CN216016720U - Output voltage control circuit of switching power supply - Google Patents
Output voltage control circuit of switching power supply Download PDFInfo
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- CN216016720U CN216016720U CN202121397531.0U CN202121397531U CN216016720U CN 216016720 U CN216016720 U CN 216016720U CN 202121397531 U CN202121397531 U CN 202121397531U CN 216016720 U CN216016720 U CN 216016720U
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Abstract
The utility model discloses an output voltage control circuit of a switching power supply, which comprises a circuit input end, a voltage differential module, a voltage comparison module and a circuit output end, wherein the circuit input end is connected with the circuit differential module; the input end of the circuit is used for detecting the output voltage of the switching power supply; the output end of the circuit is used for being connected with the feedback voltage input end of the switching power supply; the input end of the voltage differential module is connected with the input end of the circuit, and the output end of the voltage differential module is connected with the first input end of the voltage comparison module; the second input end of the voltage comparison module is connected with the input end of the circuit, and the output end of the voltage comparison module is connected with the output end of the circuit. By adopting the technical scheme of the utility model, the output voltage of the switching power supply can be maintained to be stable by controlling the output voltage of the switching power supply when the load suddenly changes.
Description
Technical Field
The utility model relates to the technical field of power supply control, in particular to an output voltage control circuit of a switching power supply.
Background
With the development of science and technology, more and more electronic devices (such as notebook computers, tablet computers, mobile phones, wearable devices and the like) are applied to the daily life of people, and the electronic devices generally need to be powered by a power supply. At present, a common power supply is mainly a switching power supply, the switching power supply is a power supply which utilizes the modern power electronic technology to control the on-off time ratio of a switching tube and maintain stable output voltage, and the switching power supply mainly has the advantages of small volume, light weight, low power consumption, high efficiency and the like.
However, during the power supply process using the switching power supply, there may occur a sudden increase or a sudden decrease of the load, which may cause a sudden increase or a sudden decrease of the output voltage of the switching power supply, thereby causing the output voltage to be unstable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an output voltage control circuit of a switching power supply, which can maintain the stability of the output voltage of the switching power supply by controlling the output voltage of the switching power supply when the load suddenly changes.
In order to achieve the above purpose, the embodiment of the utility model adopts the following technical scheme: the output voltage control circuit of the switching power supply comprises a circuit input end, a voltage differential module, a voltage comparison module and a circuit output end;
the input end of the circuit is used for detecting the output voltage of the switching power supply; the output end of the circuit is used for being connected with the feedback voltage input end of the switching power supply;
the input end of the voltage differential module is connected with the input end of the circuit, and the output end of the voltage differential module is connected with the first input end of the voltage comparison module;
the second input end of the voltage comparison module is connected with the input end of the circuit, and the output end of the voltage comparison module is connected with the output end of the circuit.
Alternatively, the voltage differential module comprises a first operational amplifier, a first capacitor, a first resistor and a second resistor;
the first end of the first capacitor is connected with the input end of the voltage differential module, the second end of the first capacitor is connected with the inverting input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the output end of the voltage differential module;
a first end of the first resistor is connected with an output end of the first operational amplifier, and a second end of the first resistor is connected with an inverting input end of the first operational amplifier;
the first end of the second resistor is connected with the non-inverting input end of the first operational amplifier, and the second end of the second resistor is grounded.
As an alternative, the voltage differentiation module further includes a third resistor, a second capacitor, a third capacitor, a first zener diode, and a second zener diode;
the first end of the third resistor is connected with the input end of the voltage differential module, and the second end of the third resistor is connected with the first end of the first capacitor;
the first end of the second capacitor is connected with the first end of the first resistor, and the second end of the second capacitor is connected with the second end of the first resistor;
the first end of the third capacitor is connected with the first end of the second resistor, and the second end of the third capacitor is connected with the second end of the second resistor;
the cathode of the first voltage-stabilizing diode is connected with the first end of the first resistor, the anode of the first voltage-stabilizing diode is connected with the anode of the second voltage-stabilizing diode, and the cathode of the second voltage-stabilizing diode is connected with the second end of the first resistor.
Alternatively, the first resistor R1, the third resistor R3, the first capacitor C1 and the second capacitor C2 satisfy:
alternatively, the voltage comparison module comprises a second operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
a first end of the fourth resistor is connected with a first input end of the voltage comparison module, and a second end of the fourth resistor is connected with an inverting input end of the second operational amplifier;
a first end of the fifth resistor is connected with a second input end of the voltage comparison module, and a second end of the fifth resistor is connected with a non-inverting input end of the second operational amplifier;
a first end of the sixth resistor is connected with an inverting input end of the second operational amplifier, a second end of the sixth resistor is connected with an output end of the second operational amplifier, and an output end of the second operational amplifier is connected with an output end of the voltage comparison module;
and a first end of the seventh resistor is connected with a non-inverting input end of the second operational amplifier, and a second end of the seventh resistor is grounded.
Alternatively, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 satisfy: r4 ═ R5 ═ R6 ═ R7.
As an alternative, the circuit further comprises a voltage division module;
the input end of the voltage dividing module is used for being connected with the voltage output end of the switching power supply, the first output end of the voltage dividing module is connected with the input end of the circuit, and the second output end of the voltage dividing module is grounded.
Alternatively, the voltage dividing module comprises an eighth resistor and a ninth resistor;
the first end of the eighth resistor is connected with the input end of the voltage dividing module, and the second end of the eighth resistor is connected with the first output end of the voltage dividing module;
and the first end of the ninth resistor is connected with the second end of the eighth resistor, and the second end of the ninth resistor is connected with the second output end of the voltage dividing module.
As an alternative, the voltage division module further comprises a fourth capacitor;
and the first end of the fourth capacitor is connected with the first end of the eighth resistor, and the second end of the fourth capacitor is connected with the second end of the eighth resistor.
Alternatively, the fifth resistor R5, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 satisfy:
where Uref denotes a feedback reference voltage of the switching power supply and Udc denotes an output voltage of the switching power supply.
Compared with the prior art, the embodiment of the utility model provides an output voltage control circuit of a switching power supply, which comprises a circuit input end, a voltage differential module, a voltage comparison module and a circuit output end, wherein the circuit input end is used for detecting the output voltage of the switching power supply; the output end of the circuit is used for being connected with the feedback voltage input end of the switching power supply; the input end of the voltage differential module is connected with the input end of the circuit, and the output end of the voltage differential module is connected with the first input end of the voltage comparison module; the second input end of the voltage comparison module is connected with the input end of the circuit, and the output end of the voltage comparison module is connected with the output end of the circuit; the output voltage control circuit can maintain the stability of the output voltage of the switching power supply by controlling the output voltage of the switching power supply when the load suddenly changes.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of an output voltage control circuit of a switching power supply provided in the present invention;
fig. 2 is a schematic circuit diagram of a preferred embodiment of an output voltage control circuit of a switching power supply according to the present invention;
fig. 3 is a schematic structural diagram of another preferred embodiment of an output voltage control circuit of a switching power supply provided by the present invention;
fig. 4 is a schematic circuit diagram of another preferred embodiment of the output voltage control circuit of the switching power supply provided by the present invention;
fig. 5 is an application circuit diagram of an output voltage control circuit of a switching power supply provided by the utility model.
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 any inventive step, are within the scope of the present invention.
An embodiment of the present invention provides an output voltage control circuit of a switching power supply, and is a schematic structural diagram of a preferred embodiment of the output voltage control circuit of the switching power supply, as shown in fig. 1, where the circuit includes a circuit input terminal Vin, a voltage differentiation module 100, a voltage comparison module 200, and a circuit output terminal Vout;
the circuit input end Vin is used for detecting the output voltage of the switching power supply; the circuit output end Vout is used for connecting a feedback voltage input end of the switching power supply;
the input end of the voltage differential module 100 is connected with the circuit input end Vin, and the output end of the voltage differential module 100 is connected with the first input end of the voltage comparison module;
a second input terminal of the voltage comparison module 200 is connected to the circuit input terminal Vin, and an output terminal of the voltage comparison module 200 is connected to the circuit output terminal Vout.
Specifically, the output voltage control circuit mainly comprises a circuit input end Vin, a voltage differential module 100, a voltage comparison module 200 and a circuit output end Vout, and in practical application, the output voltage control circuit detects the magnitude of the output voltage of a controlled switching power supply (such as a DC power chip) through the circuit input end Vin, differentiates the detected output voltage through the voltage differential module 100 to obtain a differential signal of the output voltage, and reflects the variation of the output voltage in time, and because the voltage differential module 100 obtains the opposite number of the differential signal, the voltage comparison module 200 further processes the differential signal of the output voltage according to the detected output voltage to suppress the output common mode voltage, and finally feeds back the processed differential signal to the feedback voltage input end of the controlled switching power supply through the circuit output end Vout, the switching power supply can quickly respond to the change condition of the output voltage according to the received feedback signal, and the control of the output voltage is realized.
As can be understood, the output voltage control circuit feeds back not only the output voltage but also a differential amount of the output voltage to the switching power supply; when the output voltage of the switching power supply is stable, the differential quantity of the output voltage is 0, and the output voltage control circuit has a function similar to that of a feedback circuit of a common switching power supply; when the load of the switching power supply suddenly changes to cause the output voltage to change, the differential quantity of the output voltage is not 0, the output voltage control circuit can introduce the differential quantity of the output voltage into a feedback loop, and the control quantity after the differential quantity is different from the standard voltage in the switching power supply can be increased, so that the power output is accelerated, the rapid balance of the input power and the output power of the switching power supply is achieved, and the stability of the output voltage of the switching power supply is maintained.
Referring to fig. 2, which is a schematic circuit diagram of a preferred embodiment of an output voltage control circuit of a switching power supply provided in the present invention, as an improvement of the foregoing, the voltage differentiation module 100 includes a first operational amplifier U1, a first capacitor C1, a first resistor R1, and a second resistor R2;
a first end of the first capacitor C1 is connected to the input end of the voltage differentiation module 100, a second end of the first capacitor C1 is connected to the inverting input end of the first operational amplifier U1, and the output end of the first operational amplifier U1 is connected to the output end of the voltage differentiation module 100;
a first end of the first resistor R1 is connected with an output end of the first operational amplifier U1, and a second end of the first resistor R1 is connected with an inverting input end of the first operational amplifier U1;
the first end of the second resistor R2 is connected with the non-inverting input end of the first operational amplifier U1, and the second end of the second resistor R2 is grounded.
Specifically, in combination with the above embodiment, the voltage differentiating module 100 mainly comprises the first operational amplifier U1, the first capacitor C1, the first resistor R1 and the second resistor R2, and is essentially a differentiating operational circuit, and the detected output voltage of the switching power supply can be converted into a differential signal by the voltage differentiating module 100 according to the operation principle of the differentiating operational circuit.
As a modification of the above scheme, with reference to fig. 2, the voltage differential module 100 further includes a third resistor R3, a second capacitor C2, a third capacitor C3, a first zener diode D1, and a second zener diode D2;
a first end of the third resistor R3 is connected to the input terminal of the voltage differentiation module 100, and a second end of the third resistor R3 is connected to a first end of the first capacitor C1;
a first end of the second capacitor C2 is connected with a first end of the first resistor R1, and a second end of the second capacitor C2 is connected with a second end of the first resistor R1;
a first end of the third capacitor C3 is connected with a first end of the second resistor R2, and a second end of the third capacitor C3 is connected with a second end of the second resistor R2;
a cathode of the first zener diode D1 is connected to the first end of the first resistor R1, an anode of the first zener diode D1 is connected to an anode of the second zener diode D2, and a cathode of the second zener diode D2 is connected to the second end of the first resistor R1.
Specifically, in combination with the above embodiment, the voltage differentiation module 100 further includes a third resistor R3, a second capacitor C2, a third capacitor C3, a first zener diode D1, and a second zener diode D2, wherein the third resistor R3 connected in series to the inverting input terminal of the first operational amplifier U1 can limit the input current, and accordingly limit the current flowing through the first resistor R1; the first resistor R1 is connected with the first voltage stabilizing diode D1 and the second voltage stabilizing diode D2 in parallel, so that the amplitude of output voltage can be limited, an amplifying tube in the first operational amplifier U1 is ensured to work in an amplifying region all the time, and the blocking phenomenon is avoided; the second capacitor C2 with small capacity is connected in parallel with the first resistor R1, so that the phase compensation effect can be achieved, and the stability of the circuit can be improved.
It should be noted that, in practical applications, the differential signal is relatively difficult to obtain and is generally interfered by noise, the differential signal corresponding to the noise masks the differential of the useful signal (i.e., the output voltage of the switching power supply), and the output voltage ripple of the switching power supply also affects the differential signal. In order to avoid the influence of noise and voltage ripple on the differential signal, it is necessary to select ω, which is not greater than 1/10 of the switching frequency, so that the voltage ripple mainly plays roles of the third resistor R3 and the second capacitor C2 when passing through the voltage differential module 100, and since the first capacitor C1 and the second capacitor C2 are equivalent to short circuit to ac at the voltage ripple frequency, the voltage differential module 100 can be degraded to an inverting proportional amplifier circuit, and the second capacitor C2 is equivalent to short circuit, so that the amplification factor is approximately equal to 0, and the influence of noise and voltage ripple on the differential signal can be suppressed.
As a modification of the above scheme, the first resistor R1, the third resistor R3, the first capacitor C1 and the second capacitor C2 satisfy:
specifically, in combination with the above embodiment, the following relationship is satisfied among the resistance value of the first resistor R1, the resistance value of the third resistor R3, the capacitance value of the first capacitor C1, and the capacitance value of the second capacitor C2:
in practical applications, R3 × C1 ≈ R1 × C2 is typically selected and used
As described above, in the frequency range of normal operation, the voltage differentiation module 100 can reduce the influence of the third resistor R3 and the second capacitor C2 on the differentiated signal in the normal frequency band; in the high frequency band, the second capacitor C2 is equivalent to a short circuit, the first operational amplifier U1 has no amplification effect (the amplification factor is about 0) on the high frequency signal, and the third resistor R3 and the second resistor RThe capacitor C2 reduces the voltage amplification factor, and can effectively inhibit the influence of noise and voltage ripple on differential signals; in the low frequency band, due to
The first resistor R1 and the first capacitor C1 mainly function, namely, a classical differential operation circuit is formed, and the transfer function in a low frequency band is G(s) -sR1C1 according to the working principle of the classical differential operation circuit, so that the size of a fed-back differential signal can be correspondingly adjusted by adjusting the sizes of the first resistor R1 and the first capacitor C1.
As a modification of the above scheme, the voltage comparison module 200 includes a second operational amplifier U2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7, as shown in fig. 2;
a first end of the fourth resistor R4 is connected to the first input end of the voltage comparison module 200, and a second end of the fourth resistor R4 is connected to the inverting input end of the second operational amplifier U2;
a first end of the fifth resistor R5 is connected to the second input end of the voltage comparison module 200, and a second end of the fifth resistor R5 is connected to the non-inverting input end of the second operational amplifier U2;
a first end of the sixth resistor R6 is connected to an inverting input terminal of the second operational amplifier U2, a second end of the sixth resistor R6 is connected to an output terminal of the second operational amplifier U2, and an output terminal of the second operational amplifier U2 is connected to an output terminal of the voltage comparison module 200;
the first end of the seventh resistor R7 is connected to the non-inverting input terminal of the second operational amplifier U2, and the second end of the seventh resistor R7 is grounded.
Optionally, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 satisfy: r4 ═ R5 ═ R6 ═ R7.
Specifically, in combination with the above embodiment, the voltage comparing module 200 mainly includes the second operational amplifier U2, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, and is essentially a differential proportional operational circuit, and the resistance of the fourth resistor R4, the resistance of the fifth resistor R5, the resistance of the sixth resistor R6 and the resistance of the seventh resistor R7 satisfy the following relationships: as can be seen from the operating principle of the differential proportional operation circuit, the voltage comparison module 200 can perform corresponding processing on the detected output voltage of the switching power supply and the differential signal of the output voltage, so as to suppress the output common mode voltage.
Referring to fig. 3, it is a schematic structural diagram of another preferred embodiment of the output voltage control circuit of the switching power supply provided in the present invention, in another alternative embodiment, the circuit further includes a voltage dividing module 300;
the input end of the voltage dividing module 300 is used for connecting a voltage output end Udc of a switching power supply, the first output end of the voltage dividing module 300 is connected with the circuit input end Vin, and the second output end of the voltage dividing module 300 is grounded.
Specifically, in combination with the above embodiment, the output voltage control circuit further includes a voltage dividing module 300, and the voltage dividing module 300 is connected between the circuit input terminal Vin and the voltage output terminal Udc of the controlled switching power supply, and can be used to detect the output voltage Udc of the switching power supply.
Referring to fig. 4, which is a schematic circuit diagram of another preferred embodiment of the output voltage control circuit of the switching power supply provided by the present invention, as an improvement of the foregoing solution, the voltage dividing module 300 includes an eighth resistor R8 and a ninth resistor R9;
a first end of the eighth resistor R8 is connected to the input end of the voltage divider module 300, and a second end of the eighth resistor R8 is connected to the first output end of the voltage divider module 300;
a first end of the ninth resistor R9 is connected to the second end of the eighth resistor R8, and a second end of the ninth resistor R9 is connected to the second output terminal of the voltage divider module 300.
Specifically, in combination with the above embodiment, the voltage dividing module 300 mainly includes the eighth resistor R8 and the ninth resistor R9, the eighth resistor R8 and the ninth resistor R9 constitute a voltage dividing circuit, and the input terminal Vin of the circuit can obtain the output voltage Udc of the switching power supply by detecting the divided voltage magnitude corresponding to the ninth resistor R9.
As a modification of the above scheme, as shown in fig. 4, the voltage dividing module 300 further includes a fourth capacitor C4;
a first terminal of the fourth capacitor C4 is connected to a first terminal of the eighth resistor R8, and a second terminal of the fourth capacitor C4 is connected to a second terminal of the eighth resistor R8.
Optionally, the fifth resistor R5, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 satisfy:
where Uref denotes a feedback reference voltage of the switching power supply and Udc denotes an output voltage of the switching power supply.
Specifically, in combination with the above embodiments, in practical applications, when the voltage differential module 100 and the voltage comparison module 200 are not added to the feedback network of the switching power supply, only the voltage dividing module 300 is used as a voltage dividing network; when the voltage differentiating module 100 and the voltage comparing module 200 are added to the feedback network of the switching power supply, the voltage dividing network is formed by the fifth resistor R5, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9, the fifth resistor R5 and the seventh resistor R7 are connected in series, then connected in parallel with the ninth resistor R9, and finally connected with the eighth resistor R8 to divide the output voltage Udc of the switching power supply, so that the voltage differentiating module 100 and the voltage comparing module 200 will affect the voltage dividing module 300 in practical application, and therefore the resistance of the fifth resistor R5, the resistance of the seventh resistor R7, the resistance of the eighth resistor R8 and the resistance of the ninth resistor R9 need to satisfy the following relations:
where Uref denotes a feedback reference voltage inside the controlled switching power supply, and Udc denotes an output voltage of the controlled switching power supply.
Referring to fig. 5, a switching power supply provided by the present inventionThe output voltage control circuit of (1) is an applied circuit diagram of an output voltage control circuit, the switching power supply supplies power to the load through an output inductor L0 and an output capacitor C0, the output voltage control circuit is used as a feedback network of the switching power supply and is connected between a voltage output end Udc and a feedback voltage input end FB of the switching power supply, and as can be seen from the above embodiment, the input and output transfer function corresponding to the voltage dividing module 300 is as follows
The transfer function corresponding to the voltage differentiating module 100 is-sR 1C1, and after passing through the voltage comparing module 200, the transfer function corresponding to the voltage received by the output voltage of the switching power supply to the feedback voltage input end of the switching power supply is
Therefore, the magnitude of the fed-back differential signal can be adjusted by selecting the appropriate differential parameters of the first resistor R1 and the first capacitor C1, so as to ensure the coordination of rapidity and stability of output voltage control when the load of the switching power supply suddenly changes.
It can be understood that the increase of the first resistor R1 and the first capacitor C1 increases the obtained differential signal, and accordingly increases the response speed of the control system, but if the response is too fast, overshoot occurs and even the system is unstable, and the stability and the rapidity of the control system are contradictory, so that the values of the first resistor R1 and the first capacitor C1 can be determined in the debugging process according to actual needs.
To sum up, the output voltage control circuit of the switching power supply according to the embodiments of the present invention can increase the response speed of the control system by introducing feedback to the output voltage of the switching power supply and the differential signal of the output voltage at the same time, so as to correspondingly increase the power output of the switching power supply, and fundamentally suppress the output voltage drop phenomenon caused by sudden load change, so that when the load suddenly changes, the output voltage of the switching power supply is controlled to maintain the stability of the output voltage of the switching power supply, and in addition, the magnitude of the feedback differential signal can be adjusted according to the magnitude of the differential parameter, so as to ensure the coordination of rapidity and stability of the output voltage control when the load suddenly changes.
The above description is only an alternative embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. An output voltage control circuit of a switching power supply is characterized by comprising a circuit input end, a voltage differential module, a voltage comparison module and a circuit output end;
the input end of the circuit is used for detecting the output voltage of the switching power supply; the output end of the circuit is used for being connected with the feedback voltage input end of the switching power supply;
the input end of the voltage differential module is connected with the input end of the circuit, and the output end of the voltage differential module is connected with the first input end of the voltage comparison module;
the second input end of the voltage comparison module is connected with the input end of the circuit, and the output end of the voltage comparison module is connected with the output end of the circuit.
2. The output voltage control circuit of the switching power supply according to claim 1, wherein the voltage differential module includes a first operational amplifier, a first capacitor, a first resistor, and a second resistor;
the first end of the first capacitor is connected with the input end of the voltage differential module, the second end of the first capacitor is connected with the inverting input end of the first operational amplifier, and the output end of the first operational amplifier is connected with the output end of the voltage differential module;
a first end of the first resistor is connected with an output end of the first operational amplifier, and a second end of the first resistor is connected with an inverting input end of the first operational amplifier;
the first end of the second resistor is connected with the non-inverting input end of the first operational amplifier, and the second end of the second resistor is grounded.
3. The output voltage control circuit of the switching power supply according to claim 2, wherein the voltage differentiation module further comprises a third resistor, a second capacitor, a third capacitor, a first zener diode and a second zener diode;
the first end of the third resistor is connected with the input end of the voltage differential module, and the second end of the third resistor is connected with the first end of the first capacitor;
the first end of the second capacitor is connected with the first end of the first resistor, and the second end of the second capacitor is connected with the second end of the first resistor;
the first end of the third capacitor is connected with the first end of the second resistor, and the second end of the third capacitor is connected with the second end of the second resistor;
the cathode of the first voltage-stabilizing diode is connected with the first end of the first resistor, the anode of the first voltage-stabilizing diode is connected with the anode of the second voltage-stabilizing diode, and the cathode of the second voltage-stabilizing diode is connected with the second end of the first resistor.
4. The output voltage control circuit of claim 3, wherein the first resistor R1, the third resistor R3, the first capacitor C1 and the second capacitor C2 satisfy:
5. the output voltage control circuit of the switching power supply according to claim 1, wherein the voltage comparison module includes a second operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;
a first end of the fourth resistor is connected with a first input end of the voltage comparison module, and a second end of the fourth resistor is connected with an inverting input end of the second operational amplifier;
a first end of the fifth resistor is connected with a second input end of the voltage comparison module, and a second end of the fifth resistor is connected with a non-inverting input end of the second operational amplifier;
a first end of the sixth resistor is connected with an inverting input end of the second operational amplifier, a second end of the sixth resistor is connected with an output end of the second operational amplifier, and an output end of the second operational amplifier is connected with an output end of the voltage comparison module;
and a first end of the seventh resistor is connected with a non-inverting input end of the second operational amplifier, and a second end of the seventh resistor is grounded.
6. The output voltage control circuit of the switching power supply according to claim 5, wherein the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 satisfy: r4 ═ R5 ═ R6 ═ R7.
7. The output voltage control circuit of the switching power supply according to claim 5, wherein the circuit further comprises a voltage dividing module;
the input end of the voltage dividing module is used for being connected with the voltage output end of the switching power supply, the first output end of the voltage dividing module is connected with the input end of the circuit, and the second output end of the voltage dividing module is grounded.
8. The output voltage control circuit of the switching power supply according to claim 7, wherein the voltage dividing module includes an eighth resistor and a ninth resistor;
the first end of the eighth resistor is connected with the input end of the voltage dividing module, and the second end of the eighth resistor is connected with the first output end of the voltage dividing module;
and the first end of the ninth resistor is connected with the second end of the eighth resistor, and the second end of the ninth resistor is connected with the second output end of the voltage dividing module.
9. The output voltage control circuit of the switching power supply according to claim 8, wherein the voltage dividing module further includes a fourth capacitor;
and the first end of the fourth capacitor is connected with the first end of the eighth resistor, and the second end of the fourth capacitor is connected with the second end of the eighth resistor.
10. The output voltage control circuit of the switching power supply of claim 8, wherein the fifth resistor R5, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 satisfy:
where Uref denotes a feedback reference voltage of the switching power supply and Udc denotes an output voltage of the switching power supply.
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| CN202121397531.0U CN216016720U (en) | 2021-06-22 | 2021-06-22 | Output voltage control circuit of switching power supply |
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| CN202121397531.0U CN216016720U (en) | 2021-06-22 | 2021-06-22 | Output voltage control circuit of switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505508A (en) * | 2023-06-26 | 2023-07-28 | 深圳市力生美半导体股份有限公司 | Power management method, device, equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505508A (en) * | 2023-06-26 | 2023-07-28 | 深圳市力生美半导体股份有限公司 | Power management method, device, equipment and storage medium |
| CN116505508B (en) * | 2023-06-26 | 2023-09-19 | 深圳市力生美半导体股份有限公司 | Power management method, device, equipment and storage medium |
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