1, R2 resistance is stablized, Vout also stablizes.Pin 5 voltage and internal reference voltage 1.25V send into internal comparator simultaneously and carry out voltage compare.When the magnitude of voltage of pin 5 is lower than internal reference voltage (1.25V), comparator exports as leaping voltage, open the S pin control gate of R-S trigger, R-S trigger is under the driving of internal oscillator, Q end is one state (high level), driving tube T2 conducting, switch transistor T 1 also conducting, input voltage vin is charged to improve Vout to the 6th electric capacity C6, reaches the effect that control Vout is stable automatically.When the magnitude of voltage of pin 5 is higher than internal reference voltage (1.25V), the S pin control gate of R-S trigger is blocked, and Q end is " 0 " state (low level), and T2 ends, and T1 also ends.Ipk input (pin 7) of oscillator, for monitoring the peak current of switch transistor T 1, outputs to the Q end of R-S trigger with the pulse controlling oscillator.The size of the capacitance of the 7th electric capacity C7 required for the external oscillator of pin 3 determines the height of oscillator frequency, the also make-and-break time of determine switch pipe T1.
Thus, the present embodiment make use of the impulse wave that MC34063 booster circuit internal oscillator exports, and as the input signal of elementary negative pressure generation unit 12, and can produce another D.C. regulated power supply simultaneously, can reach multiplexing effect.Therefore utilize MC34063 not only can export multi-stage negative pressure as PWM control unit in the present embodiment, positive voltage source can also be exported.
The principle of the multi-stage negative pressure generation circuit of the utility model embodiment is as follows: PWM control unit 11 is to described elementary negative pressure generation unit 12 output pwm signal, when described pwm signal is high level VDD, described pwm signal charges to described first electric capacity C1, voltage on described first electric capacity C1 is pwm signal high level voltage size VDD, and the loop of electric current is pwm signal → the first electric capacity C1 → the first diode D1 → ground; When pwm signal is low level, described first electric capacity C1 is discharged to described second electric capacity C2 by described second diode D2, namely described first electric capacity C1 charges to described second electric capacity C2, described second electric capacity C2 is being just-VDD under negative on the voltage that fills, is namely exporting as-VDD in described second electric capacity C2 upper end.When PWM control unit 11 with the first electric capacity C1 described in higher FREQUENCY CONTROL to described second electric capacity C2 discharge and recharge time, described elementary negative pressure generation unit 12 just can negative voltage after output transform.When the negative voltage that elementary negative pressure generation unit 12 produces is input to first secondary generation unit, after the filtering of the step-down of the first resistance R1, the voltage stabilizing of the first voltage stabilizing didoe ZD1 and the 3rd electric capacity C3, thus first secondary generation unit can produce the negative voltage different from elementary negative voltage.The negative voltage produced, again through the secondary generation unit of next stage, in like manner produces again different negative voltages.By the N number of secondary negative pressure generation unit of output series connection at described elementary negative pressure generation unit 12, different negative pressure value can be produced simultaneously, when needs change output voltage values, only need change the resistance of the first resistance, make circuit structure simple more flexibly, and sequential more easily controls, cost is lower.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (10)
1. multi-stage negative pressure produces a circuit, it is characterized in that, comprises PWM control unit, elementary negative pressure generation unit and by N number of secondary negative pressure generation unit secondary negative voltage generating circuit in series; N is more than or equal to 1;
The PWM output of described PWM control unit is connected with the input of described elementary negative pressure generation unit;
The input of described secondary negative voltage generating circuit is connected with the output of described elementary negative pressure generation unit.
2. multi-stage negative pressure as claimed in claim 1 produces circuit, and it is characterized in that, described elementary negative pressure generation unit comprises the first electric capacity, the first diode, the second diode and the second electric capacity;
The first end of described first electric capacity is the input of described elementary negative pressure generation unit; The positive pole of described first diode is connected with the second end of described first electric capacity; The minus earth of described first diode; The negative pole of described second diode is connected with the second end of described first electric capacity; The output of the just very described elementary negative pressure generation unit of described second diode; The first end of described second electric capacity is connected with the negative pole of described first diode; Second end of described second electric capacity is connected with the positive pole of described second diode.
3. multi-stage negative pressure as claimed in claim 1 produces circuit, and it is characterized in that, described secondary negative pressure generation unit comprises the first resistance and the first voltage stabilizing didoe; The first end of described first resistance is the input of described secondary negative pressure generation unit; Second end of described first resistance is connected with the positive pole of described first voltage stabilizing didoe, and as the output of described secondary negative pressure generation unit; The minus earth of described first voltage stabilizing didoe.
4. multi-stage negative pressure as claimed in claim 3 produces circuit, and it is characterized in that, described secondary negative pressure generation unit also comprises the 3rd electric capacity; Described 3rd electric capacity is in parallel with described first voltage stabilizing didoe.
5. multi-stage negative pressure as claimed in claim 1 produces circuit, it is characterized in that, described multi-stage negative pressure produces circuit and also comprises series voltage stabilizing unit; Described series voltage stabilizing units in series is between the output of described elementary negative pressure generation unit and the input of described secondary negative voltage generating circuit.
6. multi-stage negative pressure as claimed in claim 5 produces circuit, and it is characterized in that, described series voltage stabilizing unit comprises the 4th electric capacity, the second resistance, the 3rd resistance, the 4th resistance, the first switching tube and second switch pipe; The first end of described second resistance is connected with the output of described elementary negative pressure generation unit; Second end of described second resistance is by described 4th capacity earth; The first end of described first switching tube is connected with the first end of described second resistance; Second end of described first switching tube is connected with the second end of described second resistance, and is connected with the first end of described second switch pipe; 3rd end of described first switching tube successively by described 3rd resistance and described 4th grounding through resistance, and is connected with the input of described secondary negative voltage generating circuit; Second end ground connection of described second switch pipe; 3rd end of described second switch pipe is connected with the tie point of described 3rd resistance and described 4th resistance.
7. multi-stage negative pressure as claimed in claim 6 produces circuit, and it is characterized in that, described first switching tube is PNP type triode; The first end of described first switching tube is the collector electrode of triode, and the second end is the base stage of triode, and the 3rd end is the emitter of triode; Described second switch pipe is PNP type triode; The first end of described second switch pipe is the collector electrode of triode, and the second end is emitter, and the 3rd end is base stage.
8. multi-stage negative pressure as claimed in claim 1 produces circuit, it is characterized in that, described multi-stage negative pressure produces circuit and also comprises RC filter unit; The input of described RC filter unit is connected with the output of described secondary negative voltage generating circuit.
9. multi-stage negative pressure as claimed in claim 8 produces circuit, and it is characterized in that, described RC filter unit comprises the 5th resistance and the 5th electric capacity; The input of RC filter unit described in the first end of described 5th resistance; Second end of described 5th resistance is by described 5th capacity earth; Second end of described 5th resistance is the output of described RC filter unit.
10. the multi-stage negative pressure as described in claim as arbitrary in claim 1 to 9 produces circuit, it is characterized in that, described PWM control unit comprises MC34063 chip, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first inductance, the 6th electric capacity, the 7th electric capacity and the 3rd diode; 6 pin of described MC34063 chip are the DC voltage input end of described PWM control unit, and it is connected to 7 pin of described MC34063 chip by described 6th resistance; 7 pin of described MC34063 chip are connected to 8 pin of described MC34063 chip by described 7th resistance, and are connected to 1 pin of described MC34063 chip by described first inductance; 1 pin of described MC34063 chip is via described 3rd diode, described 6th capacity earth; The DC voltage output end of the just very described PWM control unit of described 6th electric capacity, and by described 8th resistance and the 9th grounding through resistance; Described 8th resistance is connected with 5 pin of described MC34063 chip with the contact of the 9th resistance; 2 pin of described MC34063 chip, 4 pin ground connection, 3 pin of described MC34063 chip are by described 7th capacity earth; Wherein, 1 pin of described MC34063 chip is the PWM output of described PWM control unit.
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| CN201520348437.4U CN204615628U (en) | 2015-05-26 | 2015-05-26 | Multistage negative pressure generating circuit |
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| CN201520348437.4U CN204615628U (en) | 2015-05-26 | 2015-05-26 | Multistage negative pressure generating circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529917A (en) * | 2016-01-21 | 2016-04-27 | 中山芯达电子科技有限公司 | High efficiency fast voltage generating circuit |
| CN108447434A (en) * | 2018-03-20 | 2018-08-24 | 京东方科技集团股份有限公司 | A kind of negative pressure output circuit and display panel |
| CN109949774A (en) * | 2019-04-24 | 2019-06-28 | 晶晨半导体(上海)股份有限公司 | A kind of circuit obtaining second level negative pressure |
| CN110289759A (en) * | 2019-06-21 | 2019-09-27 | 深圳市思榕科技有限公司 | A kind of power circuit generating negative pressure |
-
2015
- 2015-05-26 CN CN201520348437.4U patent/CN204615628U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529917A (en) * | 2016-01-21 | 2016-04-27 | 中山芯达电子科技有限公司 | High efficiency fast voltage generating circuit |
| CN108447434A (en) * | 2018-03-20 | 2018-08-24 | 京东方科技集团股份有限公司 | A kind of negative pressure output circuit and display panel |
| CN109949774A (en) * | 2019-04-24 | 2019-06-28 | 晶晨半导体(上海)股份有限公司 | A kind of circuit obtaining second level negative pressure |
| CN109949774B (en) * | 2019-04-24 | 2022-01-21 | 晶晨半导体(上海)股份有限公司 | Circuit for acquiring secondary negative voltage |
| CN110289759A (en) * | 2019-06-21 | 2019-09-27 | 深圳市思榕科技有限公司 | A kind of power circuit generating negative pressure |
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