CN87201023U - Voltage range detecting device of dc power supply - Google Patents
Voltage range detecting device of dc power supply Download PDFInfo
- Publication number
- CN87201023U CN87201023U CN 87201023 CN87201023U CN87201023U CN 87201023 U CN87201023 U CN 87201023U CN 87201023 CN87201023 CN 87201023 CN 87201023 U CN87201023 U CN 87201023U CN 87201023 U CN87201023 U CN 87201023U
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- CN
- China
- Prior art keywords
- voltage
- utility
- model
- power supply
- supply voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Abstract
The utility model relates to a voltage output range detecting device of a DC power supply, comprising an electrical resistance, a digital gate circuit and a light-emitting diode. The utility model is characterized in that the traditional device composed of the electrical resistance, the digital gate circuit and the light-emitting diode is replaced by the utility model. The utility model has the advantages of low cost, high precision and wide voltage detection range, which can be widely used for the alarm of excess voltage and under voltage of DC poewr supply voltage of electric machines and instruments.
Description
The invention belongs to a kind of pick-up unit, especially for the scope that detects the direct supply output voltage.
The pick-up unit of existing direct supply voltage, normally by a resistance, a current regulator diode and a phase inverter are formed, and its basic circuit is as shown in Figure 1.Owing to adopted a current regulator diode, its steady current ID can not be totally independent of supply voltage E, cause constant voltage uA to become with E, influenced the measuring accuracy of the supply voltage that detects, and current regulator diode is when both end voltage is too high, can be breakdown, thus this Device Testing scope is narrowed down.
The purpose of this invention is to provide a kind of electronic circuit of only forming by resistance and digital gate circuit.Current regulator diode with in the resistance replacement traditional circuit improves the device to test low precision because of using current regulator diode to cause, the weakness that test specification is narrow.The basic circuit of apparatus of the present invention as shown in Figure 2.UA=(R wherein
2)/(R
1+ R
2) * E.By there being following relation between turnover voltage VT that tests CMOS and TTL gate circuit as can be known and uA:
CMOS:(dV
T)/(dE)＞(du
A)/(dE) is △ V
T＞△ u
A
TTL:(dV
T)/(dE)＜(du
A)/(dE) is △ V
T＜△ u
A
Principle of work of the present invention is exactly according to R
1, R
2Partial pressure value uA AND circuit turnover voltage is with the inconsistent under-voltage and overpressure situation that detects supply voltage of E pace of change.The side circuit of apparatus of the present invention is seen accompanying drawing 3.When adopting the TTL gate circuit, when u01 shown in Figure 3 was higher than certain prevalue at supply voltage E, it was flat to height to jump from low level, realizes over voltage alarm; U02 then when E is lower than certain prevalue, jumps to high level from low level, realizes undervoltage warning.If do not use the TTL gate circuit, and when adopting cmos circuit, its working condition is just opposite with use TTL.
Accompanying drawing 1 is the basic circuit of existing power supply voltage check device.
Accompanying drawing 2 is the basic circuit of apparatus of the present invention.
Accompanying drawing 3 is the real work circuit of apparatus of the present invention.
The present invention is achieved in that an integrated package 74LSO4 or CC4069 hex inverter is linked to each other according to apparatus of the present invention real work circuit shown in the accompanying drawing 3 with 4 resistance.Arabic numeral among the figure " 1 " to " 14 " expressions 74LSO4 to pin.4 pins among Fig. 4 after the encapsulation of " 15 " to " 18 " expression apparatus of the present invention.In " 14 " and " 11 ", " 11 " and " 7 ", " 14 " and " 1 " are inserted resistance R respectively between " 1 " and " 7 "
3, R
4, R
5, R
6, and draw lead-foot-line " 15 ", " 16 ", " 17 ", " 18 ", attention places 4 resistance in the groove at the 74LSO4 phase inverter back side after checking that all pads are firm, puts into the mould of random appearance, with the moulding of liquid resin package curing.Connect light emitting diode then.Also the dual signal light emitting diode can be encapsulated in the mould internal shaping in the lump, but expose the two ends of luminous colour developing with will be clear that.
Accompanying drawing 4 is the profile synoptic diagram of apparatus of the present invention.
Provide an embodiment below, the 74LSO4TTL hex inverter that adopts MIT to produce inserts resistance R
3=8.2K, R
4=2.2K, R
5=8.8K, R
6=2.93K makes apparatus of the present invention by preceding method.During actual the use, with pin " 15 ", " 18 " connect the both positive and negative polarity of the power supply of surveying, and " 16 ", " 17 " connect a dual signal light emitting diode.Then work as the supply voltage that detected by low when rising to 5.54 volts, luminescent diode red lamp is bright, the realization over voltage alarm; And when supply voltage dropped to 4.51 volts, green light was bright, realized undervoltage warning.
Apparatus of the present invention circuit is simple, and the components and parts of use are few, thereby cost is low, and integrated convenience, and the precision height of the supply voltage that detects, alarm voltage error generally can be less than ± 0.05V; And the supply voltage scope that can detect generally can reach 0.5V-19V; Concrete alarm voltage can be determined by the resistance of regulating resistance.The electrical equipment of apparatus of the present invention work of can being widely used under this scope direct supply voltage, on the instrument, convenient and detect exactly and the overvoltage and the undervoltage condition of display power supply voltage.
Claims (2)
1, a kind of device that detects the direct supply voltage range, this device comprises resistance, lead-in wire, integrated circuit, light emitting diode is characterized in that this device is made up of one 6 phase inverter integrated package four resistance of connection and a dual signal light emitting diode.
2, a kind of device that detects the direct supply voltage range according to claim 1 is characterized in that described integrated circuit is TTL or CMOS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87201023 CN87201023U (en) | 1987-01-24 | 1987-01-24 | Voltage range detecting device of dc power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87201023 CN87201023U (en) | 1987-01-24 | 1987-01-24 | Voltage range detecting device of dc power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87201023U true CN87201023U (en) | 1988-03-09 |
Family
ID=4817374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87201023 Ceased CN87201023U (en) | 1987-01-24 | 1987-01-24 | Voltage range detecting device of dc power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87201023U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1991396B (en) * | 2005-12-30 | 2010-05-05 | 鸿富锦精密工业（深圳）有限公司 | Voltage detection means |
-
1987
- 1987-01-24 CN CN 87201023 patent/CN87201023U/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1991396B (en) * | 2005-12-30 | 2010-05-05 | 鸿富锦精密工业（深圳）有限公司 | Voltage detection means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |