CN218733874U - Control circuit and switching power supply - Google Patents
Control circuit and switching power supply Download PDFInfo
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- CN218733874U CN218733874U CN202222219749.8U CN202222219749U CN218733874U CN 218733874 U CN218733874 U CN 218733874U CN 202222219749 U CN202222219749 U CN 202222219749U CN 218733874 U CN218733874 U CN 218733874U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model relates to a control circuit and switching power supply, the control circuit includes self-adaptation Burst threshold point regulating circuit and Burst comparison circuit; the self-adaptive Burst threshold point adjusting circuit comprises a self-adaptive Burst threshold point adjusting circuit, a first input end of the self-adaptive Burst threshold point adjusting circuit is connected with an input voltage, a second input end of the self-adaptive Burst threshold point adjusting circuit is connected with an output voltage, an output end of the self-adaptive Burst threshold point adjusting circuit generates a first voltage signal, the first voltage signal is connected with a positive input end of a Burst comparator U3, an output end of an error amplifier of a switching power supply is connected with a negative input end of the Burst comparator U3, and an output end of the Burst comparator U3 is connected with an enabling end of a Burst control unit of the switching power supply. The utility model discloses can realize according to different input/output voltage, the light no-load critical Burst's of self-adaptation regulation switching power supply output current size to reduce the light no-load output ripple of switching power supply, be particularly useful for the high-power switching power supply of wide pressure.
Description
Technical Field
The utility model relates to a switching power supply technical field especially relates to a control circuit and switching power supply.
Background
At present, more and more wide-voltage high-power switching power supplies are widely used in military and civil electronic equipment, and for the wide-voltage high-power switching power supplies, the wide-voltage high-power switching power supplies have the characteristics of wide input and output range, wide full-load power coverage range, wide output full-load current point coverage range and the like, and the selection of the Burst threshold value directly influences the light and no-load output ripple of the switching power supplies.
The conventional switch power supply light and no-load control strategy is to directly compare the output of an error amplifier of a switch power supply with an internal constant reference, the method has a single reference, and particularly in a wide-voltage high-power switch power supply, the difference of load currents of a full working condition entering a Burst mode is large, so that output ripples are overlarge in partial working conditions.
SUMMERY OF THE UTILITY MODEL
There is so, the to-be-solved technical problem of the utility model is to provide a control circuit and switching power supply for solve the great problem of the partial operating mode output ripple that the high-power switching power supply of wide pressure adopted single Burst comparison benchmark to cause.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, a control circuit is configured to control a light no-load state of a switching power supply, where the switching power supply includes a power converter and a converter control unit, the converter control unit includes an error amplification circuit and a Burst control unit, and the control circuit includes: the self-adaptive Burst threshold point adjusting circuit comprises a self-adaptive Burst threshold point adjusting circuit and a Burst comparison circuit; the first input end of the self-adaptive Burst threshold point adjusting circuit is used for accessing the input voltage of the power converter, the second input end of the self-adaptive Burst threshold point adjusting circuit is used for accessing the output voltage of the power converter, and the output end of the self-adaptive Burst threshold point adjusting circuit is connected with the positive input end of a Burst comparator U3; the negative input end of the Burst comparator U3 is used for being connected with the output end of the error amplification circuit, and the output end of the Burst comparator U3 is used for being connected with the enabling end of the Burst control unit;
the self-adaptive Burst threshold point adjusting circuit is used for generating a corresponding first voltage signal according to the input voltage and the output voltage and outputting the first voltage signal to the positive input end of the Burst comparator U3;
the Burst comparator U3 is configured to compare the first voltage signal with the Comp voltage signal output by the error amplifying circuit, and output a comparison result to an enable terminal of the Burst control unit, so that the Burst control unit controls the sending of the PWM signal according to the comparison result.
Preferably, the adaptive Burst threshold point adjusting circuit includes: the digital controller comprises an input voltage sampling circuit, an output voltage sampling circuit and a digital controller U4;
the input end of the input voltage sampling circuit is used as the first input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the input voltage of the power converter, and the output end of the input voltage sampling circuit is connected with the first input end of the digital controller U4;
the input end of the output voltage sampling circuit is used as the second input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the output voltage of the power converter, and the output end of the output voltage sampling circuit is connected with the second input end of the digital controller U4;
the output end of the digital controller U4 is used as the output end of the self-adaptive Burst threshold point adjusting circuit and is connected with the positive input end of the Burst comparator U3.
Preferably, the adaptive Burst threshold point adjusting circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and includes: the input voltage sampling circuit collects input voltage of the power converter and outputs the input voltage to the digital controller U4, the output voltage sampling circuit collects output voltage of the power converter and outputs the output voltage to the digital controller U4, and the digital controller U4 generates corresponding first voltage signals according to preset self-adaptive Burst threshold point functions on the input voltage and the output voltage.
Preferably, the adaptive Burst threshold point adjusting circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and includes: the input voltage sampling circuit collects input voltage of the power converter and outputs the input voltage to the digital controller U4, the output voltage sampling circuit collects output voltage of the power converter and outputs the output voltage to the digital controller U4, and the digital controller U4 searches a corresponding first voltage signal in a preset self-adaptive Burst threshold point searching table according to the input voltage and the output voltage.
Preferably, the Burst comparator U3 compares the first voltage signal with the Comp voltage signal output by the error amplifying circuit and outputs a comparison result to an enable terminal of the Burst control unit, so that the Burst control unit controls the transmission of the PWM signal according to the comparison result, including:
when the first voltage signal is greater than the Comp voltage signal, the Burst comparator U3 outputs a comparison result of a high level to an enable terminal of the Burst control unit, so that the Burst control unit enables and stops the transmission of the PWM signal;
when the first voltage signal is less than the Comp voltage signal, the Burst comparator U3 outputs a low-level comparison result to the enable terminal of the Burst control unit, so that the Burst control unit is not enabled and transmits the PWM signal.
Preferably, the input voltage sampling circuit includes a resistor R1 and a resistor R2, one end of the resistor R1 is used as the input end of the input voltage sampling circuit, after the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is used as the output end of the input voltage sampling circuit, and the other end of the resistor R2 is connected to the power ground of the switching power supply.
Preferably, the output voltage sampling circuit includes a resistor R3 and a resistor R4, one end of the resistor R3 is used as the input end of the output voltage sampling circuit, the other end of the resistor R3 is connected with one end of the resistor R4 and then used as the output end of the output voltage sampling circuit, and the other end of the resistor R3 is connected to the power ground of the switching power supply.
In a second aspect, a control circuit is provided for controlling a light no-load state of a switching power supply, where the switching power supply includes a power converter and a converter control unit connected in sequence, where the converter control unit includes an error amplification circuit and a Burst control unit, and the control circuit includes: the self-adaptive Burst threshold point adjusting circuit comprises a self-adaptive Burst threshold point adjusting circuit and a Burst comparison circuit;
the self-adaptive Burst threshold point adjusting circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a digital controller U4;
one end of the resistor R1 is used as a first input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the input voltage of the power converter, and the other end of the resistor R1 is connected with one end of the resistor R2 and a first input end of the digital controller U3; one end of the resistor R3 is used as a second input end of the self-adaptive Burst threshold point adjusting circuit and is used for being connected with the output voltage of the power converter, and the other end of the resistor R3 is connected with one end of the resistor R4 and a second input end of the digital controller U4; the other end of the resistor R2 and the other end of the resistor R4 are connected with the power ground of the switching power supply; the output end of the digital controller U4 is used as the output end of the self-adaptive Burst threshold point adjusting circuit and is connected with the positive input end of the Burst comparator U3; the reverse input end of the Burst comparator U3 is connected and used for being connected with the output end of the error amplification circuit, and the output end of the Burst comparator U3 is used for being connected with the enabling end of the Burst control unit.
In a third aspect, a switching power supply is provided, which includes a power converter, a converter control unit and the control circuit as described above, where the converter control unit includes an error amplification circuit and a Burst control unit connected in sequence; the input end of the power converter is connected with the first input end of the self-adaptive Burst threshold point adjusting circuit and the output end of the Burst control unit, and the output end of the power converter is connected with the second input end of the self-adaptive Burst threshold point adjusting circuit and the first input end of the error amplifying circuit; the output end of the self-adaptive Burst threshold point adjusting circuit is connected with the positive input end of a Burst comparator U3; the reverse input end of the Burst comparator U3 is connected with the output end of the error amplifying circuit; the first input end of the self-adaptive Burst threshold point adjusting circuit samples the input voltage of the power converter, the second input end samples the output voltage of the power converter, a first voltage signal is generated according to the input voltage and the output voltage, and the Burst comparator U3 is used for comparing the first voltage signal with a Comp voltage signal output by the error amplifying circuit and outputting a comparison result to an enabling end of the Burst control unit so that the Burst control unit controls the sending of the PWM signal according to the comparison result.
Preferably, the error amplifying circuit comprises an error amplifier U1 and a compensation network; the forward input end of the error amplifier U1 is used as a first input end of the error amplifying circuit and is used for accessing a reference voltage, the reverse input end of the error amplifier U1 is used as a second input end of the error amplifying circuit after being connected with one end of the compensating network and is used for accessing the feedback voltage output by the power converter, and the output end of the error amplifier U1 is used as the output end of the error amplifying circuit after being connected with the other end of the compensating network.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a self-adaptation Burst threshold point regulating circuit is according to the switching power supply input voltage and the output voltage who gathers, the first voltage signal that output self-adaptation Burst threshold point function corresponds or adopt the look-up table method to look for the first voltage signal that the output corresponds, thereby can select different Burst threshold points according to different input voltage and input voltage, compare and export the comparative result that corresponds through real-time Comp voltage signal with Burst threshold point and error amplification circuit output, solve the great problem of the partial operating mode output ripple that single Burst comparative benchmark caused.
Drawings
Fig. 1 is a schematic diagram of the control circuit of the present invention;
fig. 2 is the utility model discloses an adaptive Burst threshold point regulating circuit.
Detailed Description
The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For the purpose of better illustrating the following embodiments, certain elements of the drawings may be omitted and may not represent actual circuit schematics; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted more likely. The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The conception of the application is as follows: the method comprises the steps that a digital controller is used for sampling input and output voltages, corresponding first voltage signals (namely Burst threshold points) are generated according to a preset self-adaptive Burst threshold function, or the corresponding Burst threshold points are searched by adopting a table look-up method, the output voltage signals of an error amplifier U1 are reduced along with the reduction of the load of a switching power supply, when the output voltage of the error amplifier U1 is smaller than the preset self-adaptive Burst threshold function or the Burst threshold points searched by adopting the table look-up method, a Burst comparator U3 outputs high level, a Burst control unit is controlled to enable, PWM signals of the switching power supply stop wave generation, therefore, the light self-adaptive Burst threshold control is achieved, and the light no-load ripple wave under the full working condition is controlled within a reasonable range.
Fig. 1 is the control circuit schematic diagram of the utility model, in this embodiment, a control circuit is provided, is applied to switching power supply, switching power supply is including the power converter, the converter the control unit that connect gradually, the converter the control unit includes error amplification circuit and Burst the control unit, control circuit includes: the self-adaptive Burst threshold point adjusting circuit comprises a self-adaptive Burst threshold point adjusting circuit and a Burst comparison circuit; the first input end of the self-adaptive Burst threshold point adjusting circuit is used for accessing the input voltage of the power converter, the second input end of the self-adaptive Burst threshold point adjusting circuit is used for accessing the output voltage of the power converter, and the output end of the self-adaptive Burst threshold point adjusting circuit is connected with the positive input end of a Burst comparator U3; the negative input end of the Burst comparator U3 is used for being connected with the output end of the error amplification circuit, and the output end of the Burst comparator U3 is used for being connected with the enabling end of the Burst control unit;
the self-adaptive Burst threshold point adjusting circuit is used for generating a corresponding first voltage signal according to the input voltage and the output voltage and outputting the first voltage signal to the positive input end of the Burst comparator U3;
the Burst comparator U3 is configured to compare the first voltage signal with the Comp voltage signal output by the error amplifying circuit, and output a comparison result to an enable terminal of the Burst control unit, so that the Burst control unit controls the sending of the PWM signal according to the comparison result.
Specifically, the input end of the power converter is connected to the first input end of the adaptive Burst threshold point adjusting circuit and the output end of the Burst control unit, and the output end of the power converter is connected to the second input end of the adaptive Burst threshold point adjusting circuit and the first input end of the error amplifying circuit; the output end of the self-adaptive Burst threshold point adjusting circuit is connected with the positive input end of a Burst comparator U3; the reverse input end of the Burst comparator U3 is connected with the output end of the error amplifying circuit; the first input end of the self-adaptive Burst threshold point adjusting circuit samples the input voltage of the power converter, the second input end samples the output voltage of the power converter, a first voltage signal is generated according to the input voltage and the output voltage, and the Burst comparator U3 is used for comparing the first voltage signal with a Comp voltage signal output by the error amplifying circuit and outputting a comparison result to an enabling end of the Burst control unit so that the Burst control unit controls the sending of the PWM signal according to the comparison result. Referring to fig. 1, U1 is an error amplifier in the error amplifying circuit, a positive input terminal of the error amplifier U1 is connected to a reference voltage Vref, a negative input terminal of the error amplifier U1 is simultaneously connected to the feedback input FB and one end of the compensation network, and an output terminal of the error amplifier U1 is simultaneously connected to the other end of the compensation network and an inverting input terminal of the Burst comparator U3. U2 is self-adaptation Burst threshold point regulating circuit, and input voltage is connected to the first input of self-adaptation Burst threshold point regulating circuit U2, and output voltage is connected to the second input of self-adaptation Burst threshold point regulating circuit U2, and the output of self-adaptation Burst threshold point regulating circuit U2 produces first voltage signal, and first voltage signal connection Burst comparator U3's positive input end.
Specifically, when the output load of the power converter is gradually reduced, the output of the error amplifier U1 is reduced, and when the output load of the power converter is reduced to a certain extent, the output voltage of the error amplifier U1 is smaller than the first voltage signal generated by the adaptive Burst threshold point adjusting circuit U2, that is, when the first voltage signal is greater than the Comp voltage signal, the Burst comparator U3 outputs a high-level comparison result to the enable end of the Burst control unit, so that the Burst control unit enables and stops the sending of the PWM signal; when the first voltage signal is smaller than the Comp voltage signal, the Burst comparator U3 outputs a low-level comparison result to an enable terminal of the Burst control unit, so that the Burst control unit is disabled and transmits a PWM signal; therefore, the output current of the light and no-load critical Burst of the switching power supply can be adaptively adjusted according to different input and output voltages, so that light and no-load output ripples of the switching power supply are reduced, and the switching power supply is particularly suitable for wide-voltage high-power switching power supplies.
As shown in fig. 2, which is a schematic diagram of the adaptive Burst threshold point adjusting circuit according to this embodiment, the adaptive Burst threshold point adjusting circuit includes: the digital controller comprises an input voltage sampling circuit, an output voltage sampling circuit and a digital controller U4;
the input end of the input voltage sampling circuit is used as the first input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the input voltage of the power converter, and the output end of the input voltage sampling circuit is connected with the first input end PA1 of the digital controller U4;
the input end of the output voltage sampling circuit is used as the second input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the output voltage of the power converter, and the output end of the output voltage sampling circuit is connected with the second input end of the digital controller U4 and is connected with PA0;
an output end PA2 of the digital controller U4 is used as an output end of the self-adaptive Burst threshold point adjusting circuit and is connected with a positive input end of a Burst comparator U3.
As a specific embodiment of the input voltage sampling circuit, the input voltage sampling circuit includes a resistor R1 and a resistor R2, one end of the resistor R1 is used as an input end of the input voltage sampling circuit, after the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is used as an output end of the input voltage sampling circuit, and the other end of the resistor R2 is connected with a power ground of the switching power supply.
As a specific embodiment of the output voltage sampling circuit, the output voltage sampling circuit includes a resistor R3 and a resistor R4, one end of the resistor R3 is used as an input end of the output voltage sampling circuit, after the other end of the resistor R3 is connected with one end of the resistor R4, the other end of the resistor R3 is used as an output end of the output voltage sampling circuit, and the other end of the resistor R3 is connected with a power ground of the switching power supply.
In order to realize that the digital controller U4 generates the corresponding Burst threshold point according to the input voltage and the output voltage, in this embodiment, a self-adaptive Burst threshold point function is generated in advance according to the fitting of the relationship between the plurality of input voltages, the plurality of output voltages and the Burst threshold point and is placed in the digital controller U4, so that the digital controller U4 can generate the corresponding first voltage signal according to the preset self-adaptive Burst threshold point function from the input voltage and the plurality of output voltages; or, generating an adaptive Burst threshold point lookup table in advance according to the relationship between a plurality of input voltages, output voltages and Burst threshold points and placing the adaptive Burst threshold point lookup table in the digital controller U4, so that the digital controller U4 can look up a corresponding first voltage signal in the preset adaptive Burst threshold point lookup table according to the input voltages and the output voltages; therefore, light and no-load self-adaptive Burst threshold control is realized, and light and no-load ripples under all working conditions are controlled within a reasonable range.
It should be noted that the above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as a limitation of the present invention, and it should be recognized that the present invention can be applied to other broader scope. According to the above-mentioned contents of the present invention, by using the common technical knowledge and conventional means in the field, the present invention can also make other modifications, replacements or changes in various forms without departing from the basic technical idea of the present invention, and these modifications, replacements or changes all fall within the protection scope of the present invention.
Claims (10)
1. A control circuit for controlling a light no-load state of a switching power supply, the switching power supply including a power converter, a converter control unit, the converter control unit including an error amplification circuit and a Burst control unit, the control circuit comprising: the self-adaptive Burst threshold point adjusting circuit comprises a self-adaptive Burst threshold point adjusting circuit and a Burst comparison circuit; the first input end of the self-adaptive Burst threshold point adjusting circuit is used for accessing the input voltage of the power converter, the second input end of the self-adaptive Burst threshold point adjusting circuit is used for accessing the output voltage of the power converter, and the output end of the self-adaptive Burst threshold point adjusting circuit is connected with the positive input end of a Burst comparator U3; the negative input end of the Burst comparator U3 is used for being connected with the output end of the error amplification circuit, and the output end of the Burst comparator U3 is used for being connected with the enabling end of the Burst control unit;
the self-adaptive Burst threshold point adjusting circuit is used for generating a corresponding first voltage signal according to the input voltage and the output voltage and outputting the first voltage signal to the positive input end of the Burst comparator U3;
the Burst comparator U3 is configured to compare the first voltage signal with the Comp voltage signal output by the error amplifying circuit, and output a comparison result to an enable terminal of the Burst control unit, so that the Burst control unit controls the PWM signal to be transmitted according to the comparison result.
2. The control circuit of claim 1, wherein the adaptive Burst threshold point adjustment circuit comprises: the digital controller comprises an input voltage sampling circuit, an output voltage sampling circuit and a digital controller U4;
the input end of the input voltage sampling circuit is used as the first input end of the self-adaptive Burst threshold point regulating circuit and is used for accessing the input voltage of the power converter, and the output end of the input voltage sampling circuit is connected with the first input end of the digital controller U4;
the input end of the output voltage sampling circuit is used as the second input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the output voltage of the power converter, and the output end of the output voltage sampling circuit is connected with the second input end of the digital controller U4;
the output end of the digital controller U4 is used as the output end of the self-adaptive Burst threshold point adjusting circuit and is connected with the positive input end of the Burst comparator U3.
3. The control circuit of claim 2, wherein the adaptive Burst threshold point adjustment circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and comprises: the input voltage sampling circuit collects input voltage of the power converter and outputs the input voltage to the digital controller U4, the output voltage sampling circuit collects output voltage of the power converter and outputs the output voltage to the digital controller U4, and the digital controller U4 generates corresponding first voltage signals according to preset self-adaptive Burst threshold point functions on the input voltage and the output voltage.
4. The control circuit of claim 2, wherein the adaptive Burst threshold point adjustment circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and comprises: the input voltage sampling circuit collects input voltage of the power converter and outputs the input voltage to the digital controller U4, the output voltage sampling circuit collects output voltage of the power converter and outputs the output voltage to the digital controller U4, and the digital controller U4 searches out a corresponding first voltage signal in a preset self-adaptive Burst threshold point lookup table according to the input voltage and the output voltage.
5. The control circuit of claim 1, wherein the Burst comparator U3 compares the first voltage signal with the Comp voltage signal output by the error amplifying circuit, and comprises:
when the first voltage signal is greater than the Comp voltage signal, the Burst comparator U3 outputs a comparison result of a high level to an enable terminal of the Burst control unit, so that the Burst control unit enables and stops the transmission of the PWM signal;
when the first voltage signal is less than the Comp voltage signal, the Burst comparator U3 outputs a low-level comparison result to the enable terminal of the Burst control unit, so that the Burst control unit is not enabled and transmits the PWM signal.
6. The control circuit according to any one of claims 2-4, wherein the input voltage sampling circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is used as the input end of the input voltage sampling circuit, the other end of the resistor R1 is connected with one end of the resistor R2 and then used as the output end of the input voltage sampling circuit, and the other end of the resistor R2 is connected with the power ground of the switching power supply.
7. The control circuit according to any one of claims 2-4, wherein the output voltage sampling circuit comprises a resistor R3 and a resistor R4, one end of the resistor R3 is used as the input end of the output voltage sampling circuit, the other end of the resistor R3 is connected with one end of the resistor R4 and then used as the output end of the output voltage sampling circuit, and the other end of the resistor R3 is connected with the power ground of the switching power supply.
8. A control circuit for controlling a light no-load state of a switching power supply, wherein the switching power supply comprises a power converter and a converter control unit which are connected in sequence, and the converter control unit comprises an error amplification circuit and a Burst control unit, and the control circuit comprises: the self-adaptive Burst threshold point adjusting circuit comprises a self-adaptive Burst threshold point adjusting circuit and a Burst comparison circuit;
the self-adaptive Burst threshold point adjusting circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a digital controller U4;
one end of the resistor R1 is used as a first input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the input voltage of the power converter, and the other end of the resistor R1 is connected with one end of the resistor R2 and a first input end of the digital controller U3; one end of the resistor R3 is used as a second input end of the self-adaptive Burst threshold point adjusting circuit and is used for accessing the output voltage of the power converter, and the other end of the resistor R3 is connected with one end of the resistor R4 and a second input end of the digital controller U4; the other end of the resistor R2 and the other end of the resistor R4 are connected with the power ground of the switching power supply; the output end of the digital controller U4 is used as the output end of the self-adaptive Burst threshold point adjusting circuit and is connected with the positive input end of the Burst comparator U3; and the reverse input end of the Burst comparator U3 is connected and used for being connected with the output end of the error amplification circuit, and the output end of the Burst comparator U3 is used for being connected with the enabling end of the Burst control unit.
9. A switching power supply comprising a power converter, a converter control unit and a control circuit according to any one of claims 1 to 8, wherein the converter control unit comprises an error amplification circuit and a Burst control unit connected in series; the input end of the power converter is connected with the first input end of the self-adaptive Burst threshold point adjusting circuit and the output end of the Burst control unit, and the output end of the power converter is connected with the second input end of the self-adaptive Burst threshold point adjusting circuit and the first input end of the error amplifying circuit; the output end of the self-adaptive Burst threshold point adjusting circuit is connected with the positive input end of a Burst comparator U3; the reverse input end of the Burst comparator U3 is connected with the output end of the error amplifying circuit; the first input end of the self-adaptive Burst threshold point adjusting circuit samples the input voltage of the power converter, the second input end samples the output voltage of the power converter, a first voltage signal is generated according to the input voltage and the output voltage, and the Burst comparator U3 is used for comparing the first voltage signal with a Comp voltage signal output by the error amplifying circuit and outputting a comparison result to the enabling end of the Burst control unit, so that the Burst control unit controls the sending of the PWM signal according to the comparison result.
10. The switching power supply according to claim 9, wherein the error amplifying circuit comprises an error amplifier U1, a compensation network; the forward input end of the error amplifier U1 is used as a first input end of the error amplifying circuit and is used for accessing a reference voltage, the reverse input end of the error amplifier U1 is used as a second input end of the error amplifying circuit after being connected with one end of the compensating network and is used for accessing the feedback voltage output by the power converter, and the output end of the error amplifier U1 is used as the output end of the error amplifying circuit after being connected with the other end of the compensating network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222219749.8U CN218733874U (en) | 2022-08-23 | 2022-08-23 | Control circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222219749.8U CN218733874U (en) | 2022-08-23 | 2022-08-23 | Control circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218733874U true CN218733874U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222219749.8U Active CN218733874U (en) | 2022-08-23 | 2022-08-23 | Control circuit and switching power supply |
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|---|---|
| CN (1) | CN218733874U (en) |
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- 2022-08-23 CN CN202222219749.8U patent/CN218733874U/en active Active
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