CN202043036U

CN202043036U - Novel micro-power high-voltage power supply

Info

Publication number: CN202043036U
Application number: CN2011201448549U
Authority: CN
Inventors: 宋建明
Original assignee: 宋建明
Current assignee: Shenzhen Daking Optoelectronics Co., Ltd.
Priority date: 2011-05-06
Filing date: 2011-05-06
Publication date: 2011-11-16
Anticipated expiration: 2021-05-06

Abstract

The utility model relates to the technical field of power supplies of imaging devices of the first generation of infrared low light level night vision devices and other electronic accelerators, in particular to a novel micro-power high-voltage power supply which is provided with a power input terminal and an output terminal with an adjustable boost circuit, wherein a first P-MOS (P-type field-effect tube) is connected in series between the anode of the power input terminal and the output terminal, the drain electrode of the first P-MOS is connected with the anode of the power input terminal, the source electrode of the first P-MOS is connected with the adjustable boost circuit of the output terminal, the grid electrode of the first P-MOS is grounded, the adjustable boost circuit comprises three stages of adjustable boost circuits, the first-stage adjustable boost circuit is formed by connecting a direct-current (DC) boost module with a second P-MOS in parallel, the second-stage adjustable boost circuit is formed by a miniature transformer, and the third-stage adjustable boost circuit is formed by a multiplication boost module. The novel micro-power high-voltage power supply has the advantages of low energy consumption, reliable performance, long service life, is anti-glare, can effectively correct discreteness of an image tube, and the like.

Description

A kind of novel little power consumption high voltage source

Technical field:

The utility model relates to the infrared low-light level night vision device of a generation and other electronics quickens the power technique fields of the image device of quasi-instrument, refers in particular to a kind of novel little power consumption high voltage source.

Background technology:

Though generation night vision power supply exists at present; but mostly be external design greatly; and have the unit of this technology or enterprise seldom; only boost and the multiplication of voltage principle with DC boosting or transformer simply independently technically; the direct voltage of input is raised to the needed direct voltage of image tube; this series products simplicity of design, immature; have a lot of technical problems: produce when the change in voltage of input unstablely as output voltage, operating current is short than macrocell useful life, do not have the high light protection to damage problems such as image tube easily.

The utility model content:

The purpose of this utility model is to overcome the deficiencies in the prior art part, provides to have that energy consumption is low, dependable performance, long service life, anti glare anti static coatings, can effectively revise novel little power consumption high voltage source of advantages such as image tube discreteness.

The utility model realizes that the technical scheme that its purpose adopts is: a kind of novel little power consumption high voltage source, have power input and output with adjustable booster circuit, between the positive pole of power input and output, be in series with one the one P-MOS (being P type field effect transistor), the drain electrode of the one P-MOS connects the power input positive pole, source electrode connects the adjustable booster circuit of output, grounded-grid; Described adjustable booster circuit comprises three grades of adjustable booster circuits, and wherein, the adjustable booster circuit of the first order is formed by DC boosting module and the 2nd P-MOS parallel connection; The adjustable booster circuit in the second level is formed by miniature transformer; The adjustable booster circuit of the third level is formed by the multiplication boost module.

Before the adjustable booster circuit in the described second level, be provided with high light protection module and the two-tube constant-current driven module of little electric current.

Miniature transformer in the adjustable booster circuit in the second level is SMD high frequency transformer.

After the utility model adopts said structure, guaranteeing under the common night vision image tube optimum operating voltage prerequisite, added much enhance product performance, the functional unit of product self-protection, effectively reduced the battery low-loss, the battery fool proof, wide voltage power supply, the little power consumption work of product, the delayed startup of driving helps to prolong the useful life of product, and the automatic high light protection of load feedback formula can avoid expensive image tube to damage under high light; The use of small size high frequency transformer and two-tube push-pull type drive, and reduce small product size; Frequency synthesising type concussion mode is protected and is driven the stability and high efficiency low noise; Owing to have above performance advantage, make the performance quality of novel little power consumption high voltage source of the present utility model meet or exceed the advanced level of world's like product, make the infrared low-light level night vision device of a generation can adapt to the user demand of more numerous product harshnesses.

Description of drawings:

Fig. 1 is overall structure of the present utility model and the theory diagram that is connected with image intensifier;

Fig. 2 is the schematic diagram of the adjustable booster circuit in the second level in the utility model;

Fig. 3 is that the utility model power supply outputs to the voltage of image intensifier and the curve chart of the relation of start-up time;

Fig. 4 is the curve chart that the utility model power supply outputs to the relation of the voltage of image intensifier and ambient light illumination;

The curve chart of the relation of the observation brightness of image intensifier and ambient light illumination when Fig. 5 is to use the utility model power supply operate as normal;

Fig. 6 is a high light protection module frequency synthesis schematic diagram in the utility model.

Embodiment:

Below in conjunction with specific embodiments and the drawings the utility model is further specified.

As shown in Figure 1, a kind of novel little power consumption high voltage source, have power input 1 and output 2 with adjustable booster circuit 3, between the positive pole of power input 1 and output 2, be in series with one the one P-MOS 4, the drain electrode of the one P-MOS 4 connects the power input positive pole, source electrode connects the adjustable booster circuit 3 of output 2, and grounded-grid forms P-MOS (being P type field effect transistor) polar protective circuit; In this circuit, after the normal connection of input, the individual pin of the one P-MOS 4 is in normal operating conditions, at this moment, a P-MOS 4 conductings, electric current is from the drain-to-source of a P-MOS 4, because the conducting resistance of a P-MOS is very little, so pressure drop is very little behind normally, under product operating current state, conduction voltage drop almost can be ignored; Therefore the loss of power supply is just very little; And when the input error-polarity connection, because the grid voltage of a P-MOS 4 is higher than drain voltage, the one P-MOS4 is in partially anti-, at this moment the source electrode of a P-MOS 4 and drain electrode disconnects, do not allow the reverse current pass through, thereby guaranteed that effectively load electronic original part partly is not subjected to the impact of reverse current and damages.

Described adjustable booster circuit 3 comprises three grades of adjustable booster circuits, and wherein, the first order is adjustable, and booster circuit 31 is formed by DC boosting module 311 and the 2nd P-MOS 312 parallel connections; The second level is adjustable, and booster circuit 32 is formed by miniature transformer 321, and the third level is adjustable, and booster circuit 33 is formed by multiplication boost module 331.Described miniature transformer 321 is SMD high frequency transformer, and is provided with high light protection module 322 and the two-tube constant-current driven module 323 of little electric current before the adjustable booster circuit 32 in the described second level.

In generation night vision use, maximum problem is high light protection and the consistency problem of observing brightness.Appended high light protection design among the design.In the end load signal of the high-pressure stage of the load of one-level-photoelectricity image intensifier feedback is given high light protection module 322; when external environment illumination reaches certain value (with reference to Fig. 4; as 20Lux) time; signal generating circuit can adjust; drive signal is weakened; make the high pressure of output drop to the stage that is not enough to light image intensifier, close image intensifier work at last, reach the purpose of high light protection.That adjusts the high light protection opens the control point, can start the protection of grow light under different external environment illumination.

Stable constant current micropower drives, and it is adjustable that the control point is opened in the bearing power protection, the adjustable brightness protection range

In the adjustable booster circuit 32 in the design's the second level, adopt the two-tube constant-current driving of little electric current, guaranteed the stable and reliable of whole driving like this.And when the control point is opened in the high light protection that ambient light illumination does not reach setting; the relevant constant-current circuit of high light protection can be according to external environment illumination; the high pressure of linear adjustment output; make the brightness of observation reach a steady state value; promptly observing brightness does not change with the variation of ambient light illumination; be auto brightness control (with reference to Fig. 5), the effect of Guan Chaing just is able to great lifting like this.

Frequency synthesis in the high light protection module 322 is the concussion mode, guarantees the steadily adjustable of driving, 20～50Hz and 20～50Khz mixing.Ask for an interview Fig. 6, it is that mode with frequency synthesis obtains that the design's drive signal produces, and adjusts the frequency of two modulation signals, can change the power of driving and the time of startup.Adjust the frequency of 20～50hz, heighten then driving force reinforcement, turning down then, driving force weakens.Adjust the frequency characteristic that 20～20Khz can cooperate the multiplication of voltage supercharging, under the prerequisite that guarantees no audible noise, cooperate the element characteristic of multiplication of voltage supercharging, can reach the best operating efficiency of boosting.

As shown in Figure 3, the utility model adopts the adjustable booster circuit of stage high-effective rate, and the assurance high pressure is exported to stablize and reached 18.5 ± 0.5KV.Because the adjustable booster circuit 31 of the first order has adopted that direct current is adjustable to boost, guaranteed when input voltage changes the stablizing of output voltage.The third level is adjustable, and booster circuit 33 boosts for multiplication, has guaranteed that the ripple under the capacitive load state is very little, and the ripple rate can be less than 5 ‰ adjustable extents

The first order adopts the high efficiency switch power supply of direct current to direct current, the input voltage of 2-4.5V is boosted to 3-5V, in boost module, add adjustable port, output voltage is become and can adjust arbitrarily in allowed limits, for guaranteeing whole efficient of boosting, require self efficient of boost module must be higher than 80%, frequency is more than 500Khz.And substitute traditional high speed diode with the 2nd P-MOS, reduce conduction voltage drop, also can improve conversion efficiency.The transformer boosting mode is adopted in the second level, adjusts suitable transformation ratio and can make the multiplying power height that boosts, and efficient also can be guaranteed.Efficient can reach 90% under the situation of boosting of hundred times of 2-3.The mode that the third level adopts multiplication of voltage to boost, efficient can reach 95%, and can increase the multiplying power of boosting arbitrarily in principle.Because each level in the design is all considered operating efficiency in design, so total power consumption of entire product is just very little, the total power consumption during operate as normal only is no more than 40mW; During voltage 3V, electric current has improved the battery useful life of product greatly at 5-12mA..

The adjustable booster circuit 33 of the third level is that voltage-multiplying type boosts in the utility model, can regard a capacitive load substantially as in last load, under ambient light illumination low-light environment very hour, almost is a pure capacitive.Only when ambient light illumination increased gradually, ohmic load just increased thereupon, so the process that whole high pressure rises just is similar to the process of an integration supercharging.In this course, be controlled little power consumption constant-current driving owing to drive, voltage rises all slow in starting stage and final stage, has so just avoided the suffered high-power impact of image intensifying, protects and prolonged the useful life of image tube.Moreover the characteristic of multiplication transformation is the voltage height, and electric current is little.Like this, when doing high die pressing product, just needing to have avoided the disposable problem that be raised to the required big product miniaturization that transformer brought of high pressure.In addition because the electric current of multiplication transformation is little, load capacity just relatively a little less than, effectively and reliably provide favourable assurance to load feedback like this.

As shown in Figure 2, the miniature transformer 321 in the adjustable booster circuit 32 in the second level is SMD high frequency transformer.The use of small size paster high frequency transformer guarantees that boosting efficiency has reduced small product size.In the miniaturization process of photoelectricity electron emitting-type products such as night vision, because the restriction of production technology and designing technique, the step-up transformer second time of product in the past all uses volume bigger, the transformer of the special magnetic material of superhigh magnetic conductivity, the volume of product is very big like this, to the very big difficulty of miniaturization generation of product.The design uses two-tube push-pull type to drive, and special design of transformer can be used coil turn seldom, and the very high turn ratio obtains the effect of well boosting, and takes into account boosting efficiency simultaneously.In the design, we have adopted common ER9 or the magnetic core of ER11, use the LCP skeleton supporting with it, have reached the effect of well boosting, and have dwindled small product size greatly, for road has been paved in the miniaturization of night vision product.

Claims

1. novel little power consumption high voltage source, have power input (1) and have the output (2) of adjustable booster circuit (3), it is characterized in that: between the positive pole of power input (1) and output (2), be in series with one the one P-MOS (4), the drain electrode of the one P-MOS (4) connects the power input positive pole, source electrode connects the adjustable booster circuit (3) of output (2), grounded-grid; Described adjustable booster circuit (3) comprises three grades of adjustable booster circuits, and wherein, the adjustable booster circuit of the first order (31) is formed by DC boosting module (311) and the 2nd P-MOS (312) parallel connection; The adjustable booster circuit in the second level (32) is formed by miniature transformer (321); The adjustable booster circuit of the third level (33) is formed by multiplication boost module (331).

2. a kind of novel little power consumption high voltage source according to claim 1 is characterized in that: in preceding high light protection module (322) and the two-tube constant-current driven module of little electric current (323) of being provided with of the adjustable booster circuit in the described second level (32).

3. a kind of novel little power consumption high voltage source according to claim 1 and 2, it is characterized in that: the miniature transformer (321) in the adjustable booster circuit in the second level (32) is SMD high frequency transformer.