CN202421349U - Electric field strength detection circuit - Google Patents
Electric field strength detection circuit Download PDFInfo
- Publication number
- CN202421349U CN202421349U CN2012200040414U CN201220004041U CN202421349U CN 202421349 U CN202421349 U CN 202421349U CN 2012200040414 U CN2012200040414 U CN 2012200040414U CN 201220004041 U CN201220004041 U CN 201220004041U CN 202421349 U CN202421349 U CN 202421349U
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- amplification circuit
- detection
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Abstract
The utility model relates to an electric field strength detection circuit which comprises an input circuit, a signal-detection initial-stage amplification circuit, a signal-detection final-stage amplification circuit, a sound and light alarm circuit and a battery power supply. The input circuit of the signal-detection initial-stage amplification circuit is connected with a sensing antenna; the signal-detection final-stage amplification circuit is connected with the output end of the signal-detection initial-stage amplification circuit; and the light alarm circuit and the battery power supply are connected with the output end of the signal-detection final-stage amplification circuit; the signal-detection initial-stage amplification circuit comprises a signal amplification circuit of a NPN triode; an input circuit between the base electrode and the emitting electrode of the signal-detection initial-stage amplification circuit is a resistor voltage division circuit which is composed of a first resistor and a second resistor; a backward diode for protecting the triode and the stable alternating-current gain is connected between the base electrode and the emitting electrode of the signal-detection initial-stage amplification circuit; a first capacitor for increasing the circuit stability is also connected between the base electrode and the emitting electrode of the signal-detection initial-stage amplification circuit; and the signal-detection final-stage amplification circuit is a signal amplification circuit comprising a PNP triode. The electric field strength detection circuit has the advantages of simple structure, low cost sound, light alarm function, high sensitivity, strong anti-interference performance and high stability and is suitable for low, medium and high-frequency electric field strength detection.
Description
Technical field
The utility model relates to, and particularly relates to a kind of electric field intensity detecting circuit that high electrograph therapy instrument is used.
Background technology
The existing employed electric field intensity detecting circuit of high electrograph therapy instrument, circuit structure is simple, exist mostly be subject to disturb, sensitivity and the lower problem of stability.
Summary of the invention
The utility model technical matters to be solved is the defective that remedies above-mentioned prior art, and a kind of improved electric field intensity detecting circuit is provided.
The technical matters of the utility model solves through following technical scheme.
This electric field intensity detecting circuit; Comprise the elementary amplifying circuit of input that induction antenna, input circuit be connected with induction antenna, the input final stage amplifying circuit that input end is connected with the output terminal of the elementary amplifying circuit of input, the sound light alarming circuit that input end is connected with the output terminal of input final stage amplifying circuit, and battery supply.
The characteristics of this electric field intensity detecting circuit are:
The elementary amplifying circuit of said input is the signal amplification circuit that comprises the NPN triode; The resistor voltage divider circuit that input circuit between its base stage and the emitter is made up of first resistance and second resistance; Between base stage and emitter, be connected with the backward dioded of a protection NPN triode and stable ac gain; Between base stage and collector, also be connected with first electric capacity of an increase circuit stability, the detection sensitivity of the ratio decision electric field intensity detecting circuit of said first resistance and second resistance.
The technical matters of the utility model solves through following further technical scheme.
Said input final stage amplifying circuit is the signal amplification circuit that comprises the PNP triode; Be connected with one the 4th resistance between its base stage and the emitter; Be connected with between its base stage and the collector one increase circuit stability second electric capacity, its base stage also is connected with the 3rd resistance as the NPN triode of the elementary amplification circuit output end of input as input end.
Said sound light alarming circuit comprises the warning branch road that an active hummer becomes with a light emitting diode series; One end of said warning branch road is connected with the emitter of NPN triode, and the other end is connected with collector as the PNP triode of input final stage amplification circuit output end as input end.
Said battery supply comprises the power branch that a battery and a power switch are composed in series, and an end of said power branch is connected with the emitter of NPN triode, and the other end is connected with the emitter of PNP triode.Said battery supply is through its connecting and disconnecting of power switch control.
Said induction antenna and the elementary amplifying circuit of said input are arranged on the same circuit board.
The beneficial effect of the utility model and prior art contrast is:
The utility model circuit is simple, and cost is low, has sound and light of alarm, and electric field intensity signal amplifies after induction antenna obtains signal, and is highly sensitive, strong interference immunity, and stability is high.Adaptable across low, in and the detection of high-frequency electric field intensity.
Description of drawings
Accompanying drawing is the circuit diagram of the utility model embodiment.
Embodiment
Below in conjunction with and contrast accompanying drawing the utility model described.
A kind of as shown in the drawings; Comprise the elementary amplifying circuit of input that induction antenna S1, input circuit be connected with induction antenna S1, the input final stage amplifying circuit that input end is connected with the output terminal of the elementary amplifying circuit of input, the sound light alarming circuit that input end is connected with the output terminal of input final stage amplifying circuit, and battery supply.The elementary amplifying circuit of induction antenna S1 and input is arranged on the same circuit board.
The elementary amplifying circuit of input is to comprise that model is the signal amplification circuit of the NPN triode Q1 of 9014D; The resistor voltage divider circuit that input circuit between its base stage and the emitter is made up of first resistance R 1 and second resistance R 2; Between base stage and emitter, be connected with the backward dioded D2 of a protection NPN triode Q1 and stable ac gain, between base stage and collector, also be connected with first capacitor C 2 of an increase circuit stability.The intrinsic standoff ratio of resistor voltage divider circuit is 1: 300.
Input final stage amplifying circuit is to comprise that model is the signal amplification circuit of the PNP triode Q2 of 9015D; Be connected with one the 4th resistance R 4 between its base stage and the emitter; Be connected with between its base stage and the collector one increase circuit stability second capacitor C 1, its base stage also is connected with the 3rd resistance R 3 as the NPN triode Q1 of the elementary amplification circuit output end of input as input end.
Sound light alarming circuit comprises the warning branch road that an active hummer PZ1 and a light emitting diode D1 are composed in series; One end of warning branch road is connected with the emitter of NPN triode Q1, and the other end is connected with collector as the PNP triode Q2 of input final stage amplification circuit output end as input end.
Battery supply comprises that a capacity is the power branch that a 100mAh battery B1 and a power switch are composed in series, and an end of power branch is connected with the emitter of NPN triode Q1, and the other end is connected with the emitter of PNP triode Q2.
Whole testing circuit is controlled it and is broken off through switch SW T1 by battery B1 power supply.
The electric field intensity testing process of this embodiment is following:
Power switch SWT1 is placed the connection position, and battery B1 supplies power to whole testing circuit; Electric field intensity signal to be detected is imported through induction antenna S1; Successively through after the elementary amplifying circuit of input and the amplification of input final stage amplifying circuit two-stage, send sound and light alarm after the resistor voltage divider circuit dividing potential drop of forming by first resistance R 1 and second resistance R 2 by active hummer PZ1 and light emitting diode D1 in the sound light alarming circuit.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.Those of ordinary skill for technical field under the utility model; Under the prerequisite that does not break away from the utility model design, make some alternative or obvious modification that are equal to; And performance or purposes are identical, all should be regarded as belonging to the scope of patent protection that the utility model is confirmed by claims of being submitted to.
Claims (5)
1. electric field intensity detecting circuit; Comprise the elementary amplifying circuit of input that induction antenna, input circuit be connected with induction antenna, the input final stage amplifying circuit that input end is connected with the output terminal of the elementary amplifying circuit of input, the sound light alarming circuit that input end is connected with the output terminal of input final stage amplifying circuit; And battery supply, it is characterized in that:
The elementary amplifying circuit of said input is the signal amplification circuit that comprises the NPN triode; The resistor voltage divider circuit that input circuit between its base stage and the emitter is made up of first resistance and second resistance; Between base stage and emitter, be connected with the backward dioded of a protection NPN triode and stable ac gain, between base stage and collector, also be connected with first electric capacity of an increase circuit stability.
2. electric field intensity detecting circuit as claimed in claim 1 is characterized in that:
Said input final stage amplifying circuit is the signal amplification circuit that comprises the PNP triode; Be connected with one the 4th resistance between its base stage and the emitter; Be connected with between its base stage and the collector one increase circuit stability second electric capacity, its base stage also is connected with the 3rd resistance as the NPN triode of the elementary amplification circuit output end of input as input end.
3. according to claim 1 or claim 2 electric field intensity detecting circuit is characterized in that:
Said sound light alarming circuit comprises the warning branch road that an active hummer becomes with a light emitting diode series; One end of said warning branch road is connected with the emitter of NPN triode, and the other end is connected with collector as the PNP triode of input final stage amplification circuit output end as input end.
4. electric field intensity detecting circuit as claimed in claim 3 is characterized in that:
Said battery supply comprises the power branch that a battery and a power switch are composed in series, and an end of said power branch is connected with the emitter of NPN triode, and the other end is connected with the emitter of PNP triode.
5. electric field intensity detecting circuit as claimed in claim 4 is characterized in that:
Said induction antenna and the elementary amplifying circuit of said input are arranged on the same circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200040414U CN202421349U (en) | 2012-01-06 | 2012-01-06 | Electric field strength detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200040414U CN202421349U (en) | 2012-01-06 | 2012-01-06 | Electric field strength detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202421349U true CN202421349U (en) | 2012-09-05 |
Family
ID=46746102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200040414U Expired - Lifetime CN202421349U (en) | 2012-01-06 | 2012-01-06 | Electric field strength detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202421349U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954848A (en) * | 2014-04-21 | 2014-07-30 | 国家电网公司 | Portable field strength measurement device and field strength measurement method based on DSP and FPGA |
-
2012
- 2012-01-06 CN CN2012200040414U patent/CN202421349U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954848A (en) * | 2014-04-21 | 2014-07-30 | 国家电网公司 | Portable field strength measurement device and field strength measurement method based on DSP and FPGA |
| CN103954848B (en) * | 2014-04-21 | 2015-12-30 | 国家电网公司 | Based on portable field intensity measurement mechanism and the method for DSP and FPGA |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120905 |