CN203251236U - A voltage following deep negative feedback constant current source apparatus - Google Patents
A voltage following deep negative feedback constant current source apparatus Download PDFInfo
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- CN203251236U CN203251236U CN 201320290581 CN201320290581U CN203251236U CN 203251236 U CN203251236 U CN 203251236U CN 201320290581 CN201320290581 CN 201320290581 CN 201320290581 U CN201320290581 U CN 201320290581U CN 203251236 U CN203251236 U CN 203251236U
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Abstract
The utility model discloses a voltage following deep negative feedback constant current source apparatus which comprises an input rectifying and filtering unit, a DC-AC inverter unit, an output rectifying and filtering unit, a linear constant current adjusting transistor, and a load which are connected successively. The input rectifying and filtering unit is connected with an AC power supply. The load is connected with a voltage sampling unit and a current sampling unit. The voltage sampling unit is connected with a PWM voltage control unit connected with the DC-AC inverter unit. The current sampling unit is connected with a constant current control unit connected with the linear constant current adjusting transistor. On the basis of a conventional constant current source circuit, the voltage following deep negative feedback constant current source apparatus applies the PWM voltage control unit. Therefore, the voltage of a control power varies with the change of the load and thus the voltage on the linear constant current adjusting transistor maintains a constant value all the time. As a result, the voltage following deep negative feedback constant current source apparatus has advantages of good constant current effect, high precision, and fast response which a constant current source circuit has, and has advantages of high efficiency, low power consumption, low temperature rise, and high reliability which a switching power supply circuit has.
Description
Technical field
The utility model relates to a kind of constant-current source device, especially relates to a kind of voltage follow formula deep negative feedback constant-current source device.
Background technology
Constant-current source device is exactly a kind of supply unit that constant current can be provided to load, and it produces at extraneous electric network source and still can make the output current maintenance constant when fluctuation and impedance operator change.Constant-current source circuit has the characteristics such as constant output current, temperature stability is good, response is quick.
Constant-current source device is to use one of maximum circuit unit in electronic circuit and analog integrated circuit.Constant-current source device has important purposes in fields of measurement and engineering: the adjusting equipments such as universal instrument, ammeter, and precision resistance is measured, the parameter measurement of semiconductor device, electronic loads etc. all be unable to do without constant-current source circuit.All kinds of Sensitive Apparatuses of at present extensive use: the transducers such as, magnetosensitive quick, photosensitive such as temperature-sensitive, power, wet sensitive, usually adopt the constant-current source device power supply.
In current electron trade, the constant-current source circuit of employing is still adjusted pipe take linearity and is carried out the constant flow regulation mode as main, particularly in the low power applications occasion of output current in uA～mA level, substantially all is to adopt the Linear CCS circuit; Electric current flows through adjusts the Guan Shihui heating, is operated in the adjustment pipe under the linear condition, and at load resistance hour, its two ends pressure drop is near supply voltage; Can produce a large amount of heat at adjustment pipe two ends, cause efficient very low.In the high-power applications occasion, the constant-current source of Switching Power Supply control mode had appearred in recent years, and its output current can reach several amperes even tens amperes.The constant-current source of Switching Power Supply mode, the defective such as efficient is high, and volume is little, but exists the constant current effect slightly poor, and precision is low.
Summary of the invention
The voltage follow formula deep negative feedback constant-current source device that the problem and shortage that exists in order to solve prior art, the utility model provide a kind of dynamic following power supply regulator circuit to combine with traditional constant-current source circuit.
Voltage follow formula deep negative feedback constant-current source device of the present utility model, comprise the input rectifying filter unit that connects in turn, the DC-AC inversion unit, the output rectification filter unit, linear constant current adjustment pipe, load, described input rectifying filter unit is connected with AC power, it is characterized in that: described load is connected with respectively voltage sampling unit and current sampling unit, described voltage sampling unit is connected with the PWM voltage control unit that is connected with described DC-AC inversion unit, and described current sampling unit is connected with described linear constant current and adjusts the constant current control unit that pipe is connected.Wherein, described constant current control unit also is connected with constant flow regulation adjustable reference potential circuit, and the voltage at described linear constant current adjustment pipe the two poles of the earth is reduced to 2V.
Voltage follow formula deep negative feedback constant-current source device of the present utility model, on the basis of traditional constant-current source circuit, increased the PWM power control unit, the control supply voltage changes along with the variation of load, be a dynamic value, so that the voltage drop that linear constant current is adjusted on the pipe remains steady state value: about 2V.Voltage follow formula deep negative feedback constant-current source device of the present utility model, that the dynamic following power supply regulator circuit combines with traditional constant-current source circuit, both kept traditional constant-current source circuit constant current effective, precision is high, respond fast advantage, have again switching power circuit efficient high, power consumption is little, temperature rise is low, the advantage that reliability is high.Voltage follow formula deep negative feedback constant-current source device of the present utility model is the desirable alternative of present traditional constant-current source circuit, and particularly in the application scenario of the above high power constant-current source of ampere level, volume is compared traditional approach, greatly reduction; Energy-saving effect is remarkable simultaneously, and temperature rise is low, and reliability is high; Also effectively save the metal consumptive material, significantly reduce energy resource consumption, can bring good economic benefit.
This shows, compared with prior art, the utlity model has substantive distinguishing features and technological progress, the beneficial effect of its enforcement also is apparent.
Description of drawings
Below in conjunction with accompanying drawing, the utility model embodiment is described further.
Fig. 1 is the schematic diagram of the utility model voltage follow formula deep negative feedback constant-current source device.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
The utility model voltage follow formula deep negative feedback constant-current source device, comprise the input rectifying filter unit, DC-AC inversion unit, output rectification filter unit, linear constant current adjustment pipe, the load that connect in turn, the input rectifying filter unit is connected with AC power, load is connected with respectively voltage sampling unit and current sampling unit, the voltage sampling unit is connected with the PWM voltage control unit that is connected with the DC-AC inversion unit, and the current sampling unit is connected with linear constant current and adjusts the constant current control unit that pipe is connected.
Described constant current control unit also is connected with constant flow regulation adjustable reference potential circuit, and this constant flow regulation adjustable reference potential circuit is regulating constant current control unit as required, thereby regulates the current value of adjusting pipe by linear constant current.
The operation principle of the utility model voltage follow formula deep negative feedback constant-current source device is as follows:
The power work principle: AC power is behind the input rectifying filter unit, be converted into dc power supply, DC-AC inversion unit circuit via the control of PWM voltage control unit, form high-frequency pulse voltage, carry out rectifying and wave-filtering by the output rectification filter unit again, provide reliable and stable for linear constant current adjustment pipe, the load circuit of rear class, and the direct-current working volts that change with load variations.
Constant current control principle: when load changes, when increasing (load equivalent impedance reduction) or reducing (load equivalent impedance increase), respective change occurs in signal that the current sampling unit records simultaneously, following load increases or reduces, the signal that the current sampling unit records offers the constant current control unit, adjust the multiplication factor of pipe to adjust linear constant current, so that adjusting the multiplication factor of pipe, linear constant current changes simultaneously, reduce or increase, constant with the current constant that keeps flowing through load.
Voltage Dynamic Adjustment Principle: when load changes, when increasing (load equivalent impedance reduction) or reducing (load equivalent impedance increase), respective change occurs in signal that the voltage sampling unit records simultaneously, following load increases or reduces, the signal that the voltage sampling unit records offers the PWM voltage control unit, duty ratio with the switching tube of adjusting the DC-AC inversion unit, so that the voltage follow after the inversion the load dynamic change, reduce accordingly or increase, to keep the voltage between linear constant current adjustment pipe the two poles of the earth substantially to keep a steady state value: about 2V, keep lower power consumption.
Claims (3)
1. a voltage follow formula deep negative feeds back constant-current source device, comprise the input rectifying filter unit, DC-AC inversion unit, output rectification filter unit, linear constant current adjustment pipe, the load that connect in turn, described input rectifying filter unit is connected with AC power, it is characterized in that: described load is connected with respectively voltage sampling unit and current sampling unit, described voltage sampling unit is connected with the PWM voltage control unit that is connected with described DC-AC inversion unit, and described current sampling unit is connected with described linear constant current and adjusts the constant current control unit that pipe is connected.
2. voltage follow formula deep negative according to claim 1 feeds back constant-current source device, and it is characterized in that: described constant current control unit also is connected with constant flow regulation adjustable reference potential circuit.
3. according to claim 1 or 2 described voltage follow formula deep negatives feedback constant-current source devices, it is characterized in that: the voltage at described linear constant current adjustment pipe the two poles of the earth is reduced to 2V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320290581 CN203251236U (en) | 2013-05-26 | 2013-05-26 | A voltage following deep negative feedback constant current source apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320290581 CN203251236U (en) | 2013-05-26 | 2013-05-26 | A voltage following deep negative feedback constant current source apparatus |
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| CN203251236U true CN203251236U (en) | 2013-10-23 |
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| CN 201320290581 Expired - Fee Related CN203251236U (en) | 2013-05-26 | 2013-05-26 | A voltage following deep negative feedback constant current source apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701341A (en) * | 2013-05-26 | 2014-04-02 | 山东蓝孚高能物理技术有限公司 | Voltage following type depth negative feedback constant current source device |
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2013
- 2013-05-26 CN CN 201320290581 patent/CN203251236U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701341A (en) * | 2013-05-26 | 2014-04-02 | 山东蓝孚高能物理技术有限公司 | Voltage following type depth negative feedback constant current source device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Five Ji'nan province high tech Zone, Shandong Road, No. 2711, No. 250101 Patentee after: SHANDONG VANFORM HIGH ENERGY PHYSICS TECHNOLOGY Co.,Ltd. Address before: Five Ji'nan province high tech Zone, Shandong Road, No. 2711, No. 250101 Patentee before: SHANDONG VANFORM HIGH ENERGY PHYSICS TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131023 |
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| CF01 | Termination of patent right due to non-payment of annual fee |