CN108336905B - DC-DC circuit - Google Patents
DC-DC circuit Download PDFInfo
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- CN108336905B CN108336905B CN201711140586.1A CN201711140586A CN108336905B CN 108336905 B CN108336905 B CN 108336905B CN 201711140586 A CN201711140586 A CN 201711140586A CN 108336905 B CN108336905 B CN 108336905B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the technical field of switching power supplies, in particular to a DC-DC circuit, which comprises an input voltage end, a first output end, a second output end and a first switching circuit, wherein the input voltage end is connected with the first output end; an output voltage terminal; the first switch branch circuit controllably conducts the input voltage end and a first reference node under the action of a first driving signal; the second switch branch circuit controllably conducts the first reference node and the grounding terminal under the action of a second driving signal; the energy storage element is alternately charged or discharged during the circuit operation; the PWM signal generating unit compares a first voltage feedback signal sampled from an output voltage end with a voltage comparison signal to generate a first driving signal and a second driving signal; the voltage comparison signal is generated by an error amplifier, and the error amplifier is used for generating a second voltage feedback signal fed back from the output voltage end after operating with a reference voltage. The invention can improve the working stability of the COT switching circuit and reduce the ripple of the output voltage of the COT.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a DC-DC circuit.
Background
The DC-DC switching power supply has a plurality of control modes, and can be generally divided into a voltage mode and a current mode according to a sampling signal. The voltage mode carries out negative feedback by sampling output voltage, and the current mode carries out negative feedback by sampling input current and output voltage; the current formwork mechanism comprises: Peak-Current Mode, Average-Current Mode and hysteresis-Current Mode; the duty ratio Modulation method includes Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), Constant On Time mode (COT), Fixed Off Time mode (FOT), and dead-Bang control (Bang-Bang).
As shown in fig. 1, the conventional COT-mode circuit diagram has a fast response speed, but a voltage ripple having the same phase as an inductor current needs to be generated by an ESR resistor to stabilize a loop, and stability is difficult when the ESR is extremely small, such as a ceramic capacitor.
Disclosure of Invention
In order to solve the above technical problems, the present invention is directed to a DC-DC circuit, which includes,
an input voltage terminal (VIN);
an output voltage terminal (VOUT);
a first switching branch controllably conducting the input voltage terminal (VIN) and a first reference node (X0) by a first driving signal (HS);
a second switching branch controllably turning on the first reference node (X0) and the Ground (GND) under a second driving signal (LS);
an energy storage element (OLB) connected between the first reference node (X0) and the output voltage terminal (VOUT) for alternately charging or discharging during circuit operation;
the PWM signal generating unit compares a first voltage feedback signal (FB _ S) sampled from the output voltage end with a voltage comparison signal (LPF) to generate the first driving signal (HS) and the second driving signal (LS);
the voltage comparison signal (LPF) is generated by an error amplifier (OPA1), and the error amplifier (OPA1) is used for generating a second voltage feedback signal (FB) fed back from the output voltage end after being operated with a reference Voltage (VREF).
The DC-DC switching power supply of the present invention, the PWM signal generating unit includes:
a comparator (PWMCOMP), a non-inverting input terminal of the comparator (PWMCOMP) is connected to the voltage comparison signal (LPF), an inverting input terminal of the comparator (PWMCOMP) is connected to the first voltage feedback signal (FB _ S), and the comparator (PWMCOMP) is configured to compare the voltage comparison signal (LPF) and the first voltage feedback signal (FB _ S) to generate a comparison pulse signal;
and the signal driving unit (PWM DRV) is connected with the comparator (PWMCOMP) and is used for processing the signal output by the comparator (PWMCOMP) to generate the first driving signal (HS) and the second driving signal (LS).
According to the DC-DC switching power supply, the first voltage feedback signal (FB _ S) is generated through a first resistance voltage division branch circuit, the first resistance voltage division branch circuit comprises a predetermined number of first group of voltage division resistors which are mutually connected in series between the output voltage end (VOUT) and the ground end (GND), points connected among the first group of voltage division resistors form voltage division nodes, and the first voltage feedback signal (FB _ S) is led out from the predetermined first voltage division nodes.
According to the DC-DC switching power supply, the second voltage feedback signal (FB) is generated through a second resistance voltage division branch circuit, the second resistance voltage division branch circuit comprises a predetermined number of second group of voltage division resistors which are mutually connected in series between the output voltage end (VOUT) and the ground end (GND), points connected among the second group of voltage division resistors form voltage division nodes, and the second voltage feedback signal (FB) is led out from the predetermined second voltage division nodes.
According to the DC-DC switching power supply, a first capacitor (C0) is connected between the first voltage division node and the output voltage terminal (VOUT).
According to the DC-DC switching power supply, an ESR (equivalent series resistance) and an output Capacitor (COUT) connected with the ESR in series are connected between the output voltage end (VOUT) and the grounding end (GND).
According to the DC-DC switching power supply, a second capacitor (C2) is connected between the second voltage division node and the output voltage terminal (VOUT).
In the DC-DC switching power supply, the non-inverting input end of the error amplifier (OPA1) is connected with the second voltage feedback signal (FB), and the inverting input end of the error amplifier (OPA1) is connected with the reference Voltage (VREF).
According to the DC-DC switching power supply, a third Capacitor (CF) is connected between the output end of the error amplifier (OPA1) and the ground end (GND).
According to the DC-DC switching power supply, a load resistor (Rload) is connected between the output voltage end (VOUT) and the ground end (GND).
Has the advantages that: the invention adds an error amplifier for generating a voltage comparison signal, thereby improving the working stability of the COT switching circuit and reducing the ripple of the output voltage of the COT.
Drawings
FIG. 1 is a circuit configuration diagram of a COT mode of the prior art;
fig. 2 is a circuit configuration diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described below with reference to the drawings and the specific examples, but the invention is not limited thereto.
Referring to fig. 2, a DC-DC circuit, specifically comprising,
an input voltage terminal (VIN);
an output voltage terminal (VOUT);
a first switching branch for controllably connecting the input voltage terminal (VIN) and a first reference node (X0) under the action of a first driving signal (HS);
the second switch branch is used for controllably conducting the first reference node (X0) and the ground terminal (GND) under the action of a second driving signal (LS);
an energy storage element (OLB) connected between the first reference node (X0) and the output voltage terminal (VOUT) for alternately charging or discharging during circuit operation;
the PWM signal generating unit compares a first voltage feedback signal (FB _ S) sampled from an output voltage end with a voltage comparison signal (LPF) to generate a first driving signal (HS) and a second driving signal (LS);
the voltage comparison signal (LPF) is generated by an error amplifier (OPA1), and the error amplifier (OPA1) is used for generating a second voltage feedback signal (FB) fed back from the output voltage end after being operated with a reference Voltage (VREF).
The DC-DC circuit based on the basic COT framework adds one path of voltage outer ring control target voltage, can improve the working stability of the switching circuit and reduce the ripple of the COT output voltage.
With reference to fig. 1 and 2, the original inner loop, i.e. the first voltage feedback signal, is obtained by improving any resistance voltage division, and for the ceramic capacitor, even with an ESR capacitor of 10Mohm, an equivalent ESR above 100Mohm can be realized by the resistance voltage division, so that the system is more easily designed and stable.
In the DC-DC switching power supply of the present invention, the PWM signal generating unit includes:
the comparator (PWMCOMP) is used for comparing the voltage comparison signal (LPF) with the first voltage feedback signal (FB _ S) to generate a comparison pulse signal;
and the signal driving unit (PWM DRV) is connected with the comparator (PWMCOMP) and is used for processing the signal output by the comparator (PWMCOMP) and then generating a first driving signal (HS) and a second driving signal (LS).
According to the DC-DC switching power supply, a first voltage feedback signal (FB _ S) is generated through a first resistance voltage division branch circuit, the first resistance voltage division branch circuit comprises a predetermined number of first group of voltage division resistors which are mutually connected in series between an output voltage end (VOUT) and a ground end (GND), points connected among the first group of voltage division resistors form voltage division nodes, and the first voltage feedback signal (FB _ S) is led out from the predetermined first voltage division nodes.
According to the DC-DC switching power supply, the second voltage feedback signal (FB) is generated through a second resistance voltage division branch circuit, the second resistance voltage division branch circuit comprises a predetermined number of second group of voltage division resistors which are mutually connected in series between an output voltage end (VOUT) and a ground end (GND), points connected among the second group of voltage division resistors form voltage division nodes, and the second voltage feedback signal (FB) is led out from the predetermined second voltage division nodes.
According to the DC-DC switching power supply, an ESR (equivalent series resistance) and an output Capacitor (COUT) connected with the ESR in series are connected between an output voltage end (VOUT) and a ground end (GND).
In the DC-DC switching power supply, the non-inverting input end of an error amplifier (OPA1) is connected with a second voltage feedback signal (FB), and the inverting input end of the error amplifier (OPA1) is connected with a reference Voltage (VREF).
In the DC-DC switching power supply, a third Capacitor (CF) is connected between the output end of the error amplifier (OPA1) and the ground end (GND).
According to the DC-DC switching power supply, a load resistor (Rload) is connected between an output voltage end (VOUT) and a ground end (GND).
In a preferred embodiment, the first group of voltage dividing resistors includes a resistor R0 and a resistor R1, the resistor R0 and the resistor R1 are connected in series, and the ratio of the resistances of the resistor R0 and the resistor R1 can be set arbitrarily; the second group of voltage division resistors comprises a resistor R5 and a resistor R4, and the resistor R5 and the resistor R4 are connected in series with each other.
In a preferred embodiment, the first switch branch comprises a PMOS transistor (M1), a gate of the PMOS transistor (M1) is connected to the first driving signal (HS), a source of the PMOS transistor is connected to the input voltage terminal (VIN), a drain of the PMOS transistor is connected to the first reference node (X0), the second switch branch comprises an NMOS transistor (M0), a gate of the NMOS transistor (M0) is connected to the second driving signal (LS), a source of the NMOS transistor is connected to the ground terminal (GND), and a drain of the NMOS transistor is connected to the first reference node (X0).
Compared with the prior art that only one group of resistance voltage division circuits are arranged, the resistance voltage division circuit is additionally provided with one group of resistance voltage division circuits, the error amplifier is additionally arranged, the second resistance voltage division branch can be randomly set to be lower in voltage, for example, the second resistance voltage division branch is set to be 1/16, equivalent ESR can be amplified by 16 times, the error amplifier ensures the precision of the whole circuit, and the comparator (PWMCOMP) is used for accelerating response speed and stabilizing a loop.
In a preferred embodiment of the method according to the invention,
according to the DC-DC switching power supply, a first capacitor (C0) is connected between the first voltage division node and the output voltage terminal (VOUT).
According to the DC-DC switching power supply, a second capacitor (C2) is connected between the second voltage division node and the output voltage end (VOUT).
The divider resistor is connected with a capacitor in parallel, the impedance of the first capacitor (C0) at the switching frequency point is lower than that of the resistor R0, and/or the impedance of the second capacitor (C2) at the switching frequency point is lower than that of the resistor R5, so that the alternating current signal can be improved remarkably, and the direct current voltage stabilization is not influenced. The knee frequency is set at about 1/10 of the switching frequency, which for an RC cell means a cutoff frequency of 50kHz when the switching frequency is 500 kHz. Since C is 1/2 pi RF, a capacitance value of approximately 1,000pF can be calculated when R1 equals 3k Ω. Therefore, an ac feedback signal increased by 4 times can be obtained, and theoretically, the ESR can be reduced by 4 times.
A preferred embodiment may further include a second error amplifier, wherein the non-inverting input terminal of the second error amplifier is connected to a TEMPCO signal, and the inverting input terminal of the second error amplifier is connected to a reference VO signal; furthermore, the device also comprises a third error amplifier, wherein the non-inverting input end of the third error amplifier is connected with a XXX _ OTHER signal, and the inverting input end of the third error amplifier is connected with a reference V1 signal. The constant-current temperature control circuit is used for being connected with the error amplifier in parallel to realize the functions of temperature control and constant current.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A DC-DC circuit, comprising,
an input voltage terminal (VIN);
an output voltage terminal (VOUT);
a first switching branch controllably conducting the input voltage terminal (VIN) and a first reference node (X0) by a first driving signal (HS);
a second switching branch controllably conducting the first reference node (X0) and Ground (GND) in response to a second driving signal (LS);
an energy storage element (OLB) connected between the first reference node (X0) and the output voltage terminal (VOUT) for alternately charging or discharging during circuit operation;
the PWM signal generating unit compares a first voltage feedback signal (FB _ S) sampled from the output voltage end with a voltage comparison signal (LPF) to generate the first driving signal (HS) and the second driving signal (LS);
the voltage comparison signal (LPF) is generated by an error amplifier (OPA1), and the error amplifier (OPA1) is used for generating a second voltage feedback signal (FB) fed back from the output voltage end after being operated with a reference Voltage (VREF).
2. The DC-DC circuit according to claim 1, wherein the PWM signal generation unit comprises:
a comparator (PWMCOMP), a non-inverting input terminal of the comparator (PWMCOMP) is connected to the voltage comparison signal (LPF), an inverting input terminal of the comparator (PWMCOMP) is connected to the first voltage feedback signal (FB _ S), and the comparator (PWMCOMP) is configured to compare the voltage comparison signal (LPF) and the first voltage feedback signal (FB _ S) to generate a comparison pulse signal;
and the signal driving unit (PWM DRV) is connected with the comparator (PWMCOMP) and is used for processing the signal output by the comparator (PWMCOMP) to generate the first driving signal (HS) and the second driving signal (LS).
3. The DC-DC circuit of claim 1, wherein the first voltage feedback signal (FB _ S) is generated by a first resistor voltage dividing branch, the first resistor voltage dividing branch comprises a first set of voltage dividing resistors connected in series between the output voltage terminal (VOUT) and the ground terminal (GND), a predetermined number of points of connection between the first set of voltage dividing resistors form voltage dividing nodes, and the first voltage feedback signal (FB _ S) is derived from the predetermined first voltage dividing nodes.
4. The DC-DC circuit of claim 1, wherein the second voltage feedback signal (FB) is generated by a second resistor dividing branch, the second resistor dividing branch comprises a predetermined number of second dividing resistors connected in series between the output voltage terminal (VOUT) and the ground terminal (GND), a point of connection between the second dividing resistors forms a dividing node, and the second voltage feedback signal (FB) is derived from the predetermined second dividing node.
5. A DC-DC circuit according to claim 3, characterized in that a first capacitor (C0) is connected between the first voltage dividing node and the output voltage terminal (VOUT).
6. The DC-DC circuit according to claim 1, wherein an ESR resistor and an output Capacitor (COUT) connected in series with the ESR resistor are connected between the output voltage terminal (VOUT) and the ground terminal (GND).
7. The DC-DC circuit according to claim 4, wherein a second capacitor (C2) is connected between the second voltage division node and the output voltage terminal (VOUT).
8. The DC-DC circuit according to claim 4, characterized in that a non-inverting input of the error amplifier (OPA1) is connected to the second voltage feedback signal (FB) and an inverting input of the error amplifier (OPA1) is connected to the reference Voltage (VREF).
9. A DC-DC circuit according to claim 1, characterized in that a third Capacitor (CF) is connected between the output of the error amplifier (OPA1) and Ground (GND).
10. The DC-DC circuit according to claim 1, wherein a load resistor (Rload) is connected between the output voltage terminal (VOUT) and a ground terminal (GND).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711140586.1A CN108336905B (en) | 2017-11-16 | 2017-11-16 | DC-DC circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711140586.1A CN108336905B (en) | 2017-11-16 | 2017-11-16 | DC-DC circuit |
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| CN108336905A CN108336905A (en) | 2018-07-27 |
| CN108336905B true CN108336905B (en) | 2020-12-04 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149938B (en) * | 2018-08-30 | 2020-12-04 | 上海芯导电子科技有限公司 | DC-DC circuit |
| CN109861527B (en) * | 2019-04-02 | 2020-04-10 | 无锡职业技术学院 | Switching power supply system based on hysteresis mode control |
| CN110299843B (en) * | 2019-06-14 | 2021-05-25 | 上海芯导电子科技有限公司 | Composite DCDC circuit |
| CN110417262A (en) * | 2019-06-28 | 2019-11-05 | 上海芯导电子科技有限公司 | A kind of loop compensation circuit |
| CN114337281A (en) * | 2021-12-28 | 2022-04-12 | Oppo广东移动通信有限公司 | Voltage control circuit and method based on COT (chip on Board) architecture and power supply equipment |
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Address after: No. 2277 Lane 7, Zuchong Road, China (Shanghai) Free Trade Pilot Area, Pudong New Area, Shanghai, 200120 Patentee after: Shanghai Xindao Electronic Technology Co.,Ltd. Address before: Zuchongzhi road in Pudong New Area Zhangjiang hi tech park Shanghai 201203 Lane 2277 Building No. 7 Patentee before: SHANGHAI PRISEMI ELECTRONIC TECHNOLOGY Co.,Ltd. |