CN109660109A - A kind of adaptive zero cross detection circuit suitable for Switching Power Supply - Google Patents
A kind of adaptive zero cross detection circuit suitable for Switching Power Supply Download PDFInfo
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- CN109660109A CN109660109A CN201811473289.3A CN201811473289A CN109660109A CN 109660109 A CN109660109 A CN 109660109A CN 201811473289 A CN201811473289 A CN 201811473289A CN 109660109 A CN109660109 A CN 109660109A
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- zero
- backward counter
- signal
- crossing comparator
- offset voltage
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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
- H02M1/00—Details of apparatus for conversion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
Abstract
The invention discloses a kind of adaptive zero cross detection circuits suitable for Switching Power Supply, including forward-backward counter, offset voltage dynamic regulation circuit and zero-crossing comparator, forward-backward counter connects offset voltage dynamic regulation circuit, offset voltage dynamic regulation circuit connection zero-crossing comparator, the control terminal and forward-backward counter of zero-crossing comparator connection switch power supply, forward-backward counter is for carrying out plus-minus counting and output logic signal according to the zero passage detection signal that zero-crossing comparator exports；Offset voltage dynamic regulation circuit is used to receive the logical signal of forward-backward counter output and converts thereof into offset voltage；Zero-crossing comparator is used for the voltage of the common end of the power tube and synchronous rectifier according to Switching Power Supply and the size of the offset voltage of offset voltage dynamic regulation circuit output exports zero passage detection signal.The present invention can eliminate the influence that zero-crossing comparator lacks of proper care and is delayed at any time simultaneously, accurately detect the reverse current of Switching Power Supply.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of adaptive zero passage detection electricity suitable for Switching Power Supply
Road.
Background technique
For the transfer efficiency for improving Switching Power Supply, Switching Power Supply is generally used synchronous rectification structure, that is, uses synchronous rectification
Transistor replaces conventional diode to complete inductive current rectification.But when output loading is smaller, inductive current can reversely cause energy
Amount loss, for this reason, it may be necessary to the reverse current of zero cross detection circuit detection synchronous rectification transistor.When zero cross detection circuit detects
When synchronous rectification tube current is reversed, zero cross detection circuit will issue signal shutdown synchronous rectification transistor to prevent electric current reversed.
But influenced by semiconductor fabrication process deviation, environment temperature, operating voltage, there are random inputs for zero cross detection circuit
Offset voltage and delay, cause zero cross detection circuit detect reverse current to issue signal shutdown synchronous rectification transistor when
Between inaccuracy: (1) when the synchronous rectification transistor turn-off time is too early, inductive current rely on synchronous rectification transistor body diode
Afterflow generates biggish body diode losses；(2) when the synchronous rectification transistor turn-off time too late when, inductive current is reversed,
It will lead to loss to increase；Meanwhile there is very big ringing voltage in the common end (SW) of power tube and synchronous rectification transistor, increases
The voltage stress of transistor, inductance exacerbates power tube loss, and introduces EMI problem；Therefore accurate zero passage detection is needed
Circuit turns off synchronous rectification transistor in time to reduce power loss, stresses of parts and EMI problem.
In current application, the direction of Switching Power Supply towards high voltagehigh frequency high current is developed.In high-voltage applications, inductance electricity
The rate of change of stream faster, puts forward higher requirements the reaction speed of zero cross detection circuit；In frequency applications, switch periods
It shortens, and zero cross detection circuit also needs the additional blanking time, equally the reaction speed of zero cross detection circuit is proposed more
High requirement；In high current application, the body diode losses and inductive current of asynchronous regime are reversed, reduce converter
Efficiency, to the precision of zero cross detection circuit, more stringent requirements are proposed.
The prior art by amplifying common end (SW) voltage of power tube and synchronous rectification transistor according to a certain percentage
It is followed by increasing zero passage detection precision to zero cross detection circuit input terminal or the delay of adjusting zero cross detection circuit output signal.Wherein
Common end (SW) voltage of power tube and synchronous rectification transistor is amplified according to a certain percentage and is followed by zero-crossing comparator input
End reduces only the influence that zero cross detection circuit is delayed to zero passage detection precision, can accelerate the reaction speed of zero cross detection circuit
Degree, but the influence of zero cross detection circuit imbalance can not be eliminated；The delay of zero cross detection circuit output signal is adjusted to increase zero passage
Detection accuracy, can reduce the influence of zero cross detection circuit imbalance to a certain extent, but can not reduce zero cross detection circuit sheet
The influence of body delay.Therefore, the prior art can not eliminate the influence of zero cross detection circuit imbalance and delay simultaneously, cannot obtain essence
True zero cross detection circuit can not be applied in the design of high voltagehigh frequency high current.
The disclosure of background above technology contents is only used for auxiliary and understands design and technical solution of the invention, not necessarily
The prior art for belonging to present patent application, no tangible proof show above content present patent application the applying date
In disclosed situation, above-mentioned background technique should not be taken to the novelty and creativeness of evaluation the application.
Summary of the invention
In order to solve the above technical problems, the present invention proposes a kind of adaptive zero cross detection circuit suitable for Switching Power Supply,
The influence that zero-crossing comparator lacks of proper care and is delayed at any time can be eliminated simultaneously, accurately detect the reverse current of Switching Power Supply.
In order to achieve the above object, the invention adopts the following technical scheme:
The invention discloses a kind of adaptive zero cross detection circuits suitable for Switching Power Supply, and the Switching Power Supply includes function
Rate pipe and synchronous rectifier, the adaptive zero cross detection circuit include forward-backward counter, offset voltage dynamic regulation circuit and
Zero-crossing comparator, the output end of the forward-backward counter connect the input terminal of the offset voltage dynamic regulation circuit, the mistake
The output end of voltage dynamic regulation circuit is adjusted to connect the input terminal of the zero-crossing comparator, the output end of the zero-crossing comparator connects
Connect the control terminal of the Switching Power Supply and the input terminal of the forward-backward counter, in which: the forward-backward counter is used for according to institute
The zero passage detection signal of zero-crossing comparator output is stated to carry out plus-minus counting and output logic signal；The offset voltage dynamic is adjusted
Economize on electricity road is used to receive the logical signal of the forward-backward counter output and converts thereof into offset voltage；The zero passage ratio
The voltage and offset voltage dynamic regulation electricity according to the common end of the power tube and the synchronous rectifier are used for compared with device
The size of the offset voltage of road output exports the zero passage detection signal.
Preferably, the positive input of the zero-crossing comparator connects the public of the power tube and the synchronous rectifier
End, negative input connect the output end of the offset voltage dynamic regulation circuit；So that zero-crossing comparator can both acquire
The voltage of the common end of power tube and synchronous rectifier, and the imbalance electricity of offset voltage dynamic regulation circuit output can be acquired
Pressure.
Preferably, when the synchronous rectification tube current is reversed, the forward end voltage of the zero-crossing comparator is greater than negative sense
Voltage is held, the zero passage detection signal is high level；When the synchronous rectification tube current forward direction, the zero-crossing comparator is just
It is less than negative end voltage to end voltage, the zero passage detection signal is low level；By output high level or low level, to plus-minus
The input signal of counter offer plus-minus counting.
Preferably, the offset voltage dynamic regulation circuit uses D/A converting circuit；Forward-backward counter to be exported
The code value of logical signal be converted into the offset voltage of zero-crossing comparator negative end.
Preferably, the adaptive zero cross detection circuit further includes phase inverter and d type flip flop, the phase inverter and the D
Trigger is connected between the output end of the zero-crossing comparator and the input terminal of the forward-backward counter, the phase inverter it is defeated
Enter the output end that end connects the zero-crossing comparator, the output end of the phase inverter connects clock end and the institute of the d type flip flop
The control terminal of Switching Power Supply is stated, the positive output end of the d type flip flop connects the input terminal of the forward-backward counter；Pass through reverse phase
The zero passage detection signal that zero-crossing comparator exports is converted into the letter that forward-backward counter can be acquired and be applied by device and d type flip flop
Number.
Preferably, when the zero passage detection signal of zero-crossing comparator output is high level, the d type flip flop
The output signal of positive output end remains unchanged；When the zero passage detection signal of zero-crossing comparator output is low level
When, the output signal of the positive output end of the d type flip flop is set to 1 in the rising edge of the output signal of the phase inverter；It is logical
It crosses output signal and remains unchanged or be set to 1, so that forward-backward counter is corresponding to execute plus-minus counting.
Preferably, the forward-backward counter samples the positive output end of the d type flip flop in the rising edge of its clock signal
Output signal, when the output signal of the positive output end of the d type flip flop be low level when, the forward-backward counter subtracts 1；When
When the output signal of the positive output end of the d type flip flop is high level, the forward-backward counter adds 1；It is by output signal
Low level or high level, so that forward-backward counter subtracts 1 or adds 1, thus may further output logic signal.
Preferably, the holding control signal end of the forward-backward counter receives the control signal of the Switching Power Supply to control
The forward-backward counter carries out the effective time of plus-minus processing, when the holding control signal of the forward-backward counter is high level
When, the forward-backward counter is operated without plus-minus；It is described when the holding of forward-backward counter control signal is low level
Forward-backward counter carries out plus-minus operation；The effective time that forward-backward counter carries out plus-minus processing is effectively controlled by this step, is mentioned
The computational efficiency of the high adaptive zero cross detection circuit.
Compared with prior art, the beneficial effects of the present invention are: the present invention is detected using adaptive zero cross detection circuit
The reverse current of Switching Power Supply utilizes forward-backward counter and imbalance by the voltage of the common end of power tube and synchronous rectifier
Voltage dynamic regulation circuit, is adaptively adjusted zero cross detection circuit precision, can reduce simultaneously zero cross detection circuit imbalance and
The influence being delayed to zero passage detection precision, accurately detects the reverse current of Switching Power Supply, meets answering for high voltagehigh frequency high current
With demand, meanwhile, reducing transducer loss, EMI, transistor stress etc. influences.
Detailed description of the invention
Fig. 1 is the adjusting and voltage-reduction switch power supply structure block diagram with reverse current detection；
Fig. 2 is the functional block diagram of the adaptive zero cross detection circuit of the preferred embodiment of the present invention；
Fig. 3 is the logic timing figure of the adaptive zero cross detection circuit of the preferred embodiment of the present invention.
Specific embodiment
Below against attached drawing and in conjunction with preferred embodiment, the invention will be further described.
The power supply structure block diagram of adjusting and voltage-reduction switch power supply with reverse current detection as shown in Figure 1, is that the present invention is excellent
The adaptive zero cross detection circuit of embodiment is selected to be applicable in scene, wherein the Switching Power Supply includes power tube HSPMOS, synchronous rectification
Pipe LSNMOS, the first phase inverter 101, loop control logic circuit 102, loop impulse width modulated comparator PWM, loop error
Amplifier circuit EA, internal oscillator circuit osc, first with door 103, second and door 104, the first NAND gate 105, second with it is non-
The common end of door 106 and adaptive zero cross detection circuit 200, power tube HSPMOS and synchronous rectifier LSNMOS are the end SW,
The other end of connection switch power adapter output voltage Vout at the end SW, power tube HSPMOS connect input voltage signal Vin,
The other end connection of synchronous rectifier LSNMOS refers to ground voltage GND；The driving signal HSDRV connection first of power tube HSPMOS
The output end of phase inverter 101, the input terminal linkloop control logic circuit 102 of the first phase inverter 101, loop control logic electricity
Output end (the ring of loop impulse width modulated comparator PWM output of 102 linkloop pwm comparator PWM of road
Road pulse width modulating signal PWM is input to the first phase inverter 101 by loop control logic circuit 102), loop impulse width
The output end of the forward end linkloop error amplifier circuit EA of comparator PWM is modulated, negative end connects internal oscillator electricity
Road osc, internal oscillator circuit osc, which receive loop switch frequency signal clk and generate ramp signal Vramp and export, gives loop control
The negative end of logic circuit 102 processed；The forward end of loop error amplifier circuit EA connects internal reference voltage Vref, negative end
The partial pressure feedback signal Vfb of connection switch power adapter output voltage, partial pressure feedback signal Vfb pass through switch power converter
Output voltage Vout and connection are generated with reference to ground voltage GND；The driving signal LSDRV connection first of synchronous rectifier LSNMOS with
The output end of door 103, first connect the output end of the first phase inverter 101, the connection of the second input terminal with the first input end of door 103
The output end of second NAND gate 106, the output end of first input end the first NAND gate 105 of connection of the second NAND gate 106, second
The first input end of the output end of input terminal connection second and door 104, the first NAND gate 105 connects the defeated of the first phase inverter 101
Outlet, the second input terminal connect the output end of the second NAND gate 106, and second connect adaptive mistake with the first input end of door 104
Zero detection circuit 200, the second input terminal connect the driving signal HSDRV of power tube HSPMOS.
As shown in Fig. 2, the adaptive zero cross detection circuit 200 of the preferred embodiment of the present invention includes zero-crossing comparator 201, loses
Voltage dynamic regulation circuit 202, forward-backward counter 203, the second phase inverter 204 and d type flip flop 205 are adjusted, zero-crossing comparator 201
Output end connects the input terminal of the second phase inverter 204, and forward end connects the end SW, and negative end connects offset voltage dynamic regulation circuit
202 output end, the output end of the input terminal connection forward-backward counter 203 of offset voltage dynamic regulation circuit 202, plus-minus counting
Device 203 input terminal connection d type flip flop 205 positive output end, the second reverser 204 output end connection d type flip flop when
Zhong Duan, the input terminal of d type flip flop 205 connect internal logic high level VDD, the driving signal of resetting end connection power tube HSPMOS
HSDRV (the driving signal HSDRV of power tube HSPMOS periodically resets 205 output signal U D of d type flip flop).In addition it adds and subtracts
The holding control end signal Hold of counter 203 connects the output end of the first NAND gate 105 simultaneously.
The working principle of the adaptive zero cross detection circuit 200 of the preferred embodiment of the present invention are as follows: zero-crossing comparator 201 is born
To the output end of end connection offset voltage dynamic regulation circuit 202, the dynamic regulation voltage of negative end is to fold on the basis of GND
The offset voltage Voff for adding offset voltage dynamic regulation circuit 202 to export；When synchronous rectifier LSNMOS electric current is reversed, zero passage
201 forward end voltage of comparator is higher than negative end voltage, and zero-crossing comparator 201 exports high level, the positive output end of d type flip flop
Output signal U D remain unchanged；When synchronous rectifier LSNMOS electric current forward direction, 201 forward end voltage of zero-crossing comparator is lower than
Negative end voltage, zero-crossing comparator 201 export low level, in output signal zcd (namely the Zero-cross comparator of the second phase inverter 204
Effective output signal that 201 output signal of device obtains after the second phase inverter 204) rising edge by d type flip flop forward direction it is defeated
The output signal U D of outlet, which is set to 1, UD, becomes logic high.Forward-backward counter 203 realizes plus-minus counting, changes logical signal
The code value of D0~D7；203 clock signal udclk rising edge of forward-backward counter samples the output letter of the positive output end of d type flip flop
The voltage of number UD, when udclk rising edge sampling UD is low level, forward-backward counter 203 subtracts 1, conversely, when udclk rising edge is adopted
Sample UD is high level, forward-backward counter 203 plus 1.The holding control signal Hold of forward-backward counter 203 controls forward-backward counter
203 effective time, when Hold is high level, forward-backward counter 203 is operated without plus-minus, output logic signal D0~D7
Code value remain unchanged, when Hold be low level when, forward-backward counter 203 is according to clock signal udclk rising edge sampled signal
Carry out plus-minus counting.Offset voltage dynamic regulation circuit 202 uses digital analog converter, to export forward-backward counter 203
The code value of logical signal D0~D7 is converted into the offset voltage Voff of 201 negative end of zero-crossing comparator, when forward-backward counter 203 is defeated
When the code value of logical signal D0~D7 out increases, offset voltage Voff increases, when the logical signal that forward-backward counter 203 exports
When the code value of D0~D7 reduces, offset voltage Voff reduces；And pass through zero-crossing comparator 201, offset voltage dynamic regulation circuit
The mutual automatic adjusument of signal between 202 and forward-backward counter 203 is until obtaining accurate zero passage detection signal.
As shown in figure 3, be the main signal timing diagram of the adaptive zero cross detection circuit of the preferred embodiment of the present invention, when by
The imbalance of zero-crossing comparator 201 and delay, when inductive current IL does not drop to zero also, effective output of zero-crossing comparator 201 is believed
Number zcd is lower by height, and it is reversed that instruction has an inductive current IL at this time, turns off synchronous rectifier LSNMOS, inductive current IL is logical
The body diode afterflow of synchronous rectifier LSNMOS is crossed, the voltage at the end SW is about -0.7V, and zcd is got higher by low again, d type flip flop
The output signal U D of positive output end, which is set to 1, UD, becomes logic high；Meanwhile the holding of forward-backward counter 203 controls letter
Number Hold is lower by height, and forward-backward counter 203 is no longer kept；The clock signal udclk rising edge of forward-backward counter 203 samples UD
For high level, forward-backward counter 203 exports code value D0~D7 and adds 1, and code value D0~D7 passes through offset voltage dynamic regulation circuit 202
Afterwards, increase zero-crossing comparator negative end offset voltage Voff.After inductive current IL drops to zero, the voltage at the end SW is by -0.7V
Output voltage Vout is risen to, effective output signal zcd of zero-crossing comparator is lower by height again.This process is continued for, by
Cumulative big Voff is until obtaining accurate reverse current detection.When inductive current IL has been reduced to negative value, zero-crossing comparator 201
Effective output signal zcd is lower by height, and it is reversed that instruction has an inductive current IL at this time, turns off synchronous rectifier LSNMOS；This
When, the voltage at the end SW can rise rapidly, and zcd remains low level, and UD signal remains low level, forward-backward counter 203 when
It is low level that clock signal udclk rising edge, which samples UD, and forward-backward counter 203 exports code value D0~D7 and subtracts 1, and code value D0~D7 passes through
After offset voltage dynamic regulation circuit 202, reduce zero-crossing comparator negative end offset voltage Voff.This process is continued for,
Voff is gradually reduced until obtaining accurate reverse current detection.So far, the adaptive zero passage detection of the preferred embodiment of the present invention
Circuit realizes while eliminating the influence that zero-crossing comparator lacks of proper care and is delayed at random, accurately detects the reversed electricity of Switching Power Supply
Stream.
The adaptive zero cross detection circuit of the preferred embodiment of the present invention is within the temperature range of -40~125 DEG C, input voltage
Range is 4~14V, and output voltage range is 3~4.5V, is verified by all process corner Transients, can be obtained accurate
Reverse current detection.
Above preferred embodiment is wherein this hair by taking adaptive zero cross detection circuit is applied to adjusting and voltage-reduction switch power supply as an example
The adaptive zero cross detection circuit of bright preferred embodiment is applied equally to step-up switching power supply and buck-boost type switch electricity
Source, working principle is as above-mentioned, and details are not described herein.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those skilled in the art to which the present invention belongs, it is not taking off
Under the premise of from present inventive concept, several equivalent substitute or obvious modifications can also be made, and performance or use is identical, all answered
When being considered as belonging to protection scope of the present invention.
Claims (8)
1. a kind of adaptive zero cross detection circuit suitable for Switching Power Supply, the Switching Power Supply includes power tube and synchronous rectification
Pipe, which is characterized in that the adaptive zero cross detection circuit includes forward-backward counter, offset voltage dynamic regulation circuit and zero passage
Comparator, the output end of the forward-backward counter connect the input terminal of the offset voltage dynamic regulation circuit, the imbalance electricity
The output end of pressure dynamic regulation circuit connects the input terminal of the zero-crossing comparator, and the output end of the zero-crossing comparator connects institute
State the control terminal of Switching Power Supply and the input terminal of the forward-backward counter, in which:
The forward-backward counter is for carrying out plus-minus counting and defeated according to the zero passage detection signal that the zero-crossing comparator exports
Logical signal out；
The offset voltage dynamic regulation circuit is used to receive the logical signal of forward-backward counter output and by its turn
Change offset voltage into；
The zero-crossing comparator is used for voltage and the imbalance according to the common end of the power tube and the synchronous rectifier
The size of the offset voltage of voltage dynamic regulation circuit output exports the zero passage detection signal.
2. adaptive zero cross detection circuit according to claim 1, which is characterized in that the forward direction of the zero-crossing comparator is defeated
Enter the common end that end connects the power tube and the synchronous rectifier, negative input connects the offset voltage dynamic regulation
The output end of circuit.
3. adaptive zero cross detection circuit according to claim 2, which is characterized in that when the synchronous rectification tube current is anti-
Xiang Shi, the forward end voltage of the zero-crossing comparator are greater than negative end voltage, and the zero passage detection signal is high level；When described
When synchronous rectification tube current forward direction, the forward end voltage of the zero-crossing comparator is less than negative end voltage, the zero passage detection letter
Number be low level.
4. adaptive zero cross detection circuit according to claim 1, which is characterized in that the offset voltage dynamic regulation electricity
Road uses D/A converting circuit.
5. adaptive zero cross detection circuit according to claim 1, which is characterized in that it further include phase inverter and d type flip flop,
The phase inverter and the d type flip flop be connected to the zero-crossing comparator output end and the forward-backward counter input terminal it
Between, the input terminal of the phase inverter connects the output end of the zero-crossing comparator, and the output end of the phase inverter connects the D touching
The clock end of device and the control terminal of the Switching Power Supply are sent out, the positive output end of the d type flip flop connects the forward-backward counter
Input terminal.
6. adaptive zero cross detection circuit according to claim 5, which is characterized in that when zero-crossing comparator output
When the zero passage detection signal is high level, the output signal of the positive output end of the d type flip flop is remained unchanged；When the mistake
When the zero passage detection signal of zero comparator output is low level, the rising edge of the output signal of the phase inverter will be described
The output signal of the positive output end of d type flip flop is set to 1.
7. adaptive zero cross detection circuit according to claim 5, which is characterized in that the forward-backward counter is in its clock
The rising edge of signal samples the output signal of the positive output end of the d type flip flop, when the positive output end of the d type flip flop
When output signal is low level, the forward-backward counter subtracts 1；When the output signal of the positive output end of the d type flip flop is height
When level, the forward-backward counter adds 1.
8. adaptive zero cross detection circuit according to any one of claims 1 to 7, which is characterized in that the plus-minus counting
The control signal that the holding control signal end of device receives the Switching Power Supply carries out plus-minus processing to control the forward-backward counter
Effective time, when the forward-backward counter holding control signal be high level when, the forward-backward counter without plus-minus
Operation；When the holding of forward-backward counter control signal is low level, the forward-backward counter carries out plus-minus operation.
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| CN201811473289.3A CN109660109B (en) | 2018-12-04 | 2018-12-04 | Self-adaptive zero-crossing detection circuit suitable for switching power supply |
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| CN201811473289.3A CN109660109B (en) | 2018-12-04 | 2018-12-04 | Self-adaptive zero-crossing detection circuit suitable for switching power supply |
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| CN114137463A (en) * | 2020-10-12 | 2022-03-04 | 上海富芮坤微电子有限公司 | Automatic calibration device and calibration method for zero-crossing detection circuit of switching power supply |
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| CN114137463A (en) * | 2020-10-12 | 2022-03-04 | 上海富芮坤微电子有限公司 | Automatic calibration device and calibration method for zero-crossing detection circuit of switching power supply |
| CN114137463B (en) * | 2020-10-12 | 2024-03-19 | 上海富芮坤微电子有限公司 | Automatic calibration device and calibration method for zero crossing point detection circuit of switching power supply |
| CN115436689A (en) * | 2022-09-23 | 2022-12-06 | 陕西省电子技术研究所有限公司 | Electricity zero position testing arrangement based on two fortune are put and hall current sensor |
| CN115436689B (en) * | 2022-09-23 | 2023-09-01 | 陕西省电子技术研究所有限公司 | Null position testing device based on double operational amplifiers and Hall current sensors |
| CN117491724A (en) * | 2024-01-02 | 2024-02-02 | 江苏展芯半导体技术有限公司 | Inductance current zero-crossing detection method and circuit |
| CN117491724B (en) * | 2024-01-02 | 2024-04-05 | 江苏展芯半导体技术股份有限公司 | Inductance current zero-crossing detection method and circuit |
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