CN110289597A - A kind of power module and its protection circuit - Google Patents
A kind of power module and its protection circuit Download PDFInfo
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- CN110289597A CN110289597A CN201910675205.2A CN201910675205A CN110289597A CN 110289597 A CN110289597 A CN 110289597A CN 201910675205 A CN201910675205 A CN 201910675205A CN 110289597 A CN110289597 A CN 110289597A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- Emergency Protection Circuit Devices (AREA)
Abstract
This disclosure relates to a kind of power module and its protection circuit; circuit is protected including delay startup circuit, input over under-voltage protection circuit, output overvoltage protection circuit, output overcurrent; wherein; delay startup circuit powers on after one section of delay time in power module; power module is just opened, to reduce the rush of current of bus when power module is opened.When the input voltage of power module is less than first voltage threshold value or is greater than second voltage threshold value, input over under-voltage protection circuit can control solid-state relay disconnection, power cutoff module.When the output voltage for detecting power module is greater than tertiary voltage threshold value, control solid-state relay disconnects output overvoltage protection circuit, and power cutoff module, the output voltage to avoid power module is excessive and damages.Output overcurrent protects circuit to be used for when the output voltage of power module is excessive, and control solid-state relay disconnects, and then power cutoff module, excessive to avoid operating current and damage power module.
Description
Technical field
This disclosure relates to power technique fields, and in particular, to a kind of power module and its protection circuit.
Background technique
Power module is a kind of voltage transformation module, for converting input voltage into another voltage output, at present extensively
It applies in the communications fields such as switching equipment, access device, mobile communication, microwave communication and optical transport, router and automobile electricity
Son, aerospace etc..In general, in the power module course of work, the parameter of power module (such as input voltage, output voltage, defeated
Electric current etc. out) not in normal range of operation when, it is possible to power module can be damaged, therefore, if to power module be arranged protect
Circuit, when the parameter of power module) not in normal range of operation when, timely power cutoff module being capable of protection power source module
In order to avoid therefore damage is arranged suitable power module protection circuit and works power module with important meaning with security and stability
Justice.
Summary of the invention
Purpose of this disclosure is to provide a kind of power module and its protection circuits.
To achieve the goals above, a kind of protection circuit of power module is provided according to the one side of the embodiment of the present disclosure,
Include: the first filter circuit, the auxiliary power module being connect with first filter circuit, and respectively with the accessory power supply
The delay startup circuit of the output end connection of module, input over under-voltage protection circuit, output overvoltage protection circuit, output overcurrent are protected
Protection circuit, the delay startup circuit, the input over under-voltage protection circuit, the output overvoltage protection circuit and described defeated
Current foldback circuit is connect with solid-state relay out, and the solid-state relay is connected in series on the output plus terminal of power module；
Wherein, the delay startup circuit is less than preset delayed startup for the duration when the power module powers on
When the time, controls the solid-state relay and disconnect, so that the power module does not start, and, the delay startup circuit is also
When being greater than the start-up time delay for the duration when the power module powers on, the solid-state relay conducting is controlled,
The power module starting；
The input over under-voltage protection circuit is connect with the input terminal of the power module, for obtaining the power module
Input voltage, and the input voltage of the power module be less than first voltage threshold value or be greater than second voltage threshold value when,
It controls the solid-state relay to disconnect, to turn off the power module, wherein the second voltage threshold value is greater than first electricity
Press threshold value；
The output overvoltage protection circuit is connect with the output end of the power module, for obtaining the power module
Output voltage, and when the output voltage of the power module is greater than tertiary voltage threshold value, it controls the solid-state relay and disconnects,
To turn off the power module；
The output overcurrent protection circuit is connect with the current sampling port of the power module outlet, described for obtaining
The output electric current of power module, and when the output electric current of the power module is greater than current threshold, control the solid-state relay
Device disconnects, to turn off the power module.
Optionally, the delay startup circuit includes voltage-stablizer, the timer connecting with the voltage-stablizer and the first light
Electric coupler U1, the input terminal of the delay startup circuit are connect with the output end of the auxiliary power module, the voltage-stablizer
It is connected to the input terminal of the delay startup circuit, for being converted to the output voltage of the auxiliary power module described in satisfaction
The input voltage of timer input；
The output end of the timer is connect with the anode of the first photoelectrical coupler U1, first photoelectrical coupler
The cathode of U1 connects the accessory power supply mould by series connection first resistor R1 ground connection, the collector of the first photoelectrical coupler U1
The emitter of the output plus terminal of block, the first photoelectrical coupler U1 connects the input anode of the solid-state relay, described solid
The input anode of state relay is connect by the way that second resistance R2 is connected in series with the base stage of triode Q1, the base of the triode Q1
3rd resistor R3, the emitter ground connection of the triode Q1, the collection of the triode Q1 are connected in parallel between pole and its emitter
Electrode connects the input negative terminal of the solid-state relay.
Optionally, the input over under-voltage protection circuit includes input voltage comparison circuit, the second photoelectrical coupler U2,
The anode of three photoelectrical coupler U3 and the 4th photoelectrical coupler U4, the second photoelectrical coupler U2 pass through the 4th resistance R4 of series connection
The output plus terminal of the auxiliary power module is connected, the collector of the second photoelectrical coupler U2 is by being connected in series the 5th electricity
Resistance R5 is connect with the output plus terminal of the auxiliary power module, the anode and second photoelectricity of the third photoelectrical coupler U3
The collector of coupler U2 connects, the collector of the third photoelectrical coupler U3 and the output plus terminal of the auxiliary power module
The emitter of connection, the third photoelectrical coupler U3 is connected by the anode of series connection the 6th resistance R6 and the first light emitting diode D1
It connects, the cathode ground connection of the first light emitting diode D1；
The cathode of the third photoelectrical coupler U3 is connect with the anode of the 4th photoelectrical coupler U4, second light
The emitter of electric coupler U2 is connect with the cathode of the 4th photoelectrical coupler U4, the current collection of the 4th photoelectrical coupler U4
Pole and its emitter are connect with the base stage of the triode Q1 and its emitter respectively；
The input anode and the second photoelectrical coupler U2 of the input voltage comparison circuit and the power module
Cathode connection, the input voltage comparison circuit are used to be less than the first voltage in the input voltage for determining the power module
Threshold value or when being greater than the second voltage threshold value, disconnects the second photoelectrical coupler U2, the third photoelectrical coupler
U3 and the 4th photoelectrical coupler U4 conducting, wherein when the 4th photoelectrical coupler U4 is connected, the solid-state relay is disconnected
It opens；When the third photoelectrical coupler U3 is connected, the first light emitting diode D1 shines.
Optionally, the input voltage comparison circuit includes the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth
Resistance R10 and eleventh resistor R11, the first reference voltage source D2 and the second reference voltage source D3, wherein the 7th resistance
R7, the 8th resistance R8 and the 9th resistance R9 are connected in series, and the 7th resistance R7 connects the power module
Input anode, the 9th resistance R9 ground connection, the connecting pin and described first of the 8th resistance R8 and the 9th resistance R9
The datum mark of reference voltage source D2 connects, the yin of the cathode of the first reference voltage source D2 and the second photoelectrical coupler U2
Pole connection, the plus earth of the first reference voltage source D2；
The tenth resistance R10 and eleventh resistor R11 is connected in series, the tenth resistance R10 and the power supply
The input anode connection of module, the eleventh resistor R11 ground connection, the tenth resistance R10 and the eleventh resistor R11's
Connecting pin is connect with the datum mark of the second reference voltage source D3, the cathode and the described 7th of the second reference voltage source D3
Resistance R7 is connected with the connecting pin of the 8th resistance R8, the plus earth of the second reference voltage source D3.
Optionally, the output overcurrent protection circuit includes current comparison circuit, the 5th photoelectrical coupler U5, the 6th photoelectricity
Coupler U6 and silicon-controlled D4, the current sampling port of the current comparison circuit and the power module outlet and it is described can
Control the control electrode connection of silicon D4, the minus earth of the silicon-controlled D4, the anode of the silicon-controlled D4 and the 5th photoelectricity coupling
The cathode of clutch U5 connects, the collector and its emitter of the 5th photoelectrical coupler U5 base with the triode Q1 respectively
Pole and its emitter connection；
The anode of the 5th photoelectrical coupler U5 is connect with the cathode of the 6th photoelectrical coupler U6, the 6th light
The anode and its collector of electric coupler U6 passes through twelfth resistor R12 and thirteenth resistor R13 and the accessory power supply respectively
The output plus terminal of module connects, and the emitter of the 6th photoelectrical coupler U6 is connect with the anode of the second light emitting diode D5,
The minus earth of the second light emitting diode D5；
The current comparison circuit is used for when the current value of the power module outlet is greater than the current threshold, institute
State the current comparison circuit output control signal control silicon-controlled D4 conducting, when the silicon-controlled D4 is connected, the 5th light
Electric coupler U5 and the 6th photoelectrical coupler U6 conducting；Wherein, when the 5th photoelectrical coupler U5 is connected, the solid-state
Relay disconnects, and when the 6th photoelectrical coupler U6 is connected, the second light emitting diode D5 shines.
Optionally, the current comparison circuit includes voltage regulator circuit and comparator, and the voltage regulator circuit includes third benchmark
The cathode of voltage source D6 and capacitor C1, the third reference voltage source D6 pass through the 14th resistance R14 of series connection and auxiliary electricity
The output plus terminal of source module connects, and connects between the cathode and its datum mark of the third reference voltage source D6, the third base
Capacitor C1, the plus earth of the third reference voltage source D6 are connected in parallel between the datum mark and its anode of reference voltage source D6；
The input negative terminal of the comparator is connect with the 15th resistance R15 and the 16th resistance R16, the 15th resistance
R15 and the 16th resistance R16 is connected in series, the cathode of the 15th resistance R15 and the third reference voltage source D6
The input anode of connection, the 16th resistance R16 ground connection, the comparator passes through described in the 17th resistance R17 connection of series connection
The current sampling port of power module output, the output end of the comparator by the 18th resistance R18 of series connection with it is described silicon-controlled
The control electrode of D4 connects；When the current value of the power module outlet is greater than the current threshold, the same phase of the comparator
The voltage of input terminal is greater than the voltage of its reverse input end, and the comparator exports the control signal.
Optionally, the output overvoltage protection circuit includes output voltage comparison circuit and the 7th photoelectrical coupler U7, institute
Output voltage comparison circuit is stated to connect with the cathode of the output plus terminal of the power module and the 7th photoelectrical coupler U7,
The anode of the 7th photoelectrical coupler U7 is connected by the output plus terminal of the 19th resistance R19 of series connection and the auxiliary power module
It connects, the collector of the 7th photoelectrical coupler U7 protects circuit by the 20th resistance R20 of series connection and the output overcurrent
Anode connection is inputted, the emitter of the 7th photoelectrical coupler U7 is connect with the control electrode of the silicon-controlled D4；
The output voltage comparison circuit is used to be greater than the tertiary voltage threshold value in the output voltage of the power module
When, the 7th photoelectrical coupler U7 is connected, when the 7th photoelectrical coupler U7 is connected, the silicon-controlled D4 and described the
Five photoelectrical coupler U5 conducting, the solid-state relay shutdown.
Optionally, the output voltage comparison circuit includes the 4th reference voltage source D7, the 21st resistance R21 and second
12 resistance R22, the 21st resistance R21 and the 22nd resistance R22 are connected in series, the 21st resistance
R21 is connect with the output plus terminal of the power module, the 22nd resistance R22 ground connection, the 21st resistance R21 and
The connecting pin of the 22nd resistance R22 is connect with the datum mark of the 4th reference voltage source D7, the 4th benchmark electricity
The cathode of potential source D7 is connect with the cathode of the 7th photoelectrical coupler U7, the plus earth of the 4th reference voltage source D7.
Another aspect according to the present disclosure provides a kind of power module, the guarantor including power module described above
Protection circuit.
Through the above technical solutions, the protection circuit of the power module includes delay startup circuit, input overvoltage/undervoltage protection
Circuit, output overvoltage protection circuit, output overcurrent protect circuit, wherein delay startup circuit is powered in power module by one
After section delay time, power module is just opened, to reduce the rush of current of bus when power module is opened.When power module
Input voltage be less than first voltage threshold value or be greater than second voltage threshold value when, input over under-voltage protection circuit can control solid-state after
Electric appliance disconnects, power cutoff module, to guarantee the input voltage of power module in normal working range.Output over-voltage protection
When the output voltage for detecting power module is greater than tertiary voltage threshold value, control solid-state relay disconnects circuit, power cutoff
Module, the output voltage to avoid power module is excessive and damages.Output overcurrent protects circuit to be used for the output in power module
When electric current is excessive, control solid-state relay is disconnected, and then power cutoff module, to avoid power module due to operating current is excessive
Damage.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is a kind of structure chart of the protection circuit of power module shown according to an exemplary embodiment；
Fig. 2 is a kind of circuit diagram of delay startup circuit shown according to an exemplary embodiment；
Fig. 3 is a kind of circuit diagram for inputting over under-voltage protection circuit shown according to an exemplary embodiment；
Fig. 4 is a kind of circuit diagram of output overcurrent protection circuit shown according to an exemplary embodiment；
Fig. 5 is a kind of circuit diagram of output overvoltage protection circuit shown according to an exemplary embodiment.
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
Content of this disclosure is described in detail below according to specific embodiment.
Fig. 1 is a kind of structure chart of the protection circuit of power module shown according to an exemplary embodiment, such as Fig. 1 institute
Show, which includes: the first filter circuit 1, the auxiliary power module 2 connecting with first filter circuit 1, and difference
The delay startup circuit 3 that is connect with the output end of the auxiliary power module 2, input over under-voltage protection circuit 4, output over-voltage protection
Circuit 5, output overcurrent protect circuit 6, the delay startup circuit 3, the input over under-voltage protection circuit 4, the output over-voltage protection
Circuit 5 and output overcurrent protection circuit 6 are connect with solid-state relay 7, which is connected in series in power module
On 8 output plus terminal；
Wherein, when which is less than preset delayed startup for the duration when the power module 8 powers on
Between when, control the solid-state relay 7 disconnection so that the power module 8 does not start, and, which is also used to
When duration when the power module 8 powers on is greater than the start-up time delay, the solid-state relay 7 conducting, the power module 8 are controlled
Starting；
The input over under-voltage protection circuit 5 is connect with the input terminal of the power module 8, for obtaining the power module 8
Input voltage, and when the input voltage of the power module 8 is less than first voltage threshold value or is greater than second voltage threshold value, control
The solid-state relay 7 disconnects, to turn off the power module 8, wherein the second voltage threshold value is greater than the first voltage threshold value；
The output overvoltage protection circuit 5 is connect with the output end of the power module 8, for obtaining the defeated of the power module 8
Voltage out, and when the output voltage of the power module 8 is greater than tertiary voltage threshold value, the solid-state relay 7 disconnection is controlled, to close
Break the power module 8；
Output overcurrent protection circuit 6 is connect with the current sampling port of 8 output end of power module, for obtaining the power supply
The output electric current of module 8, and when the output electric current of the power module 8 is greater than current threshold, it is disconnected to control the solid-state relay 7
It opens, to turn off the power module 8.
Wherein, first filter circuit is for the interference signal on filtering circuit, the output plus terminal of auxiliary power module with
Delay startup circuit, input over under-voltage protection circuit, output overvoltage protection circuit, output overcurrent protect circuit connection, and being used for will
Supply voltage, which is converted to, meets delay startup circuit, input over under-voltage protection circuit, output overvoltage protection circuit, output overcurrent guarantor
The voltage of protection circuit input requirements.
Wherein, delay startup circuit powers in power module and after one section of delay time, and power module is just opened,
To reduce the rush of current of bus when power module is opened.It is achieved in that as shown in Fig. 2, one kind is possible, the delayed startup
Circuit includes voltage-stablizer, the timer connecting with the voltage-stablizer and the first photoelectrical coupler U1, the delay startup circuit it is defeated
Enter end to connect with the output end of the auxiliary power module, which is connected to the input terminal of the delay startup circuit, and being used for will
The output voltage of the auxiliary power module is converted to the input voltage for meeting timer input；The output end of the timer with should
The anode of first photoelectrical coupler U1 connects, and the cathode of first photoelectrical coupler U1, should by series connection first resistor R1 ground connection
The collector of first photoelectrical coupler U1 connects the output plus terminal of the auxiliary power module, the transmitting of first photoelectrical coupler U1
Pole connects the input anode of the solid-state relay, and the input anode of the solid-state relay is by being connected in series second resistance R2 and three
The base stage of pole pipe Q1 connects, and is connected in parallel 3rd resistor R3 between the base stage and its emitter of triode Q1, triode Q1
Emitter ground connection, the collector of triode Q1 connects the input negative terminal of the solid-state relay.
When the duration that power module powers on is less than preset start-up time delay, timer is not turned on, then the first thermocouple
Clutch U1 is also not turned on, and triode Q1 is in by state, therefore solid-state relay disconnects, so power module cannot start；
When the duration that power module powers on is greater than the start-up time delay, timer conducting, then the first electric coupler U1 can be led
Logical, triode Q1 is in the conductive state, so solid-state relay is connected, power module can start.
In the present embodiment, which may be selected model MC78M05BDTRKG, and SA555 timer may be selected in timer, fixed
When device start-up time delay can be set according to practical application, 2s such as is arranged in start-up time delay.In the prior art, the first light
Electric coupler (including the first photoelectrical coupler hereinafter to the 7th photoelectrical coupler) is made of light emitting diode and triode,
The exit of photoelectrical coupler includes the anode and cathode of light emitting diode and the collector and emitter of triode, such as type
Number photoelectrical coupler for being PC817, those skilled in the art according to practical application in practical application, can select suitable ginseng
Several photoelectrical couplers.
When the input voltage of power module is less than first voltage threshold value or is greater than second voltage threshold value, input overvoltage/undervoltage is protected
Protection circuit can control solid-state relay disconnection, power module shutdown, to guarantee the input voltage of power module in normal work
Make in range.Illustratively, as shown in figure 3, the input over under-voltage protection circuit includes input voltage comparison circuit, the second photoelectricity coupling
Clutch U2, third photoelectrical coupler U3 and the 4th photoelectrical coupler U4, the anode of second photoelectrical coupler U2 pass through series connection the
Four resistance R4 connect the output plus terminal of the auxiliary power module, and the collector of second photoelectrical coupler U2 is by being connected in series the
Five resistance R5 are connect with the output plus terminal of the auxiliary power module, the anode of third photoelectrical coupler U3 and the second photoelectricity coupling
The collector of clutch U2 connects, and the collector of third photoelectrical coupler U3 is connect with the output plus terminal of the auxiliary power module,
The emitter of third photoelectrical coupler U3 is connect by the positive of series connection the 6th resistance R6 and the first light emitting diode D1, this
The cathode of one light emitting diode D1 is grounded；The cathode of third photoelectrical coupler U3 and the anode of the 4th photoelectrical coupler U4 connect
It connects, the emitter of second photoelectrical coupler U2 is connect with the cathode of the 4th photoelectrical coupler U4, the 4th photoelectrical coupler
The collector and its emitter of U4 is connect with the base stage of triode Q1 and its emitter respectively；The input voltage comparison circuit with
The input anode of the power module is connected with the cathode of second photoelectrical coupler U2, which is used for true
When the input voltage of the fixed power module is less than the first voltage threshold value or is greater than the second voltage threshold value, make second photoelectricity
Coupler U2 is disconnected, and the third photoelectrical coupler U3 and the 4th photoelectrical coupler U4 are connected, wherein the 4th photoelectrical coupler
When U4 is connected, which is disconnected；When the third photoelectrical coupler U3 is connected, which shines.
Determine the input voltage of power module in first voltage threshold value and second voltage threshold value in input voltage comparison circuit
Between when, input over under-voltage protection circuit do not work, power module work normally.Power module input voltage less than first
When voltage threshold (input undervoltage) or input voltage are greater than second voltage threshold value (input over-voltage), the second photoelectrical coupler U2 is disconnected
It opens, at this point, the 4th photoelectrical coupler U4 is connected, solid-state relay is disconnected, then power module turns off；Second photoelectrical coupler U2 is disconnected
When opening, third photoelectrical coupler U3 is also switched on, and the first light emitting diode D1 shines, and instruction power module is in guard mode.
Optionally, referring to Fig. 3, which includes the 7th resistance R7, the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10 and eleventh resistor R11, the first reference voltage source D2 and the second reference voltage source D3, wherein the 7th
Resistance R7, the 8th resistance R8 and the 9th resistance R9 are connected in series, and the 7th resistance R7 connects the input of the power module
Anode, the 9th resistance R9 ground connection, the connecting pin and first reference voltage source D2 of the 8th resistance R8 and the 9th resistance R9
Datum mark connection, the cathode of first reference voltage source D2 connect with the cathode of second photoelectrical coupler U2, first base
The plus earth of reference voltage source D2；Tenth resistance R10 and eleventh resistor R11 are connected in series, the tenth resistance R10 with should
The input anode of power module connects, eleventh resistor R11 ground connection, the company of the tenth resistance R10 and eleventh resistor R11
End is connect to connect with the datum mark of second reference voltage source D3, the cathode of second reference voltage source D3 and the 7th resistance R7 and
The connecting pin of 8th resistance R8 connects, the plus earth of second reference voltage source D3.
In the present embodiment, when the input voltage of power module is less than first voltage threshold value, the input electricity of power module
Pressure reduces, and the voltage between the 8th resistance R8 and the 9th resistance R9 also reduces, and the first reference voltage source D2 is in not on-state,
Therefore, the second photoelectrical coupler U2 is disconnected.At this point, third photoelectrical coupler U3 and the 4th photoelectrical coupler U4 conducting.
Correspondingly, when the input voltage of power module is greater than first voltage threshold value, the input voltage of power module increases,
Voltage between tenth resistance R10 and eleventh resistor R11 increases, accordingly, between the 8th resistance R8 and the 9th resistance R9
Voltage will correspondingly reduce, and the first reference voltage source D2 is in not on-state, and therefore, the second photoelectrical coupler U2 is disconnected.
At this point, third photoelectrical coupler U3 and the 4th photoelectrical coupler U4 conducting.
Output overcurrent protects circuit to be used for when the output electric current of power module is excessive, and control solid-state relay disconnects, with
Power cutoff module avoids power module from damaging because operating current is excessive.It is achieved in that as shown in figure 4, one kind is possible,
Output overcurrent protection circuit includes current comparison circuit, the 5th photoelectrical coupler U5, the 6th photoelectrical coupler U6 and silicon-controlled
D4, the current comparison circuit are connect with the control electrode of the current sampling port of the power module outlet and the silicon-controlled D4, should
The minus earth of silicon-controlled D4, the anode of the silicon-controlled D4 are connect with the cathode of the 5th photoelectrical coupler U5, the 5th photoelectricity
The collector and its emitter of coupler U5 is connect with the base stage of triode Q1 and its emitter respectively；5th photoelectric coupling
The anode of device U5 is connect with the cathode of the 6th photoelectrical coupler U6, the anode and its collector point of the 6th photoelectrical coupler U6
Not Tong Guo twelfth resistor R12 and thirteenth resistor R13 connect with the output plus terminal of the auxiliary power module, the 6th photoelectricity coupling
The emitter of clutch U6 is connect with the anode of the second light emitting diode D5, the minus earth of second light emitting diode D5；The electricity
It flows comparison circuit to be used for when the current value of the power module outlet is greater than the current threshold, current comparison circuit output control
Signal processed controls the silicon-controlled D4 conducting, when which is connected, the 5th photoelectrical coupler U5 and the 6th photoelectric coupling
Device U6 conducting；Wherein, when the 5th photoelectrical coupler U5 is connected, which is disconnected, and the 6th photoelectrical coupler U6 is led
When logical, which shines.
Power module output electric current be less than current threshold when, silicon-controlled D4 is not turned on, the 5th photoelectrical coupler U5 and
6th photoelectrical coupler U6 is also not turned on, and power module is in normal operating conditions.It is greater than electricity in the output electric current of power module
When flowing threshold value, current comparison circuit output control signal controls silicon-controlled D4 conducting, at this point, the 5th photoelectrical coupler U5 is connected,
Solid-state relay is turned off, then power module turns off.When silicon-controlled D4 is connected, the 6th photoelectrical coupler U6 is also switched on, and second shines
Diode D5 shines, and instruction power module is in guard mode.
Optionally, referring to Fig. 4, which includes voltage regulator circuit and comparator, which includes third
The cathode of reference voltage source D6 and capacitor C1, third reference voltage source D6 pass through the 14th resistance R14 of series connection and auxiliary electricity
The output plus terminal of source module connects, and connects between the cathode and its datum mark of third reference voltage source D6, the third benchmark electricity
It is connected in parallel capacitor C1 between the datum mark and its anode of potential source D6, the plus earth of third reference voltage source D6；This compares
The input negative terminal of device is connect with the 15th resistance R15 and the 16th resistance R16, the 15th resistance R15 and the 16th resistance
R16 is connected in series, and the 15th resistance R15 is connect with the cathode of third reference voltage source D6, and the 16th resistance R16 connects
Ground, the input anode of the comparator connect the current sampling port of power module output, the ratio by the 17th resistance R17 that connects
Output end compared with device is connect by the 18th resistance R18 of series connection with the control electrode of the silicon-controlled D4；The power module outlet
When current value is greater than the current threshold, the voltage of the non-inverting input terminal of the comparator is greater than the voltage of its reverse input end, the ratio
The control signal is exported compared with device.
Specifically, when the output electric current of power module is greater than current threshold, the voltage of comparator non-inverting input terminal is greater than
The voltage of its reverse input end, comparator output control signal, controls silicon-controlled D4 conducting.When silicon-controlled D4 is connected, the 5th light
Electric coupler U5 and the 6th photoelectrical coupler U6 are also switched on.
Output overvoltage protection circuit controls solid-state when the output voltage for detecting power module is greater than tertiary voltage threshold value
Relay disconnects, and power cutoff module, the output voltage to avoid power module is excessive and damages power module.As shown in figure 5,
One kind is possible to be achieved in that, wherein the output overvoltage protection circuit includes output voltage comparison circuit and the 7th photoelectricity coupling
The output plus terminal of clutch U7, the output voltage comparison circuit and the power module and the cathode of the 7th photoelectrical coupler U7 connect
It connects, the anode of the 7th photoelectrical coupler U7 is connected by the output plus terminal of the 19th resistance R19 of series connection and the auxiliary power module
It connects, the collector of the 7th photoelectrical coupler U7 protects the input of circuit by the 20th resistance R20 of series connection and the output overcurrent
Anode connection, the emitter of the 7th photoelectrical coupler U7 are connect with the control electrode of the silicon-controlled D4；The output voltage is more electric
Road is used to make the 7th photoelectrical coupler U7 be connected when the output voltage of the power module is greater than the tertiary voltage threshold value, should
When 7th photoelectrical coupler U7 is connected, the silicon-controlled D4 and the 5th photoelectrical coupler U5 are connected, solid-state relay shutdown.
Wherein, referring to Fig. 5, the output voltage comparison circuit include the 4th reference voltage source D7, the 21st resistance R21 and
22nd resistance R22, the 21st resistance R21 and the 22nd resistance R22 are connected in series, the 21st resistance
R21 is connect with the output plus terminal of the power module, the 22nd resistance R22 ground connection, the 21st resistance R21 and this second
The connecting pin of 12 resistance R22 is connect with the datum mark of the 4th reference voltage source D7, the cathode of the 4th reference voltage source D7
It is connect with the cathode of the 7th photoelectrical coupler U7, the plus earth of the 4th reference voltage source D7.
When the output voltage of power module is greater than tertiary voltage threshold value, the 21st resistance R21 and the 22nd resistance
Voltage between R22 increases, and the 4th reference voltage source D7 conducting, then the 7th photoelectrical coupler U7 is connected, at this point, silicon-controlled D4 is led
Logical, the 5th photoelectrical coupler U5 is connected when silicon-controlled D4 is connected, and solid-state relay shutdown, then power module turns off.
The disclosure also provides a kind of power module, the protection circuit including power module described above.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (9)
1. a kind of protection circuit of power module characterized by comprising the first filter circuit, with first filter circuit
The auxiliary power module of connection, and connect respectively with the output end of the auxiliary power module delay startup circuit, input
Over under-voltage protection circuit, output overvoltage protection circuit, output overcurrent protect circuit, and the delay startup circuit described inputted
Under-voltage protecting circuit, the output overvoltage protection circuit and output overcurrent protection circuit are connect with solid-state relay, institute
Solid-state relay is stated to be connected in series on the output plus terminal of power module；
Wherein, the delay startup circuit is less than preset start-up time delay for the duration when the power module powers on
When, it controls the solid-state relay and disconnects, so that the power module does not start, and, the delay startup circuit is also used to
When duration when the power module powers on is greater than the start-up time delay, the solid-state relay conducting is controlled, it is described
Power module starting；
The input over under-voltage protection circuit is connect with the input terminal of the power module, for obtaining the defeated of the power module
Enter voltage, and when the input voltage of the power module is less than first voltage threshold value or is greater than second voltage threshold value, control
The solid-state relay disconnects, to turn off the power module, wherein the second voltage threshold value is greater than the first voltage threshold
Value；
The output overvoltage protection circuit is connect with the output end of the power module, for obtaining the output of the power module
Voltage, and when the output voltage of the power module is greater than tertiary voltage threshold value, it controls the solid-state relay and disconnects, to close
Break the power module；
The output overcurrent protection circuit is connect with the current sampling port of the power module outlet, for obtaining the power supply
The output electric current of module, and when the output electric current of the power module is greater than current threshold, it is disconnected to control the solid-state relay
It opens, to turn off the power module.
2. the protection circuit of power module according to claim 1, which is characterized in that the delay startup circuit includes steady
Depressor, the timer being connect with the voltage-stablizer and the first photoelectrical coupler U1, the input terminal of the delay startup circuit with
The output end of the auxiliary power module connects, and the voltage-stablizer is connected to the input terminal of the delay startup circuit, and being used for will
The output voltage of the auxiliary power module is converted to the input voltage for meeting the timer input；
The output end of the timer is connect with the anode of the first photoelectrical coupler U1, the first photoelectrical coupler U1's
Cathode connects the auxiliary power module by series connection first resistor R1 ground connection, the collector of the first photoelectrical coupler U1
Output plus terminal, the emitter of the first photoelectrical coupler U1 connect the input anode of the solid-state relay, the solid-state after
The input anode of electric appliance by be connected in series second resistance R2 connect with the base stage of triode Q1, the base stage of the triode Q1 and
3rd resistor R3, the emitter ground connection of the triode Q1, the collector of the triode Q1 are connected in parallel between its emitter
Connect the input negative terminal of the solid-state relay.
3. the protection circuit of power module according to claim 2, which is characterized in that the input over under-voltage protection circuit
It is described including input voltage comparison circuit, the second photoelectrical coupler U2, third photoelectrical coupler U3 and the 4th photoelectrical coupler U4
The anode of second photoelectrical coupler U2 connects the output plus terminal of the auxiliary power module by the 4th resistance R4 that connects, and described the
The collector of two photoelectrical coupler U2 is connect by the way that the 5th resistance R5 is connected in series with the output plus terminal of the auxiliary power module,
The anode of the third photoelectrical coupler U3 is connect with the collector of the second photoelectrical coupler U2, the third photoelectric coupling
The collector of device U3 is connect with the output plus terminal of the auxiliary power module, and the emitter of the third photoelectrical coupler U3 passes through
The 6th resistance R6 that connects is connect with the anode of the first light emitting diode D1, the cathode ground connection of the first light emitting diode D1；
The cathode of the third photoelectrical coupler U3 is connect with the anode of the 4th photoelectrical coupler U4, the second photoelectricity coupling
The emitter of clutch U2 is connect with the cathode of the 4th photoelectrical coupler U4, the collector of the 4th photoelectrical coupler U4 and
Its emitter is connect with the base stage of the triode Q1 and its emitter respectively；
The cathode of the input anode and the second photoelectrical coupler U2 of the input voltage comparison circuit and the power module
Connection, the input voltage comparison circuit are used to be less than the first voltage threshold value in the input voltage for determining the power module
Or when being greater than the second voltage threshold value, disconnect the second photoelectrical coupler U2, the third photoelectrical coupler U3 and
The 4th photoelectrical coupler U4 conducting, wherein when the 4th photoelectrical coupler U4 is connected, the solid-state relay is disconnected；
When the third photoelectrical coupler U3 is connected, the first light emitting diode D1 shines.
4. the protection circuit of power module according to claim 3, which is characterized in that the input voltage comparison circuit packet
Include the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10 and eleventh resistor R11, the first reference voltage source
D2 and the second reference voltage source D3, wherein the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9 series connection
Connection, the 7th resistance R7 connect the input anode of the power module, the 9th resistance R9 ground connection, the 8th resistance
The connecting pin of R8 and the 9th resistance R9 are connect with the datum mark of the first reference voltage source D2, first reference voltage
The cathode of source D2 is connect with the cathode of the second photoelectrical coupler U2, the plus earth of the first reference voltage source D2；
The tenth resistance R10 and eleventh resistor R11 is connected in series, the tenth resistance R10 and the power module
The connection of input anode, eleventh resistor R11 ground connection, the connection of the tenth resistance R10 and the eleventh resistor R11
End is connect with the datum mark of the second reference voltage source D3, the cathode and the 7th resistance of the second reference voltage source D3
R7 is connected with the connecting pin of the 8th resistance R8, the plus earth of the second reference voltage source D3.
5. the protection circuit of power module according to claim 4, which is characterized in that the output overcurrent protects circuit packet
Include current comparison circuit, the 5th photoelectrical coupler U5, the 6th photoelectrical coupler U6 and silicon-controlled D4, the current comparison circuit with
The current sampling port of the power module outlet and the connection of the control electrode of the silicon-controlled D4, the cathode of the silicon-controlled D4
Ground connection, the anode of the silicon-controlled D4 are connect with the cathode of the 5th photoelectrical coupler U5, the 5th photoelectrical coupler U5
Collector and its emitter connect respectively with the base stage of the triode Q1 and its emitter；
The anode of the 5th photoelectrical coupler U5 is connect with the cathode of the 6th photoelectrical coupler U6, the 6th photoelectricity coupling
The anode and its collector of clutch U6 passes through twelfth resistor R12 and thirteenth resistor R13 and the auxiliary power module respectively
Output plus terminal connection, the emitter of the 6th photoelectrical coupler U6 is connect with the anode of the second light emitting diode D5, described
The minus earth of second light emitting diode D5；
The current comparison circuit is used for when the current value of the power module outlet is greater than the current threshold, the electricity
Flow the comparison circuit output control signal control silicon-controlled D4 conducting, when the silicon-controlled D4 is connected, the 5th photoelectricity coupling
Clutch U5 and the 6th photoelectrical coupler U6 conducting；Wherein, when the 5th photoelectrical coupler U5 is connected, the solid-state relay
Device disconnects, and when the 6th photoelectrical coupler U6 is connected, the second light emitting diode D5 shines.
6. the protection circuit of power module according to claim 5, which is characterized in that the current comparison circuit includes steady
Volt circuit and comparator, the voltage regulator circuit include third reference voltage source D6 and capacitor C1, the third reference voltage source D6
Cathode by connect the 14th resistance R14 connect with the output plus terminal of the auxiliary power module, the third reference voltage
It connects between the cathode and its datum mark of source D6, is connected in parallel between the datum mark and its anode of the third reference voltage source D6
Capacitor C1, the plus earth of the third reference voltage source D6；
The input negative terminal of the comparator is connect with the 15th resistance R15 and the 16th resistance R16, the 15th resistance R15
It is connected in series with the 16th resistance R16, the cathode of the 15th resistance R15 and the third reference voltage source D6 connect
It connects, the input anode of the 16th resistance R16 ground connection, the comparator passes through the 17th resistance R17 connection electricity of series connection
The output end of the current sampling port of source module output, the comparator passes through the 18th resistance R18 of the series connection and silicon-controlled D4
Control electrode connection；The current value of the power module outlet be greater than the current threshold when, the comparator it is same mutually defeated
The voltage for entering end is greater than the voltage of its reverse input end, and the comparator exports the control signal.
7. the protection circuit of power module according to claim 6, which is characterized in that the output overvoltage protection circuit packet
Include output voltage comparison circuit and the 7th photoelectrical coupler U7, the output of the output voltage comparison circuit and the power module
The anode of the connection of the cathode of anode and the 7th photoelectrical coupler U7, the 7th photoelectrical coupler U7 passes through series connection the tenth
Nine resistance R19 are connect with the output plus terminal of the auxiliary power module, and the collector of the 7th photoelectrical coupler U7 passes through string
Join the 20th resistance R20 to connect with the input anode of output overcurrent protection circuit, the hair of the 7th photoelectrical coupler U7
Emitter-base bandgap grading is connect with the control electrode of the silicon-controlled D4；
The output voltage comparison circuit is used to make when the output voltage of the power module is greater than the tertiary voltage threshold value
The 7th photoelectrical coupler U7 conducting, when the 7th photoelectrical coupler U7 is connected, the silicon-controlled D4 and the 5th light
Electric coupler U5 conducting, the solid-state relay shutdown.
8. the protection circuit of power module according to claim 7, which is characterized in that the output voltage comparison circuit packet
Include the 4th reference voltage source D7, the 21st resistance R21 and the 22nd resistance R22, the 21st resistance R21 and described
22nd resistance R22 is connected in series, and the 21st resistance R21 is connect with the output plus terminal of the power module, described
22nd resistance R22 ground connection, the connecting pin of the 21st resistance R21 and the 22nd resistance R22 and described the
The datum mark of four reference voltage source D7 connects, and the cathode of the 4th reference voltage source D7 is with the 7th photoelectrical coupler U7's
Cathode connection, the plus earth of the 4th reference voltage source D7.
9. a kind of power module, which is characterized in that the protection circuit including the described in any item power modules of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910675205.2A CN110289597A (en) | 2019-07-25 | 2019-07-25 | A kind of power module and its protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910675205.2A CN110289597A (en) | 2019-07-25 | 2019-07-25 | A kind of power module and its protection circuit |
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| CN110289597A true CN110289597A (en) | 2019-09-27 |
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| CN201910675205.2A Pending CN110289597A (en) | 2019-07-25 | 2019-07-25 | A kind of power module and its protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110706472A (en) * | 2019-11-08 | 2020-01-17 | 桂林航天电子有限公司 | SSPC system and method based on wireless communication |
| CN112216556A (en) * | 2020-10-13 | 2021-01-12 | 许继集团有限公司 | Low-power-consumption trip protection loop |
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| CN209994098U (en) * | 2019-07-25 | 2020-01-24 | 西安霍威电源有限公司 | Power module and protection circuit thereof |
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| CN203761022U (en) * | 2013-12-31 | 2014-08-06 | 洛阳隆盛科技有限责任公司 | High-efficiency direct-current input protection circuit |
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