CN106505882B - A kind of high_voltage isolation detection control circuit of high-frequency and high-voltage power supply - Google Patents

A kind of high_voltage isolation detection control circuit of high-frequency and high-voltage power supply Download PDF

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Publication number
CN106505882B
CN106505882B CN201611143893.0A CN201611143893A CN106505882B CN 106505882 B CN106505882 B CN 106505882B CN 201611143893 A CN201611143893 A CN 201611143893A CN 106505882 B CN106505882 B CN 106505882B
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China
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end
voltage
circuit
high
module
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CN201611143893.0A
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Chinese (zh)
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CN106505882A (en
Inventor
王秀琳
高聪哲
蒋根才
张金林
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盐城工学院
盐城正邦环保科技有限公司
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Publication of CN106505882B publication Critical patent/CN106505882B/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M2001/0003Details of control, feedback and regulation circuits
    • H02M2001/0012Control circuits using digital or numerical techniques

Abstract

The present invention relates to a kind of high_voltage isolations of high-frequency and high-voltage power supply to detect control circuit, belongs to voltage detecting technical field.The high_voltage isolation detects control circuit:Voltage acquisition module, carrier signal conditioning module, signal modulation module, isolation transformer module and signal demodulation module.The voltage acquisition module, the signal modulation module, the isolation transformer module and the signal demodulation module successively couple, and the carrier signal conditioning module is coupled with the signal modulation module.High_voltage isolation detection control circuit is isolated by high-frequency high-voltage circuit with low-voltage circuit, is effectively reduced interference of the high pressure to low pressure, is improved the anti-interference ability of circuit, improves the stability and reliability of whole set equipment.

Description

A kind of high_voltage isolation detection control circuit of high-frequency and high-voltage power supply

Technical field

The invention belongs to voltage detecting technical fields, and in particular to a kind of high_voltage isolation detection control of high-frequency and high-voltage power supply Circuit.

Background technique

With the appearance of Development of Power Electronic Technology, especially high power device, Switching Power Supply develops to high-power direction, Some industrial equipments such as electric precipitator, ozone generator etc. can greatly improve its use using high-power high-frequency high-voltage power supply Effect, and these high-power high-frequency high-voltage power supplys its output voltages can usually be up to several kilovolts to tens kilovolts, in order to guarantee The stability and controllability of output voltage, master controller need to detect output voltage size by detection circuit and go control high frequency high The voltage output of voltage source.

The structural block diagram of high-frequency and high-voltage power supply, as shown in Figure 1, three-phase input power supply is after inductance filter filters through three-phase Bridge rectifier changes into direct current, and direct current is reverse into high-frequency alternating current through high-frequency inverter, then rises through high frequency transformer into height Pressure, is supplied to external equipment, such as deduster;Effect of the high-voltage detecting circuit in entire high-frequency and high-voltage power supply is measurement high-frequency electrical The size of source output voltage, and send master controller to, to adjust output voltage.

In currently available technology, the high-voltage detecting circuit of high-frequency and high-voltage power supply, as shown in Fig. 2, the circuit is using resistance point Depressor samples output voltage, and the output voltage after sampling removes the electricity of control master controller after the adjusting of conditioning circuit Pressure output.High-frequency high-voltage signal is directly introduced low-pressure side by this method, can bring serious interference to the circuit of low-pressure side, often Often make lower-voltage circuit cisco unity malfunction, more serious situation is may to burn out low voltage component, and lead to equipment can It is poor by property.Therefore this method, which has not adapted to whole set equipment, need to meet the requirement of high reliability and stability.

Summary of the invention

The purpose of the present invention is to provide a kind of high_voltage isolations of high-frequency and high-voltage power supply to detect control circuit, effectively to change The kind above problem.

The embodiment of the invention provides a kind of high_voltage isolations to detect control circuit, including:Voltage acquisition module, carrier signal Conditioning module, signal modulation module, isolation transformer module and signal demodulation module.The voltage acquisition module, the signal Modulation module, the isolation transformer module and the signal demodulation module successively couple, the carrier signal conditioning module with The signal modulation module coupling.The voltage acquisition module is sampled and is improved to high-frequency and high-voltage power supply output voltage, and Give the voltage transmission after conditioning to the signal modulation module;The carrier wave that the carrier signal conditioning module generates master controller Signal is improved, and the high-frequency carrier signal after conditioning is transferred to the signal modulation module;The signal modulation module will The voltage of the voltage acquisition module output is mutually modulated with the high-frequency carrier signal after carrier signal conditioning module conditioning, Modulated signal is exported to the isolation transformer module;Modulated signal is transferred to the signal solution by the isolation transformer module Mode transfer block;High-tension circuit and low-voltage circuit are isolated, interference of the high pressure to low pressure is effectively reduced;The signal solution mode transfer Block demodulates the modulated signal that the isolation transformer module exports, output low frequency or direct current signal.

In the embodiment of the present invention, the voltage acquisition module includes:The voltage acquisition module includes:Electric resistance partial pressure electricity Road and the first conditioning circuit, the resistor voltage divider circuit are coupled with first conditioning circuit, first conditioning circuit and institute State signal modulation module coupling;The resistor voltage divider circuit samples the output voltage of high-frequency and high-voltage power supply, and will sampling Voltage transmission afterwards gives first conditioning circuit;First conditioning circuit is to the electricity after resistor voltage divider circuit sampling Pressure is improved, and gives the voltage transmission after conditioning to the signal modulation module.

In an embodiment of the present invention, the carrier signal conditioning module includes:Second conditioning circuit and first is put Big circuit, the carrier signal that the master controller generates are electric after second conditioning circuit conditioning, then through first amplification The signal modulation module is transferred to after the amplification of road;Second conditioning circuit includes:16th resistance, the 11st capacitor and Seven comparators, first amplifying circuit include:17th resistance, the 18th resistance and the 8th comparator;16 resistance One end connect with one end of the 11st capacitor, the first of the other end of the 16th resistance and the 7th comparator Input terminal connection, the other end of the 11st capacitor connect with the second input terminal of the 7th comparator and output end respectively It connecing, the output end of the 7th comparator is connect by the 17th resistance with the first input end of the 8th comparator, The first input end of 8th comparator is connect by the 18th resistance with its output end, and the of the 8th comparator The output end of two input end groundings, the 8th comparator is connect with the signal modulation module, wherein 16 resistance One end is also connect with the master controller.

In an embodiment of the present invention, the signal modulation module includes:Multiplier and the second amplifying circuit, it is described Multiplier is for by the output voltage after first conditioning circuit improves and after first amplifying circuit amplification conditioning High-frequency carrier signal be modulated into modulated signal, and be transferred to second amplifying circuit;Second amplifying circuit includes:The 13 resistance, the 15th resistance, third comparator and the 8th capacitor, the multiplier respectively with first conditioning circuit, institute One end coupling of the first amplifying circuit and the thirteenth resistor is stated, the other end of the thirteenth resistor is compared with the third The first input end of device couples, and the first input end of the third comparator passes through the 15th resistance and its output end coupling It closes, the second input end grounding of the third comparator, the output end of the third comparator passes through the 8th capacitor and institute State isolation transformer module coupling.

In an embodiment of the present invention, the isolation transformer module includes:Isolating transformer, the isolation transformation The input terminal of device is coupled with the output end of second amplifying circuit, and the output end of the isolating transformer and the signal demodulate Module coupling.

In an embodiment of the present invention, the signal demodulation module includes:Detecting circuit, third amplifying circuit and low Bandpass filter circuit, the detecting circuit are coupled with the isolation transformer module and the third amplifying circuit respectively, and described Three amplifying circuits are coupled with the low-pass filter circuit.

In an embodiment of the present invention, the detecting circuit includes:First resistor, second resistance, 3rd resistor, One comparator, first diode and the second diode, one end of the first resistor are coupled with the isolation transformer module, institute The other end for stating first resistor is coupled with the reverse input end of the first comparator, the noninverting input of the first comparator Ground connection, one end of one end of the second resistance and the 3rd resistor respectively with the reverse input end coupling of the first comparator It closes, the other end of the second resistance is coupled with the positive terminal of the third amplifying circuit and the first diode respectively, institute The other end for stating 3rd resistor is coupled with the negative pole end of the third amplifying circuit and second diode respectively, and described first The output end of comparator is coupled with the positive terminal of the negative pole end of the first diode and second diode respectively.

In an embodiment of the present invention, the third amplifying circuit includes:4th resistance, the 5th resistance and the second ratio Compared with device, one end of the 4th resistance is coupled with the other end of the second resistance, the other end of the 4th resistance with it is described The reverse input end of second comparator couples, the noninverting input of second comparator and the other end coupling of the 3rd resistor Close, one end of the 5th resistance couples with the reverse input end of second comparator, the other end of the 5th resistance and The output end of second comparator couples, and the output end of second comparator is coupled with the low-pass filter circuit.

In a kind of case study on implementation of the invention, the low-pass filter circuit includes:6th resistance and first capacitor, it is described One end of 6th resistance is coupled with the output end of second comparator, the other end of the 6th resistance and the first capacitor One end coupling, the first capacitor the other end ground connection.

The embodiment of the invention provides a kind of high_voltage isolations of high-frequency and high-voltage power supply to detect control circuit.The high_voltage isolation Detect voltage acquisition module, signal modulation module, isolation transformer module and the signal demodulation module successively coupling in control circuit It closes, the carrier signal conditioning module is coupled with the signal modulation module.High-frequency and high-voltage power supply output voltage is through voltage acquisition Carrier signal after module samples and conditioning with the output of carrier signal conditioning module is modulated into modulated signal through signal modulation module It is conveyed to the isolation transformer module, the modulated signal is transferred to the signal solution mode transfer by the isolation transformer module Block is demodulated, output low frequency or direct current signal.Isolation transformer module is by the high-tension circuit and low pressure in high-frequency power supply circuit Circuit is isolated by transformer, is significantly reduced interference of the high pressure to low pressure, is improved the anti-interference ability of circuit, Improve the stability and reliability of whole set equipment.

Other features and advantages of the present invention will be illustrated in subsequent specification, also, partly be become from specification It is clear that being understood by implementing the embodiment of the present invention.The objectives and other advantages of the invention can be by written Specifically noted structure is achieved and obtained in specification, claims and attached drawing.

Detailed description of the invention

It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.By the way that shown in attached drawing, above and other purpose of the invention, feature and advantage will be more clear.In whole Identical appended drawing reference indicates identical part in attached drawing.Attached drawing, emphasis deliberately are not drawn by actual size equal proportion scaling It is to show the gist of the present invention.

Fig. 1 shows a kind of structural block diagram of high-frequency and high-voltage power supply.

Fig. 2 shows the structural block diagrams of the high-voltage detecting circuit in Fig. 1.

Fig. 3 shows the structural frames of the high_voltage isolation detection control circuit of high-frequency and high-voltage power supply provided in an embodiment of the present invention Figure.

Fig. 4 shows the circuit diagram of the voltage acquisition module in Fig. 3 provided in an embodiment of the present invention.

Fig. 5 shows the circuit diagram of the carrier signal conditioning module in Fig. 3 provided in an embodiment of the present invention.

Fig. 6 shows the circuit diagram of the signal modulation module in Fig. 3 provided in an embodiment of the present invention.

Fig. 7 shows the circuit diagram of the isolation transformer module in Fig. 3 provided in an embodiment of the present invention.

Fig. 8 shows the circuit diagram of the signal demodulation module in Fig. 3 provided in an embodiment of the present invention.

Icon:10- high_voltage isolation detects control circuit;11- voltage acquisition module;111- resistor voltage divider circuit; The first conditioning circuit of 112-;12- carrier signal conditioning module;The second conditioning circuit of 121-;The first amplifying circuit of 122-; 13- signal modulation module;131- multiplier;The second amplifying circuit of 132-;14- isolation transformer module;15- signal solution Mode transfer block;151- detecting circuit;152- third amplifying circuit;153- low-pass filter circuit.

Specific embodiment

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented The component of example can be arranged and be designed with a variety of different configurations.

Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects It encloses.

It should be noted that:Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.

In the description of the present invention, it should be noted that the orientation of instructions such as term " left side ", " the right ", " centre " or Positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when the orientation usually put or Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.In addition, art Language " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.

In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " coupling ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect It connects;It can be mechanical connection, be also possible to be electrically connected;It can be directly connected, can also indirectly connected through an intermediary, it can To be the connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition Concrete meaning in the present invention.

In order to solve in the prior art, the high-voltage detecting circuit of high-frequency and high-voltage power supply directly introduces high-frequency high-voltage signal low When pressing side, serious interference can be brought to the circuit of low-pressure side, usually make lower-voltage circuit cisco unity malfunction, more serious feelings Condition is may to burn out low voltage component, the problem for causing the reliability of equipment poor.The embodiment of the present invention is directed to existing height The shortcoming for pressing detection circuit provides a kind of high_voltage isolation detection control circuit 10 applied in high-frequency and high-voltage power supply, As shown in Figure 3.The high_voltage isolation detects control circuit 10:Voltage acquisition module 11, carrier signal conditioning module 12, letter Number modulation module 13, isolation transformer module 14 and signal demodulation module 15.

The voltage acquisition module 11 will be improved for the output voltage of high-frequency and high-voltage power supply to be sampled and improved Output voltage afterwards is transferred to 13 first conditioning circuit 112 of signal modulation module.The voltage acquisition module 11 can be Voltage collection circuit and voltage collector etc..In this present embodiment, the preferably described voltage acquisition module 11 includes:Resistance point Volt circuit 111 and the first conditioning circuit 112, as shown in Figure 4.

As shown in left side dotted line frame in Fig. 4, the resistor voltage divider circuit 111 includes:First port 1, the 8th resistance R8, Nine resistance R9, the tenth resistance R10, third bi-directional voltage stabilizing diode D3, the 4th bi-directional voltage stabilizing diode D4 and the 5th bi-directional voltage stabilizing Diode D5.One end of the 8th resistance R8 is connect with the first port 1, the other end of the 8th resistance R8 with it is described One end of 9th resistance R9 connects, and the other end of the 9th resistance R9 is connect with one end of the tenth resistance R10, and described the The other end of ten resistance R10 is grounded.One end of the third bi-directional voltage stabilizing diode D3 is connect with the first port 1, described The other end of third bi-directional voltage stabilizing diode D3 respectively with the other end and the 4th bi-directional voltage stabilizing two of the 8th resistance R8 One end of pole pipe D4 connects, the other end of the 4th bi-directional voltage stabilizing diode D4 respectively with the other end of the 9th resistance R9 and institute One end connection of the 5th bi-directional voltage stabilizing diode D5 is stated, one end of the 5th bi-directional voltage stabilizing diode D5 is respectively with the described tenth The other end of resistance R10 and first conditioning circuit 112 connection.Wherein, the first port 1 is for receiving high frequency electric source Output voltage.Wherein, output voltage is conveyed to after the 8th resistance R8, the 9th resistance R9, the tenth resistance R10 are acquired One conditioning circuit 112.Third bi-directional voltage stabilizing diode D3, the 4th bi-directional voltage stabilizing diode D4 and the 5th bi-directional voltage stabilizing diode D5 carries out clipping to the voltage at the 8th resistance R8 of resistance, the 9th resistance R9, the tenth both ends resistance R10 respectively.

First conditioning circuit 112 is coupled with the resistor voltage divider circuit 111, and first conditioning circuit 112 is used for Output voltage after 111 first conditioning circuit 112 of resistor voltage divider circuit sampling is improved, and will be defeated after conditioning Voltage transmission gives the signal modulation module 13 out.In this present embodiment, described as shown in the right dotted line frame in Fig. 4, described the One conditioning circuit 112 includes:Twelfth resistor R12, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7, Chip U1 and second port 2.The chip U1 includes:First input end, the second input terminal, the first power end, second source end And output end.One end of the twelfth resistor R12 is connect with one end of the 4th capacitor C4, the twelfth resistor R12 The other end connect respectively with one end of the first input end of the chip U1 and the 5th capacitor C5, the five capacitors C5's Other end ground connection.The other end of the 4th capacitor C4 is connect with the second input terminal of the chip U1 and second port 2 respectively. The first power end of the chip U1 is grounded by the 6th capacitor C6, and the second source end of the chip U1 passes through described the Seven capacitor C7 ground connection.In addition, first power end also connects to power supply;The second source end also connects to power supply.It is described Second port 2 is connect with the output end of the chip U1, and the second port 2 is connect with the voltage regulator module 13.Wherein, The power supply of first power end connection and the power supply that the second source end the connects power supply that can be two different, can also be with It is the different ends of the same power supply.

Wherein it is preferred to which the first input end is noninverting input, second input terminal is reverse input end, described First power end is positive power end, and the second source end is negative sense power end.

Wherein, the resistor voltage divider circuit 111 is coupled with first conditioning circuit 112.Further, the resistance point Volt circuit 111 is coupled by eleventh resistor R11 with first conditioning circuit 112.One end of the eleventh resistor R11 with The other end of tenth resistance R10 of resistor voltage divider circuit 111 connects, the other end of the eleventh resistor R11 and described first One end of the twelfth resistor R12 in conditioning circuit 112 connects.

The carrier signal that the carrier signal conditioning module 12 is used to generate master controller improves, and will be after conditioning Signal be transferred to the signal modulation module 13.Wherein, the frequency of the preferably described carrier signal is (50-100) KHZ.It is described Carrier signal conditioning module 12 includes:Second conditioning circuit 121 and the first amplifying circuit 122, as shown in Figure 5.Such as the left side in Fig. 5 Shown in dotted line frame, preferably described second conditioning circuit 121 includes:Tenth port 10, the 16th resistance R16, the 11st capacitor C11, the 12nd capacitor C12 and the 7th comparator U7.The 7th comparator U7 includes:First input end, the second input terminal and Output end.On the one hand, the first input end of the 7th comparator U7 is grounded by the 12nd capacitor C12, on the other hand, described The first input end of 7th comparator U7 is also connect with one end of the 16th resistance R16.The of the 7th comparator U7 Two input terminals are connect with the output end of one end of the 11st capacitor C11 and the 7th comparator U7 respectively.Tenth port 10 connect with the other end of the other end of the 11st capacitor C11 and the 16th resistance R16 respectively.Tenth port 10 with the master controller for connecting.

Wherein it is preferred to which the first input end of the 7th comparator U7 is noninverting input, the second of described U7 is defeated Entering end is reverse input end.

As shown in the right dotted line frame in Fig. 5, preferably described first amplifying circuit 122 includes:17th resistance R17, the tenth Eight resistance R18, the 8th comparator U8, the 13rd capacitor C13, the 14th capacitor C14 and the tenth Single port 11.Described 8th compares Device U8 includes:First input end, second the first power end of input terminal, second source end and output end.The 8th comparator U8 First input end ground connection, the second input terminal of the 8th comparator U8 respectively with one end of the 17th resistance R17 and One end of 18th resistance R18 connects.The other end of the 17th resistance R17 and the output end of the 7th comparator U7 connect It connects, the other end of the 18th resistance R18 is connect with the output end of the 8th comparator U8 and the tenth Single port 11 respectively. The first power end of the 8th comparator U8 is grounded by the 13rd capacitor C13, the second source of the 8th comparator U8 End is grounded by the 14th capacitor C14.In addition, the first power end of the 8th comparator U8 also connects to power supply.Described The second source end of eight comparator U8 also connects to power supply.Second conditioning circuit 121 is exported electricity by first amplifying circuit 122 Pressure amplifies.

Wherein it is preferred to which the first input end of the 8th comparator U8 is non-inverting input terminal, the 8th comparator U8 The second input terminal be inverting input terminal, the first power end of the 8th comparator U8 is positive power end, the 8th ratio Second source end compared with device U8 is negative sense power end.Tenth Single port 11 is used for and the institute in the signal modulation module 13 State the connection of the 4th port.

The signal modulation 13, conditioned signal and carrier signal for exporting the voltage acquisition module 11 improve mould The carrier signal that block 12 exports mutually is modulated, and output modulated signal is transferred to the isolation transformer module 14.The signal modulation Module 13 includes:Multiplier 131 and the second amplifying circuit 132, as shown in Figure 6.

As shown in left side dotted line frame in Fig. 6, the multiplier 131 includes:Third port 3, the 4th port 4 and chip U2. The chip U2 includes Y1, Y2, X1, X2, VS-, Vs+, Z and W leads ends.The Y1 leads ends and the third port 3 connect It connects, the Y2 leads ends ground connection, the Vs- leads ends connect to power supply.The Z leads ends ground connection, the X2 pin termination Ground, the X1 leads ends are connect with the 4th port 4, and the VS+ leads ends connect to power supply.The W leads ends with it is described The connection of second amplifying circuit 132.The third port 3 is connect with the second port 2 in first conditioning circuit 112.It is described 4th port 4 is connect with the carrier signal conditioning module 12.

The multiplier 131 is for by the output voltage after first conditioning circuit 112 improves and through the carrier wave The signal modulation that signal conditioning module 12 exports is at modulated signal.

As shown in the right dotted line frame in Fig. 6, second amplifying circuit 132 includes:Thirteenth resistor R13, the 14th electricity Hinder R14, the 15th resistance R15, the 8th capacitor C8, third comparator U3 and fifth port 5.The third comparator U3 includes the One input terminal, the second input terminal and output end.The W leads ends of one end of the thirteenth resistor R13 and the multiplier 131 connect It connects, the other end of the thirteenth resistor R13 first input end and the 15th resistance R15 with the third comparator U3 respectively One end connection.The other end of the 15th resistance R15 is connect with the output end of the third comparator U3.The third ratio The second input terminal compared with device U3 is grounded by the 14th resistance R14.The output end of the third comparator U3 passes through the 8th capacitor C8 is connect with the fifth port 5.The fifth port 5 is connect with the isolation transformer module 14.The second amplification electricity Road 132 amplifies the output voltage of the multiplier 131.

Wherein it is preferred to which the first input end of the third comparator U3 is inverting input terminal, the third comparator U3 The second input terminal be non-inverting input terminal.

The isolation transformer module 14 is used to modulated signal being transferred to the signal demodulation module 15, by high-tension circuit It is isolated with low-voltage circuit, reduces interference of the high pressure to low pressure.The isolating transformer U4 includes:First input end, second Input terminal, the first output end and second output terminal, as shown in Figure 7.The first input end of the isolating transformer U4 and described the The connection of six ports 6.The second input end grounding of the isolating transformer U4, the first output end of the isolating transformer U4 and institute State the connection of the 7th port 7, the second output terminal ground connection of the isolating transformer U4.6th port 6 is used for and the signal Fifth port 5 in modulation module 13 connects, and the 7th port 7 with the signal demodulation module 158 for connecting.

Wherein, in this present embodiment, it is preferable that the shape of the isolating transformer iron core is annular or rectangle, using iron Ferrite is made, and the first winding and the second winding use overlapping type coiling, no-load voltage ratio 1:1.

The signal demodulation module 15 is coupled with the isolation transformer module 14, and the signal demodulation module 15 is used for will The modulated signal transmitted through the isolation transformer module 14 is demodulated, output low frequency or direct current signal.It is preferred that described Signal demodulation module 15 includes:Detecting circuit 151, third amplifying circuit 152 and low-pass filter circuit 153, as shown in Figure 8.

As shown in left side dotted line frame in Fig. 8, the preferably described detecting circuit 151 includes:8th port 8, first resistor R1, Two resistance R2,3rd resistor R3, the 7th resistance R7, the second capacitor C2, third capacitor C3, first diode D1, the second diode D2 and first comparator chip U5.The chip U5 includes first input end, the second input terminal, the first power end, second source End and output end.The first input end of the chip U5 is grounded by the 7th resistance R7, and the first power end of the chip U5 is logical The second capacitor C2 ground connection is crossed, the second input terminal of the chip U5 is connect with one end of the first resistor R1, the chip U5 Second source end by third capacitor C3 be grounded, the output end of the chip U5 respectively with the other end of first diode D1 and The connection of the other end of second diode D2.In addition, the first power end of the chip U5 also connects to power supply.The chip U5 Second source end also connect to power supply.The other end of the first resistor R1 is connect with the 8th port 8.The first resistor One end of R18 is also connect with one end of one end of the second resistance R2 and 3rd resistor R3 respectively.The second resistance R2's The other end is connect with one end of the first diode D1, and the other end of the 3rd resistor R3 is with the second diode D2's One end connection.The other end of the second resistance D2 is also connect with 152 first input end of third amplifying circuit, the third The other end of resistance R3 is also connect with the second input terminal of the third amplifying circuit 152.

The detecting circuit 151 is exported by first diode D1, the second diode D2 to through isolation transformer module 14 Voltage carry out full-wave detection, and be transferred to third amplifying circuit 152.

Wherein it is preferred to which the first input end of the chip U5 is noninverting input, the second input terminal of the chip U5 For reverse input end, the first power end of the chip U5 is positive power end, and the second source end of the chip U5 is negative sense Power end.One end of the first diode D1 is positive terminal, and the other end of first diode D1 is negative pole end.Described 2nd 2 One end of pole pipe D2 is negative pole end, and the other end of the second diode D2 is positive terminal.8th port 8 with described for being isolated The 7th port 7 connection in transformer module 14.

As shown in dashed middle line frame in Fig. 8, the preferably described third amplifying circuit 152 includes:4th resistance R4, the 5th resistance R5 and the second comparator chip U6.The chip U6 includes:First input end, the second input terminal and output end.The chip U6 First input end connect respectively with one end of one end of the 4th resistance R4 and the 5th resistance R5, the chip U6's Second input terminal is connect with the other end of the 3rd resistor R3 in the detecting circuit 151, the output end of the chip U6 It is connect with the other end of the 5th resistance R5.The other end of the 4th resistance R4 with it is described in the detecting circuit 151 The other end of second resistance R2 connects.In addition, the output end of the chip U6 is also connect with the low-pass filter circuit 153.

The voltage that the third amplifying circuit 152 is used to export detecting circuit 151 amplifies, and is transferred to low pass filtered Wave circuit 153 is filtered.

Wherein it is preferred to which the first input end of the chip U6 is reverse input end, the second input terminal of the chip U6 For noninverting input.

As shown in the right dotted line frame in Fig. 8, the preferably described low-pass filter circuit 153 includes the 6th resistance R6, first capacitor C1 and the 9th port 9.One end of the 6th resistance R6 and the output end of the chip U6 in the third amplifying circuit 152 Connection, the other end of the 6th resistance R6 are connect with the 9th port 9.In addition, the other end of the 6th resistance R6 also passes through First capacitor C1 ground connection.9th port 9 is for connecting master controller.

The high_voltage isolation detection control circuit 10 principle be:The output voltage of high frequency rectifying device output is through voltage acquisition The sampling of module 11 and conditioning, the carrier wave that output voltage and carrier signal conditioning module 12 after conditioning export are believed in signal modulation mould It is modulated in block 13, output modulated signal is transferred to isolation transformer module 14, is transferred to signal demodulation module through isolating transformer 15 are demodulated, and the size of master controller de-regulation output voltage is then transferred to.It is logical that the high_voltage isolation detects control circuit 10 It crosses isolating transformer transmission high-tension circuit is isolated with low-voltage circuit, significantly reduces interference of the high pressure to low pressure, The anti-interference ability for improving circuit improves the stability and reliability of whole set equipment.

In conclusion the embodiment of the invention provides a kind of high_voltage isolations of high-frequency and high-voltage power supply to detect control circuit, it should High_voltage isolation detection control circuit is isolated by high-frequency and high-voltage power supply medium-high frequency high-tension circuit with low-voltage circuit, is effectively reduced Interference of the high-frequency high-voltage circuit to low-voltage circuit, improves low-voltage circuit job stability and reliability.Improve entire electricity The anti-interference ability on road improves the stability and reliability of whole set equipment.It ensure that the high-frequency and high-voltage power supply final output Voltage is adjusted according to actual needs, stablizes it in setting value.

The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (7)

1. a kind of high_voltage isolation of high-frequency and high-voltage power supply detects control circuit, which is characterized in that including:Voltage acquisition module, load Wave signal conditioning module, signal modulation module, isolation transformer module and signal demodulation module;The voltage acquisition module, institute It states signal modulation module, the isolation transformer module and the signal demodulation module successively to couple, the carrier signal conditioning Module is coupled with the signal modulation module;
The voltage acquisition module is sampled and is improved to high-frequency and high-voltage power supply output voltage, and by the voltage transmission after conditioning To the signal modulation module, wherein the voltage acquisition module includes:Resistor voltage divider circuit and the first conditioning circuit, it is described Resistor voltage divider circuit is coupled with first conditioning circuit, and first conditioning circuit is coupled with the signal modulation module;Institute It states resistor voltage divider circuit to sample the output voltage of high-frequency and high-voltage power supply, and gives described first for the voltage transmission after sampling Conditioning circuit;First conditioning circuit improves the voltage after resistor voltage divider circuit sampling, and will be after conditioning Voltage transmission give the signal modulation module;
The carrier signal conditioning module improves the carrier signal that master controller generates, and the high frequency carrier after conditioning is believed Number it is transferred to the signal modulation module;
The voltage and improved through the carrier signal conditioning module that the signal modulation module exports the voltage acquisition module High-frequency carrier signal afterwards is mutually modulated, and exports modulated signal to the isolation transformer module;
Modulated signal is transferred to the signal demodulation module by the isolation transformer module;By high-tension circuit and low-voltage circuit into Row isolation, effectively reduces interference of the high pressure to low pressure;
The signal demodulation module demodulates the modulated signal that the isolation transformer module exports, output low frequency or direct current Signal, wherein the signal demodulation module includes:Detecting circuit, third amplifying circuit and low-pass filter circuit, the detection electricity Road is coupled with the isolation transformer module and the third amplifying circuit respectively, the third amplifying circuit and the low pass filtered Wave circuit coupling.
2. high_voltage isolation according to claim 1 detects control circuit, which is characterized in that the carrier signal conditioning module Including:Second conditioning circuit and the first amplifying circuit, the carrier signal that the master controller generates is through second conditioning circuit After conditioning, then through first amplifying circuit amplification after be transferred to the signal modulation module;Second conditioning circuit includes: 16th resistance, the 11st capacitor and the 7th comparator, first amplifying circuit include:17th resistance, the 18th resistance With the 8th comparator;One end of 16 resistance is connect with one end of the 11st capacitor, the 16th resistance it is another One end is connect with the first input end of the 7th comparator, and the other end of the 11st capacitor is respectively compared with the described 7th Second input terminal of device is connected with output end, and the output end of the 7th comparator passes through the 17th resistance and the described 8th The first input end of comparator connects, and the first input end of the 8th comparator passes through the 18th resistance and its output end Connection, the second input end grounding of the 8th comparator, the output end of the 8th comparator and the signal modulation module Connection, wherein one end of 16 resistance is also connect with the master controller.
3. high_voltage isolation according to claim 2 detects control circuit, which is characterized in that the signal modulation module packet It includes:Multiplier and the second amplifying circuit, the multiplier be used for by through first conditioning circuit conditioning after output voltage and High-frequency carrier signal after first amplifying circuit amplification conditioning is modulated into modulated signal, and is transferred to second amplification Circuit;Second amplifying circuit includes:Thirteenth resistor, the 15th resistance, third comparator and the 8th capacitor, the multiplication Device is coupled with one end of first conditioning circuit, first amplifying circuit and the thirteenth resistor respectively, and the described tenth The other end of three resistance is coupled with the first input end of the third comparator, and the first input end of the third comparator passes through 15th resistance is coupled with its output end, the second input end grounding of the third comparator, the third comparator Output end is coupled by the 8th capacitor with the isolation transformer module.
4. high_voltage isolation according to claim 3 detects control circuit, which is characterized in that the isolation transformer module packet It includes:Isolating transformer, the input terminal of the isolating transformer are coupled with the output end of second amplifying circuit, and the isolation becomes The output end of depressor is coupled with the signal demodulation module.
5. high_voltage isolation according to claim 1 detects control circuit, which is characterized in that the detecting circuit includes:The One resistance, second resistance, 3rd resistor, first comparator, first diode and the second diode, one end of the first resistor It is coupled with the isolation transformer module, the reverse input end coupling of the other end of the first resistor and the first comparator It closes, the noninverting input ground connection of the first comparator, one end difference of one end of the second resistance and the 3rd resistor Coupled with the reverse input end of the first comparator, the other end of the second resistance respectively with the third amplifying circuit and The positive terminal of the first diode couples, the other end of the 3rd resistor respectively with the third amplifying circuit and described the The negative pole ends of two diodes couples, the output end of the first comparator respectively with the negative pole end of the first diode and described The positive terminal of second diode couples.
6. high_voltage isolation according to claim 5 detects control circuit, which is characterized in that the third amplifying circuit packet It includes:4th resistance, the 5th resistance and the second comparator, one end of the 4th resistance and the other end coupling of the second resistance Close, the other end of the 4th resistance couples with the reverse input end of second comparator, second comparator it is in the same direction Input terminal is coupled with the other end of the 3rd resistor, one end of the 5th resistance and the reversed input of second comparator End coupling, the other end of the 5th resistance are coupled with the output end of second comparator, the output of second comparator End is coupled with the low-pass filter circuit.
7. high_voltage isolation according to claim 6 detects control circuit, which is characterized in that the low-pass filter circuit packet It includes:One end of 6th resistance and first capacitor, the 6th resistance is coupled with the output end of second comparator, and the described 6th The other end of resistance is coupled with one end of the first capacitor, the other end ground connection of the first capacitor.
CN201611143893.0A 2016-12-12 2016-12-12 A kind of high_voltage isolation detection control circuit of high-frequency and high-voltage power supply CN106505882B (en)

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