CN208797565U - A kind of overvoltage crowbar for direct current operative power source input - Google Patents
A kind of overvoltage crowbar for direct current operative power source input Download PDFInfo
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- CN208797565U CN208797565U CN201820809661.2U CN201820809661U CN208797565U CN 208797565 U CN208797565 U CN 208797565U CN 201820809661 U CN201820809661 U CN 201820809661U CN 208797565 U CN208797565 U CN 208797565U
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- divider resistance
- voltage
- direct current
- power source
- converter
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Abstract
The utility model provides a kind of overvoltage crowbar for direct current operative power source input; including three-phase alternating current source, rectifier, protection circuit, DC/DC converter; the three-phase alternating current source, rectifier, DC/DC converter are sequentially connected electrically; the input terminal of the protection circuit is connected in parallel between rectifier and DC/DC converter, and the output end of circuit is protected to connect with DC/DC transducer signal；The utility model can solve external equipment input voltage moment excessively high the problem of causing power supply to damage.Described protects circuit on the basis of not changing original hardware circuit design, and only increasing a small amount of component can be realized over-voltage protecting function, can be used as a kind of electrical source input overvoltage protection circuit scheme of low cost.
Description
Technical field
The utility model belongs to Motor Control Field, protects more particularly, to a kind of over-voltage for direct current operative power source input
Protection circuit.
Background technique
To power supply, more stringent requirements are proposed for the fast development of economic and technical, and direct current operative power source is as substation
In for secondary device power supply core component, need to have very reliable uninterrupted power supply ability.In recent years, with photovoltaic
It is continued to develop for the New Energy Industry of representative, some large-sized photovoltaic surface power stations are come into being.Compared with traditional power station, photovoltaic
Though power station has many advantages, such as environmentally protective, it often has power swing, switching overvoltage etc. in the process of running
Event occurs, especially switching overvoltage (i.e. Guangdong power system when, the inverter in photovoltaic plant can cause alternate transient state mistake
Voltage), as shown in Figure 1, the ceiling voltage (300 volts of phase voltage or so) for allowing to input often beyond direct current operative power source, is caused
Direct current operative power source excessive pressure damages.It is protected by way of adding over-voltage protector, one side volume is big, at high cost, separately
On the one hand this protector has service life limitation, and the later period, there is still a need for maintenances.
Utility model content
In view of this, the utility model is directed to, one kind is at low cost, unprotect number limits, protection scope can flexibly match
The overvoltage crowbar for direct current operative power source input set.
In order to achieve the above objectives, the technical solution of the utility model is achieved in that
A kind of overvoltage crowbar for direct current operative power source input, including three-phase alternating current source, rectifier, protection electricity
Road, DC/DC converter, the three-phase alternating current source, rectifier, DC/DC converter are sequentially connected electrically, the protection circuit
Input terminal is connected in parallel between rectifier and DC/DC converter, and the output end of circuit and DC/DC transducer signal is protected to connect
It connects；
Protection circuit includes divider resistance, voltage-stablizer IC1 and optocoupler IC2, the divider resistance and voltage-stablizer IC1 coupling
It connects, voltage-stablizer IC1 and optocoupler IC2 are coupled.
Further, divider resistance guarantor includes the first divider resistance R1 and the second divider resistance R2, the first partial pressure electricity
Resistance R1 is connect with the input terminal of voltage-stablizer IC1 respectively with the output end of the second divider resistance R2.
Further, also connect a current-limiting resistance R3 between the voltage-stablizer and optocoupler, the current-limiting resistance R3 use
Stable driving current is provided to optocoupler in power supply.
Further, it is also parallel between the output end of first divider resistance and the output end of the second divider resistance
One capacitor C1, the capacitor C1 is used for filtering interference signals.
Compared with the existing technology, a kind of overvoltage crowbar for direct current operative power source input described in the utility model
It has the advantage that
The utility model can solve external equipment input voltage moment excessively high the problem of causing power supply to damage.Described
Protect circuit on the basis of not changing original hardware circuit design, only increasing a small amount of component can be realized overvoltage protection function
Can, it can be used as a kind of electrical source input overvoltage protection circuit scheme of low cost；The threshold value of the overvoltage protection of the utility model
It can be set according to divider resistance R1 and R2 resistance value is freely adjusted.
The utility model can guarantee that input AC line voltage is not damaged electric power generating composition at 700 volts or more at least, improve
Power supply impact resistance and the reliability protection circuit are divided into two parts, and first part is the identification electricity of moment input over-voltage
Road, second part are the protection control circuits for power driving circuit.
Detailed description of the invention
The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new
The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.?
In attached drawing:
Fig. 1 is circuit diagram described in the utility model embodiment；
Fig. 2 is system connection schematic diagram described in the utility model embodiment.
Specific embodiment
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For limitations of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.It is in the description of the present invention, unless another
It is described, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State the concrete meaning of term in the present invention.
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of overvoltage crowbar for direct current operative power source input, including three-phase alternating current source, rectifier, protection electricity
Road, DC/DC converter, the three-phase alternating current source, rectifier, DC/DC converter are sequentially connected electrically, the protection circuit
Input terminal is connected in parallel between rectifier and DC/DC converter, and the output end of circuit and DC/DC transducer signal is protected to connect
It connects；
Protection circuit includes divider resistance, voltage-stablizer IC1 and optocoupler IC2, the divider resistance and voltage-stablizer IC1 coupling
It connects, voltage-stablizer IC1 and optocoupler IC2 are coupled.
The divider resistance guarantor includes the first divider resistance R1 and the second divider resistance R2, the first divider resistance R1 and second
The output end of divider resistance R2 is connect with the input terminal of voltage-stablizer IC1 respectively.
The current-limiting resistance R3, the current-limiting resistance R3 that also connect between the voltage-stablizer and optocoupler is used for power supply to light
Coupling provides stable driving current.
A capacitor C1 is also parallel between the output end of first divider resistance and the output end of the second divider resistance,
The capacitor is used for filtering interference signals.
The concrete operating principle of the utility model: existing direct current operative power source passes through rectifier after being electrically accessed three-phase alternating current
It is rectified, the bus after rectification carries out control transformation via DC-DC converter, realizes the output for pressing setting value.Such as Fig. 2 institute
Show, protection circuit part is added on the basis of conventional design, and protection circuit acquires busbar voltage, and according to the big of busbar voltage
It is small to judge whether to act.When detecting that busbar voltage is excessively high, protection circuit triggering closes enable signal and gives DC-DC control unit
Point, so that it is stopped working, bears this over-voltage by bus capacitor at this time, switching circuit portion will not be damaged.To overvoltage impact
Disappearing is that busbar voltage is restored to normality threshold, and protection circuit restores enable signal automatically and gives the control section DC-DC, power up
Work.
Shown in Fig. 1, the utility model mainly includes adjustable high precision voltage-stablizer IC1, optocoupler IC2.Busbar voltage Pbus warp
It is divided by divider resistance R1, R2, the comparison voltage as IC1.When voltage is more than 2.5V, between the anode of IC1, cathode
Conducting is formed, for Vcc after the current limliting of resistance R3, providing suitable driving current to IC2 optocoupler primary side makes its secondary side conducting, will
DC-DC enable signal EN_driver is pulled to low level, closes DC-DC switch control.AC input lines voltage Vi, busbar voltage
Relationship between Pbus, comparison voltage Vr is Vr=Pbus × (R2/ (R1+R2)), wherein Pbus=1.414Vi.It can be according to this
Relationship freely adjusts the resistance value of R1, R2, and the comparing voltage value after dividing its overvoltage protection critical value with bus is corresponding, realizes defeated
Enter overvoltage protection.
The utility model relates to input voltage protected modes, can be applied directly to direct current operative power source, Switching Power Supply, fill
In the control circuit of the AC-DC modules such as motor module and other similar input overvoltage protection place.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (4)
1. a kind of overvoltage crowbar for direct current operative power source input, it is characterised in that: including three-phase alternating current source, rectification
Device, protection circuit, DC/DC converter, the three-phase alternating current source, rectifier, DC/DC converter are sequentially connected electrically, described
The input terminal of protection circuit is connected in parallel between rectifier and DC/DC converter, and the output end of circuit and DC/DC is protected to convert
The connection of device signal；
Protection circuit includes divider resistance, voltage-stablizer IC1 and optocoupler IC2, and the divider resistance and voltage-stablizer IC1 are coupled, surely
Depressor IC1 and optocoupler IC2 is coupled.
2. a kind of overvoltage crowbar for direct current operative power source input according to claim 1, it is characterised in that: institute
The divider resistance guarantor stated includes the first divider resistance R1 and the second divider resistance R2, the first divider resistance R1 and the second divider resistance R2
Output end connect respectively with the input terminal of voltage-stablizer IC1.
3. a kind of overvoltage crowbar for direct current operative power source input according to claim 1, it is characterised in that: institute
It also connects between the voltage-stablizer and optocoupler stated a current-limiting resistance, the current-limiting resistance provides stable drive to optocoupler for power supply
Streaming current.
4. a kind of overvoltage crowbar for direct current operative power source input according to claim 2, it is characterised in that: institute
A capacitor is also parallel between the output end for the first divider resistance stated and the output end of the second divider resistance, the capacitor is used
In filtering interference signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820809661.2U CN208797565U (en) | 2018-05-24 | 2018-05-24 | A kind of overvoltage crowbar for direct current operative power source input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820809661.2U CN208797565U (en) | 2018-05-24 | 2018-05-24 | A kind of overvoltage crowbar for direct current operative power source input |
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| Publication Number | Publication Date |
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| CN208797565U true CN208797565U (en) | 2019-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820809661.2U Active CN208797565U (en) | 2018-05-24 | 2018-05-24 | A kind of overvoltage crowbar for direct current operative power source input |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103922A (en) * | 2020-08-13 | 2020-12-18 | 珠海格力电器股份有限公司 | Power supply protection device, method and driver |
-
2018
- 2018-05-24 CN CN201820809661.2U patent/CN208797565U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103922A (en) * | 2020-08-13 | 2020-12-18 | 珠海格力电器股份有限公司 | Power supply protection device, method and driver |
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