CN202940733U - Direct current insulation buck converter and matrix voltage detection circuit thereof - Google Patents
Direct current insulation buck converter and matrix voltage detection circuit thereof Download PDFInfo
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- CN202940733U CN202940733U CN 201220591486 CN201220591486U CN202940733U CN 202940733 U CN202940733 U CN 202940733U CN 201220591486 CN201220591486 CN 201220591486 CN 201220591486 U CN201220591486 U CN 201220591486U CN 202940733 U CN202940733 U CN 202940733U
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Abstract
The utility model discloses a direct current insulation buck converter. In the matrix voltage detection circuit of the direct current insulation buck converter, the detection of the matrix voltage of the direct current insulation buck converter is realized by detecting the secondary side voltage of an insulation converter, thus no extra insulation chip is needed for realizing the insulation of a high voltage and a low voltage, the circuit is simple, and the cost is low. According to the direct current insulation buck converter, the matrix voltage detection circuit of the direct current insulation buck converter can further be realized through a hardware circuit to just extract the peak voltage of a PWM (pulse width modulation) wave signal as a simulating signal, so that the voltage of a matrix on the high voltage side of direct current insulation buck conversion can be detected through a digital controlled circuit, and the voltage of the matrix on the high voltage side of the direct current insulation buck converter can be detected through a simulation type controlled circuit. The utility model further discloses a matrix voltage detection circuit of the direct current insulation buck converter.
Description
Technical field
The utility model relates to the DC power supply technology, particularly a kind of DC-isolation buck converter and busbar voltage testing circuit thereof.
Background technology
A uncontrolled input direct voltage is for conversion into to another controlled output dc voltage and is referred to as the DC/DC conversion.In electric automobile driving and regeneration brake system, DC/DC converter and motor driver are the mobile important steps of system capacity, and the DC/DC converter is that the DC voltage conversion that the direct voltage sources such as battery, direct current machine is fixing becomes in check direct voltage output.
Switching mode DC/DC isolated variable circuit is to adjust output voltage or maintain output voltage constant by the make-and-break time of periodic control switch device (power semiconductor) or break-make frequency, and fixing DC voltage conversion is become in check direct voltage output.Common switching mode DC/DC(DC-to-DC) the isolated variable circuit as shown in Figure 1, comprises voltage conversion circuit, isolation inverter circuit, rectifying output circuit; Voltage conversion circuit input termination direct voltage source Ud, control with shutoff the size that outputs to the direct voltage Ui that isolates inverter circuit for the switching device conducting by controlling wherein, thus the size of the output dc voltage Uo of control switch type DC converting (DC/DC) circuit; The output dc voltage Ui of the input termination voltage conversion circuit of isolation inverter circuit, become high-frequency ac voltage for the output dc voltage Ui by voltage conversion circuit and output to rectifying output circuit; Rectifying output circuit will be for isolating the high-frequency ac voltage rectification of inverter circuit output, output dc voltage Uo; Voltage conversion circuit has boost conversion circuit (Boost), step-down conversion circuit (Buck), buck translation circuit (Buck-Boost), Cook translation circuit (Cuk) etc. usually; Isolation inverter circuit commonly used has full-bridge type, semibridge system, push-pull type.From the angle of controlling, divide, the DC converter that adopts analog control circuit is analog DC converter, and adopting the DC converter of digital control circuit is the digital direct current converter.
Semibridge system isolation inverter circuit as shown in Figure 2, input direct voltage Ui, the first capacitor C 1, the second capacitor C 2 capacity equate and capacity enough large, the current potential that makes two electric capacity junctions is half of input direct voltage Ui, and respectively the voltage at these electric capacity two ends remains Ui/2 when circuit working, the drive control signal u of the 3rd switching device VT3
g3control the break-make of the 3rd switching device VT3, the drive control signal u of the 4th switching device VT4
g4control the break-make of the 4th switching device VT4, (in figure, two switching devices are field effect transistor for the 3rd switching device VT3, the 4th switching device VT4, also can adopt other power semiconductor switch) the break-make rule be: each switch periods is Ts, the first switch periods is only the 3rd switching device VT3 work, the 4th switching device VT4 remain off state, in the first switch periods, the conduction duration of the 3rd switching device VT3 is Ton, and the turn-off time is Toff, Ton+Toff=Ts; The second switch cycle is only the 4th switching device VT4 work, the 3rd switching device VT3 remain off state, the conduction duration of second switch the 4th switching device VT4 in the cycle is Ton, turn-off time is Toff, the 3rd switching device VT3, two switching device alternations of the 4th switching device VT4, during the 3rd switching device VT3 conducting, the voltage of primary winding is-Ui/2, and during the 4th switching device VT4 conducting, the voltage of primary winding is Ui/2.
Full-bridge type isolation inverter circuit as shown in Figure 3, that the first capacitor C 1, the second capacitor C 2 that semibridge system is isolated in inverter circuit replaces with the first switching device VT1, second switch device VT2, and be equipped with drive control signal, the drive control signal u of the first switching device VT1
g1, second switch device VT2 drive control signal u
g2, the 3rd switching device VT3 drive control signal u
g3, the 4th switching device VT4 drive control signal u
g4control respectively the break-make of respective switch device, (in figure, this four switching device is field effect transistor to this four switching device, also can adopt other power semiconductor switch) the break-make rule be: each switch periods is Ts, the first switch periods is only the 3rd switching device VT3, second switch device VT2 work, the 4th switching device VT4, the first switching device VT1 remain off state, in the first switch periods, the conduction duration of the 3rd switching device VT3, second switch device VT2 is Ton, turn-off time is Toff, Ton+Toff=Ts, the second switch cycle is only the 4th switching device VT4, the first switching device VT1 work, the 3rd switching device VT3, second switch device VT2 remain off state, second switch is the 4th switching device VT4 in the cycle, the conduction duration of the first switching device VT1 is Ton, turn-off time is Toff, the 3rd switching device VT3 and second switch device VT2, the 4th switching device VT4 and two groups of switching device alternations of the first switching device VT1, when the 3rd switching device VT3 and second switch device VT2 conducting, the voltage of primary winding is-Ui, when the 4th switching device VT4 and the first switching device VT1 conducting, the voltage of primary winding is Ui.
As shown in Figure 4, similar to semibridge system isolation inverter circuit is also to only have the 3rd switching device VT3, two switching devices of the 4th switching device VT4, the drive control signal u of the 3rd switching device VT3 to push-pull type isolation inverter circuit
g3control the break-make of the 3rd switching device VT3, the drive control signal u of the 4th switching device VT4
g4control the break-make of the 4th switching device VT4, (in figure, two switching devices are field effect transistor for the 3rd switching device VT3, the 4th switching device VT4, also can adopt other power semiconductor switch) the break-make rule be: each switch periods is Ts, the first switch periods is only the 3rd switching device VT3 work, the 4th switching device VT4 remain off state, in the first switch periods, the conduction duration of the 3rd switching device VT3 is Ton, and the turn-off time is Toff, Ton+Toff=Ts; The second switch cycle is only the 4th switching device VT4 work, the 3rd switching device VT3 remain off state, the conduction duration of second switch the 4th switching device VT4 in the cycle is Ton, turn-off time is Toff, the 3rd switching device VT3, two switching device alternations of the 4th switching device VT4, during the 3rd switching device VT3 conducting, electric current is just flowing into the upper end of primary winding from DC power supply, from primary winding centre cap, flows out; During the 3rd switching device VT3 conducting, electric current is just flowing into the lower end of primary winding from DC power supply, from primary winding centre cap, flows out.
In the electric/hybrid automobile, automobile-used DC/DC converter converts the voltage of high-tension battery (as 250V～430V) to the voltage (as 10V～16V) of A-battery, to the low-voltage load power supply, as on-board air conditioner, sound equipment, power windows etc.1.2kW above automobile-used DC/DC converter adopts full-bridge isolated topology structure usually, secondary is full-wave rectification, as shown in Figure 5, the high-tension battery anode meets the first switching tube Q1 by high voltage bus, the 3rd switching tube Q3, the high-tension battery negative terminal meets second switch pipe Q2 by ground wire, the 4th switching tube Q4, high voltage bus is with being connected to bus capacitor C between ground wire, the former limit of isolating transformer T winding is connected on the first switching tube Q1, the contact of second switch pipe Q2 and the 3rd switching tube Q3, between the contact of the 4th switching tube Q4, second switch pipe Q 2 within each cycle, the 3rd switching tube Q3 and the first switching tube Q1, the 4th switching tube Q4 alternate conduction, ON time is adjustable, the voltage that is added to the former limit of isolating transformer winding is the alternation square wave that amplitude is high-tension battery high pressure Ui.Meet respectively the 5th rectifier switch pipe Q5, the 6th rectifier switch pipe Q6 between the two ends of isolating transformer secondary winding and ground, the centre tap of isolating transformer secondary winding is concatenated into ground through the first inductance L 1, the first capacitor C 1, the first inductance L 1 is with the connection termination A-battery anode of the first capacitor C 1, the A-battery negativing ending grounding, the link of first capacitor C 1 same the first inductance L 1 is as the low-voltage output of Full-bridge isolated DC converter, and Uo is to A-battery for output low pressure.In circuit, the control circuit of each switching tube provides operating voltage by low pressure small-power accessory power supply, and the power of low pressure small-power accessory power supply is generally several watts to tens watts, and circuit topology can be normal shock, flyback etc.
The DC-isolation buck converter, need to be detected on high-tension side busbar voltage, with the control circuit chip for the DC-isolation buck converter, the operating state of DC-isolation buck converter adjusted.
The busbar voltage detection mode of common DC-isolation buck converter, directly in high-pressure side, by electric resistance partial pressure, to obtain, due to the control circuit chip operation in low-pressure side, must carry out high pressure and low pressure isolation from the car load security standpoint, in order to guarantee the isolation of high pressure and low pressure, the busbar voltage detection signal obtained by electric resistance partial pressure in high-pressure side need to pass through the AD(analog-to-digital conversion) chip, isolating chip is transferred to the control chip of low-pressure side, and need to increase the power supply to AD chip and isolating chip power supply, the busbar voltage detection mode of common DC-isolation buck converter, cost is higher, the circuit complexity.And, owing to high pressure (more than 300V) will being obtained to the voltage (common 0～5V) that the AD chip can gather by electric resistance partial pressure, need larger divider resistance, and the voltage ratio of resistance is larger, cause accuracy of detection to reduce, the response time is long.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of DC-isolation buck converter and busbar voltage testing circuit thereof, and circuit is simple, and cost is low.
For solving the problems of the technologies described above, the DC-isolation buck converter that the utility model provides, it comprises isolating transformer, rectification circuit, busbar voltage testing circuit;
Described isolating transformer, the upper/lower terminal of secondary winding connects respectively two inputs of described rectification circuit, and the centre tap of secondary winding is for connecing the anode of direct voltage output of DC-isolation buck converter;
Described rectification circuit, output is for connecing the negative terminal of direct voltage output of DC-isolation buck converter;
It is characterized in that,
Described busbar voltage testing circuit, comprise the first resistance, the second resistance, the first diode, the second diode, the 3rd resistance, the first electric capacity, first input end, the second input;
Described first input end, the second input, for the upper/lower terminal of the secondary winding of the isolating transformer that connects respectively the DC-isolation buck converter;
Described the first resistance, the first diode, be serially connected in described first input end between first node; The negative terminal of described the first diode is in the first node side, and anode is in described first input end side;
Described the second resistance, the second diode, be serially connected in described the second input between first node; The negative terminal of described the second diode is in the first node side, and anode is distolateral in described the second input;
Described the 3rd resistance, the first electric capacity, be connected in parallel on described first node between the ground of described busbar voltage testing circuit;
The ground of described busbar voltage testing circuit, for the negative terminal of the direct voltage output that connects the DC-isolation buck converter;
Described first node, detect the busbar voltage of DC-isolation buck converter for digital control circuit.
Preferably, described busbar voltage testing circuit, also comprise the 3rd diode, the second electric capacity, the 3rd electric capacity, the first comparator, the first transistor, the second nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance;
Described the 3rd diode, positive termination first node, negative terminal connects Section Point;
Described the second electric capacity, the 4th resistance, be connected in parallel on described Section Point between the ground of described busbar voltage testing circuit;
Described the 5th resistance, be connected on described Section Point between described the first comparator negative input end;
Described the 6th resistance, be connected on described first node between described the first comparator positive input terminal;
Described the 7th resistance, be connected on described the first comparator output terminal between first utmost point of described the first transistor;
Second utmost point of described the first transistor connects an end of an end of described the 8th resistance, described the 9th resistance and an end of described the 3rd electric capacity, and the 3rd utmost point of described the first transistor connects the ground of described busbar voltage testing circuit;
Described the first transistor is NPN triode or nmos switch pipe; The described first very base stage or nmos switch tube grid of NPN triode; The the described second very collector electrode of NPN triode or drain electrode of nmos switch pipe; The described the 3rd very emitter of NPN triode or the source electrode of nmos switch pipe;
Described the 3rd electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 8th resistance, another termination back work power supply;
Described the 9th resistance, the grid of described the second nmos switch pipe of another termination;
Described the second nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects an end of described the tenth resistance;
Described the tenth resistance, another termination Section Point;
Described Section Point, detect the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
Preferably, described busbar voltage testing circuit, also comprise the 4th voltage stabilizing didoe, the 5th voltage stabilizing didoe;
Described the 4th voltage stabilizing didoe is serially connected in described first input end between first node with the first resistance, the first diode, and the anode of described the 4th voltage stabilizing didoe is in the first node side, and negative terminal is in described first input end side;
Described the 5th voltage stabilizing didoe is serially connected in described the second input between first node with the second resistance, the second diode, and the anode of described the 5th voltage stabilizing didoe is in the first node side, and negative terminal is distolateral in described the second input.
Preferably, described busbar voltage testing circuit, also comprise the 11 resistance, the 4th electric capacity;
Described the 11 resistance, the described Section Point of a termination, described the 4th electric capacity one end of another termination;
Described the 4th electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 11 resistance is with the tie point of the 4th electric capacity, detects the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
Preferably, the DC-isolation buck converter, also comprise bus capacitor, the first nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe;
Described rectification circuit, comprise the 5th NMOS rectifier switch pipe, the 6th NMOS rectifier switch pipe;
Described bus capacitor, be connected on high-voltage side bus with between ground, high-pressure side;
The drain electrode of described the first nmos switch pipe, the 3rd nmos switch pipe connects high-voltage side bus;
The source electrode of described the second nmos switch pipe, the 4th nmos switch pipe connects ground, high-pressure side;
Described the first nmos switch pipe connects the lower end of the former limit of described isolating transformer winding with the tie point of the second nmos switch pipe;
The tie point of described the 3rd nmos switch Guan Tong tetra-nmos switch pipes connects the upper end of the former limit of described isolating transformer winding;
Described the 5th NMOS rectifier switch pipe, drain electrode connects the lower end of described isolating transformer secondary winding, and source electrode connects the negative terminal of the direct voltage output of DC-isolation buck converter;
Described the 6th NMOS rectifier switch pipe, drain electrode connects the upper end of described isolating transformer secondary winding, and source electrode connects the negative terminal of the direct voltage output of DC-isolation buck converter;
The grid of the first nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe, the 5th NMOS rectifier switch pipe and the 6th NMOS rectifier switch pipe connects respectively drive control signal separately;
Within each cycle, second switch pipe, the 3rd switching tube and the first switching tube, the 4th switching tube alternate conduction.
Preferably, between the source of the first nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe, leakage, be connected to respectively a diode, the source electrode of the positive termination nmos switch pipe of this diode, negative terminal connects the drain electrode of nmos switch pipe;
For solving the problems of the technologies described above, the busbar voltage testing circuit of the DC-isolation buck converter that the utility model provides, it comprises the first resistance, the second resistance, the first diode, the second diode, the 3rd resistance, the first electric capacity, first input end, the second input;
Described first input end, the second input, for the two ends of the secondary winding of the isolating transformer that connects respectively the DC-isolation buck converter;
Described the first resistance, the first diode, be serially connected in described first input end between first node; The negative terminal of described the first diode is in the first node side, and anode is in described first input end side;
Described the second resistance, the second diode, be serially connected in described the second input between first node; The negative terminal of described the second diode is in the first node side, and anode is distolateral in described the second input;
Described the 3rd resistance, the first Capacitance parallel connection arrive between the ground of described busbar voltage testing circuit at described first node;
The ground of described busbar voltage testing circuit, for the negative terminal of the direct voltage output that connects the DC-isolation buck converter;
Described first node, detect the busbar voltage of DC-isolation buck converter for digital control circuit.
Preferably, described busbar voltage testing circuit, also comprise the 3rd diode, the second electric capacity, the 3rd electric capacity, the first comparator, the first transistor, the second nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance;
Described the 3rd diode, positive termination first node, negative terminal connects Section Point;
Described the second electric capacity, the 4th resistance, be connected in parallel on described Section Point between the ground of described busbar voltage testing circuit;
Described the 5th resistance, be connected on described Section Point between described the first comparator negative input end;
Described the 6th resistance, be connected on described first node between described the first comparator positive input terminal;
Described the 7th resistance, be connected on described the first comparator output terminal between first utmost point of described the first transistor;
First utmost point of described the first transistor connects an end of an end of described the 8th resistance, described the 9th resistance and an end of described the 3rd electric capacity, and second utmost point of described the first transistor connects the ground of described busbar voltage testing circuit;
Described the 3rd electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 8th resistance, another termination back work power supply;
Described the 9th resistance, the grid of described the second nmos switch pipe of another termination;
Described the second nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects an end of described the tenth resistance;
Described the tenth resistance, another termination Section Point;
Described Section Point, detect the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
Preferably, described busbar voltage testing circuit, also comprise the 4th voltage stabilizing didoe, the 5th voltage stabilizing didoe;
Described the 4th voltage stabilizing didoe is serially connected in described first input end between first node with the first resistance, the first diode, and the anode of described the 4th voltage stabilizing didoe is in the first node side, and negative terminal is in described first input end side;
Described the 5th voltage stabilizing didoe is serially connected in described the second input between first node with the second resistance, the second diode, and the anode of described the 5th voltage stabilizing didoe is in the first node side, and negative terminal is distolateral in described the second input.
Preferably, described busbar voltage testing circuit, also comprise the 11 resistance, the 4th electric capacity;
Described the 11 resistance, the described Section Point of a termination, described the 4th electric capacity one end of another termination;
Described the 4th electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 11 resistance is with the tie point of the 4th electric capacity, detects the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
DC-isolation buck converter of the present utility model, its busbar voltage testing circuit is realized the detection of isolating transformer original edge voltage by the secondary voltage that detects isolating transformer, it is the detection of DC-isolation buck converter busbar voltage, and do not need extra isolating chip can realize the isolation of high pressure and low pressure, circuit is simple, and cost is low.DC-isolation buck converter of the present utility model, the peak point voltage that its busbar voltage testing circuit can also realize only extracting the PWM waveform signal by hardware circuit is analog signal, realize both can carrying out by digital control circuit the detection of DC-isolation buck converter high-voltage side bus voltage, also can carry out by analog control circuit the detection of DC-isolation buck converter high-voltage side bus voltage.
The accompanying drawing explanation
In order to be illustrated more clearly in the technical solution of the utility model, below the accompanying drawing of the required use of the utility model is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is common switching mode DC/DC isolated variable circuit diagram;
Fig. 2 is common semibridge system isolation inverter circuit figure;
Fig. 3 is common full-bridge type isolation inverter circuit figure;
Fig. 4 is common push-pull type isolation inverter circuit figure;
Fig. 5 is common automobile-used DC/DC converter circuit figure;
Fig. 6 is DC-isolation buck converter one embodiment schematic diagram of the present utility model;
Fig. 7 is the busbar voltage testing circuit first embodiment schematic diagram of DC-isolation buck converter of the present utility model;
Fig. 8 is the busbar voltage testing circuit second embodiment schematic diagram of DC-isolation buck converter of the present utility model;
Fig. 9 is the busbar voltage testing circuit second embodiment schematic diagram of DC-isolation buck converter of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme in the utility model is carried out to clear, complete description, obviously, described embodiment is a part of embodiment of the present utility model, rather than whole embodiment.Embodiment based in the utility model, all other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belong to the scope that the utility model is protected.
Embodiment mono-
The DC-isolation buck converter, as shown in Figure 6, comprise isolating transformer T, rectification circuit, busbar voltage testing circuit;
Described isolating transformer T, the upper/lower terminal of secondary winding connects respectively two inputs of described rectification circuit, and the centre tap of secondary winding is for connecing the anode of direct voltage output of DC-isolation buck converter;
Described rectification circuit, output is for connecing the negative terminal of direct voltage output of DC-isolation buck converter;
Described busbar voltage testing circuit, as shown in Figure 7, comprise the first resistance R 1, the second resistance R 2, the first diode D1, the second diode D 2, the 3rd resistance R 3, the first capacitor C 1, first input end 11, the second input 12;
Described first input end 11, the second input 12, for the upper/lower terminal of the secondary winding of the isolating transformer T that connects respectively the DC-isolation buck converter;
Described the first resistance R 1, the first diode D1, be serially connected in described first input end 11 between first node 13, and the negative terminal of described the first diode D1 is in first node 13 sides, and anode is in described first input end 11 sides;
Described the second resistance R 2, the second diode D2, be serially connected in described the second input 12 between first node 13, and the negative terminal of described the second diode D2 is in first node 13 sides, and anode is in described the second input 12 sides;
Described the 3rd resistance R 3, the first capacitor C 1, be connected in parallel on first node 13 between the ground of described busbar voltage testing circuit;
The ground of described busbar voltage testing circuit, for the negative terminal of the direct voltage output that connects the DC-isolation buck converter;
Described first node 13, detect DC-isolation decompression converter circuit high-voltage side bus voltage for digital control circuit.
The DC-isolation buck converter of embodiment mono-, by electric resistance partial pressure and diode rectification by the PWM(pulse width modulation of transformer secondary) the positive and negative AC signal of ripple signal is converted into unidirectional pwm pulse signal, because the on high-tension side busbar voltage of DC-isolation buck converter approximates on the former limit of transformation of isolating transformer T, the peak value of lower both end voltage, and on the transformation secondary, the peak value of lower two ends voltage over the ground is 2 times (transformer primary secondary no-load voltage ratio coefficient are k:1:1) of former limit peak value divided by transformer turn ratio, can realize the detection of the on high-tension side busbar voltage of DC-isolation buck converter so extract the transformer secondary by digital control circuit from first node 13 to the crest voltage of the PWM ripple of earth signal, do not need extra isolating chip can realize the isolation of high pressure and low pressure, circuit is simple, cost is low.
Embodiment bis-
Based on embodiment mono-, the busbar voltage testing circuit of DC-isolation buck converter, as shown in Figure 8, comprise the first resistance R 1, the second resistance R 2, the first diode D1, the second diode D 2, the 3rd resistance R 3, the first capacitor C 1; Also comprise the 3rd diode D3, the second capacitor C 2, the 3rd capacitor C 3, the first comparator A1, the first transistor (NPN triode or nmos switch pipe), the second nmos switch pipe, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10;
Described the first resistance R 1, the first diode D1, be serially connected in described first input end 11 between first node 13, and the negative terminal of described the first diode D1 is in first node 13 sides, and anode is in described first input end 11 sides;
Described the second resistance R 2, the second diode D2, be serially connected in described the second input 12 between first node 13, and the negative terminal of described the second diode D2 is in first node 13 sides, and anode is in described the second input 12 sides;
Described the 3rd resistance R 3, the first capacitor C 1, be connected in parallel on first node 13 between the ground of described busbar voltage testing circuit;
Described the 3rd diode D3, positive termination first node 13, negative terminal connects Section Point 14;
Described the second capacitor C 2, the 4th resistance R 4, be connected in parallel on described Section Point 14 between the ground of described busbar voltage testing circuit;
Described the 5th resistance R 5, be connected on described Section Point 14 between described the first comparator A1 negative input end;
Described the 6th resistance R 6, be connected on described first node 13 between described the first comparator A1 positive input terminal;
Described the 7th resistance R 7, be connected on described the first comparator A1 output between first utmost point (grid of the base stage of NPN triode or nmos switch pipe) of described the first transistor;
Second utmost point of described the first transistor (drain electrode of the collector electrode of NPN triode or nmos switch pipe) connects an end of an end of described the 8th resistance R 8, described the 9th resistance R 9 and an end of described the 3rd capacitor C 3, and emitter connects the ground of described busbar voltage testing circuit;
Described the 3rd capacitor C 3, the ground of the described busbar voltage testing circuit of another termination;
Described the 8th resistance R 8, another termination back work power Vcc (as 5V);
Described the 9th resistance R 9, the grid of described the second nmos switch pipe of another termination;
Described the second nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects an end of described the tenth resistance R 10;
Described the tenth resistance R 10, another termination Section Point 14;
Described Section Point, detect the high-voltage side bus voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
Because the two ends voltage over the ground of isolating transformer T secondary is that phase difference is the PWM waveform signal that 180 degree, duty ratio are less than 50%, this signal of direct-detection is higher to sampling request, by analog control circuit, can't detect.The busbar voltage testing circuit of the DC-isolation buck converter of embodiment bis-, realized only extracting the method for the peak point voltage of PWM waveform signal by hardware circuit, thereby realized both can detecting by digital control circuit the high-voltage side bus voltage of DC-isolation buck converter, also can detect by analog control circuit the high-voltage side bus voltage of DC-isolation buck converter.
In order to extract the crest voltage of the PWM ripple after rectification, the busbar voltage testing circuit of the DC-isolation buck converter of embodiment bis-, by unidirectional second capacitor C 2 of giving of the 3rd diode D3, charge, the pwm signal that the signal of the 3rd diode D3 anode is certain duty ratio, negative terminal is direct current signal, this direct current signal equals forward voltage drop poor of the crest voltage of the 3rd diode D3 anode and the 3rd diode D3, give the second capacitor C 2 chargings in the positive period of PWM ripple, and utilize the anti-phase cut-off characteristics of diode in negative cycle, the electric charge that guarantees the second capacitor C 2 is not released.While descending for the busbar voltage at the DC-isolation buck converter, the electric charge of the second capacitor C 2 is discharged, the 9th resistance R 9, the tenth resistance R 10 and the second nmos switch pipe form discharge loop, when the DC/DC bus descends, this loop is discharged the electric charge of the second capacitor C 2, when the voltage of the Section Point 14 connect when the second capacitor C 2 one ends and the pressure drop sum of the 3rd diode D3 equal the crest voltage of the first node 13 that the first capacitor C 1 one ends connect, this discharge loop is closed, the crest voltage of first node 13 voltages of the voltage follow of Section Point 14 the 3rd diode D3 changes.Rising and decline for the busbar voltage that detects the DC-isolation buck converter, the first comparator A1, the 5th resistance R 5 and the 6th resistance R 6 form busbar voltage lifting testing circuit, this circuit is realized by the voltage at real-time detection the 3rd diode D3 two ends, when busbar voltage raises, the forward voltage drop that the 3rd diode D3 anode crest voltage deducts the 3rd diode D3 is more than or equal to negative terminal voltage, the PWM ripple of the first comparator A1 output and the 3rd diode D3 anode same switch frequency and duty ratio, its amplitude determines (as 5V) by VCC, when busbar voltage descends, the forward voltage drop that the 3rd diode D3 anode crest voltage deducts the 3rd diode D3 is less than negative terminal voltage, the first comparator A1 output low level 0.The 7th resistance R 7, the 8th resistance R 8, the 3rd capacitor C 3 and a NPN diode form the PWM testing circuit, during the PWM ripple of the first comparator A1 output and the 3rd diode D3 anode same switch frequency and duty ratio, the forward voltage drop that the anode crest voltage that shows the 3rd diode D3 deducts the 3rd diode D3 is more than or equal to negative terminal voltage, now the first transistor is on off state, because the 3rd capacitor C 3 is discharged far faster than charging, the voltage of the 3rd electric capacity is that low level is (by adjusting the 8th resistance R 8, the value of the 3rd capacitor C 3 can guarantee that the 3rd capacitor C 3 both end voltage are lower than 0.5V), therefore the second nmos switch pipe in discharge loop is closed, Section Point 14 voltage follow first node 13 crest voltages raise and raise, when the first comparator A1 output low level, the forward voltage drop that the anode crest voltage that shows the 3rd diode D3 deducts the 3rd diode D3 is less than negative terminal voltage, now the first transistor cut-off, the 3rd capacitor C 3 both end voltage are charged as high level by the 8th resistance R 8 by working power (as 5V), the second nmos switch pipe in discharge loop is opened, Section Point 14 voltage follow first node 13 crest voltages reduce and reduce, realize that the 3rd diode D3 negative terminal voltage follows the peak change of positive terminal voltage in real time, thereby both can be applied in the DC-isolation buck converter of digital control circuit and realize the detection of the on high-tension side busbar voltage of DC-isolation buck converter by specific sampling policy from first node 13, also can be applied in the DC-isolation buck converter of analog control circuit and realize the detection of the on high-tension side busbar voltage of DC-isolation buck converter by analog circuit from described Section Point 14, do not need extra isolating chip can realize the isolation of high pressure and low pressure, circuit is simple, cost is low.
Embodiment tri-, and based on embodiment bis-, the busbar voltage testing circuit of DC-isolation buck converter, as shown in Figure 9, on the basis shown in Fig. 8, increase the 4th voltage stabilizing didoe D4, the 5th voltage stabilizing didoe D5, the 11 resistance R 11, the 4th capacitor C 4;
Described the 4th voltage stabilizing didoe D4 is serially connected in described first input end 11 between first node 13 with the first resistance R 1, the first diode D1, and the negative terminal of described the first diode D1 is in first node 13 sides, and anode is in described first input end 11 sides; The anode of described the 4th voltage stabilizing didoe D4 is in first node 13 sides, and negative terminal is in described first input end 11 sides;
Described the 5th voltage stabilizing didoe D5, the second resistance R 2, the second diode D2 are serially connected in described the second input 12 between first node 13, and the negative terminal of described the second diode D2 is in first node 13 sides, and anode is in described the second input 12 sides; The anode of described the 5th voltage stabilizing didoe D5 is in first node 13 sides, and negative terminal is in described first input end 12 sides;
Described the 11 resistance R 11, one termination Section Points 14, an end of described the 4th capacitor C 4 of another termination;
Described the 4th capacitor C 4, the ground of the described busbar voltage testing circuit of another termination;
Described the 11 resistance R 11 is with the tie point of described the 4th capacitor C 4, detects the high-voltage side bus voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
In embodiment tri-, by two inputs of the busbar voltage testing circuit at the DC-isolation buck converter, two voltage-stabiliser tubes of connecting respectively, for reducing the flow through quiescent current of busbar voltage testing circuit of A-battery.
Embodiment tetra-, based on embodiment mono-, two or three, the DC-isolation buck converter, as shown in Figure 6, comprise isolating transformer T, rectification circuit, busbar voltage testing circuit, also comprise bus capacitor C, the first nmos switch pipe Q1, the second nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch pipe Q4;
Described rectification circuit, comprise the 5th NMOS rectifier switch pipe Q5, the 6th NMOS rectifier switch pipe Q6;
Described bus capacitor, be connected on high-voltage side bus with between ground, high-pressure side;
The drain electrode of described the first nmos switch pipe Q1, the 3rd nmos switch pipe Q3 connects high-voltage side bus;
The source electrode of described the second nmos switch pipe Q2, the 4th nmos switch pipe Q4 connects ground, high-pressure side;
Described the first nmos switch pipe Q1 connects the lower end of the former limit of described isolating transformer T winding with the tie point of the second nmos switch pipe Q2;
Described the 3rd nmos switch pipe Q3 connects the upper end of the former limit of described isolating transformer T winding with the tie point of the 4th nmos switch pipe Q4;
Described the 5th NMOS rectifier switch pipe Q5, drain electrode connects the lower end of described isolating transformer T secondary winding, and source electrode connects the negative terminal of the direct voltage output of DC-isolation buck converter;
Described the 6th NMOS rectifier switch pipe Q6, drain electrode connects the upper end of described isolating transformer T secondary winding, and source electrode connects the negative terminal of the direct voltage output of DC-isolation buck converter;
The grid of the first nmos switch pipe Q1, the second nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch pipe Q4, the 5th NMOS rectifier switch pipe Q5 and the 6th NMOS rectifier switch pipe Q6 connects respectively drive control signal separately;
Within each cycle, second switch pipe Q2, the 3rd switching tube Q3 and the first switching tube Q1, the 4th switching tube Q4 alternate conduction, ON time is adjustable;
Be connected to respectively a diode between the source of the first nmos switch pipe Q1, the second nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch pipe Q4, leakage, the source electrode of the positive termination nmos switch pipe of this diode, negative terminal connects the drain electrode of nmos switch pipe;
The first nmos switch pipe Q1, the second nmos switch pipe Q2, the 3rd nmos switch pipe Q3, the 4th nmos switch pipe Q4, the 5th NMOS rectifier switch pipe Q5 and the 6th NMOS rectifier switch pipe Q6 source consubstantiality end short circuit separately.
The centre tap of isolating transformer secondary winding is through an inductance, a capacitance series to ground, and this inductance is the anode as the direct voltage output of this DC-isolation buck converter with the link of this electric capacity, and the output low-voltage DC is pressed onto A-battery.In circuit, the control circuit of each switching tube provides operating voltage by low pressure small-power back work power supply.
DC-isolation buck converter of the present utility model, its busbar voltage testing circuit is realized the detection of isolating transformer original edge voltage by the secondary voltage that detects isolating transformer, it is the detection of DC-isolation buck converter busbar voltage, and do not need extra isolating chip can realize the isolation of high pressure and low pressure, circuit is simple, and cost is low.DC-isolation buck converter of the present utility model, the peak point voltage that its busbar voltage testing circuit can also realize only extracting the PWM waveform signal by hardware circuit is analog signal, realize both can carrying out by digital control circuit the detection of DC-isolation buck converter high-voltage side bus voltage, also can carry out by analog control circuit the detection of DC-isolation buck converter high-voltage side bus voltage.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of the utility model protection.
Claims (10)
1. a DC-isolation buck converter, comprise isolating transformer, rectification circuit, busbar voltage testing circuit;
Described isolating transformer, the upper/lower terminal of secondary winding connects respectively two inputs of described rectification circuit, and the centre tap of secondary winding is for connecing the anode of direct voltage output of DC-isolation buck converter;
Described rectification circuit, output is for connecing the negative terminal of direct voltage output of DC-isolation buck converter;
It is characterized in that,
Described busbar voltage testing circuit, comprise the first resistance, the second resistance, the first diode, the second diode, the 3rd resistance, the first electric capacity, first input end, the second input;
Described first input end, the second input, for the upper/lower terminal of the secondary winding of the isolating transformer that connects respectively the DC-isolation buck converter;
Described the first resistance, the first diode, be serially connected in described first input end between first node; The negative terminal of described the first diode is in the first node side, and anode is in described first input end side;
Described the second resistance, the second diode, be serially connected in described the second input between first node; The negative terminal of described the second diode is in the first node side, and anode is distolateral in described the second input;
Described the 3rd resistance, the first electric capacity, be connected in parallel on described first node between the ground of described busbar voltage testing circuit;
The ground of described busbar voltage testing circuit, for the negative terminal of the direct voltage output that connects the DC-isolation buck converter;
Described first node, detect the busbar voltage of DC-isolation buck converter for digital control circuit.
2. DC-isolation buck converter according to claim 1, is characterized in that,
Described busbar voltage testing circuit, also comprise the 3rd diode, the second electric capacity, the 3rd electric capacity, the first comparator, the first transistor, the second nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance;
Described the 3rd diode, positive termination first node, negative terminal connects Section Point;
Described the second electric capacity, the 4th resistance, be connected in parallel on described Section Point between the ground of described busbar voltage testing circuit;
Described the 5th resistance, be connected on described Section Point between described the first comparator negative input end;
Described the 6th resistance, be connected on described first node between described the first comparator positive input terminal;
Described the 7th resistance, be connected on described the first comparator output terminal between first utmost point of described the first transistor;
Second utmost point of described the first transistor connects an end of an end of described the 8th resistance, described the 9th resistance and an end of described the 3rd electric capacity, and the 3rd utmost point of described the first transistor connects the ground of described busbar voltage testing circuit;
Described the first transistor is NPN triode or nmos switch pipe; The described first very base stage or nmos switch tube grid of NPN triode; The the described second very collector electrode of NPN triode or drain electrode of nmos switch pipe; The described the 3rd very emitter of NPN triode or the source electrode of nmos switch pipe;
Described the 3rd electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 8th resistance, another termination back work power supply;
Described the 9th resistance, the grid of described the second nmos switch pipe of another termination;
Described the second nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects an end of described the tenth resistance;
Described the tenth resistance, another termination Section Point;
Described Section Point, detect the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
3. DC-isolation buck converter according to claim 2, is characterized in that,
Described busbar voltage testing circuit, also comprise the 4th voltage stabilizing didoe, the 5th voltage stabilizing didoe;
Described the 4th voltage stabilizing didoe is serially connected in described first input end between first node with the first resistance, the first diode, and the anode of described the 4th voltage stabilizing didoe is in the first node side, and negative terminal is in described first input end side;
Described the 5th voltage stabilizing didoe is serially connected in described the second input between first node with the second resistance, the second diode, and the anode of described the 5th voltage stabilizing didoe is in the first node side, and negative terminal is distolateral in described the second input.
4. DC-isolation buck converter according to claim 3, is characterized in that,
Described busbar voltage testing circuit, also comprise the 11 resistance, the 4th electric capacity;
Described the 11 resistance, the described Section Point of a termination, described the 4th electric capacity one end of another termination;
Described the 4th electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 11 resistance is with the tie point of the 4th electric capacity, detects the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
5. according to the described DC-isolation buck converter of claim 1 to 4 any one, it is characterized in that,
The DC-isolation buck converter, also comprise bus capacitor, the first nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe;
Described rectification circuit, comprise the 5th NMOS rectifier switch pipe, the 6th NMOS rectifier switch pipe;
Described bus capacitor, be connected on high-voltage side bus with between ground, high-pressure side;
The drain electrode of described the first nmos switch pipe, the 3rd nmos switch pipe connects high-voltage side bus;
The source electrode of described the second nmos switch pipe, the 4th nmos switch pipe connects ground, high-pressure side;
Described the first nmos switch pipe connects the lower end of the former limit of described isolating transformer winding with the tie point of the second nmos switch pipe;
The tie point of described the 3rd nmos switch Guan Tong tetra-nmos switch pipes connects the upper end of the former limit of described isolating transformer winding;
Described the 5th NMOS rectifier switch pipe, drain electrode connects the lower end of described isolating transformer secondary winding, and source electrode connects the negative terminal of the direct voltage output of DC-isolation buck converter;
Described the 6th NMOS rectifier switch pipe, drain electrode connects the upper end of described isolating transformer secondary winding, and source electrode connects the negative terminal of the direct voltage output of DC-isolation buck converter;
The grid of the first nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe, the 5th NMOS rectifier switch pipe and the 6th NMOS rectifier switch pipe connects respectively drive control signal separately;
Within each cycle, second switch pipe, the 3rd switching tube and the first switching tube, the 4th switching tube alternate conduction.
6. DC-isolation buck converter according to claim 5, is characterized in that,
Be connected to respectively a diode between the source of the first nmos switch pipe, the second nmos switch pipe, the 3rd nmos switch pipe, the 4th nmos switch pipe, leakage, the source electrode of the positive termination nmos switch pipe of this diode, negative terminal connects the drain electrode of nmos switch pipe.
7. the busbar voltage testing circuit of a DC-isolation buck converter, is characterized in that,
Described busbar voltage testing circuit, comprise the first resistance, the second resistance, the first diode, the second diode, the 3rd resistance, the first electric capacity, first input end, the second input;
Described first input end, the second input, for the two ends of the secondary winding of the isolating transformer that connects respectively the DC-isolation buck converter;
Described the first resistance, the first diode, be serially connected in described first input end between first node; The negative terminal of described the first diode is in the first node side, and anode is in described first input end side;
Described the second resistance, the second diode, be serially connected in described the second input between first node; The negative terminal of described the second diode is in the first node side, and anode is distolateral in described the second input;
Described the 3rd resistance, the first Capacitance parallel connection arrive between the ground of described busbar voltage testing circuit at described first node;
The ground of described busbar voltage testing circuit, for the negative terminal of the direct voltage output that connects the DC-isolation buck converter;
Described first node, detect the busbar voltage of DC-isolation buck converter for digital control circuit.
8. the busbar voltage testing circuit of DC-isolation buck converter according to claim 7, is characterized in that,
Described busbar voltage testing circuit, also comprise the 3rd diode, the second electric capacity, the 3rd electric capacity, the first comparator, the first transistor, the second nmos switch pipe, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance;
Described the 3rd diode, positive termination first node, negative terminal connects Section Point;
Described the second electric capacity, the 4th resistance, be connected in parallel on described Section Point between the ground of described busbar voltage testing circuit;
Described the 5th resistance, be connected on described Section Point between described the first comparator negative input end;
Described the 6th resistance, be connected on described first node between described the first comparator positive input terminal;
Described the 7th resistance, be connected on described the first comparator output terminal between first utmost point of described the first transistor;
First utmost point of described the first transistor connects an end of an end of described the 8th resistance, described the 9th resistance and an end of described the 3rd electric capacity, and second utmost point of described the first transistor connects the ground of described busbar voltage testing circuit;
Described the 3rd electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 8th resistance, another termination back work power supply;
Described the 9th resistance, the grid of described the second nmos switch pipe of another termination;
Described the second nmos switch pipe, source electrode connects the ground of described busbar voltage testing circuit, and drain electrode connects an end of described the tenth resistance;
Described the tenth resistance, another termination Section Point;
Described Section Point, detect the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
9. the busbar voltage testing circuit of DC-isolation buck converter according to claim 8, is characterized in that,
Described busbar voltage testing circuit, also comprise the 4th voltage stabilizing didoe, the 5th voltage stabilizing didoe;
Described the 4th voltage stabilizing didoe is serially connected in described first input end between first node with the first resistance, the first diode, and the anode of described the 4th voltage stabilizing didoe is in the first node side, and negative terminal is in described first input end side;
Described the 5th voltage stabilizing didoe is serially connected in described the second input between first node with the second resistance, the second diode, and the anode of described the 5th voltage stabilizing didoe is in the first node side, and negative terminal is distolateral in described the second input.
10. the busbar voltage testing circuit of DC-isolation buck converter according to claim 9, is characterized in that,
Described busbar voltage testing circuit, also comprise the 11 resistance, the 4th electric capacity;
Described the 11 resistance, the described Section Point of a termination, described the 4th electric capacity one end of another termination;
Described the 4th electric capacity, the ground of the described busbar voltage testing circuit of another termination;
Described the 11 resistance is with the tie point of the 4th electric capacity, detects the busbar voltage of DC-isolation buck converter for analog control circuit or digital control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220591486 CN202940733U (en) | 2012-11-09 | 2012-11-09 | Direct current insulation buck converter and matrix voltage detection circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220591486 CN202940733U (en) | 2012-11-09 | 2012-11-09 | Direct current insulation buck converter and matrix voltage detection circuit thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946199A (en) * | 2012-11-09 | 2013-02-27 | 联合汽车电子有限公司 | Direct current insulation buck converter and matrix voltage detection circuit thereof |
| CN107431437A (en) * | 2015-03-09 | 2017-12-01 | 弗罗纽斯国际有限公司 | With the controlled resonant converter with centre tapped transformer |
| CN107431436A (en) * | 2015-03-09 | 2017-12-01 | 弗罗纽斯国际有限公司 | Measured with the circuit configuration with tapped transformer and output voltage |
| CN109541285A (en) * | 2018-12-26 | 2019-03-29 | 东莞市长工微电子有限公司 | BuckBoost circuit output current detection method and its detection circuit |
| CN113765414A (en) * | 2021-08-06 | 2021-12-07 | 苏州翌工电源科技有限公司 | Wide-output ACDC conversion circuit and control method |
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2012
- 2012-11-09 CN CN 201220591486 patent/CN202940733U/en not_active Withdrawn - After Issue
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946199A (en) * | 2012-11-09 | 2013-02-27 | 联合汽车电子有限公司 | Direct current insulation buck converter and matrix voltage detection circuit thereof |
| WO2014071674A1 (en) * | 2012-11-09 | 2014-05-15 | 联合汽车电子有限公司 | Direct-current isolation buck convertor and bus voltage detection circuit thereof |
| CN102946199B (en) * | 2012-11-09 | 2016-10-12 | 联合汽车电子有限公司 | DC-isolation buck converter and busbar voltage testing circuit thereof |
| CN107431437A (en) * | 2015-03-09 | 2017-12-01 | 弗罗纽斯国际有限公司 | With the controlled resonant converter with centre tapped transformer |
| CN107431436A (en) * | 2015-03-09 | 2017-12-01 | 弗罗纽斯国际有限公司 | Measured with the circuit configuration with tapped transformer and output voltage |
| US10379142B2 (en) | 2015-03-09 | 2019-08-13 | Fronius International Gmbh | Circuit assembly having a transformer with centre tapping and measuring of the output voltage |
| CN109541285A (en) * | 2018-12-26 | 2019-03-29 | 东莞市长工微电子有限公司 | BuckBoost circuit output current detection method and its detection circuit |
| CN109541285B (en) * | 2018-12-26 | 2020-12-08 | 东莞市长工微电子有限公司 | Buckboost circuit output current detection method and detection circuit thereof |
| CN113765414A (en) * | 2021-08-06 | 2021-12-07 | 苏州翌工电源科技有限公司 | Wide-output ACDC conversion circuit and control method |
| CN113765414B (en) * | 2021-08-06 | 2023-10-20 | 苏州翌工电源科技有限公司 | Wide-output ACDC conversion circuit and control method |
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