CN207677431U - A kind of overvoltage crowbar and Switching Power Supply - Google Patents

A kind of overvoltage crowbar and Switching Power Supply Download PDF

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Publication number
CN207677431U
CN207677431U CN201721577057.3U CN201721577057U CN207677431U CN 207677431 U CN207677431 U CN 207677431U CN 201721577057 U CN201721577057 U CN 201721577057U CN 207677431 U CN207677431 U CN 207677431U
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module
output
unit
input terminal
signal
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王智勇
王平
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Hefei Huike Jinyang Technology Co Ltd
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Hefei Huike Jinyang Technology Co Ltd
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Abstract

The utility model discloses a kind of overvoltage crowbar and Switching Power Supplies, wherein overvoltage crowbar passes through the AC signal outside input module reception by the sampled signal outside the reception of over-pressed detection module.When the voltage of sampled signal is less than or equal to predetermined threshold value, over-pressed detection module control switch module is in the conduction state, and output module exports power supply signal;When the voltage of sampled signal is more than predetermined threshold value, over-pressed detection module control switch module is off, and output module stops output power supply signal.Switching Power Supply includes overvoltage crowbar, electric power management circuit and ac-dc converter circuit.Ac-dc converter circuit is power supply for electrical equipment for accessing alternating current to be converted to direct current.Electric power management circuit is used to control the working condition of ac-dc converter circuit according to the power supply signal that overvoltage crowbar exports.The utility model realizes the overvoltage protection to circuit, prevents too high voltages from being damaged to circuit components.

Description

A kind of overvoltage crowbar and Switching Power Supply
Technical field
The utility model is related to power technique fields more particularly to a kind of overvoltage crowbar and Switching Power Supplies.
Background technology
According to the design standard of current Switching Power Supply, input voltage is set within the scope of exchange 90V-264V.Big portion of China The alternating current of region-by-region can meet this standard, however, in some Special sections, such as remote mountain areas or third country, by It is unstable in power supply system, cause line voltage extremely unstable, sometimes line voltage is also possible to be more than 380V.This pole High voltage can cause Switching Power Supply irreversible damage, in some instances it may even be possible to cause the disasters such as on fire.If in order to avoid this Situation improves the specification of component in Switching Power Supply, for example the rated voltage of capacitance is set as 600V, improves metal-oxide-semiconductor and Schottky Pressure resistance etc., can all cause device cost to increase even double, general manufacturer will not use such way.
To sum up, exist in the prior art due to line voltage shakiness, the component of Switching Power Supply can be damaged, shadow The problem of ringing service life.
Utility model content
The utility model embodiment provides a kind of overvoltage crowbar and Switching Power Supply, it is intended to solve in the prior art It is existing due to line voltage shakiness, the problem of damaging to the component of Switching Power Supply, influence service life.
The first aspect of the utility model embodiment provides a kind of overvoltage crowbar, including over-pressed detection module, opens Close module, input module and output module.
The controlled end of the output end connecting valve module of over-pressed detection module, the output end connecting valve module of input module Input terminal, switch module output end connection output module input terminal.
Sampled signal outside the input terminal reception of over-pressed detection module, over-pressed detection module are opened according to sampled signal control Module is closed between conducting state and off-state to switch.
When the voltage of sampled signal is less than or equal to predetermined threshold value, over-pressed detection module control switch module is on State is connected between the input terminal and output end of switch module;When the voltage of sampled signal is more than predetermined threshold value, overvoltage detection Module control switch module is off, the input terminal of switch module and output end it is separated.
AC signal outside the input terminal reception of input module, input module carry out rectifying and wave-filtering processing to AC signal Direct current signal is exported afterwards to the input terminal of switch module.
When switch module is in the conduction state, the output end of switch module exports direct current signal to output module, output Module carries out direct current signal to export power supply signal after current limliting is filtered.
When switch module is off, output module stops output power supply signal.
In one embodiment, over-pressed detection module includes partial pressure unit and comparing unit.
The input terminal of partial pressure unit is the input terminal of over-pressed detection module, the output end connection comparing unit of partial pressure unit Input terminal, the output end of comparing unit are the output end of over-pressed detection module.
Partial pressure unit accesses after sampled signal carries out voltage division processing output buck sampled signal to comparing unit, comparing unit According to the voltage swing of decompression sampled signal, control switch module is off or conducting state.
In one embodiment, partial pressure unit includes first resistor, second resistance, 3rd resistor and the first capacitance.
The first end of first resistor is the input terminal of partial pressure unit, and the second of first resistor terminates the first of second resistance End, the second end of second resistance and the first end of 3rd resistor and the first end of the first capacitance connect the output to form partial pressure unit altogether The second end of end, the second end of 3rd resistor and the first capacitance is connected to ground altogether.
In one embodiment, comparing unit includes adjustable accurate shunt regulator and the second capacitance.
The reference pole of adjustable accurate shunt regulator connects the input to form comparing unit altogether with the first end of the second capacitance The second end of end, the cathode of adjustable accurate shunt regulator and the second capacitance connects the output end to form comparing unit altogether, adjustable Save the plus earth of precision shunt voltage-stablizer.
In one embodiment, switch module includes drop stream unit and switch pipe unit.
The first end of drop stream unit and the hot end of switch pipe unit connect the input terminal to form switch module altogether, and drop stream is single The second end of member and the controlled end of switch pipe unit connect the controlled end to form switch module altogether, and the cold end for switching pipe unit is The output end of switch module.
In one embodiment, switch pipe unit includes the first triode.
The base stage of first triode is to switch the controlled end of pipe unit, the current collection extremely switching tube unit of the first triode Hot end, the cold end of the transmitting extremely switching tube unit of the first triode.
In one embodiment, input module includes current limiting unit, rectification unit and filter unit.
The input terminal of current limiting unit is the input terminal of input module, the input of the output end connection rectification unit of current limiting unit End, the output end of rectification unit and the input terminal of filter unit connect the output end to form input module, the output of filter unit altogether End ground connection.
The second aspect of the utility model embodiment provides a kind of Switching Power Supply, including overvoltage protection as described above electricity Road further includes electric power management circuit and ac-dc converter circuit.
Overvoltage crowbar is connect with electric power management circuit and ac-dc converter circuit respectively, and electric power management circuit is straight with friendship Flow conversion circuit connection.
Ac-dc converter circuit exports sampled signal and AC signal to overvoltage crowbar respectively.
When the voltage of sampled signal is less than or equal to predetermined threshold value, overvoltage crowbar is exported according to AC signal and is powered Signal is to electric power management circuit, so that electric power management circuit control ac-dc converter circuit work.
When the voltage of sampled signal is more than predetermined threshold value, overvoltage crowbar stops output power supply signal to power management Circuit, so that electric power management circuit control ac-dc converter circuit is stopped.
In one embodiment, ac-dc converter circuit includes input rectifying filter module, PWM control modules, transformer Module and output filter module, transformer module include armature winding, secondary windings and auxiliary winding.
For the input terminal of input rectifying filter module for accessing alternating current, the output end connection of input rectifying filter module is primary The first end of winding, the sampled signal input of the sampling end connection overvoltage crowbar of input rectifying filter module.
The power supply signal output end of the power end connection overvoltage crowbar of electric power management circuit, electric power management circuit Pwm signal output end connects the input terminal of PWM control modules, and the output end of PWM control modules connects the second of armature winding End,.
The first end of the AC signal input terminal connection auxiliary winding of overvoltage crowbar.
The first end of the input terminal connection secondary windings of output filter module, secondary windings second end and auxiliary winding second End is respectively used to be grounded.
In one embodiment, electric power management circuit includes pulse width modulation chip.
Existing advantageous effect is the utility model embodiment compared with prior art:Pass through the restriction pair of over-pressed detection module Sampled signal carries out the predetermined threshold value of overvoltage protection, and when overvoltage occurs, over-pressed detection module detects that sampled signal is more than Predetermined threshold value, control switch module are switched to off-state, and to make output module stop output power supply signal, entire overvoltage is protected Protection circuit non-output signal, to stop powering to late-class circuit, late-class circuit is stopped, and realizes and is protected to the overvoltage of circuit Shield, prevents too high voltages from being damaged to circuit components.
Description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model, For those of ordinary skill in the art, without having to pay creative labor, it can also obtain according to these attached drawings Obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the overvoltage crowbar that one embodiment of the utility model provides;
Fig. 2 is the structural schematic diagram for the overvoltage crowbar that one embodiment of the utility model provides;
Fig. 3 is the electrical block diagram for the overvoltage crowbar that one embodiment of the utility model provides;
Fig. 4 is the structural schematic diagram for the Switching Power Supply that one embodiment of the utility model provides;
Fig. 5 is the structural schematic diagram for the Switching Power Supply that one embodiment of the utility model provides.
Specific implementation mode
In order to make those skilled in the art more fully understand this programme, below in conjunction with attached in this programme embodiment Figure, is explicitly described the technical solution in this programme embodiment, it is clear that described embodiment is this programme part Embodiment, instead of all the embodiments.Based on the embodiment in this programme, those of ordinary skill in the art are not making The every other embodiment obtained under the premise of creative work should all belong to the range of this programme protection.
Term " comprising " in the specification and claims of this programme and above-mentioned attached drawing and other any deformations are Refer to " including but not limited to ", it is intended that cover and non-exclusive include.In addition, term " first " and " second " etc. are for distinguishing Different objects, not for description particular order.
The realization of the utility model is described in detail below in conjunction with specific attached drawing:
Embodiment 1:
Fig. 1 shows a kind of structure for overvoltage crowbar 100 that one embodiment of the utility model is provided, for the ease of Illustrate, illustrate only with the relevant part of the utility model embodiment, details are as follows:
As shown in Figure 1, a kind of overvoltage crowbar 100 that the utility model embodiment is provided, including overvoltage detection mould Block 110, switch module 120, input module 130 and output module 140.
The output end of the controlled end of the output end connecting valve module 120 of over-pressed detection module 110, input module 130 connects Connect the input terminal of switch module 120, the input terminal of the output end connection output module 140 of switch module 120.
The input terminal of over-pressed detection module 110 receive outside sampled signal Sample, over-pressed detection module 110 is according to adopting Sample signal Sample control switch modules 120 switch between conducting state and off-state.
When the voltage of sampled signal Sample is less than or equal to predetermined threshold value, over-pressed detection module 110 controls switching molding Block 120 is in the conduction state, is connected between the input terminal and output end of switch module 120.When the voltage of sampled signal Sample When more than predetermined threshold value, over-pressed detection module 110 controls switch module 120 and is off, the input terminal of switch module 120 It is separated with output end.
AC signal AC outside the input terminal reception of input module 130, input module 130 carry out rectification to AC signal Direct current signal is exported after being filtered to the input terminal of switch module 120.
When switch module 120 is in the conduction state, the output end of switch module 120 exports direct current signal to output module 140, output module 140 carries out output power supply signal VCC after current limliting is filtered to direct current signal.
When switch module 120 is off, output module 140 stops output power supply signal VCC.
In a particular application, overvoltage crowbar 100 is for being separately connected electric power management circuit 200 and AC-DC conversion electricity Road 300, overvoltage crowbar 100 are connect with electric power management circuit 200 and ac-dc converter circuit 300 respectively, power management electricity Road 200 is connect with ac-dc converter circuit 300.
Ac-dc converter circuit 300 is power supply for electrical equipment for accessing alternating current to be converted to direct current.
Electric power management circuit 200 is used to control the working condition of ac-dc converter circuit 300, specifically includes control alternating current-direct current 300 continue working of conversion circuit is stopped, and controls the voltage for the direct current that ac-dc converter circuit 300 exports.
Overvoltage crowbar 100 collects the sampled signal for following city's Electrical change from ac-dc converter circuit 300 Sample and AC signal AC, overvoltage crowbar 100 export power supply signal VCC to electric power management circuit according to AC signal AC 200, give electric power management circuit 200 to power.Overvoltage crowbar 100 is monitored sampled signal Sample, when generation city When electric overvoltage, the voltage of sampled signal Sample is more than predetermined threshold value, and overvoltage crowbar 100 stops to electric power management circuit 200 power supplies, electric power management circuit 200 are stopped so that ac-dc converter circuit 300 also stops output.Wait for that line voltage is steady After fixed, the voltage of sampled signal Sample is down to predetermined threshold value hereinafter, overvoltage crowbar 100 is again to electric power management circuit 200 power supplies, electric power management circuit 200 and ac-dc converter circuit 300 start to work normally.
In the utility model embodiment, is limited by over-pressed detection module 110 and over-pressed guarantor is carried out to sampled signal Sample The predetermined threshold value of shield, when overvoltage occurs, over-pressed detection module 110 detects that sampled signal Sample is more than predetermined threshold value, Control switch module 120 is switched to off-state, and to make output module 140 stop output power supply signal VCC, entire overvoltage is protected 100 non-output signal of protection circuit, to stop powering to late-class circuit, late-class circuit is stopped, and realizes the mistake to circuit Pressure protection, prevents too high voltages from being damaged to circuit components.
Embodiment 2:
Embodiment 2 is the further refinement of 100 structure of overvoltage crowbar provided embodiment 1.
As shown in Fig. 2, in one embodiment of the utility model, the over-pressed detection module 110 in Fig. 1 includes that partial pressure is single Member 111 and comparing unit 112.
The input terminal of partial pressure unit 111 is the input terminal of over-pressed detection module 110, the output end connection of partial pressure unit 111 The input terminal of comparing unit 112, the output end of comparing unit 112 are the output end of over-pressed detection module 110.
Partial pressure unit 111 accesses sampled signal Sample and carries out after voltage division processing output buck sampled signal to comparing unit 112, comparing unit 112 controls switch module 120 and is off or is connected according to the voltage swing of decompression sampled signal State.
In the present embodiment, by partial pressure unit 111 to sampled signal Sample carry out partial pressure decompression processing after export again to Comparing unit 112, comparing unit 112 control the working condition of switch module 120.
As shown in Fig. 2, in one embodiment of the utility model, the switch module 120 in Fig. 1 includes drop stream unit 121 and switch pipe unit 122.
The first end and the hot end of switch pipe unit 122 of drop stream unit 121 connect the input to form switch module 120 altogether End, the second end and the controlled end of switch pipe unit 122 of drop stream unit 121 connect the controlled end to form switch module 120, switch altogether The cold end of pipe unit 122 is the output end of switch module 120.
In the present embodiment, the controlled end of switch pipe unit 122 switchs pipe unit 122 for accessing decompression sampled signal Hot end switchs pipe unit for accessing direct current signal, the cold end of switch pipe unit 122 for exporting direct current signal 122 disconnect or are connected the connection between its hot end and cold end according to decompression sampled signal.
As shown in Fig. 2, in one embodiment of the utility model, in Fig. 1 input module 130 include current limiting unit 131, Rectification unit 132 and filter unit 133.
The input terminal of current limiting unit 131 is the input terminal of input module 130, and the output end of current limiting unit 131 connects rectification The input terminal of unit 132, the output end of rectification unit 132 connect to form input module 130 altogether with the input terminal of filter unit 133 Output end, the output end ground connection of filter unit 133.
In the present embodiment, the input terminal incoming transport signal AC of current limiting unit 131 is single by rectification unit 132 and filtering Direct current signal is exported to switch module 120 after 133 processing of member.
Embodiment 3:
Embodiment 3 is the further refinement of 100 structure of overvoltage crowbar provided embodiment 2.
As shown in figure 3, in one embodiment of the utility model, the partial pressure unit 111 in Fig. 2 includes first resistor R1, second resistance R2,3rd resistor R3 and the first capacitance C1.
The first end of first resistor R1 is the input terminal of partial pressure unit 111, the second termination second resistance of first resistor R1 The first end of the first end of R2, the second end of second resistance R2 and the first end of 3rd resistor R3 and the first capacitance C1 connects to be formed altogether The second end of the output end of partial pressure unit 111, the second end of 3rd resistor R3 and the first capacitance C1 are connected to ground altogether.
In the present embodiment, first resistor R1, second resistance R2,3rd resistor R3 and the first capacitance C1 compositions partial pressure unit 111 couples of sampled signal Sample carry out voltage division processing, output buck sampled signal.
As shown in figure 3, in one embodiment of the utility model, the comparing unit 112 in Fig. 2 includes adjustable accurate Shunt regulator U2 and the second capacitance C2.
The first end of the reference pole R of adjustable accurate shunt regulator U2 and the second capacitance C2 connect to form comparing unit altogether The second end of 112 input terminal, the cathode K of adjustable accurate shunt regulator U2 and the second capacitance C2 connect to form comparing unit altogether 112 output end, the anode A ground connection of adjustable accurate shunt regulator U2.
In the present embodiment, the reference pole R access decompression sampled signals of adjustable accurate shunt regulator U2.When decompression samples When signal is more than limit value, the cathode K of adjustable accurate shunt regulator U2 is connected with anode A.When decompression sampled signal is less than Or when equal to limit value, cathode K and the anode A of adjustable accurate shunt regulator U2 disconnect.Limit value by adjustable accurate simultaneously The device performance for joining voltage-stablizer U2 limits.
In one embodiment, the model TL431 of adjustable accurate shunt regulator U2.
The inside of TL431 is made of a reference source of 2.5V, operational amplifier and triode, its working principle is that:Only when Electric current is just had when input TL431 is higher than 2.5V with reference to the signal voltage of pole, in triode to pass through, i.e., its cathode is led with anode It is logical, when inputting signal voltages of the TL431 with reference to pole and being less than or equal to 2.5V, triode be in cut-off state and its cathode with Anode disconnects.
As shown in figure 3, in one embodiment of the utility model, the switch pipe unit 122 in Fig. 2 includes the one or three pole Pipe Q1.
The base stage of first triode Q1 is to switch the controlled end of pipe unit 122, and the current collection of the first triode Q1 extremely switchs The hot end of pipe unit 122, the cold end of the transmitting extremely switching tube unit 122 of the first triode Q1.
As shown in figure 3, in one embodiment of the utility model, the drop stream unit 121 in Fig. 2 includes the 4th resistance R4。
As shown in figure 3, in one embodiment of the utility model, the current limiting unit 131 in Fig. 2 includes the 5th resistance R5。
As shown in figure 3, in one embodiment of the utility model, the rectification unit 132 in Fig. 2 includes the first diode The anode of D1, the first diode D1 are the input terminal of rectification unit 132, and the cathode of the first diode D1 is rectification unit 132 Output end.
As shown in figure 3, in one embodiment of the utility model, the filter unit 133 in Fig. 2 includes third capacitance C3。
As shown in figure 3, in one embodiment of the utility model, the output module 140 in Fig. 2 includes the 6th resistance R6, the 4th capacitance C4 and the 5th capacitance C5, the first end of the 6th resistance R6 are the input terminal of output module 140, the 6th resistance R6 The first end of second end and the 4th capacitance C4 and the first end of the 5th capacitance C5 connect the output end to form output module 140 altogether, The second end of 4th capacitance C4 is connected to ground altogether with the second end of the 5th capacitance C5.
As shown in figure 3, the operation principle of this circuit is:It, can when sampled signal Sample is less than or equal to predetermined threshold value The cathode K of adjustment precision shunt regulator U2 is disconnected with anode A, and AC signal AC passes through the 5th resistance R5, the first diode D1 The base stage of the first triode Q1, the first triode Q1 conductings are given to the 4th resistance R4, output module 140 exports power supply signal VCC.When sampled signal Sample is more than predetermined threshold value, the cathode K of adjustable accurate shunt regulator U2 is connected with anode A, The base earth of first triode Q1, the first triode Q1 cut-offs, output module 140 stop output power supply signal VCC.
Embodiment 4:
Fig. 4 shows a kind of structure for Switching Power Supply 1 that the utility model embodiment 4 is provided, for convenience of description, only Show with 4 relevant part of the utility model embodiment, details are as follows:
As shown in figure 4, a kind of Switching Power Supply 1 that the utility model embodiment 4 is provided, including overvoltage as described above are protected Protection circuit 100 further includes electric power management circuit 200 and ac-dc converter circuit 300.
Overvoltage crowbar 100 is connect with electric power management circuit 200 and ac-dc converter circuit 300 respectively, power management Circuit 200 is connect with ac-dc converter circuit 300.
Ac-dc converter circuit 300 exports sampled signal Sample and AC signal AC to overvoltage crowbar 100 respectively.
When the voltage of sampled signal Sample is less than or equal to predetermined threshold value, overvoltage crowbar 100 is believed according to exchange Number AC exports power supply signal VCC to electric power management circuit 200, so that electric power management circuit 200 controls ac-dc converter circuit 300 Work.
When the voltage of sampled signal Sample is more than predetermined threshold value, overvoltage crowbar 100 stops output power supply signal VCC is to electric power management circuit 200, so that electric power management circuit 200 controls ac-dc converter circuit 300 and is stopped.
In the present embodiment, 200 output pulse width modulated signal PWM of electric power management circuit to ac-dc converter circuit 300, To control the working condition of ac-dc converter circuit 300.
In the present embodiment, ac-dc converter circuit 300 is power supply for electrical equipment for accessing alternating current to be converted to direct current.Electricity Power management circuits 200 are used to control ac-dc converter circuit 300 according to the power supply signal VCC that overvoltage crowbar 100 exports Working condition
As shown in figure 5, in one embodiment of the utility model, ac-dc converter circuit 300 is filtered including input rectifying Wave module 310, PWM control modules 320, transformer module 330 and output filter module 340, transformer module 330 include primary Winding, secondary windings and auxiliary winding.
The input terminal of input rectifying filter module 310 connects for accessing alternating current, the output end of input rectifying filter module 310 Connect the first end of armature winding, the sampled signal of the sampling end connection overvoltage crowbar 100 of input rectifying filter module 310 Sample input terminals.
The power supply signal VCC output ends of the power end connection overvoltage crowbar 100 of electric power management circuit 200, power supply pipe Manage the input terminal of the pwm signal output end connection PWM control modules 320 of circuit 200, the output end connection of PWM control modules 320 The second end of armature winding,.
The first end of the AC signal input terminal connection auxiliary winding of overvoltage crowbar 100.
The first end of the input terminal connection secondary windings of output filter module 340, secondary windings second end and auxiliary winding Second end is respectively used to be grounded.
In one embodiment of the utility model, electric power management circuit 200 includes that pulse width modulates chip.
The operation principle of the utility model embodiment is:When line voltage is stablized in setting range, input rectifying filter The sampled signal Sample that wave module 310 exports is less than or equal to predetermined threshold value, and AC signal AC was transmitted to by auxiliary winding Power supply signal VCC is transmitted to electric power management circuit 200 and is powered by voltage protection circuit 100, overvoltage crowbar 100, is handed over straight It flows conversion circuit 300 to work normally, entire Switching Power Supply 1 works normally.When line voltage is more than in setting range, input is whole It flows the sampled signal Sample that filter module 310 exports and is more than predetermined threshold value, overvoltage crowbar 100 stops to power management electricity Road 200 is powered, and ac-dc converter circuit 300 is stopped, and entire Switching Power Supply 1 is stopped.Wait for that line voltage is stablized When in setting range, Switching Power Supply 1 restarts work.
It should be noted that the identical port of label or pin are to be connected in the utility model the description and the appended drawings.
The above, above example are only to illustrate the technical solution of the utility model, rather than its limitations;Although ginseng The utility model is described in detail according to previous embodiment, it will be understood by those of ordinary skill in the art that:It is still Can be with technical scheme described in the above embodiments is modified, or which part technical characteristic is equally replaced It changes;And these modifications or replacements, various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution Spirit and scope.

Claims (10)

1. a kind of overvoltage crowbar, which is characterized in that including over-pressed detection module, switch module, input module and output mould Block;
The output end of the overvoltage detection module connects the controlled end of the switch module, the output end connection of the input module The input terminal of the switch module, the output end of the switch module connect the input terminal of the output module;
Sampled signal outside the input terminal reception of the overvoltage detection module, the overvoltage detection module are believed according to the sampling Number control switch module switches between conducting state and off-state;
When the voltage of the sampled signal is less than or equal to predetermined threshold value, the overvoltage detection module controls the switch module It is in the conduction state, it is connected between the input terminal and output end of the switch module;When the voltage of the sampled signal is more than in advance If when threshold value, the overvoltage detection module controls the switch module and is off, the input terminal of the switch module and Output end it is separated;
AC signal outside the input terminal reception of the input module, the input module carry out rectification to the AC signal Direct current signal is exported after being filtered to the input terminal of the switch module;
When the switch module is in the conduction state, the output end of the switch module exports the direct current signal to described defeated Go out module, the output module carries out the direct current signal to export power supply signal after current limliting is filtered;
When the switch module is off, the output module stops exporting the power supply signal.
2. overvoltage crowbar as described in claim 1, which is characterized in that it is described overvoltage detection module include partial pressure unit and Comparing unit;
The input terminal of the partial pressure unit is the input terminal of the over-pressed detection module, and the output end of the partial pressure unit connects institute The input terminal of comparing unit is stated, the output end of the comparing unit is the output end of the over-pressed detection module;
The partial pressure unit accesses the sampled signal and carries out after voltage division processing output buck sampled signal to the comparing unit, The comparing unit controls the switch module and is off or leads according to the voltage swing of the decompression sampled signal Logical state.
3. overvoltage crowbar as claimed in claim 2, which is characterized in that the partial pressure unit includes first resistor, second Resistance, 3rd resistor and the first capacitance;
The first end of the first resistor is the input terminal of the partial pressure unit, the second termination described second of the first resistor The first end of resistance, the first end of the second end of the second resistance and the first end and first capacitance of the 3rd resistor Connect the output end to form the partial pressure unit altogether, the second end of the second end of the 3rd resistor and first capacitance is connected to altogether Ground.
4. overvoltage crowbar as claimed in claim 2, which is characterized in that the comparing unit includes adjustable accurate parallel connection Voltage-stablizer and the second capacitance;
The reference pole of the adjustable accurate shunt regulator and the first end of second capacitance connect altogether to be formed it is described compared with it is single The input terminal of member, the cathode of the adjustable accurate shunt regulator and the second end of second capacitance connect to form the ratio altogether Compared with the output end of unit, the plus earth of the adjustable accurate shunt regulator.
5. overvoltage crowbar as described in claim 1, which is characterized in that the switch module includes drop stream unit and switch Pipe unit;
The first end of the drop stream unit and the hot end of the switch pipe unit connect the input to form the switch module altogether End, the second end of the drop stream unit and the controlled end of the switch pipe unit connect the controlled end to form the switch module altogether, The cold end of the switch pipe unit is the output end of the switch module.
6. overvoltage crowbar as claimed in claim 5, which is characterized in that the switch pipe unit includes the first triode;
The base stage of first triode is the controlled end of the switch pipe unit, and the current collection of first triode is extremely described Switch the hot end of pipe unit, the cold end of the extremely described switch pipe unit of transmitting of first triode.
7. overvoltage crowbar as described in claim 1, which is characterized in that the input module includes current limiting unit, rectification Unit and filter unit;
The input terminal of the current limiting unit is the input terminal of the input module, and the output end connection of the current limiting unit is described whole The input terminal of unit is flowed, the output end of the rectification unit and the input terminal of the filter unit connect to form the input module altogether Output end, the filter unit output end ground connection.
8. a kind of Switching Power Supply, which is characterized in that including overvoltage crowbar as described in any one of claim 1 to 7, also wrap Include electric power management circuit and ac-dc converter circuit;
The overvoltage crowbar is connect with the electric power management circuit and the ac-dc converter circuit respectively, the power supply pipe Reason circuit is connect with the ac-dc converter circuit;
The ac-dc converter circuit exports the sampled signal and the AC signal to the overvoltage crowbar respectively;
When the voltage of the sampled signal is less than or equal to predetermined threshold value, the overvoltage crowbar is according to the AC signal The power supply signal is exported to the electric power management circuit, so that the electric power management circuit controls the ac-dc converter circuit Work;
When the voltage of the sampled signal is more than predetermined threshold value, the overvoltage crowbar stops exporting the power supply signal extremely The electric power management circuit, so that the electric power management circuit controls the ac-dc converter circuit and is stopped.
9. Switching Power Supply as claimed in claim 8, which is characterized in that the ac-dc converter circuit includes input rectifying filtering Module, PWM control modules, transformer module and output filter module, the transformer module include armature winding, secondary windings And auxiliary winding;
The input terminal of the input rectifying filter module is for accessing alternating current, the output end connection of the input rectifying filter module The sampling end of the first end of the armature winding, the input rectifying filter module connects the sampling letter of the overvoltage crowbar Number input terminal;
The power end of the electric power management circuit connects the power supply signal output end of the overvoltage crowbar, the power management The pwm signal output end of circuit connects the input terminal of the PWM control modules, and the output end of the PWM control modules connects institute State the second end of armature winding;
The AC signal input terminal of the overvoltage crowbar connects the first end of the auxiliary winding;
The input terminal of the output filter module connects the first end of the secondary windings, the secondary windings second end and described Auxiliary winding second end is respectively used to be grounded.
10. Switching Power Supply as claimed in claim 8, which is characterized in that the electric power management circuit includes pulse width modulation Chip.
CN201721577057.3U 2017-11-22 2017-11-22 A kind of overvoltage crowbar and Switching Power Supply Active CN207677431U (en)

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