CN201674224U - Reverse connection proof buffer protection device for direct current power supply input - Google Patents
Reverse connection proof buffer protection device for direct current power supply input Download PDFInfo
- Publication number
- CN201674224U CN201674224U CN2010201489421U CN201020148942U CN201674224U CN 201674224 U CN201674224 U CN 201674224U CN 2010201489421 U CN2010201489421 U CN 2010201489421U CN 201020148942 U CN201020148942 U CN 201020148942U CN 201674224 U CN201674224 U CN 201674224U
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- power supply
- relay
- buffer
- control circuit
- reverse connection
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Abstract
The utility model discloses a reverse connection proof buffer protection device for direct current power supply input, which is used for protecting a switch power supply. The utility model has the technical scheme that the reverse connection proof buffer protection device consists of a reverse connection proof diode, a buffer resistor, a relay, a buffer control circuit and an auxiliary power supply, wherein the normally open contacts of the relay are connected in the input loop of the switch power supply in series; the buffer control circuit controls the coil of the relay; after being connected with the buffer resistor in series, the reverse connection proof diode is connected with the normally open contacts of the relay in parallel; and the auxiliary power supply which supplies power to the relay and the buffer control circuit is one path of direct current power supply output by the switch power supply. The utility model not only has the reverse connection protection function for power supply input but also has the starting buffer action and can ensure that the switch power supply can work safely and reliably. Meanwhile, the circuit is simple and has the advantages of light weight, small volume, low cost, simple control, convenient operation and the like.
Description
Technical field
The utility model relates to a kind of device that has input both positive and negative polarity reverse connecting protection and DC power supply startup buffer protection function concurrently, belongs to power technique fields.
Background technology
The Switching Power Supply input voltage connects inverse time, might cause the device of power supply back to burn.In the prior art, the measure of prevention DC power supply input circuit reversal connection normally with a power diode inverse parallel in the Switching Power Supply input port, and seal in a protective tube in the input port, protective tube is positioned at the front of power diode.When input voltage connects inverse time, input voltage is by the power diode short circuit, and moment is burnt the protective tube of input port.The shortcoming of this protected mode is after protective tube blows, and needs opening power to change, take a lot of work and require great effort, and if the protective tube reaction speed slow, also might damage the device of power supply back.
In addition, when Switching Power Supply started, the initial stage charging that is accompanied by filter capacitor can produce and overcharge electric current, and this electric current can reach more than ten times of regular event electric current, caused diode, switching tube, fuse etc. to produce fault.For suppressing to overcharge electric current, the Switching Power Supply that has is at input series connection NTC thermistor.The NTC thermistor has negative temperature coefficient, and at the power initiation initial stage, its resistance is very big, can suppress to overcharge electric current; Along with the rising of temperature, the resistance of NTC thermistor diminishes gradually, and power consumption reduces gradually, but still will consume certain electric energy.The Switching Power Supply that also has is used fixed resistance to constitute and is overcharged current suppressing circuit, but sort circuit power consumption is very big in normal operation, to energy-conservation unfavorable.Though the method for employing switch element such as triode ac switch in parallel on fixed resistance can solve power problems, the used element of this method is more, the control circuit more complicated, and also the volume of equipment, weight and cost are also wanted corresponding increase.
The utility model content
The purpose of this utility model be to provide a kind of simple in structure, with low cost, easy to use, energy consumption is low and the DC power supply of dependable performance is imported anti-reverse buffer protection device.
The alleged problem of the utility model realizes with following technical proposals:
A kind of DC power supply is imported anti-reverse buffer protection device; form by anti-reverse diode, buffer resistance, relay, buffer control circuit and accessory power supply; the normally opened contact of described relay is serially connected with in the input circuit of Switching Power Supply; the coil of described buffer control circuit control relay; described anti-reverse diode be connected on the normally opened contact of relay after buffer resistance is connected in series, for the accessory power supply of relay and buffer control circuit power supply is the road DC power supply that Switching Power Supply is exported.
Above-mentioned DC power supply is imported anti-reverse buffer protection device, and described buffer control circuit is made of field effect transistor, electric capacity and two resistance, and the drain electrode of described field effect transistor meets accessory power supply V+ through the coil of relay, and source electrode meets the negative pole GND of accessory power supply; Described two resistance string are connected into bleeder circuit, and the voltage division signal of its serial connection point output connects the grid of field effect transistor, and described electric capacity is connected between the grid and source electrode of field effect transistor.
When utilizing buffer resistance to suppress Switching Power Supply to start, the utility model overcharges electric current; Relay normally open contact is used for behind power initiation the buffer resistance short circuit is made not consumed power of buffer resistance; The effect of anti-reverse diode is to stop reverse voltage to enter power supply inside.Because relay and buffering control circuit are powered by accessory power supply; and the road DC power supply that accessory power supply is a Switching Power Supply to be exported; only just can output voltage behind Switching Power Supply internal electrical rood electricity; thereby have only when the correct connection of power supply input; when voltage enters in the power supply through anti-reverse diode with buffering resistance; relay just may adhesive under the control of buffer control circuit; and when power supply input reversal connection; since anti-reverse diode every straight effect; the Switching Power Supply internal circuit can not get; accessory power supply is not worked; the impossible adhesive of relay, this has just effectively protected the device of power supply back, and this circuit itself can not be subjected to any damage yet; as long as correct wiring error, but power supply is with regard to operate as normal.
The utility model not only has power supply input reverse connecting protection function; also have the startup cushioning effect concurrently; can guarantee Switching Power Supply safety, work reliably, and circuit is extremely simple, have in light weight, volume is little, cost is low, control is simple, advantage such as easy to operate.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is an electrical schematic diagram of the present utility model.
Each label is among the figure: DC/DC, Switching Power Supply; AP, accessory power supply; J, relay; D, anti-reverse diode; Q, field effect transistor; C, electric capacity; R1～R3, resistance.
Embodiment
Referring to Fig. 1, the utility model is made up of the accessory power supply of anti-reverse diode D, buffer resistance R1, relay J, buffer control circuit and driving relay coil.Buffer control circuit by field effect transistor Q, capacitor C, (R2 R3) constitutes two resistance, and (R2 R3) is concatenated into bleeder circuit to two resistance.Accessory power supply AP (V+-GND) is the independent current source that winding is made of being drawn separately by the auxiliary supply transformer of power-supply device inside, because in power-supply device inside accessory power supply must be arranged, is very easy to so do one group of independently secondary road power supply.
This protective circuit realizes that operation principle anti-reverse and the buffering function is as follows:
When direct voltage by input port (Vin+-Vin-) when entering Switching Power Supply, at first by anti-reverse diode D, buffer resistance R1 enters DC/DC Switching Power Supply inside, this moment, the power supply input current just can slowly charge to the electric capacity of DC/DC Switching Power Supply inside etc. by buffer resistance R1, when the inner input voltage of power supply is elevated to a certain degree (this moment, the voltage at buffer resistance R1 two ends was very little), the accessory power supply AP of power supply inside just can start, the voltage of accessory power supply AP output is through resistance R 2, the R3 dividing potential drop, begin to charge to capacitor C, when the voltage on the capacitor C is elevated to the operation voltage of field effect transistor Q, relay J is adhesive automatically just, its normally opened contact is connected, buffer resistance R1 and anti-reverse diode D are by short circuit, and the input circuit of power-supply device is connected fully.
When the DC power supply both positive and negative polarity connects inverse time, because the unilateral conduction of anti-reverse diode D, make input direct voltage slowly to charge to electric capacity of power supply inside etc. by buffer resistance R1, thereby the accessory power supply of power supply inside can not normally be set up, the coil of relay J can not get driving voltage, the contact of relay J can't be closed, just successfully having blocked direct reverse voltage enters into power supply inside for this, avoided because input voltage connects and damages power supply on the contrary, and need not change any device again, as long as the polarity of direct voltage is corrected.
Claims (2)
1. a DC power supply is imported anti-reverse buffer protection device, it is characterized in that, it is made up of anti-reverse diode (D), buffer resistance (R1), relay (J), buffer control circuit and accessory power supply, the normally opened contact of described relay (J) is serially connected with in the input circuit of Switching Power Supply, the coil of described buffer control circuit control relay (J); Described anti-reverse diode (D) be connected on the normally opened contact of relay (J) after buffer resistance (R1) is connected in series, for the accessory power supply V+ of relay (J) and buffer control circuit power supply is the road direct voltage that Switching Power Supply is exported.
2. import anti-reverse buffer protection device according to the described DC power supply of claim 1, it is characterized in that, described buffer control circuit is made of field effect transistor (Q), electric capacity (C) and two resistance, the drain electrode of described field effect transistor (Q) meets accessory power supply V+ through the coil of relay (J), and source electrode meets the negative pole GND of accessory power supply; Described two resistance string are connected into bleeder circuit, and the voltage division signal of its serial connection point output connects the grid of field effect transistor (Q), and described electric capacity (C) is connected between the grid and source electrode of field effect transistor (Q).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201489421U CN201674224U (en) | 2010-04-02 | 2010-04-02 | Reverse connection proof buffer protection device for direct current power supply input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201489421U CN201674224U (en) | 2010-04-02 | 2010-04-02 | Reverse connection proof buffer protection device for direct current power supply input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674224U true CN201674224U (en) | 2010-12-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201489421U Expired - Fee Related CN201674224U (en) | 2010-04-02 | 2010-04-02 | Reverse connection proof buffer protection device for direct current power supply input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201674224U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142681A (en) * | 2010-12-23 | 2011-08-03 | 聚信科技有限公司 | Method and device for preventing input reverse-connection damage |
| CN102496923A (en) * | 2011-11-14 | 2012-06-13 | 株洲南车时代电气股份有限公司 | Input circuit with reverse connection preventing protection |
| CN104079166A (en) * | 2013-03-25 | 2014-10-01 | 艾默生网络能源系统北美公司 | Power supply circuit |
| CN105375460A (en) * | 2015-11-25 | 2016-03-02 | 珠海格力电器股份有限公司 | Power supply reverse connection prevention circuit and reverse connection prevention method thereof |
| CN106537713A (en) * | 2014-07-02 | 2017-03-22 | 戴尔菲技术公司 | Apparatus to provide reverse polarity protection |
| CN108183469A (en) * | 2018-01-02 | 2018-06-19 | 重庆长安汽车股份有限公司 | One kind prevents flash driving power reverse-connection protection circuit and entire car controller |
| CN112019013A (en) * | 2020-09-01 | 2020-12-01 | 北京理工华创电动车技术有限公司 | High-power DCDC anti-impact reverse-connection-prevention slow starting circuit and control method |
| CN112114276A (en) * | 2020-07-10 | 2020-12-22 | 青岛海信电子产业控股股份有限公司 | Control circuit, control panel, electric equipment and control method |
| CN113474965A (en) * | 2020-11-19 | 2021-10-01 | 深圳市华思旭科技有限公司 | Intelligent connecting device, starting power supply and storage battery clamp |
| CN113809730A (en) * | 2021-11-08 | 2021-12-17 | 深圳市高斯宝电气技术有限公司 | High-voltage direct-current input reverse connection protection circuit |
| CN114002612A (en) * | 2021-10-26 | 2022-02-01 | 珠海格力电器股份有限公司 | Reverse connection detection circuit and method and power supply system |
-
2010
- 2010-04-02 CN CN2010201489421U patent/CN201674224U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012083738A1 (en) * | 2010-12-23 | 2012-06-28 | 华为技术有限公司 | Method and device for preventing input reverse-connection damage |
| CN102142681A (en) * | 2010-12-23 | 2011-08-03 | 聚信科技有限公司 | Method and device for preventing input reverse-connection damage |
| CN102496923A (en) * | 2011-11-14 | 2012-06-13 | 株洲南车时代电气股份有限公司 | Input circuit with reverse connection preventing protection |
| CN104079166A (en) * | 2013-03-25 | 2014-10-01 | 艾默生网络能源系统北美公司 | Power supply circuit |
| US10320187B2 (en) | 2014-07-02 | 2019-06-11 | Aptiv Technologies Limited | Apparatus to provide reverse polarity protection |
| CN106537713A (en) * | 2014-07-02 | 2017-03-22 | 戴尔菲技术公司 | Apparatus to provide reverse polarity protection |
| CN106537713B (en) * | 2014-07-02 | 2019-03-01 | 戴尔菲技术公司 | The device of reverse polarity protection is provided |
| CN105375460A (en) * | 2015-11-25 | 2016-03-02 | 珠海格力电器股份有限公司 | Power supply reverse connection prevention circuit and reverse connection prevention method thereof |
| CN108183469A (en) * | 2018-01-02 | 2018-06-19 | 重庆长安汽车股份有限公司 | One kind prevents flash driving power reverse-connection protection circuit and entire car controller |
| CN112114276A (en) * | 2020-07-10 | 2020-12-22 | 青岛海信电子产业控股股份有限公司 | Control circuit, control panel, electric equipment and control method |
| CN112019013A (en) * | 2020-09-01 | 2020-12-01 | 北京理工华创电动车技术有限公司 | High-power DCDC anti-impact reverse-connection-prevention slow starting circuit and control method |
| CN113474965A (en) * | 2020-11-19 | 2021-10-01 | 深圳市华思旭科技有限公司 | Intelligent connecting device, starting power supply and storage battery clamp |
| CN114002612A (en) * | 2021-10-26 | 2022-02-01 | 珠海格力电器股份有限公司 | Reverse connection detection circuit and method and power supply system |
| CN113809730A (en) * | 2021-11-08 | 2021-12-17 | 深圳市高斯宝电气技术有限公司 | High-voltage direct-current input reverse connection protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20101215 Termination date: 20150402 |
|
| EXPY | Termination of patent right or utility model |