CN202183589U - Over-voltage protection device in test platform of electrical product - Google Patents
Over-voltage protection device in test platform of electrical product Download PDFInfo
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- CN202183589U CN202183589U CN2011203023238U CN201120302323U CN202183589U CN 202183589 U CN202183589 U CN 202183589U CN 2011203023238 U CN2011203023238 U CN 2011203023238U CN 201120302323 U CN201120302323 U CN 201120302323U CN 202183589 U CN202183589 U CN 202183589U
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Abstract
The utility model relates to an over-voltage protection device in a test platform of an electrical product, which is characterized in that one path of an external alternating-direct current power supply is directly communicated with a power supply circuit of a tested product through a normally closed terminal of a relay unit, and the other path is connected with a rectifier filter unit by output. The rectifier filter unit transmits a signal to a comparative unit, and the comparative unit compares voltage of the external power supply input by the rectifier filter unit with a 15V reference voltage. When the external voltage exceeds a value of the reference voltage, the comparative unit overturns to output a signal to a connected driving unit, and the driving unit controls the relay unit to be disconnected and disconnects the external power supply and the power supply circuit of the tested product. A big bottle neck problem in a test for the electrical product is resolved. Damage of the product caused by unstable voltage and mistaken operation is avoided. Safety of the test for the product is ensured. The over-voltage protection device can be applied to test platforms of most electrical products in our company.
Description
Technical field
The present invention relates to the overvoltage protection in a kind of electric equipment products testing stand, belong to the airplane power source experimental technique.
Background technology
Electric equipment products in the airplane power source product testing are various in style at present, and the environmental stress screening test of many electric equipment products, the protection item inspection of acceptance test etc. all need external power supply (comprising AC power and DC power supply).With the engine controller is example, and screening test needs the intermediate frequency power supply of external simulation generator " permanent magnetic motor ", also the 28V DC power supply need be provided simultaneously.In process of the test; Because artificial origin or the fault of power supply own may make electric power output voltage raise, because most of electric equipment products all do not have the overvoltage protection measure to the input power supply, in case overtension; Can cause damage or damage to product inside components and parts; Even seriously burn product, the experimental safe of product is caused very big threat, so be necessary improving aspect the test control.
Through groping, finally be selected in the scheme that testing stand inside installs the overvoltage protection circuit additional, with carrying out smoothly of guarantee test.Because the power type that need protect has direct current and exchanges; And interchange is divided into single-phase and three-phase again, and comprehensively these factors are considered from the angle of conveniently using, being convenient to manage; For the test of different product, it is necessary developing a kind of general excess voltage protection.
Summary of the invention
The technical problem that solves
For fear of the weak point of prior art, the present invention proposes the overvoltage protection in a kind of electric equipment products testing stand.
Technical scheme
Overvoltage protection in a kind of electric equipment products testing stand is characterized in that comprising rectification filtering unit, comparing unit, driver element, relay unit, 15V Voltage stabilizing module and 28V Voltage stabilizing module; External power of alterating and direct current is leaded up to the normally closed contact of relay unit and directly is communicated with by the power circuit of trial product; Another road connection exports rectification filtering unit to; Rectification filtering unit receives the input of combined-voltage, exports signal to comparing unit joining with it; Comparing unit connects the 15V Voltage stabilizing module and obtains working power and reference voltage, and alternating current 220V input 28V power module obtains direct current 28V, offers the working power and the 15V reference voltage of the relay coil of relay unit; Comparing unit compares the external power voltage and the 15V reference voltage of the input of rectification filtering unit; After external power voltage exceeds reference voltage value; Output signal to and joining driver element after the comparing unit upset; Driver element control relay unit makes relay unit become disconnection by conducting, makes external power and is broken off by the power circuit of trial product; Between one group of normal opened contact of relay unit and direct current 28V, connect the self-locking SR.
Said relay unit comprises 3 relays, and one group of normally closed contact of each relay directly is communicated with external power of alterating and direct current and by the power circuit of trial product.
For DC over-voltage protection, biasing resistor R in the comparing unit
5Be 10k Ω.
For the single phase alternating current (A.C.) overvoltage protection, biasing resistor R in the comparing unit
5Be 20k Ω.
For three-phase alternating current overvoltage protection, R
5Resistance is 20k Ω～40k Ω.
Beneficial effect
Overvoltage protection in the electric equipment products testing stand that the present invention proposes; Solved the very big bottleneck of electric equipment products in test; Avoided because external power spread of voltage or operator's misoperation cause damage and the damage of product, for the safety of product testing provides guarantee.Can on my company most air appliance product testing platform, use.
Description of drawings
Fig. 1: schematic block circuit diagram.
Fig. 2: embodiment of the invention circuit theory diagrams.
Embodiment
Combine embodiment, accompanying drawing that the present invention is further described at present:
Overvoltage protection in the electric equipment products testing stand of present embodiment comprises rectification filtering unit, comparing unit, driver element, relay unit, 15V Voltage stabilizing module and 28V Voltage stabilizing module;
The input of said rectification filtering unit is D
1～D
6The alternating current-direct current bridge rectifier of forming connects R then
1And C
1The filter circuit of forming.For taking into account the use of three-phase alternating current, single phase alternating current (A.C.), DC power supply, adopt three-phase full wave rectifier circuit, rectification, filtered voltage after dividing potential drop, sampling as an input of comparator.
Said comparing unit is comparator/operational amplifier and biasing resistor R thereof
5, R
2, W
1, R
8, R
9And D
7Form R
5Confirm to carry out performance evaluation and debugging when adopting this overvoltage protection plate for different power supply classification and product:
(1) for DC over-voltage protection; Because DC input voitage is generally 28V; For obtain the higher voltage signal at comparator input terminal; R5 resistance is selected 10k Ω for use in the wiring board, because the improper supply power voltage upper limit minimum value of most of product is 30V, is 30V so we set up over-voltage protection point.
(2) for the single phase alternating current (A.C.) overvoltage protection; Because to have only a kind of permanent magnetic motor of generator at present is single-phase output, and voltage is 36V～40V, is about 50V through direct voltage after the full-wave rectification; R5 resistance is selected 20k Ω for use in the wiring board, over-voltage protection point is set up be AC value 42V.
(3) for the three-phase alternating current overvoltage protection; Because the permanent magnetic motor voltage of different generators is different; Its line magnitude of voltage does not wait at 30V to 110V; Be up to about 160V through direct voltage after the full-wave rectification, R5 resistance is selected 20k Ω～40k Ω for use in the wiring board, and the setting of over-voltage protection point is decided according to different product.
W wherein
1Be used to the elegant fine setting of overturning.
Through rectification, filtered voltage and reference voltage are compared, after external power voltage exceeds fiducial value, comparator toggles.
Said driver element is a resistance R
3Form with the triode switch pipe; Said relay unit is made up of 3 relays; Relay is communicated with working power through amplifier, the normal opened contact of relay with external power of alterating and direct current with directly be communicated with by the power circuit of trial product; The switching of triode switch pipe is determined by comparator output terminal, the switching of switch controlled relay.Thereby the switching through control relay reach the control external power with by the purpose of the switching of trial product, and form relay system interlocking through relay contact and realize auto-lock function.
Said 28V Voltage stabilizing module adopts modules A C/DC15V, and 15V voltage adopts the DC voltage-stabilizing pipe, thereby obtains direct current 28V and 15V voltage, for comparator provides working power and reference power supply, and the working power of relay coil is provided.
Operation principle and process: through to external power (three-phase alternating voltage, single phase alternating current (A.C.) voltage, direct voltage) rectification, filtering, sampling; And with reference voltage relatively; Through comparator control triode, the triode control relay, thereby reach the control external power with by the purpose of trial product break-make.After the value of supply voltage overshoot outside, through the chain formation auto-lock function of the relay of relay, can release self-locking after fixing a breakdown through manual reset.
Claims (5)
1. the overvoltage protection in the electric equipment products testing stand is characterized in that comprising rectification filtering unit, comparing unit, driver element, relay unit, 15V Voltage stabilizing module and 28V Voltage stabilizing module; External power of alterating and direct current is leaded up to the normally closed contact of relay unit and directly is communicated with by the power circuit of trial product; Another road connection exports rectification filtering unit to; Rectification filtering unit receives the input of combined-voltage, exports signal to comparing unit joining with it; Comparing unit connects the 15V Voltage stabilizing module and obtains working power and reference voltage, and alternating current 220V input 28V power module obtains direct current 28V, offers the working power and the 15V reference voltage of the relay coil of relay unit; Comparing unit compares the external power voltage and the 15V reference voltage of the input of rectification filtering unit; After external power voltage exceeds reference voltage value; Output signal to and joining driver element after the comparing unit upset; Driver element control relay unit makes relay unit become disconnection by conducting, makes external power and is broken off by the power circuit of trial product; Between one group of normal opened contact of relay unit and direct current 28V, connect the self-locking SR.
2. the overvoltage protection in the electric equipment products testing stand according to claim 1; It is characterized in that: said relay unit comprises 3 relays, and one group of normally closed contact of each relay directly is communicated with external power of alterating and direct current and by the power circuit of trial product.
3. the overvoltage protection in the electric equipment products testing stand according to claim 1 is characterized in that: for DC over-voltage protection, and biasing resistor R in the comparing unit
5Be 10k Ω.
4. the overvoltage protection in the electric equipment products testing stand according to claim 1 is characterized in that: for the single phase alternating current (A.C.) overvoltage protection, and biasing resistor R in the comparing unit
5Be 20k Ω.
5. the overvoltage protection in the electric equipment products testing stand according to claim 1 is characterized in that: for three-phase alternating current overvoltage protection, R
5Resistance is 20k～40k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203023238U CN202183589U (en) | 2011-08-18 | 2011-08-18 | Over-voltage protection device in test platform of electrical product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203023238U CN202183589U (en) | 2011-08-18 | 2011-08-18 | Over-voltage protection device in test platform of electrical product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202183589U true CN202183589U (en) | 2012-04-04 |
Family
ID=46176611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203023238U Expired - Fee Related CN202183589U (en) | 2011-08-18 | 2011-08-18 | Over-voltage protection device in test platform of electrical product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202183589U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987694A (en) * | 2020-08-25 | 2020-11-24 | 国网冀北电力有限公司唐山供电公司 | Test area perimeter alarm and out-of-limit power-off device and method |
-
2011
- 2011-08-18 CN CN2011203023238U patent/CN202183589U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987694A (en) * | 2020-08-25 | 2020-11-24 | 国网冀北电力有限公司唐山供电公司 | Test area perimeter alarm and out-of-limit power-off device and method |
| CN111987694B (en) * | 2020-08-25 | 2022-07-08 | 国网冀北电力有限公司唐山供电公司 | Test area perimeter alarm and out-of-limit power-off device and method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120404 Termination date: 20150818 |
|
| EXPY | Termination of patent right or utility model |