CN105553286A - Adaptive low-noise DCDC isolated power supply - Google Patents
Adaptive low-noise DCDC isolated power supply Download PDFInfo
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- CN105553286A CN105553286A CN201510966542.9A CN201510966542A CN105553286A CN 105553286 A CN105553286 A CN 105553286A CN 201510966542 A CN201510966542 A CN 201510966542A CN 105553286 A CN105553286 A CN 105553286A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
- H02M3/3378—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current in a push-pull configuration of the parallel type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Abstract
The invention provides an adaptive low-noise DCDC isolated power supply, which comprises a transformer isolation unit, a voltage attenuation unit, a control unit and a switch tube drive unit, wherein the transformer isolation unit comprises a primary coil and a secondary coil; the voltage attenuation unit is used for obtaining a voltage signal from a transformer loop on which the primary coil is located, attenuating the voltage signal and feeding back the voltage signal to the control unit; the control unit is used for carrying out judgment according to the signal fed back by the voltage attenuation unit; and if the voltage signal displays that the transformer loop on which the primary coil is located is in a ringing state, a PWM signal with a corresponding frequency is output to the switch tube drive unit according to the change of a ring, so that the switch tube drive unit conducts the primary coil to work according to the PWM signal.
Description
Technical field
What the present invention relates to high-accuracy measuring instrument supplies electrical domain, particularly relates to a kind of adaptive low-noise DCDC insulating power supply.
Background technology
Traditional DCDC insulating power supply is all the effect being reached voltage stabilizing by the frequency of change switch, does not have the suppression of too much consideration switching noise.
The DCDC insulating power supply comparative maturity of present stage, but most application scenario, not very high to noise requirements, and in measuring instrument, higher to the demand of noise, require very low by Noise measarement, controllable switch noise peak of the present invention is within 100uV, and it is poor mainly can to adapt in isolating transformer inductance value consistency, and load changes, when device aging, noise level can be transferred to extremely low state by power supply automatically.As shown in Figure 1, the switching frequency definite value of the driving switch K1 of push-pull transformer T, K2, circuit design completes and just immobilizes general DCDC power supply.Transformer primary secondary voltage waveform have ring, and the size of ring is relevant with switching frequency
Work as K1, K2 switch is closed, and the instantaneous variation due to loop current causes the ringing of voltage to exist with when opening, and then senses that secondary coil produces ringing, there is the noise making to export U0 and exist as shown in Figure 2 in ring, output voltage exists the switching noise of ring form.In the rectification circuit of secondary, the conducting of diode D1, D2 and cut-off also can produce the switching noise of ring form.
As shown in Figure 3, when system reaches optimum state, the voltage rise in loop or suppression ratio are comparatively slow, there is not the switching noise of ring form.
It is that noise peak peak value is better than 100uV as shown in Figure 4 that power supply source exports.
When system parameters changes, such as transformer inductance value changes, and the existing frequency of switch can make switch voltage waveform change.As shown in Figure 5 when switching tube is opened or close, there is ringing in loop voltage, thus cause power supply to export the larger noise of existence, as shown in Figure 6.
Summary of the invention
The technical problem to be solved in the present invention is how suppressed ringing phenomenon.
In order to solve this technical problem, the invention provides a kind of adaptive low-noise DCDC insulating power supply, comprise transformer isolation unit, described transformer isolation unit comprises primary coil and secondary coil, also comprises voltage attenuation unit, control unit and switching tube driver element;
Described voltage attenuation unit, in order to obtain voltage signal from the transformer circuit residing for described primary coil, feeds back to described control unit after decaying to it;
Described control unit is in order to judge according to the signal of described voltage attenuation unit feedback, if this voltage signal shows transformer circuit residing for described primary coil be in ringing condition, then according to the change of ring, export the pwm signal of corresponding frequencies to described switching tube driver element, make described switching tube driver element according to primary coil work described in described pwm signal conducting.
Optionally, described switching tube driver element comprises the driving switch of primary coil work described in conducting, the primary coil work according to described pwm signal conducting of described driving switch.
Optionally, the quantity of described primary coil is two, be respectively the first primary coil and the second primary coil, the quantity of described driving switch is two, be respectively the second driving switch of the second primary coil work described in the first driving switch of the first primary coil work described in conducting and conducting, described first driving switch and the second driving switch be the first primary coil and the second primary coil generation current according to described pwm signal alternate conduction.
Optionally, described switching tube driver element also comprises inverter circuit, described first driving switch according to through the first primary coil described in pwm signal conducting, the first primary coil described in the pwm signal conducting after described second driving switch is anti-phase according to described negative circuit.
Optionally, described switching tube driver element also comprises delay circuit, the quantity of described delay circuit and the quantity Matching of described driving switch, described delay circuit in order to receive described pwm signal or anti-phase after pwm signal, driving switch work described in delayed rear drive.
Optionally, described delay circuit comprises NAND gate/AND circuit, described pwm signal or anti-phase after pwm signal input from the first input end of described NAND gate/AND circuit; Second input of described NAND gate/AND circuit is connect with reference to ground by electric capacity, and described pwm signal or anti-phase after the electric current of pwm signal reach this electric capacity, the output of described NAND gate/AND circuit connects corresponding described driving switch.
Optionally, described voltage attenuation unit feeds back to described control unit after adopting differential input voltage amplifier circuit to decay to the voltage gathered.
Optionally, described adaptive low-noise DCDC insulating power supply also comprises rectification unit, and described rectification unit carries out rectification in order to respond to secondary coil the alternating current obtained.
Optionally, described rectification unit comprises rectification driving chip and triode, the output of described rectification driving chip connects the control pole of described triode, described rectification driving chip controls described triode in order to respond to according to described secondary coil the alternating current obtained, thus after making the alternating current of described triode to the collector electrode reaching described triode from described secondary coil carry out rectification, exported by the emitter of described triode.
Optionally, described secondary coil comprises first kind secondary coil and Equations of The Second Kind secondary coil, described first kind secondary coil inputs the described input of rectification driving chip and the collector electrode of triode after obtaining alternating current from described primary coil induction, and described Equations of The Second Kind secondary coil is powered for described rectification driving chip after obtaining alternating current from described primary coil induction.
Optionally, the output of described rectification driving chip also passes through capacity earth.
Optionally, the quantity of described rectification driving chip and triode is two, the input of each described rectification driving chip connects a described secondary coil, the output of each described rectification driving chip connects a described triode, and two described triodes are controlled althyrex, output current.
Optionally, described adaptive low-noise DCDC insulating power supply also comprises filter unit, and described filter unit carries out filtering process in order to the direct current will received from described rectification unit.
The present invention effectively reduces the amplitude of the voltage ring in transformer circuit by the closed-loop path of control unit, voltage attenuation unit, switch drive unit, transformer isolation unit composition, and then reduces the switching noise of output voltage.In possibility concrete further, also introduce rectification unit, adopt rectification unit to change traditional diode into transistor, and effectively can control the switching rate of transistor, effectively reduce the switching noise that conventional diode produces, and then reduce the switching noise of output voltage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of DCDC insulating power supply in prior art;
Fig. 2 is the oscillogram exporting U0 when ring exists in prior art;
Fig. 3 is the loop voltage waveform that there is not ringing in prior art;
Fig. 4 is the power supply output waveform figure that there is not ringing in prior art;
The loop voltage oscillogram of ringing is there is in Fig. 5 when being prior art breaker in middle pipe open closed;
The power supply output waveform figure of ringing is there is in Fig. 6 when being prior art breaker in middle pipe open closed;
Fig. 7 is the principle schematic of the adaptive low-noise DCDC insulating power supply that one embodiment of the invention provides;
Fig. 8 is the circuit diagram of the adaptive low-noise DCDC insulating power supply that one embodiment of the invention provides.
Embodiment
Below with reference to Fig. 7 and Fig. 8, adaptive low-noise DCDC insulating power supply provided by the invention is explained in detail, it is optional embodiment of the present invention, can think, those skilled in the art, in the scope not changing the present invention's spirit and content, can modify to it and polish.
Please refer to figure and the invention provides a kind of adaptive low-noise DCDC insulating power supply, comprise transformer isolation unit, described transformer isolation unit comprises primary coil and secondary coil, also comprises voltage attenuation unit, control unit and switching tube driver element;
Described voltage attenuation unit, in order to obtain voltage signal from the transformer circuit residing for described primary coil, feeds back to described control unit after decaying to it;
Described control unit is in order to judge according to the signal of described voltage attenuation unit feedback, if this voltage signal shows transformer circuit residing for described primary coil be in ringing condition, then according to the change of ring, export the pwm signal of corresponding frequencies to described switching tube driver element, make described switching tube driver element according to primary coil work described in described pwm signal conducting.
The present invention effectively reduces the amplitude of the voltage ring in transformer circuit by the closed-loop path of control unit, voltage attenuation unit, switch drive unit, transformer isolation unit composition, and then reduces the switching noise of output voltage.
Launch to set forth to each unit below:
About described voltage attenuation unit:
Its effect also can be expressed as: transformer isolation cell voltage signal is carried out the scope that decay suitable control circuit allows by voltage attenuation unit, is suitable for the collection of control unit ADC.In the embodiment of Fig. 8 signal of the present invention, described voltage attenuation unit feeds back to described control unit after adopting differential input voltage amplifier circuit to decay to the voltage gathered.Furthermore, in optional embodiment of the present invention, for voltage attenuation unit, the reference voltage of the analog to digital converter of control unit is 2.5V, and isolating transformer loop voltage ceiling voltage is no more than 25V, so attenuator needs the voltage attenuation 10 times of 0 ~ 25V, so by R1, the reverse multiplication factor of R2, A1 composition is-1/10.
About described control unit:
Its effect also can be expressed as: control unit by the voltage signal of receiver voltage attenuation units, and carries out analyzing and processing to voltage signal, according to the rate-adaptive pacemaker of the signal behavior suitable switches of voltage attenuator input to switch drive unit; In the embodiment of Fig. 7 signal of the present invention, it is configured with analog to digital converter.
Further specifically, when power work, control unit initial state is set as 200kHz, whether control unit is in non-ringing condition (as shown in Figure 3) by voltage attenuation unit measuring transformer loop voltage, otherwise increase switching frequency, and again detect input voltage situation, if ring becomes large, then reduce output frequency, the waveform through repeatedly feedback regulation transformer circuit voltage the most at last adjusts to Fig. 3 state.
Relevant described switching tube driver element:
Described switching tube driver element comprises the driving switch of primary coil work described in conducting, the primary coil work according to described pwm signal conducting of described driving switch.
In optional embodiment of the present invention, please refer to Fig. 8, the quantity of described primary coil is two, be respectively the first primary coil L1 and the second primary coil L2, the quantity of described driving switch is two, to be respectively described in conducting the second driving switch Q2 that described in the first driving switch Q1 and conducting that the first primary coil L1 works, the second primary coil L2 works, described first driving switch Q1 and the second driving switch Q2 is the first primary coil L1 and the second primary coil L2 generation current according to described pwm signal alternate conduction.Q1, Q2 alternate conduction during normal work, can avoid the first driving switch Q1 and the second driving switch Q2 conducting simultaneously to cause circuit burnout.
In further possibility on this, described switching tube driver element also comprises inverter circuit, first primary coil described in described first driving switch foundation pwm signal conducting, the first primary coil described in the pwm signal conducting after described second driving switch is anti-phase according to described negative circuit.In the embodiment of Fig. 8 signal, inverter circuit adopts two inverter circuit, but be also not limited thereto, first primary coil L2 described in pwm signal conducting after described first driving switch Q1 is once anti-phase according to described pair of negative circuit according to the first primary coil L1, described second driving switch Q2 described in the pwm signal conducting after described pair of negative circuit twice is anti-phase.Again further specifically, described two negative circuits comprise two inverter U1, an one input all connects control unit, receive pwm signal, an output is connected to and is connected to the first driving switch Q1 by corresponding delay circuit, realizes once anti-phase, simultaneously, this output is also connected to another input of two inverter U1, and then makes the output corresponding with this input export twice anti-phase pwm signal, and then reaches the second driving switch Q2 by corresponding delay circuit.
Relevant delay circuit mentioned above, in optional embodiment of the present invention, described switching tube driver element also comprises delay circuit, the quantity of described delay circuit and the quantity Matching of described driving switch, described delay circuit in order to receive described pwm signal or anti-phase after pwm signal, driving switch work described in delayed rear drive.In the embodiment of Fig. 8 of the present invention signal, described delay circuit comprises NAND gate/AND circuit U2 and U3, described pwm signal or anti-phase after pwm signal input from the first input end of described NAND gate/AND circuit U2 and U3; Second input of described NAND gate/AND circuit U2 and U3 connects with reference to ground by electric capacity C2 and C3 respectively, and described pwm signal or anti-phase after the electric current of pwm signal reach this electric capacity C2 and C3, described NAND gate/AND circuit U2 is connected corresponding described driving switch Q1 and Q2 with the output of U3.
Visible, two inverter U1 exports the contrary switching signal of two-way phase place, NAND gate U2 and R5, R6, C2 form delay circuit A, NAND gate U3 and R7, R8, C3 form delay circuit B, and delay circuit A, B constitute driving four district of driving transformer, transformer driving switch Q1, Q2 conducting is simultaneously avoided to cause circuit burnout, Q1, Q2 alternate conduction during normal work.
Relevant described transformer isolation unit:
The electric flux of transformer primary side is sent to secondary by it under the effect of switching tube driver element, and can complete the electrical isolation of transformer primary secondary; Specifically, in the embodiment of Fig. 8 signal, as mentioned above, it comprises two primary coils, is the first sideline, source circle L1 and the second sideline, source circle L2 respectively; Also comprise three secondary coils, be respectively secondary coil L3, L4 and L5, wherein, secondary coil L3 and secondary coil L5 may be defined as again the first kind secondary coil hereafter mentioned, and secondary coil L4 may be defined as again the Equations of The Second Kind secondary coil hereafter mentioned.Transformer isolation unit, under the first driving switch Q1, the second driving switch Q2 alternate conduction, replaces generation current at the first primary coil L1 and the second primary coil L2, makes secondary coil produce induced current, thus energy is coupled to secondary from former limit.
In the embodiment of Fig. 7 and Fig. 8 signal, described adaptive low-noise DCDC insulating power supply also comprises rectification unit, and described rectification unit carries out rectification in order to respond to secondary coil the alternating current obtained.
In optional embodiment of the present invention, described rectification unit comprises rectification driving chip U4 (U5) and triode Q3 (Q4), the output of described rectification driving chip U4 (U5) connects the control pole of described triode Q3 (Q4), described rectification driving chip U4 (U5) controls described triode Q3 (Q4) in order to respond to the alternating current obtained according to described secondary coil, thus after making the alternating current of described triode Q3 (Q4) to the collector electrode reaching described triode Q3 (Q4) from described secondary coil carry out rectification, exported by the emitter of described triode Q3 (Q4).
In optional embodiment of the present invention, described secondary coil comprises first kind secondary coil and Equations of The Second Kind secondary coil, described first kind secondary coil L3 (L5) inputs the input of described rectification driving chip U4 (U5) and the collector electrode of triode Q3 (Q4) after obtaining alternating current from described primary coil induction, and described Equations of The Second Kind secondary coil is powered for described rectification driving chip after obtaining alternating current from described primary coil induction.Wherein, the output of described rectification driving chip U4 (U5) is also by electric capacity C5 (C6) ground connection.
In optional embodiment of the present invention, the quantity of described rectification driving chip and triode is two, is respectively rectification driving chip U4, U5, triode Q3, Q4.The input of each described rectification driving chip connects a described secondary coil, specifically can with reference to figure 8, and the output of each described rectification driving chip connects a described triode, and two described triodes are controlled althyrex, output current.
Visible, secondary coil L3, L5 provide the output of energy, and secondary coil L4 generation high pressure is rectification module switching tube Q3, the driving chip U4 of Q4, U5 provides power supply, because drive current is very little, the ring that diode D1 produces is very little, can ignore the impact on system.When induced current flows to triode Q3 by secondary coil L3, the time delay soft-start circuit of rectification driving chip U4, resistance R9, electric capacity C5 composition makes triode Q3 slowly open, electric current slowly flows out injection electric capacity C7 by triode Q3 and carries out energy storage, and now triode Q4 closes; When induced current flows to triode Q4 by secondary coil L4, the time delay soft-start circuit of rectification driving chip U5, resistance R10, electric capacity C6 composition makes triode Q4 slowly open, and electric current slowly flows out injection C7 by triode Q4 and carries out energy storage.Alternating current is rectified and is stored at electric capacity C7.Due to slowly opening of triode Q3, Q4, switching noise is controlled effectively.
So, in possibility of the present invention, adopt rectification unit to change traditional diode into transistor, and effectively can control the switching rate of transistor, effectively reduce the switching noise that conventional diode produces, and then reduce the switching noise of output voltage.
In the embodiment of Fig. 7 and Fig. 8 signal of the present invention, described adaptive low-noise DCDC insulating power supply also comprises filter unit, and described filter unit carries out filtering process in order to the direct current will received from described rectification unit.Specifically, rectification unit is passed the electric current of coming and carries out filtering process by filter unit, comprising the inductor E1 of band magnetic core, inductor L6 and two electric capacity C8 and C9, inductor E1 is in order to filter out high frequency noise, inductor L6 and electric capacity C8, C9 forms the filtering of pi type, specifically, one end of electric capacity C8 connects one end of described inductor L6, other end ground connection, one end of electric capacity C9 connects the other end of inductor L6, other end ground connection, the connection inductor E1 of described inductor L6, by this design, low-frequency noise in electric current is further reduced.
Visible, in possibility of the present invention, the energy on former limit is sent to secondary by isolating transformer under the control of the control unit, becomes direct current, at supply load after filtering unit filters after the alternating current rectification module that secondary coil exports.
Also it is noted that method by experiment obtains the change of transformer due to parameter, and the change of system load, the scope of its frequency optimum traffic is between 190kHz to 260kHz.
Application background for the present invention, it involves the concrete goal of the invention of the present invention.For fine measuring instrument, its power reguirements has low-down noise, to improve the certainty of measurement of measuring instrument.Technical scheme of the present invention is applied in high-accuracy measuring instrument, needs to improve certainty of measurement, and the present invention, owing to having self-rectification function, can tackle device inconsistency, and the problem of penalty that device aging parameter transformation brings.The noise situations of secondary circuit just can be detected by primary-side circuitry.
By the generation of the mutual suppressed ringing in magnetic field in transformer coil, lower switching noise from source.In highly sophisticated device, the performance due to power supply directly has influence on the certainty of measurement of instrument, and this invention makes the output of DCDC power supply have lower switching noise, improves the certainty of measurement of measuring instrument.Possibility of the present invention noise peak peak value can reach 100uV within (during load current 200mA), improve the resolution of system.
In sum, the present invention effectively reduces the amplitude of the voltage ring in transformer circuit by the closed-loop path of control unit, voltage attenuation unit, switch drive unit, transformer isolation unit composition, and then reduces the switching noise of output voltage.In possibility concrete further, also introduce rectification unit, adopt rectification unit to change traditional diode into transistor, and effectively can control the switching rate of transistor, effectively reduce the switching noise that conventional diode produces, and then reduce the switching noise of output voltage.
Claims (13)
1. an adaptive low-noise DCDC insulating power supply, comprises transformer isolation unit, and described transformer isolation unit comprises primary coil and secondary coil, it is characterized in that: also comprise voltage attenuation unit, control unit and switching tube driver element;
Described voltage attenuation unit, in order to obtain voltage signal from the transformer circuit residing for described primary coil, feeds back to described control unit after decaying to it;
Described control unit is in order to judge according to the signal of described voltage attenuation unit feedback, if this voltage signal shows transformer circuit residing for described primary coil be in ringing condition, then according to the change of ring, export the pwm signal of corresponding frequencies to described switching tube driver element, make described switching tube driver element according to primary coil work described in described pwm signal conducting.
2. adaptive low-noise DCDC insulating power supply as claimed in claim 1, is characterized in that: described switching tube driver element comprises the driving switch of primary coil work described in conducting, the primary coil work according to described pwm signal conducting of described driving switch.
3. adaptive low-noise DCDC insulating power supply as claimed in claim 2, it is characterized in that: the quantity of described primary coil is two, be respectively the first primary coil and the second primary coil, the quantity of described driving switch is two, be respectively the second driving switch of the second primary coil work described in the first driving switch of the first primary coil work described in conducting and conducting, described first driving switch and the second driving switch be the first primary coil and the second primary coil generation current according to described pwm signal alternate conduction.
4. adaptive low-noise DCDC insulating power supply as claimed in claim 3, it is characterized in that: described switching tube driver element also comprises inverter circuit, first primary coil described in described first driving switch foundation pwm signal conducting, the first primary coil described in the pwm signal conducting after described second driving switch is anti-phase according to described negative circuit.
5. adaptive low-noise DCDC insulating power supply as claimed in claim 2, it is characterized in that: described switching tube driver element also comprises delay circuit, the quantity of described delay circuit and the quantity Matching of described driving switch, described delay circuit in order to receive described pwm signal or anti-phase after pwm signal, driving switch work described in delayed rear drive.
6. adaptive low-noise DCDC insulating power supply as claimed in claim 5, is characterized in that: described delay circuit comprises NAND gate/AND circuit, described pwm signal or anti-phase after pwm signal input from the first input end of described NAND gate/AND circuit; Second input of described NAND gate/AND circuit is connect with reference to ground by electric capacity, and described pwm signal or anti-phase after the electric current of pwm signal reach this electric capacity, the output of described NAND gate/AND circuit connects corresponding described driving switch.
7. adaptive low-noise DCDC insulating power supply as claimed in claim 1, is characterized in that: described voltage attenuation unit feeds back to described control unit after adopting differential input voltage amplifier circuit to decay to the voltage gathered.
8. adaptive low-noise DCDC insulating power supply as claimed in claim 1, it is characterized in that: also comprise rectification unit, described rectification unit carries out rectification in order to respond to secondary coil the alternating current obtained.
9. adaptive low-noise DCDC insulating power supply as claimed in claim 8, it is characterized in that: described rectification unit comprises rectification driving chip and triode, the output of described rectification driving chip connects the control pole of described triode, described rectification driving chip controls described triode in order to respond to according to described secondary coil the alternating current obtained, thus after making the alternating current of described triode to the collector electrode reaching described triode from described secondary coil carry out rectification, exported by the emitter of described triode.
10. adaptive low-noise DCDC insulating power supply as claimed in claim 9, it is characterized in that: described secondary coil comprises first kind secondary coil and Equations of The Second Kind secondary coil, described first kind secondary coil inputs the described input of rectification driving chip and the collector electrode of triode after obtaining alternating current from described primary coil induction, and described Equations of The Second Kind secondary coil is powered for described rectification driving chip after obtaining alternating current from described primary coil induction.
11. adaptive low-noise DCDC insulating power supplies as claimed in claim 9, is characterized in that: the output of described rectification driving chip also passes through capacity earth.
12. adaptive low-noise DCDC insulating power supplies as claimed in claim 9, it is characterized in that: the quantity of described rectification driving chip and triode is two, the input of each described rectification driving chip connects a described secondary coil, the output of each described rectification driving chip connects a described triode, and two described triodes are controlled althyrex, output current.
13. adaptive low-noise DCDC insulating power supplies as claimed in claim 8, it is characterized in that: also comprise filter unit, described filter unit carries out filtering process in order to the direct current will received from described rectification unit.
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| CN109644167A (en) * | 2016-08-23 | 2019-04-16 | 株式会社电装 | Ring suppression circuit and ring suppressing method |
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