CN208316274U - A kind of overvoltage crowbar and electrical equipment - Google Patents

Abstract

The utility model embodiment discloses a kind of overvoltage crowbar and electrical equipment; the overvoltage crowbar passes through when the power input of electrical equipment accesses the power output end of power-supply device; the conducting of control module control switch module; and in the power output end of the output end of switch module access power-supply device; when the power input of electrical equipment does not access the power output end of power-supply device, switch module is closed.Overvoltage crowbar and electrical equipment provided by the embodiment of the utility model, can be by the way that when the power input of electrical equipment accesses the power output end of power-supply device, control module control switch module be connected；Enter the power output end of power-supply device in the output end misconnection of electrical equipment, and when the power input of electrical equipment does not have electric signal access, switch module is closed, and is realized to the over-voltage protecting function of electrical equipment, is guaranteed the stable operation and normal work of electrical equipment.

Description

A kind of overvoltage crowbar and electrical equipment

Technical field

The utility model embodiment is related to field of circuit technology more particularly to a kind of overvoltage crowbar and electrical equipment.

Background technique

Electrical equipment usually has the voltage rating of an operation, but in the process of running due to circuit loss, environment The influence of loss etc., causes it not work under rated voltage.It would generally be equipped with the range of an operating voltage, so that equipment It can operate normally within this range, once voltage is more than the range of this operating voltage, equipment will be damaged because of over-voltage.

When existing electrical equipment is powered, it is typically provided with input port and output port, due to current electrical equipment port Standardization, input port and output port be generally same model, this may cause the input terminal of electrical equipment Mouth and output port are obscured.When the power output end of power-supply device is reversely connected the output port into electrical equipment, so that electric appliance is set Standby output port voltage increases, and electrical equipment is caused to damage.To prevent over-voltage from leading to the damage of electrical equipment, usually in electric appliance Protection circuit is set in equipment.Existing overvoltage protection is generally used zener diode, but zener diode voltage is dynamically Protection scope is small, when the voltage limit that voltage can be born beyond zener diode, zener diode can be made to damage；Work as electric appliance When the output end setting diode in place zener diode of equipment carries out overvoltage protection to electrical equipment, it will have biggish voltage Dynamic protection range.

But existing diode usually has certain pressure drop, and changes as size of current changes, and causes to export Voltage can not have a stable voltage value to cause equipment damage to not can guarantee the normal work of equipment.

Utility model content

In view of this, the utility model embodiment provides a kind of overvoltage crowbar and electrical equipment, it is able to solve existing When thering is the power output end in technology because of power-supply device to be reversely connected the output port into electrical equipment, so that the output end of electrical equipment The technical issues of mouth voltage increases, electrical equipment is caused to damage.

In a first aspect, the utility model embodiment provides a kind of overvoltage crowbar, comprising: control module and switching molding Block；

Wherein, the input terminal of the control module is electrically connected with the power input of electrical equipment；The control module Output end is electrically connected with the control terminal of the switch module；The control module is used for the power input in the electrical equipment When accessing the power output end of power-supply device, control signal is sent to the switch module；

The input terminal of the switch module is electrically connected with the output end of electrical equipment；The output end of the switch module is institute State the output end of overvoltage crowbar；The switch module is used under control signal control be connected；In the electric appliance The power input of equipment does not access the power output end of the power-supply device, and described in the output end access of the switch module When the power output end of power-supply device, the switch module is closed.

Optionally, the circuit further include: electrostatic protection module；

The input terminal of the electrostatic protection module is electrically connected with the output end of the switch module；The electrostatic protection module Output end ground connection.

Optionally, the electrostatic protection module includes: two-way transient supression diode；

The first end of the two-way transient supression diode is electrically connected with the output end of the switch module；The two-way wink Become the second end ground connection for inhibiting diode.

Optionally, the control module includes: first resistor, second resistance and zener diode；

The first end of the first resistor is electrically connected with the power input of the electrical equipment；The of the first resistor Two ends are electrically connected with the first end of the second resistance；The second end of the second resistance is grounded；

The plus earth of the zener diode；The first end of the cathode of the zener diode and second resistance electricity Connection；The cathode of the zener diode is electrically connected with the control terminal of the switch module.

Optionally, the resistance value of the first resistor is 10K Ω~20K Ω；

The resistance value of the second resistance is 45K Ω~55K Ω.

Optionally, the switch module includes: metal-oxide-semiconductor；

The control terminal of the metal-oxide-semiconductor is electrically connected with the output end of the control module；The source electrode of the metal-oxide-semiconductor and the electricity The output end of device equipment is electrically connected；The drain electrode of the metal-oxide-semiconductor is the output end of the overvoltage crowbar.

Optionally, the metal-oxide-semiconductor is n channel enhancement type field effect transistor.

Second aspect, the utility model embodiment additionally provide a kind of electrical equipment, including input terminal interface, output End, output terminal interface and above-mentioned overvoltage crowbar；

The input terminal interface is electrically connected with the input terminal of control module in the overvoltage crowbar；The output end It is electrically connected with the input terminal of switch module in the overvoltage crowbar；The output terminal interface and the overvoltage crowbar Output end electrical connection.

The utility model embodiment provides a kind of overvoltage crowbar and electrical equipment, the overvoltage crowbar are provided with Control module and switch module, wherein the input terminal of control module is electrically connected with the power input of electrical equipment, control module Output end be electrically connected with the control terminal of switch module, the input terminal of switch module and the output end of electrical equipment connect electricity and connect, and open Output end of the output end of module as entire overvoltage crowbar is closed, power supply is accessed by the power input in electrical equipment When the power output end of equipment, control module sends control signal to switch module, so that switch module is connected, and in switching molding The power output end of the output end access power-supply device of block, the power supply that the power input of electrical equipment does not access power-supply device are defeated When outlet, switch module is closed, and is solved in the prior art since the input port of electrical equipment and output port are easy to obscure, So that the power output end of the output port access power-supply device of electrical equipment, causes electrical equipment output port overtension, And the technical issues of damaging electrical equipment.Over-voltage guarantor directly is carried out in the output end series diode of equipment relative to existing Shield, the electric signal that overvoltage crowbar provided by the embodiment of the utility model exports the output end of electrical equipment are more stable Property.Overvoltage crowbar and electrical equipment provided by the embodiment of the utility model, by by the input terminal and electric appliance of control module The power input of equipment is electrically connected, thus in the power input of the power output end access electrical equipment of power-supply device, Control module sends control signal to switch module, so that switch module is connected, the signal of electrical equipment output end output passes through Switch module steadily exports, and does not access the power output end of power-supply device in the power input of electrical equipment, and switch When the power output end of the output end access power-supply device of module, switch module is closed, and then prevents higher voltage access electricity The output end of device equipment is realized to the over-voltage protecting function of electrical equipment, guarantees the stable operation and normal work of electrical equipment.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of overvoltage crowbar provided by the embodiment of the utility model；

Fig. 2 is the structural schematic diagram of another overvoltage crowbar provided by the embodiment of the utility model；

Fig. 3 is a kind of physical circuit figure of overvoltage crowbar provided by the embodiment of the utility model；

Fig. 4 is a kind of structural schematic diagram of electrical equipment provided by the embodiment of the utility model.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.Do not conflicting In the case where, the feature in the utility model embodiment and embodiment can be combined with each other.

Overvoltage crowbar provided in this embodiment can be adapted for the case where carrying out overvoltage protection to equipment output end.Figure 1 is a kind of structural schematic diagram of overvoltage crowbar provided by the embodiment of the utility model.Shown in Figure 1, the present embodiment mentions The overvoltage crowbar 100 of confession is configured with: control module 10 and switch module 20.Wherein, the input terminal of control module 10 and electricity The power input of device equipment 200 is electrically connected；The output end of control module 10 is electrically connected with the control terminal of switch module 20；Control Module 10 is used to send out in the power output end of the power input access power-supply device of electrical equipment 200 to switch module 20 Send control signal；The input terminal of switch module 20 is electrically connected with the output end of electrical equipment 200；The output end of switch module 20 is The output end of overvoltage crowbar 100；Switch module 20 is used under the control signal control that control module 10 is sent be connected；? The power input of electrical equipment 200 does not access the power output end of power-supply device, and the output end of switch module 20 accesses electricity When the power output end of source device, switch module 20 is closed.

Specifically, power input port and signal output port are provided in electrical equipment, the power input of electrical equipment Port is used for input power signal, provides electric energy for electrical equipment operation；The signal output port of electrical equipment can connect other Equipment provides electric signal for other equipment.Currently, to meet universal input output end standard, the power input of electrical equipment Mouth is identical as signal output port, but the input power signal of electrical equipment is usually above the letter of its signal output port output Number, when input power signal to be reversely connected to the signal output port into electrical equipment, signal output port voltage can be made to increase, To cause electronic component in electrical equipment to damage.

As shown in Figure 1, overvoltage crowbar 100 provided by the embodiment of the utility model is provided with control module 10 and switch Module 20 is electrically connected, when electrical equipment 200 with the power input of electrical equipment 200 by the input terminal of control module 10 When power input accesses the power output end of power-supply device, the input terminal of control module 10 will input an electric signal, control mould The electric signal is converted to the control signal that control switch module 20 is connected by block 10.To be received in the control terminal of switch module 20 It is connected when to the control signal, so that the signal that the output end of electrical equipment 200 exports steadily is exported by switch module 20. And when the power output end misconnection of power-supply device enters the output end of switch module 20, the power input of electrical equipment 200 is not There is electric signal input again, i.e. the input terminal of control module 10 is not having electric signal input, and control module 10 is not to switch module 20 Control signal is sent, switch module 20 is closed.Voltage signal to prevent 20 output end of switch module excessively high is input to electric appliance The output end of equipment 200 causes the damage of electronic component in electrical equipment 200.

Illustratively, by the power input of the input terminal Yu electrical equipment 200 of control module 10 in overvoltage crowbar 100 End connection, the input terminal of switch module 20 is connect with the output end of electrical equipment 200, and the output end of switch module 20 was used as The output end of voltage protection circuit 100.When to 200 input power of electrical equipment, need to connect the power output end of power-supply device Enter the power input of electrical equipment 200, if but by the output end of the output port of power source of power-supply device and electrical equipment 200 When connection, electrical equipment 200 can be damaged.The switch module in the output end electrical connection overvoltage crowbar 100 of electrical equipment 200 20 input terminal, the power input of electrical equipment 200 are electrically connected the input terminal of control module 10 in overvoltage crowbar 100, When the power output end mistake of power-supply device is connect with 20 output end of switch module of overvoltage crowbar 100, control module 10 Input terminal is inputted without electric signal, and control module 10 sends control signal without normal direction switch module 20, and switch module 20 is to close shape State, so that output end input electrical signal of the power output end of power-supply device to electrical equipment 200 is prevented, so that overvoltage protection is electric Play the role of overvoltage protection to electrical equipment 200 in road 100；And when the output end of overvoltage crowbar 100 is as equipment 200 Output end, when the power input of power-supply device accurately accesses the power input of electrical equipment 200, i.e. control module 10 Input terminal input electrical signal, and convert control signal for the electric signal and be sent to switch module 20, so that switch module 20 is led Electric signal normal transmission logical, that 200 output end of electrical equipment exports, guarantee electrical equipment 200 and other signals receiving device It operates normally.

Overvoltage crowbar provided by the embodiment of the utility model, by by the input terminal of control module and electrical equipment Power input electrical connection, to control mould in the power input of the power output end access electrical equipment of power-supply device Block sends control signal to switch module, so that switch module is connected, the signal of electrical equipment output end output passes through switching molding Block steadily exports, and does not access the power output end of power-supply device in the power input of electrical equipment, and switch module When output end accesses the power output end of power-supply device, switch module is closed, and then prevents higher voltage access electrical equipment Output end, realize to the over-voltage protecting function of electrical equipment, guarantee the stable operation and normal work of electrical equipment.

Optionally, overvoltage crowbar provided by the embodiment of the utility model further includes electrostatic protection module, and the electrostatic is anti- Shield module can play electrostatic protective function.Fig. 2 is the structure of another overvoltage crowbar provided by the embodiment of the utility model Schematic diagram.As shown in Fig. 2, overvoltage crowbar 100 provided by the embodiment of the utility model includes control module 10, switch module 20 and electrostatic protection module 30.Wherein, the output end of the input terminal with switch module 20 of electrostatic protection module 30 is electrically connected, The output end of electrostatic protection module 30 is grounded.

Specifically, electrostatic is separated and is generated after being contacted by the object of two unlike materials.It is set in user using electric appliance , can be because of the touching electrical equipment such as plug power supply when standby, electrostatic charge caused by electrical equipment can be absorbed by the body and accumulate at this time Get up, when the accumulation of electric energy to a certain degree when, personal safety will be threatened；Meanwhile the presence of electrostatic will also damage in electrical equipment Electronic component.As shown in Fig. 2, the utility model embodiment in overvoltage crowbar 100 by being arranged electrostatic protection mould Block 30, and the input terminal of electrostatic protection module 30 is connect with the output end of switch module 20, the output of electrostatic protection module 30 End ground connection can be such that the electrostatic generated in electrical equipment 200 is eliminated by the ground connection of electrostatic protection module 30, to protect electricity Electronic component in device equipment 200, and protection use the personal safety of the user of the electrical equipment 200.

Optionally, the specific implementation procedure of overvoltage crowbar is related to the specific electronic component in its circuit.Fig. 3 is A kind of physical circuit figure of overvoltage crowbar provided by the embodiment of the utility model.As shown in figure 3, the utility model embodiment The control module 10 of the overvoltage crowbar 100 of offer is chosen as including first resistor R1, second resistance R2 and zener diode D1.Wherein, the first end of first resistor R1 is electrically connected with the power input of electrical equipment 200, the second end of first resistor R1 It is electrically connected with the first end of second resistance R2, the second end ground connection of second resistance R2；The plus earth of zener diode D1, pressure stabilizing The cathode of diode D1 is electrically connected with the first end of second resistance R2, control of the cathode of zener diode D1 also with switch module 20 End electrical connection processed.

Specifically, as shown in figure 3, control module 10 is provided with specific control circuit in the utility model embodiment, In the control circuit, the electric signal of 200 power input of electrical equipment access is divided by first resistor R1 and the second electricity R2 current limliting is hindered, control signal is converted to.And zener diode D1 can make the telecommunications for controlling power supply VCC as clamp diode The control signal for number carrying out changing after partial pressure and current limliting is kept constant, so that the voltage signal that will control power supply VCC input is kept For the control signal that switch module 20 is connected.Wherein, the resistance value of first resistor is chosen as 10K Ω~20K Ω, preferably 15K Ω, the resistance value of second resistance are chosen as 45K Ω~55K Ω, preferably 51K Ω.

Correspondingly, with continued reference to shown in Fig. 3, switching molding in overvoltage crowbar 100 provided by the embodiment of the utility model Block 20 is chosen as including metal-oxide-semiconductor Q.Wherein, the output end of the control terminal with control module 10 of metal-oxide-semiconductor Q is electrically connected, the source of metal-oxide-semiconductor Q Pole is electrically connected with the output end of equipment 200；The drain electrode of metal-oxide-semiconductor Q is the output end of overvoltage crowbar 100.

Specifically, since metal-oxide-semiconductor control mode is more convenient, have small in size, light-weight, the service life is long, thermal stability is good, Strong antijamming capability and it is low in energy consumption the advantages that, and be used as switch element.But it is influenced by production technology, the leakage of metal-oxide-semiconductor It usually there will be parasitic diode between pole and substrate, the substrate of metal-oxide-semiconductor is usually connect with its source electrode, therefore the parasitic diode It can be present between the source electrode and drain electrode of metal-oxide-semiconductor, the equivalent circuit diagram of usual metal-oxide-semiconductor, be had between the source electrode and drain electrode of metal-oxide-semiconductor One parasitic diode exists.As shown in figure 3, the metal-oxide-semiconductor Q of switch module 20 is chosen as N-channel increasing in the utility model embodiment Strong type field effect transistor, there are a parasitic diode D2 between the source electrode and drain electrode of metal-oxide-semiconductor Q, parasitic diode D2's In the presence of water conservancy diversion can be carried out to the larger moment reverse current generated in circuit, to keep metal-oxide-semiconductor Q not breakdown, to metal-oxide-semiconductor Q Play the role of protection.

In addition, as shown in figure 3, electrostatic protection module 30 is chosen as including two-way transient supression diode T.The two-way transition The first end of diode T is inhibited to be electrically connected with the output end of switch module 10；The second termination of two-way transient supression diode T Ground.

Specifically, it can be with high speed when the high energy impact events for receiving moment of two-way transient supression diode T Degree reduces the impedance of itself, while absorbing the electric current generated by high energy impact events, and by the height of moment by way of ground connection The voltage that energy impact generates discharges, thus prevent each electronic component in overvoltage crowbar 100 and electrical equipment 200 because By transient state high-energy impact and damage.

As shown in figure 3, overvoltage crowbar 100 provided by the embodiment of the utility model includes first resistor R1, the second electricity Hinder R2, zener diode D1, metal-oxide-semiconductor Q and two-way transient supression diode T.The first end and electrical equipment of first resistor R1 200 power input electrical connection, the second end of first resistor R1 are electrically connected with the first end of second resistance R2, second resistance R2 Second end ground connection；The plus earth of zener diode D1, the cathode of zener diode D1 and the first end electricity of second resistance R2 Connection；The cathode of zener diode D1 is electrically connected with the control terminal of metal-oxide-semiconductor Q；The output of the source electrode and electrical equipment 200 of metal-oxide-semiconductor Q End electrical connection, the drain electrode of metal-oxide-semiconductor Q are the output end of overvoltage crowbar 100；The first end of two-way transient supression diode T with The drain electrode of metal-oxide-semiconductor Q is electrically connected, the second end ground connection of two-way transient supression diode T.Wherein, in equivalent circuit diagram, metal-oxide-semiconductor Q In further include a parasitic diode D2, the anode of the parasitic diode is electrically connected with the source electrode of metal-oxide-semiconductor Q, parasitic diode D2's Cathode is electrically connected with the drain electrode of metal-oxide-semiconductor Q.

The telecommunications for being inputted the power input of electrical equipment 200 by first resistor R1 partial pressure and second resistance R2 current limliting Number, be converted to the control signal of control metal-oxide-semiconductor Q conducting；The control signal is clamped by zener diode D1, remains MOS The Continuity signal of pipe Q.Such as be connected when metal-oxide-semiconductor control terminal inputs 7.5V electric signal, it can will control the telecommunications of power supply VCC input Number through first resistor R1 and second resistance R2 carry out partial pressure and current limliting after obtain 7.5V control signal, the pincers of zener diode D1 Position effect can make the control signal keep 7.5V constant, to adapt to the on state characteristic of metal-oxide-semiconductor Q.

The source electrode of metal-oxide-semiconductor Q is electrically connected with the output end of electrical equipment 200, receives the output electric signal of electrical equipment 200, And the drain electrode of metal-oxide-semiconductor Q is the output end of overvoltage crowbar 100.When the power output end misconnection of power-supply device enters overvoltage protection When the output end of circuit 100, the power input of electrical equipment 200 will be inputted without electric signal, i.e., metal-oxide-semiconductor Q can not be connected, electricity The signal of 200 output end of device equipment will not be exported, while by the power-supply device electricity of the output end of overvoltage crowbar 100 access The power supply signal of source output terminal output can not also input in electrical equipment 200, to play overvoltage protection to electrical equipment 200 Effect.

In addition, quiet to being generated in overvoltage crowbar 100 and electrical equipment 200 by two-way transient supression diode T Electricity is collected, and by Electro-static Driven Comb by way of ground connection, to prevent in overvoltage crowbar 100 and electrical equipment 200 Each electronic component damaged due to by the electrostatic impact of transient state high-energy.

On the basis of the various embodiments described above, the utility model embodiment additionally provides a kind of electrical equipment, which sets Be provided with overvoltage crowbar provided by the embodiment of the utility model in standby, so as to the output end in electrical equipment be reversely connected into When the power output end of power-supply device, electrical equipment output end is avoided to input excessively high power supply, so that electrical equipment damage shows As generating.Fig. 4 is a kind of structural schematic diagram of electrical equipment provided by the embodiment of the utility model.As shown in figure 4, this is practical new Type embodiment provide electrical equipment 200 include: input terminal interface 210, output end 220, output terminal interface 230 and Overvoltage crowbar 100 provided by the embodiment of the utility model.Wherein, in input terminal interface 210 and overvoltage crowbar 100 The input terminal of control module is electrically connected；Output end 220 is electrically connected with the input terminal of switch module in overvoltage crowbar 100；It is defeated Terminal interface 220 is electrically connected with the output end of overvoltage crowbar 100 out.

Specifically, the output end of electrical equipment is mistaken for when accessing biggish input power signal for power input, electricity Electronic component in device equipment will be damaged.As shown in figure 4, in electrical equipment 200 provided by the embodiment of the utility model It is provided with overvoltage crowbar 100 provided by the embodiment of the utility model, and the overvoltage crowbar 100 is arranged and is set in electric appliance In standby 200, it is electrically connected respectively with the input terminal interface 210 of electrical equipment 200, output end 220, output terminal interface 230, from And enable the output end 220 of electrical equipment 200 by the normally output signal of overvoltage crowbar 100, while in electric appliance The output terminal interface 230 of equipment 200 is reversely connected into input power signal, and input terminal interface 210 does not access input power When signal, overvoltage crowbar 100 can be prevented in input power signal input electrical equipment 200, so that electric appliance is set Standby 200 have the function of overvoltage protection.

Electrical equipment provided by the embodiment of the utility model passes through overvoltage crowbar provided by the embodiment of the utility model Overvoltage protection is carried out, to make electrical equipment stable operation and normal work.

Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended Scope of the claims determine.

Claims (8)

1. a kind of overvoltage crowbar characterized by comprising control module and switch module；

Wherein, the input terminal of the control module is electrically connected with the power input of electrical equipment；The output of the control module End is electrically connected with the control terminal of the switch module；The control module is used to access in the power input of the electrical equipment When the power output end of power-supply device, control signal is sent to the switch module；

The input terminal of the switch module is electrically connected with the output end of electrical equipment；The output end of the switch module is the mistake The output end of voltage protection circuit；The switch module is used under control signal control be connected；In the electrical equipment Power input does not access the power output end of the power-supply device, and the output end of the switch module accesses the power supply and sets When standby power output end, the switch module is closed.

2. circuit according to claim 1, which is characterized in that further include: electrostatic protection module；

The input terminal of the electrostatic protection module is electrically connected with the output end of the switch module；The electrostatic protection module it is defeated Outlet ground connection.

3. circuit according to claim 2, which is characterized in that the electrostatic protection module includes: two-way transient supression two Pole pipe；

The first end of the two-way transient supression diode is electrically connected with the output end of the switch module；The two-way transition suppression The second end of diode processed is grounded.

4. circuit according to claim 1, which is characterized in that the control module include: first resistor, second resistance and Zener diode；

The first end of the first resistor is electrically connected with the power input of the electrical equipment；The second end of the first resistor It is electrically connected with the first end of the second resistance；The second end of the second resistance is grounded；

The plus earth of the zener diode；The cathode of the zener diode and the first end of the second resistance are electrically connected It connects；The cathode of the zener diode is electrically connected with the control terminal of the switch module.

5. circuit according to claim 4, which is characterized in that the resistance value of the first resistor is 10K Ω~20K Ω；

The resistance value of the second resistance is 45K Ω~55K Ω.

6. circuit according to claim 1, which is characterized in that the switch module includes: metal-oxide-semiconductor；

The control terminal of the metal-oxide-semiconductor is electrically connected with the output end of the control module；The source electrode of the metal-oxide-semiconductor is set with the electric appliance Standby output end electrical connection；The drain electrode of the metal-oxide-semiconductor is the output end of the overvoltage crowbar.

7. circuit according to claim 6, which is characterized in that the metal-oxide-semiconductor is n channel enhancement type field effect transistor.

8. a kind of electrical equipment characterized by comprising input terminal interface, output end, output terminal interface and right It is required that 1~7 described in any item overvoltage crowbars；

The input terminal interface is electrically connected with the input terminal of control module in the overvoltage crowbar；The output end and institute State the input terminal electrical connection of switch module in overvoltage crowbar；The output terminal interface is defeated with the overvoltage crowbar Outlet electrical connection.