WO2011127686A1 - 多输入比较器和电源转换电路 - Google Patents
多输入比较器和电源转换电路 Download PDFInfo
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- WO2011127686A1 WO2011127686A1 PCT/CN2010/074166 CN2010074166W WO2011127686A1 WO 2011127686 A1 WO2011127686 A1 WO 2011127686A1 CN 2010074166 W CN2010074166 W CN 2010074166W WO 2011127686 A1 WO2011127686 A1 WO 2011127686A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
- H03K5/2472—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using field effect transistors
- H03K5/2481—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using field effect transistors with at least one differential stage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Definitions
- the present invention relates to the field of circuits, and more particularly to a multi-input comparator and a power conversion circuit. Background technique
- FIG. 1 is a schematic diagram of a comparison principle of a PWM comparator, wherein EAO is an error amplification signal output by an error amplifier (Error Amplifier), Ramp For the sawtooth wave or triangle wave signal, please refer to Figure 1.
- the PWM comparator is used to compare the error amplification signal EAO with the triangular wave signal Ramp to generate and output the pulse width modulation signal PWMO.
- the pulse The wide modulation signal PWMO is at a high level; when the error amplification signal EAO is smaller than the triangular wave signal Ramp signal, the pulse width modulation signal PWMO is at a low level. That is, the output of the PWM comparator is equal to the triangular wave signal at the error amplification signal EAO. Flip when Ramp.
- the pulse width modulation system can generate the pulse width modulation signal PWMO of different pulse widths by the error amplification signal EAO signal, which is the principle of pulse width modulation. It can be seen from Fig. 1 that when the error amplification signal EAO rises, the time when the pulse width modulation signal PWMO is at a high level increases, that is, the duty ratio increases; when the error amplification signal EAO decreases, the pulse width modulation signal PWMO The time that is high is reduced, that is, the duty cycle is reduced. For various DC-DC converters, DC-AC converters and AC-DC converters, it is usually necessary to adjust the power device through a feedback loop. Duty cycle. If the frequency of the triangular wave signal Ramp is fixed, the modulation of the pulse width corresponds to the modulation of the duty cycle.
- Ramp is generally generated by an oscillator.
- a commonly used oscillator generally outputs a sawtooth wave as shown in Fig. 1.
- the sawtooth wave has a valley voltage of zero volts.
- the duty cycle required for the loop steady state is equal to VO/VIN, and VO is the output of the DC-DC converter.
- Voltage, VIN is the input voltage of the DC-DC converter. When the input voltage VIN is large and the output voltage VO is small, the required duty cycle is small.
- the sawtooth wave signal Ramp is usually raised by a certain level ⁇ ⁇
- FIG. 2 shows two sawtooth wave signals before and after the voltage boost, where Rampl is the sawtooth wave signal before the boost, and Ramp2 is the boosted sawtooth wave signal.
- ⁇ ⁇ is the boosting amplitude voltage.
- Figure 3 is a circuit diagram of a conventional boost sawtooth signal Ramp.
- the circuit includes an operational amplifier ⁇ 1, an oscillator, resistors R1 and R2, PMOS transistors MP1, MP2 and MP3, and NMOS transistors MN1, MN2 and MN3.
- the oscillator generates a sawtooth wave signal Rampl before the voltage is boosted, and the intermediate node of the resistor R2 and the PMOS transistor is an output terminal for outputting the sawtooth wave signal Ramp2 after the voltage is boosted.
- the connection relationship of each electrical device is shown in FIG. , the description will not be repeated here.
- Ramp2 will increase the voltage of V1 R2/R1) compared to Rampl.
- this circuit design is not only complicated, but is also limited by the response speed of the op amp OP1.
- Figure 4 is a circuit diagram of the conventional current mode implementation of the error amplifier output signal EAO minus the current sampling signal ISEN, and then compared with the boosted sawtooth signal RampSH to generate a pulse width modulation signal PWMO, which is the second method described above.
- the circuit includes an operational amplifier OP2, an oscillator, a boost circuit, resistors R3 and R4, a PMOS transistor MP11, an MP12, an NMOS transistor MN11, a current sampling current source, and a PWM comparator, wherein R3 is equal to R4.
- the connection relationship of each electrical device is shown in Figure 4, and will not be repeated here.
- the sawtooth signal Ramp is boosted to RampSH, the error amplified signal EAO minus the current sampling signal ISEN obtains the output voltage EAO_ISEN, and the PWM comparator compares EAOJSEN and RampSH to generate the pulse width modulation signal PWMO.
- this design is not only complicated, but also limited by the op amp's response speed.
- Another object of the present invention is to provide a power conversion circuit that employs a multi-input comparator having a current input.
- a multi-input comparator includes: a first differential transistor having a gate as a first voltage input terminal of the multi-input comparator, the first voltage input receiving a first voltage; a second differential transistor forming a differential transistor pair with the first differential transistor, a gate thereof serving as a second voltage input terminal of the multi-input comparator, and a second voltage input terminal receiving a second voltage;
- the multi-input comparator further includes a resistor, one end of the resistor is connected to the source of the first differential transistor, and the other end of the resistor is connected to the source of the second differential transistor, wherein the resistor and the a node connected to a differential transistor as a current input terminal of the multi-input comparator, the current input terminal is connected to an injection current source; or a node connected to the second differential transistor as a current input of the multi-input comparator The current input terminal is connected to the current extraction source.
- a power conversion circuit includes: the multi-input comparator, wherein a current input terminal is connected to a DC current source or a DC current source, and the error amplification signal is used as a first voltage.
- the triangular wave signal is input as a second voltage to the second voltage input end, and is used for comparing the error amplification signal and the triangular wave signal to generate a pulse width modulation signal; comprising a power conversion pole of the power switch, used in the power switch
- An input voltage is converted into an output voltage under the control of turning on and off, wherein the pulse width modulation signal drives the power switch to be turned on and off; and the voltage sampling circuit is configured to sample the output voltage to obtain a Feedback voltage; an error amplifier for error amplifying the reference voltage and the feedback voltage to generate the error amplification signal.
- Figure 1 is a schematic diagram of a comparative principle of a PWM comparator
- Figure 2 is a schematic diagram of two sawtooth signals before and after voltage boosting
- Figure 3 is a circuit diagram of a conventional boost sawtooth signal Ramp
- Figure 4 is a schematic diagram of the conventional current mode error amplifier output signal EAO minus the current sampling signal ISEN, and then compared with the boosted sawtooth signal RampSH to generate a pulse width modulation signal PWMO;
- 5A is a schematic circuit diagram of a first implementation of the multi-input comparator of the present invention in the first embodiment
- 5B is a schematic circuit diagram of a second implementation manner of the multi-input comparator of the present invention in the first embodiment
- 5C is a schematic circuit diagram of a third implementation manner of the multi-input comparator of the present invention in the first embodiment
- 5D is a schematic circuit diagram of a fourth implementation manner of the multi-input comparator of the present invention in the first embodiment
- 5E is a schematic circuit diagram of a fifth implementation manner of the multi-input comparator of the present invention in the first embodiment
- 5F is a schematic circuit diagram of a sixth implementation manner of the multi-input comparator of the present invention in the first embodiment
- 6A is a schematic circuit diagram of a first implementation manner of a multiple input comparator of the present invention in a second embodiment
- 6B is a schematic circuit diagram of a second implementation manner of the multiple input comparator of the present invention in the second embodiment
- FIG. 7 is a circuit diagram of a multi-input comparator of the present invention in a third embodiment
- FIG. 8A is a circuit diagram showing a first implementation of a power conversion circuit of an embodiment of the present invention.
- 8B is a circuit diagram showing a second implementation manner of the power conversion circuit of the present invention in an embodiment
- 8C is a circuit diagram showing a third implementation manner of the power conversion circuit of the present invention in an embodiment. Intention; and
- Figure 8D is a circuit diagram showing a fourth implementation of the power conversion circuit of the present invention in one embodiment.
- one embodiment or “an embodiment” as used herein means that a particular feature, structure, or characteristic associated with the described embodiments can be included in at least one implementation of the invention.
- the appearances of the "a” or “an” In addition, the order of the modules in the method, the flowchart or the functional block diagrams of the one or more embodiments is not intended to be in any specific order, and is not intended to limit the invention.
- Figure 5A is a circuit diagram showing a first implementation of the multi-input comparator of the first embodiment 500 of the present invention.
- the multi-input comparator 500 includes a first differential transistor MP51, a second differential transistor MP52 that forms a differential transistor pair with the first differential transistor MP51, a first resistor R51, a second resistor R52, and a current source. 151, wherein an aspect ratio of the first differential transistor MP51 is equal to an aspect ratio of the second differential transistor MP52.
- the first differential transistor MP51 is a PMOS transistor having a gate as a first voltage input terminal of the multi-input comparator, the first voltage input terminal receives a first voltage EAO
- the second differential transistor MP52 is also a PMOS transistor having a gate as a second voltage input terminal of the multi-input comparator, the second voltage input terminal receiving a second voltage Ramp, one end of the first resistor R51 and a source of the first differential transistor MP51 Connected, one end of the second resistor R52 is connected to the source of the second differential transistor MP52, the other end of the first resistor R51 is connected to the other end of the second resistor R52 at the node Vcm, and the current source 151 is injected.
- the mode is connected to the node Vcm.
- the current input terminal INJ is connected to an injection current source, and the injection current source can be injected into the current input terminal.
- Current It should be noted that one node is connected to the injection current.
- the source means that the injected current source will inject a current into the node, and a node connected to the current sink (Current Sink) means that the pumping current source will draw a current to the node.
- the multi-input comparator 500 further includes: NMOS transistors MN51, MN52 and MN53, a current source 152, and an inverter INV51.
- the drain of the NMOS transistor MN51 is connected to the drain of the first differential transistor MP51, the source thereof is grounded, and the gate thereof is connected to the drain thereof; the drain of the NMOS transistor MN52 and the second differential transistor MP52 The drain is connected, its source is grounded, and its gate is connected to the gate of the NMOS transistor MN51.
- the NMOS transistors MN51 and MN52 form a 1 : 1 current mirror.
- the drain of the NMOS transistor MN53 is connected to the current source 152, the source thereof is grounded, the gate thereof is connected to the drain of the NMOS transistor MN52, and the input terminal of the inverter INV51 is connected to the intermediate node of the current source 152 and the NMOS transistor MN53.
- the other end acts as a voltage output PWMO.
- the current of the second differential transistor MP52 is equal to the current of the NMOS transistor MN52, and the NMOS transistor MN51 and the NMOS transistor MN52 are the 1:1 current mirror and the length and width of the first differential transistor MP51.
- the ratio is equal to the aspect ratio of the second differential transistor MP52. Therefore, when the flip point is corresponding, the gate-source voltage Vgs of the first differential transistor MP51 and the gate-source voltage Vgs of the second differential transistor MP52 are also equal, according to the circuit principle:
- VEAO is the voltage of the error amplification signal EAO
- VRamp is the voltage of the sawtooth Ramp
- VR51 is the voltage drop of the first resistor R51
- VGS MP51 MP51 tube The gate-source voltage
- VGS MP52 is the gate-source voltage of the MP52 transistor
- Vcm the voltage of the Vcm node
- II is the current flowing through the first resistor R51
- I IN j is the current injected into the current input terminal. 3 ⁇ 4 ⁇ indicates the bias voltage.
- the multi-input comparator 500 implements VEAO and VRamp+V. Comparison of ffset .
- the resistance of the first resistor R51 can be selected to be equal to the resistance of the second resistor R52, both R, then V.
- Ffset R*I, if I is a DC current, the equivalent VRamp signal is raised by R* l m] . If ⁇ ⁇ is a sampling current ISEN, the voltage corresponding to VRamp and sampling current ISEN can be realized. Add together.
- the resistance of the first resistor R51 may not be equal to the resistance of the second resistor R52, in order to achieve VRamp more easily.
- the second resistor R52 has a higher resistance than the first resistor R51.
- the injection current I!NJ can be easily obtained from the reference current source circuit which is usually present in various analog chips, can be generated based on the constant-gm type current source, or can be based on AV BE /R type, V th / R-type, VB E / R type or current source generation circuit based on band-gap reference.
- a current source based on a Band-gap reference can achieve better results, and the boosted voltage amplitude is more constant, proportional to the bandgap voltage.
- the aspect ratio of the first differential transistor MP51 may not be equal to the aspect ratio of the second differential transistor MP52, and the aspect ratios of the NMOS transistors MN51 and MN52 must also be unequal.
- the aspect ratio of MP51 and MP52 and the aspect ratio of MN51 and MN52 can be set freely, as long as the gate and source voltages of MP51 and MP52 are equal when the comparator is flipped.
- the complicated and slow response sawtooth wave lifting circuit shown in FIG. 3 is no longer needed, and the error amplification signal EAO and the current sampling signal ISEN shown in FIG. 4 are no longer needed.
- the subtraction circuit only needs to add two resistors and a current input terminal in the common comparator to realize the voltage boost of the RAMP signal and the subtraction effect of the sampling current and the error amplification signal EAO, which greatly simplifies the circuit structure and also improves The response speed.
- FIG. 5B is a schematic circuit diagram of a second implementation of the multi-input comparator of the first embodiment 500 of the present invention.
- the multi-input comparator shown in FIG. 5B is substantially the same as the multi-input comparator shown in FIG. 5A, except that: the multi-input comparator shown in FIG. 5B
- a node connecting the two resistors R52 and the second differential transistor MP52 serves as a current input terminal INL of the multi-input comparator 500.
- the current input terminal INJ is connected to the extraction current source, and the extraction current source can extract current from the current input terminal.
- FIG. 5C is a schematic circuit diagram of a third implementation of the multi-input comparator of the first embodiment 500 of the present invention.
- the multi-input comparator shown in FIG. 5C is mostly the same as the multi-input comparator shown in FIG. 5A, except that: the multi-input comparator shown in FIG. 5C does not.
- a first resistor R51 is provided, and a source of the first differential transistor MP51 serves as a current input terminal INJ of the multi-input comparator 500.
- VEAO VRamp+V.
- FIG. 5D is a schematic circuit diagram of a fourth implementation of the multi-input comparator of the first embodiment 500 of the present invention.
- the multi-input comparator shown in FIG. 5D is mostly the same as the multi-input comparator shown in FIG. 5C, except that: in the multi-input comparator shown in FIG. 5D A connection point of the second differential transistor MP51 and the second resistor R52 is used as a current input terminal INL of the multi-input comparator 500.
- the current input terminal INJ is connected to an extraction current source, and the extraction current source can extract current from the current input terminal.
- the differential transistors MP1 and MP2 shown in Figures 5A-D are PMOS transistors, and it is obvious that they can be implemented by other transistors, such as NMOS transistors.
- 5E is a circuit diagram of a fifth implementation of the multi-input comparator of the first embodiment 500 of the present invention, wherein the differential transistors are all NMOS transistors.
- the main difference between the multi-input comparator shown in FIG. 5E and the multi-input comparator shown in FIGS. 5A and 5B is that the transistor MP51 in FIGS. 5A and 5B is shown.
- MP52 is a differential transistor pair
- transistors MN51 and MN52 in Figure 5E are differential transistor pairs
- PMOS transistors are modified for NMOS transistors, and other modifications.
- FIG. 5E when the first resistor R51 and the connection node INJ1 of the first differential transistor MN51 are used as current inputs, the current input terminal is connected to the injection current source. at this time,
- VEAO Vcm+VR51+IVGS MP51 l
- VRamp Vcm +VR52+IVGS MP52 I
- V. Ffset2 R51*( 12+ I) - R52*I2,
- 5F is a circuit diagram of a sixth implementation of the multi-input comparator of the first embodiment 500 of the present invention, wherein the differential transistors are also NMOS transistors.
- the main difference between the multi-input comparator shown in FIG. 5F and the multi-input comparator shown in FIG. 5E is that: the second resistor is not provided in the multi-input comparator shown in FIG. 5F. R52.
- Ffset2 R51*( 12+ I) - R52*I2
- VEAO VRamp+V.
- Ffset2 , V. Ffset2 R51* (12+I)
- 12 is the current flowing from the second differential transistor MP52 to the current source 152.
- the source of the second differential transistor MN52 is the current input terminal INJ2
- Ffset2 , V. Ffset2 R51*( 12+ I) is also applicable
- I IW represents the current drawn from the current input terminal INJ2.
- Figure 6A is a circuit diagram showing a first implementation of the multi-input comparator of the second embodiment 600 of the present invention.
- the multi-input comparator 600 also includes a first differential transistor MP61, and a first difference, compared to the multi-input comparator 500 illustrated in FIGS. 5A and 5B.
- the transistor MP61 forms the second differential transistor MP62 of the differential transistor pair, the first resistor R61, the second resistor R62, and the current source 161, and the above-described electrical devices are connected in the same manner as in FIGS. 5A and 5B, and the description thereof will not be repeated here.
- connection node ⁇ of the first resistor R61 and the first differential transistor MP61 can serve as a current input terminal, and the current input terminal is connected to the injection current source.
- the node INJ2 of the second resistor R62 connected to the second differential transistor MP62 can also serve as a current input terminal, and the current input terminal INJ is connected to the injection current source.
- the multi-input comparator 600 further includes: PMOS transistors MP63 and MP64, NMOS transistors MN61, MN62, MN63, and MN64, and an inverter INV61.
- the source of the PMOS transistor MP63 is connected to the power supply VDD, the gate thereof is connected to the drain thereof, and the drain thereof is connected to the drain of the NMOS transistor MN64.
- the source of the MN 64 is grounded.
- the drain of the MN61 transistor is connected to the drain of the first differential transistor MP61, the source thereof is grounded, and the gate thereof is connected to the gate of the NMOS transistor MN64; the drain of the NMOS transistor MN62 and the second The drain of the differential transistor MP62 is connected and its source is grounded.
- the source of the PMOS transistor MP64 is connected to the power supply VDD, the gate thereof is connected to the gate of the PMOS transistor MP63, and the drain thereof is connected to the drain of the NMOS transistor MN63.
- the source of the NMOS transistor MN63 is grounded, and the gate thereof and the NMOS are connected.
- the gate of the tube MN62 is connected.
- the input terminal of the inverter INV61 is connected to the intermediate node of the PMOS transistor MP64 and the NMOS transistor MN63, and its output terminal is used as the voltage output terminal PWMO of the multi-input comparator 600.
- MN61 and MN64 form a current mirror
- MN63 and MN62 form a current mirror
- MP63 and MP64 form a current mirror.
- FIG. 6B is a schematic circuit diagram of a second implementation of the multi-input comparator of the second embodiment 600 of the present invention.
- the multi-input comparator shown in FIG. 6B is mostly the same as the multi-input comparator shown in FIG. 6A, except that: the multi-input comparator shown in FIG. 6B does not.
- the first resistor R61 is provided, and the source of the first differential transistor MP61 is extremely ⁇ .
- VEAO VRamp + V. Ffsetl , V.
- FIG. 7 is a circuit diagram of a multi-input comparator of the present invention in a third embodiment 700.
- the multi-input comparator 700 also includes a first differential transistor MP71 and a second differential transistor pair with the first differential transistor MP71, as compared to the multi-input comparator 600 illustrated in FIG. 6A.
- the differential transistor MP72, the first resistor R71, the second resistor R72, and the current source 171, and the above-described electrical device are connected in the same manner as in FIG. 6A, and the description thereof will not be repeated here.
- connection node ⁇ of the first resistor R71 and the first differential transistor MP71 can serve as a current input terminal, and the current input terminal is connected to the injection current source.
- the node INJ2 of the second resistor R72 connected to the second differential transistor MP72 can also serve as a current input terminal, and the current input terminal INJ is connected to the injection current source.
- the multi-input comparator 700 further includes: PMOS transistors MP73, MP74, NMOS transistors MN73, MN74, MN71, and MN72, a first inverter INV71 and a second inverter INV72.
- the source of the PMOS transistor MP73 is connected to the power supply VDD, the drain thereof is connected to the drain of the NMOS transistor MN73, the gate thereof is connected to the drain thereof, and the source of the NMOS transistor MN73 is connected to the drain of the NMOS transistor MN71, the MN71 The source is grounded.
- the source of the PMOS transistor MN74 is connected to the power supply VDD, the drain thereof is connected to the drain of the NMOS transistor MN74, the gate thereof is connected to the gate of the MP73 tube, and the source of the MN74 is connected to the drain of the NMOS transistor MN72.
- the gate is connected to the gate of the MN73 transistor, the source of the MN72 is grounded, and the gate is connected to the gate of the MN71.
- the input end of the first inverter INV71 is connected to the intermediate node of the PMOS transistor MP74 and the NMOS transistor MN74, the output end thereof is connected to the input end of the second inverter INV72, and the output end of the second inverter INV72 is used as the The voltage output PWMO of the comparator 700 is input.
- MN71 and MN72 form a current mirror
- MN73 and MN74 form a current mirror
- MP73 and MP74 form a current mirror.
- the first resistor R71 can also be set to zero.
- the multi-input comparator of the present invention realizes the gate voltage VEAO of the first differential transistor by connecting the first resistor and/or the second resistor to the source of the first differential transistor and/or the second differential transistor.
- the comparison of the gate voltage VRamp of the second differential transistor and the sum of the offset voltages, the above settings can be applied to various types of comparator input stages, and the first stage or other stages of the comparator have many existing implementations, here I will not introduce them one by one.
- the NMOS transistor can also be used to implement the differential transistor pair in the multi-input comparator shown in FIGS. 6A, 6B, and 7, and the multi-input comparator shown in FIG. 5E and FIG. 5F can be specifically implemented. .
- FIG. 8A is a schematic circuit diagram of a first implementation of a power conversion circuit of an embodiment 800 of the present invention.
- the power conversion circuit 800 includes a multi-input comparator. 810, power conversion stage 830, voltage sampling circuit 840, and error amplifier 850.
- the multi-input comparator 810 can be any one of the types shown in FIG. 5-7. It can be seen from the above description that it has not only two voltage input terminals but also a current input terminal INL, the current input terminal INJ.
- the error amplification signal EAO is input as the first voltage input to the first voltage input terminal
- the triangular wave signal Ramp is used as the second voltage input to the second voltage input terminal for comparing the error amplification signal EAO and the triangular wave signal Ramp to generate pulses Wide modulation signal.
- the power conversion stage 830 includes a power switch for converting an input voltage Vin into an output voltage Vo under the control of turning on and off of the power switch, wherein the pulse width modulation signal drives the conduction of the power switch Pass and shut down.
- the voltage sampling circuit 840 is configured to sample the output voltage to obtain a feedback voltage Vfb.
- the error amplifier 850 performs error amplification on the reference voltage Vref and the feedback voltage Vfb to generate the error amplified signal EAOo.
- the triangular wave signal Ramp is generally generated by an oscillator OSC
- the pulse width modulated signal is The power switch is turned on and off by the PWM controller 820.
- the multi-input comparator 810 flips the pulse width modulation signal output by the multi-input comparator PWM, that is, from a high level to a low level. The level, or a low level transition to a high level, the deviation voltage is linearly proportional to the injection current.
- FIG. 8B is a circuit diagram showing a second implementation of the power conversion circuit of the present invention in an embodiment 800.
- the power conversion circuit shown in FIG. 8B is mostly the same as the power conversion circuit shown in FIG. 8A, except that the power conversion circuit 800 further includes a current sampling circuit 860. And a current for sampling the power switch in the power conversion stage, and connecting the sampling current to the current input terminal in an injection manner.
- FIG. 8C is a circuit diagram showing a third implementation of the power conversion circuit of the present invention in an embodiment 800.
- the power conversion circuit shown in FIG. 8C is mostly the same as the power conversion circuit shown in FIG. 8A, except that: the current input terminal of the multi-input comparator 810 is input. The current is connected to the DC current source IDC in an extracted manner.
- FIG. 8D is a circuit diagram of a fourth implementation of the power conversion circuit of the present invention in an embodiment 800.
- the power conversion circuit shown in FIG. 8D is mostly the same as the power conversion circuit shown in FIG. 8B, except that the DC current source IDC and the power obtained by the current sampling circuit 860 are obtained.
- the current of the switch is connected in an extracted manner to the multi-input comparison Current input of the device.
- the multi-input comparator of the present invention can add a more complex comparison function by adding a current input terminal, and can also simplify the circuit design.
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SG2010047041A SG174846A1 (en) | 2010-04-12 | 2010-06-21 | Multiple-input comparator and power converter |
CA2707889A CA2707889A1 (en) | 2010-04-12 | 2010-06-21 | Multiple-input comparator and power converter |
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CN2010101442858A CN101847981B (zh) | 2010-04-12 | 2010-04-12 | 多输入比较器和电源转换电路 |
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CN101902215B (zh) * | 2010-08-02 | 2012-09-26 | 中颖电子股份有限公司 | 四输入端比较器 |
CN102447410B (zh) * | 2010-10-11 | 2015-11-25 | 北京中星微电子有限公司 | Ac-dc电源转换器及其环路补偿电路 |
CN102111133A (zh) * | 2011-03-29 | 2011-06-29 | 无锡中星微电子有限公司 | 迟滞电路 |
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US10742451B2 (en) * | 2018-06-12 | 2020-08-11 | Kandou Labs, S.A. | Passive multi-input comparator for orthogonal codes on a multi-wire bus |
JP7063753B2 (ja) * | 2018-07-13 | 2022-05-09 | エイブリック株式会社 | ボルテージレギュレータ及びボルテージレギュレータの制御方法 |
CN111355492B (zh) * | 2018-12-21 | 2023-03-24 | 瑞昱半导体股份有限公司 | 比较器及模拟数字转换电路 |
CN112994697B (zh) * | 2021-04-21 | 2021-07-30 | 微龛(广州)半导体有限公司 | 一种比较器 |
CN116192144B (zh) * | 2023-02-13 | 2024-04-02 | 集益威半导体(上海)有限公司 | 异步逐次逼近式模数转换器 |
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- 2010-04-12 CN CN2010101442858A patent/CN101847981B/zh active Active
- 2010-06-21 WO PCT/CN2010/074166 patent/WO2011127686A1/zh active Application Filing
- 2010-06-21 SG SG2010047041A patent/SG174846A1/en unknown
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Also Published As
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CN101847981A (zh) | 2010-09-29 |
CN101847981B (zh) | 2012-06-06 |
SG174846A1 (en) | 2011-11-28 |
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