CN216356513U - Off-line switching power supply circuit and feedback control chip thereof - Google Patents
Off-line switching power supply circuit and feedback control chip thereof Download PDFInfo
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- CN216356513U CN216356513U CN202122267755.6U CN202122267755U CN216356513U CN 216356513 U CN216356513 U CN 216356513U CN 202122267755 U CN202122267755 U CN 202122267755U CN 216356513 U CN216356513 U CN 216356513U
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Abstract
An off-line switching power supply circuit and a feedback control chip thereof are provided. In the feedback control chip, the feedback loop control module comprises an output voltage detection unit, an output voltage feedback loop transconductance error amplifier, an output voltage feedback loop compensation circuit and an output voltage feedback loop optical coupler drive circuit, wherein a first terminal of the output voltage detection unit is connected to an output voltage detection pin, a second terminal of the output voltage feedback loop transconductance error amplifier is connected to a first terminal of the output voltage feedback loop transconductance error amplifier, a third terminal of the output voltage feedback loop transconductance error amplifier is connected to a second terminal of the output voltage feedback loop transconductance error amplifier and grounded, a third terminal of the output voltage feedback loop transconductance error amplifier is connected to a first terminal of the output voltage feedback loop compensation circuit and a first terminal of the output voltage feedback loop optical coupler drive circuit, a second terminal of the output voltage feedback loop compensation circuit is grounded, a second terminal of the output voltage feedback loop optical coupler drive circuit is grounded, a voltage feedback loop optical coupler drive circuit is connected to a first terminal of the output voltage feedback loop optical coupler drive circuit, a feedback loop optical coupler drive circuit is connected to a second terminal of the output voltage feedback loop optical coupler drive circuit, and a feedback loop optical coupler drive circuit is connected to a second terminal of the output voltage feedback loop optical coupler drive circuit, The third terminal is connected to the optocoupler drive pin.
Description
Technical Field
The utility model relates to the field of integrated circuits, in particular to an off-line switching power supply circuit and a feedback control chip thereof.
Background
In recent years, as screens of mobile devices such as smartphones, tablet computers, notebook computers become larger and processor speeds become faster, power consumption of the mobile devices becomes large. In order to meet the standby time requirements of mobile devices for users, the capacity of the power supply battery of the mobile device is increasing. In order to reduce the charging time of the power supply battery of the mobile device, the charging power of the mobile device is increased accordingly. However, limited by the physical limitations of the maximum current of the Universal Serial Bus (USB), the charger can only provide greater charging power to the mobile device by increasing the output voltage.
The USB association is striving towards universal chargers, i.e. chargers of this kind can charge devices with various different charging power requirements. In the prior art, the feedback control chip of the alternating current/direct current (AC/DC) switching power supply circuit used as the charger has more pins, more peripheral compensation components and the like, so that the requirement of miniaturization cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of one or more of the above-mentioned problems, the present invention provides an off-line switching power supply circuit and a feedback control chip thereof.
The feedback control chip for the off-line switching power supply circuit comprises an output voltage detection pin, an optical coupler driving pin and a feedback loop control module, wherein: the feedback loop control module comprises an output voltage detection unit, an output voltage feedback loop transconductance error amplifier, an output voltage feedback loop compensation circuit and an output voltage feedback loop optical coupling driving circuit, the first terminal of the output voltage detection unit is connected to the output voltage detection pin, the second terminal of the output voltage feedback loop transconductance error amplifier is connected to the first terminal of the output voltage feedback loop transconductance error amplifier, the third terminal of the output voltage feedback loop transconductance error amplifier is connected to the second terminal of the output voltage feedback loop transconductance error amplifier and grounded, the third terminal of the output voltage feedback loop transconductance error amplifier is connected to the first terminal of the output voltage feedback loop compensation circuit and the first terminal of the output voltage feedback loop optical coupling driving circuit, the second terminal of the output voltage feedback loop compensation circuit is grounded, the second terminal of the output voltage feedback loop optical coupling driving circuit is grounded, and the third terminal of the output voltage feedback loop optical coupling driving circuit is connected to the optical coupling driving pin.
The off-line switching power supply circuit according to the embodiment of the utility model comprises the feedback control chip for the off-line switching power supply circuit.
According to the off-line switch power supply circuit and the feedback control chip thereof, the complete feedback loop is integrated in the feedback control chip, so that the pin number and the peripheral device number of the feedback control chip can be reduced, the system integration level can be improved, the system components are saved, and the miniaturization of the system is facilitated.
Drawings
The utility model may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic diagram of a conventional off-line switching power supply circuit;
fig. 2 shows an exemplary schematic structural diagram of an off-line switching power supply circuit according to an embodiment of the present invention;
FIG. 3 illustrates an example pin layout diagram of a feedback control chip according to an embodiment of the utility model;
fig. 4A to 4C are schematic diagrams illustrating exemplary structures of a feedback control chip according to an embodiment of the present invention;
fig. 5A to 5C are schematic diagrams illustrating exemplary structures of feedback loop control modules in a feedback control chip according to an embodiment of the present invention;
FIG. 6 illustrates an example circuit implementation of the output voltage discharge cell shown in FIG. 5A;
fig. 7 illustrates an example circuit implementation of the output wire voltage drop compensation unit shown in fig. 5A.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration set forth below, but rather covers any modification, substitution, and improvement of elements and components without departing from the spirit of the utility model. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention. Note that, the term "a and B are connected" as used herein may mean "a and B are directly connected" or "a and B are indirectly connected via one or more other elements".
Fig. 1 shows a schematic diagram of a conventional off-line switching power supply circuit 100. As shown in fig. 1, in order to meet the requirement of an off-line switching power supply circuit 100 such as a general charger for an adjustable output voltage and an adjustable output current, the feedback control chip 102 requires at least 10 pins. If the miniaturization of the feedback control chip 102 is to be maintained, relatively expensive packages such as SSOP10/QFN16 must be used. Meanwhile, the feedback loop compensation devices (e.g., capacitors C1-C4 and resistors R1-R2, etc.) at the periphery of the feedback control chip 102 are very many, which makes the off-line switching power supply circuit 100 have poor system reliability, high cost, and difficulty in miniaturization.
In view of the problems of the conventional off-line switching power supply circuit and the feedback control chip thereof, the off-line switching power supply circuit and the feedback control chip thereof according to the embodiment of the utility model are provided.
Fig. 2 shows an exemplary schematic structure diagram of an off-line switching power supply circuit 200 according to an embodiment of the present invention. As can be seen from fig. 1 and 2, in the off-line switching power supply circuit 200, the feedback loop compensation device is integrated into the feedback control chip 202, the feedback control chip 202 has fewer voltage feedback pins VFB and current feedback pins IFB than the feedback control chip 102, the number of basic functional pins is only 8, and the most common inexpensive package such as SOP8 can be adopted.
In addition, since the feedback control chip 202 is integrated with a complete feedback loop, one or more functions related to the feedback loop, such as an output voltage feedback control function, an output current feedback control function, an output wire voltage drop compensation function, an output voltage dynamic enhancement function, an optical coupler driving maximum current clamping function, a chip soft start function, an output voltage/current soft switching function, a function of discharging an output capacitor during output voltage switching, and the like, may be additionally added inside the feedback control chip 202. Meanwhile, the feedback control chip 202 may additionally add one or more protection functions of the secondary side output, for example, an overvoltage protection (OVP) function, an undervoltage protection (UVP) function, an overcurrent protection (OCP) function, an overload protection (OLP) function, and the like.
Fig. 3 shows an example pin layout diagram of feedback control chip 202, according to an embodiment of the present invention. As can be seen in conjunction with fig. 2 and 3, the feedback control chip 202 includes the following pins:
and a current detection positive pin ISP (inverse discrete cosine transformer) connected to an output current sampling resistor (for example, Rs) and used for realizing output current feedback control and OCP (open reactive Power) control.
And a current detection negative pin ISN connected to an output current sampling resistor (for example, Rs) for realizing output current feedback control and OCP control.
The output voltage detection pin Vo is connected to the positive electrode of the output capacitor (e.g., Co) and is used for realizing output voltage feedback control and discharge control in the output voltage switching process.
And the optocoupler driving pin OPTO is connected to a cathode of the optocoupler diode and used for controlling the current flowing through the optocoupler, so that the control of a system loop is realized. Specifically, the magnitude of the current flowing through the optocoupler is controlled by an optocoupler drive circuit built in the feedback control chip 202. The anode of the optocoupler may be connected to the output voltage via a resistor (e.g., Ropto) or may be directly connected to the output voltage.
The chip reference ground pin GND is connected to the cathode of an output capacitor (e.g., Co) or the negative voltage terminal of a load (e.g., Ro).
And the load switch driving pin Gate is connected to the grid electrode of the load switch and is used for controlling the on and off of the load switch. In fig. 2, an NMOS transistor is used as the load switch, and the load switch is provided at the positive terminal of the system output. In fact, the load switch is not limited to the NMOS transistor, and a PMOS transistor or the like may be used. In addition, the load switch may be provided at the negative terminal of the system output. In some applications, the output voltage does not need to be directly connected to the load via the load switch, and the load switch driving pin Gate may remain floating, be grounded via a resistor, or be directly grounded.
The protocol communication port pins DP/CC1 and DN/CC2 can support the Quick Charge (QC) protocol or the power transmission (PD) protocol through internal switching. However, the protocol communication port pins can support other communication protocols, not only QC or PD protocols. In practical application, the number of pins of the protocol communication port can be increased to meet the communication protocol requirement of the system.
It should be noted that the feedback control chip 202 is not limited to include 8 pins, but may include a smaller or larger number of pins depending on the actual system application. For example, the feedback control chip 202 may further include one or more general purpose input output pins GPIO.
In some embodiments, the feedback control chip 202 may be applied in an output voltage feedback and output current feedback system. Fig. 4A shows an exemplary structure diagram of the feedback control chip 202-1 applied in an output voltage feedback or output current feedback system according to an embodiment of the present invention. As shown in fig. 4A, the feedback control chip 202-1 includes an under-voltage lockout and low dropout (UVLO/LDO) discharge module 2022, a digital control module 2024 (e.g., a micro control unit), a protocol communication module 2026, an output voltage current protection control module 2028, an output voltage discharge control module 2030, an output voltage and output current feedback loop control module 2032-1, and a load switch driving module 2034, wherein: the UVLO/LDO discharge module 2022 has one end connected to the output voltage detection pin Vo and the other end connected to the digital control module 2024, the protocol communication module 2026 has first and second ends connected to the protocol communication port pins DP/CC1 and DN/CC2, respectively, and a third end connected to the digital control module 2024, the output voltage current protection control module 2028 is connected to the digital control module 2024, the output voltage discharge control module 2030 is connected to the digital control module 2024, the output voltage and output current feedback loop control module 2032-1 is connected to the current detection positive pin ISP, the current detection negative pin ISN, and the optical coupling driving pin OPTO and connected to the digital control module 2024, and the load switch driving module 2034 has one end connected to the load switch driving pin Gate and the other end connected to the digital control module 2024.
In some embodiments, the feedback control chip 202 may also be applied in an output-only voltage feedback system. Fig. 4B is a schematic diagram illustrating an exemplary structure of the feedback control chip 202-2 applied in the output voltage feedback system according to the embodiment of the utility model. Feedback control chip 202-2 differs from feedback control chip 202-1 by including an output voltage feedback loop control module 2032-2 instead of an output voltage and output current feedback loop control module 2032-1. Other aspects of the feedback control chip 202-2 are the same as the feedback control chip 202-1, and are not described in detail herein.
In some embodiments, the feedback control chip 202 may also be applied in an output current feedback system. Fig. 4C is a schematic diagram illustrating an exemplary structure of the feedback control chip 202-3 applied in the output current feedback system according to an embodiment of the present invention. Feedback control chip 202-3 differs from feedback control chip 202-1 by including output current feedback loop control module 2032-3 instead of output voltage and output current feedback loop control module 2032-1. Other aspects of the feedback control chip 202-3 are the same as the feedback control chip 202-1 and will not be described herein.
Fig. 5A illustrates an exemplary structure diagram of the output voltage and output current feedback loop control module 2032-1 according to an embodiment of the utility model. As shown in fig. 5A, the output voltage and output current feedback loop control module 2032-1 includes an output voltage detection unit 502, an output voltage feedback loop transconductance error amplifier 504, an output voltage feedback loop compensation circuit 506, an output voltage feedback loop optical coupler driving circuit 508, an output voltage feedback loop optical coupler driving isolation diode 510, an output current sampling and amplifying unit 512, an output current feedback loop transconductance error amplifier 514, an output current feedback loop compensation circuit 516, an output current feedback loop optical coupler driving circuit 518, and an output current feedback loop optical coupler driving isolation diode 520.
As shown in fig. 5A, a first terminal of the output voltage detection unit 502 is connected to the output voltage detection pin Vo, a second terminal is connected to a first terminal of the output voltage feedback loop transconductance error amplifier 504, and a third terminal is connected to a second terminal of the output voltage feedback loop transconductance error amplifier 504 and grounded; a third terminal of the output voltage feedback loop transconductance error amplifier 504 is connected to a first terminal of an output voltage feedback loop compensation line 506 and a first terminal of an output voltage feedback loop opto-coupler drive line 508; the second terminal of the output voltage feedback loop compensation line 506 is connected to ground; a second terminal of the output voltage feedback loop optocoupler drive line 508 is grounded, and a third terminal is connected to a first terminal of an output voltage feedback loop optocoupler drive isolation diode 510; the second terminal of the output voltage feedback loop OPTO-coupler drive isolation diode 510 is connected to the OPTO-coupler drive pin OPTO.
As shown in fig. 5A, the output current sampling and amplifying unit 512 has a first terminal connected to the output current detection positive pin ISP, a second terminal connected to the output current detection negative pin ISN, and a third terminal connected to the first terminal of the output current feedback loop transconductance error amplifier 514; a second terminal of the output current feedback loop transconductance error amplifier 514 is connected to ground, a third terminal is connected to a first terminal of an output current feedback loop compensation line 516, and a first terminal of an output current feedback loop opto-coupler drive line 518; the second terminal of the output current feedback loop compensation line 516 is connected to ground; a second terminal of the output current feedback loop optocoupler drive line 518 is grounded, and a third terminal is connected to a first terminal of the output current feedback loop optocoupler drive isolation diode 520; the second terminal of the output current feedback loop OPTO-coupler driven isolation diode 520 is connected to the OPTO-coupler drive pin OPTO.
As shown in fig. 5A, in some embodiments, the feedback loop control module 2032-1 further comprises an output voltage discharging unit 522, wherein a first terminal of the output voltage discharging unit 522 is connected to the output voltage detection pin Vo, and a second terminal thereof is connected to ground.
As shown in fig. 5A, in some embodiments, the feedback loop control module 2032-1 further comprises an output wire voltage drop compensation unit 524, wherein a first terminal of the output wire voltage drop compensation unit 524 is connected to a second terminal of the output voltage detection unit 502 and a second terminal is connected to a third terminal of the output voltage detection unit 502.
Fig. 5B illustrates an exemplary structural diagram of the output voltage feedback loop control module 2032-2 according to an embodiment of the utility model. As shown in fig. 5B, the output voltage feedback loop control module 2032-2 comprises an output voltage detection unit 502, an output voltage feedback loop transconductance error amplifier 504, an output voltage feedback loop compensation line 506, and an output voltage feedback loop opto-coupler drive line 508, and may further comprise an output voltage discharge unit 522 and an output wire voltage drop compensation unit 524 in some embodiments. In the output voltage feedback loop control module 2032-2, the third terminal of the output voltage feedback loop OPTO-coupler driving circuit 508 is not required to be connected to the OPTO-coupler driving pin OPTO via the output voltage feedback loop OPTO-coupler driving isolation diode 510, and other connection relationships are the same as the corresponding connection relationships in the output voltage and output current feedback loop control module 2032-1, and are not described herein again.
Fig. 5C illustrates an exemplary structural diagram of the output current feedback loop control module 2032-3 according to an embodiment of the utility model. As shown in fig. 5C, the output current feedback loop control module 2032-3 comprises an output current sampling and amplifying unit 512, an output current feedback loop transconductance error amplifier 514, an output current feedback loop compensation line 516, and an output current feedback loop optical coupling driving line 518. In the output current feedback loop control module 2032-3, the third terminal of the output current feedback loop OPTO-coupler driving circuit 518 is not required to be connected to the OPTO-coupler driving pin OPTO via the output current feedback loop OPTO-coupler driving isolation diode 520, and other connection relationships are the same as the corresponding connection relationships in the output voltage and output current feedback loop control module 2032-1, which is not described herein again.
Next, specific functions of the respective functional units shown in fig. 5A to 5C are described:
the output voltage detection unit 502 is used for sampling the output voltage of the system by dividing the voltage, and reducing the output voltage to a reasonable voltage range for the use of the subsequent functional unit. For example, in the output voltage detection unit 502, the resistors R1 and Rd are used to divide the output voltage, so as to reduce the output voltage to a reasonable voltage range for the subsequent functional units; the capacitor C1 is a loop compensation capacitor; in practice, the capacitor C1 may be connected in parallel with the resistor R1 or in parallel with the resistor Rd; meanwhile, the capacitor C1 may be replaced by a resistor-capacitor combination. Here, the dynamic boost compensation function is to activate the dynamic boost circuit when it is detected that the output voltage exceeds the set output range, so that the dynamic boost circuit sinks/sources the current to the output of the output voltage feedback loop compensation circuit 508, and pulls the output voltage back to the set voltage range. The output voltage detection unit 502 is mainly related to the output voltage feedback loop function, the dynamic enhanced compensation function, and the OVP/UVP protection function.
The output voltage feedback loop transconductance error amplifier 504 is configured to compare the output voltage sampled by the output voltage detection module 502 with the internal voltage reference Vref _ cv to generate an error current output. Here, the internal voltage reference Vref _ cv may be a fixed value or a variable value configured by the MCU. When the system is started or the output voltage is switched, soft switching of startup soft start and output voltage step-up and step-down can be realized in a Vref _ cv soft-up and soft-down mode. To improve system dynamic performance, the output voltage of the output voltage feedback loop transconductance error amplifier 504 needs to be within a certain range, e.g., [ Vgm _ min, Vgm _ max ]. When the output voltage detection unit 502 detects that the output voltage exceeds the set threshold range, the dynamic boost circuit is activated to sink/source current to the output of the output voltage feedback loop transconductance error amplifier 504, and the output voltage is pulled back to the set voltage range.
The output voltage feedback loop compensation circuit 506 is used for enabling the system to have reasonable time domain performance and frequency domain performance by selecting reasonable resistance and capacitance. For example, the output voltage feedback loop compensation circuit 506 may include a resistor R2 and a capacitor C2 connected between the output terminal of the output voltage feedback loop transconductance error amplifier 504 and the reference ground, and a capacitor C3 connected between the output terminal of the output voltage feedback loop transconductance error amplifier 504 and the reference ground, wherein the resistor R2 and the capacitor C2 are connected in series, and reasonable time domain performance and frequency domain performance may be obtained by setting reasonable resistance and capacitance values. It should be noted that the present invention is not limited to the output voltage feedback loop compensation circuit, and any other suitable circuit capable of implementing the compensation function is within the scope of the present invention. Typically, the open loop phase margin for a stable system may need to be above, for example, 45 degrees, while the gain margin may need to be above, for example, 10-12 dB.
The output voltage feedback loop optocoupler driving circuit 508 is configured to drive the optocoupler in a pull-down manner, so as to transmit control of the secondary side to the primary side control chip through the optocoupler. The connections shown in fig. 5A and 5B are only schematic and include those shown, as well as those that directly connect the output voltage of the output voltage feedback loop compensation line 506 to the MOS, or other connections.
The output voltage feedback loop optocoupler-driven isolation diode 510 is used for isolating the output voltage feedback loop from the output current feedback loop to prevent the two loop systems from interfering with each other in different modes.
The output current sampling and amplifying unit 512 is configured to sample a voltage across a sampling resistor of the output current, and amplify the sampled voltage to obtain a voltage range with an optimized conductance for use by a subsequent functional unit. The output current sampling and amplifying unit 512 is mainly related to the feedback function of the output current feedback loop and the OCP protection function.
The output current feedback loop transconductance error amplifier 514 is used for comparing the output voltage of the output current sampling and amplifying unit 512 with the internal current reference Vref _ cc to generate an error current output. The internal current reference Vref _ cc may be a fixed value or a variable value configured by the MCU. When the output current is switched, the soft switching of the output current can be realized by means of Vref _ cc soft rising and soft falling.
The output current feedback loop compensation circuit 516 is used to make the system have reasonable time domain performance and frequency domain performance by selecting reasonable resistance and capacitance. For example, the output current feedback loop compensation circuit 516 may include a resistor R20 and a capacitor C20 connected between the output terminal of the output current feedback loop transconductance error amplifier 514 and the reference ground, and a capacitor C30 connected between the output terminal of the output current feedback loop transconductance error amplifier 514 and the reference ground, wherein the resistor R20 and the capacitor C20 are connected in series, and reasonable time domain performance and frequency domain performance may be obtained by setting reasonable resistance and capacitance values. It should be noted that the present invention is not limited to the output current feedback loop compensation circuit, and any other suitable circuit capable of implementing the compensation function is within the scope of the present invention. In a stable system, the open loop phase margin needs to be above 45 degrees, for example, and the gain margin needs to be above 10-12 dB, for example.
The output current feedback loop optocoupler driving circuit 518 is configured to drive the optocoupler in a pull-down manner, and control of the secondary side is transmitted to the primary side control chip through the optocoupler. The connections shown in fig. 5A and 5C are only examples, and include the connections shown, and also include the connection of the output voltage of the output current feedback loop compensation line 516 directly to the MOS, or other connections.
The output current feedback loop optical coupling driving isolation diode 520 is used for isolating the output voltage feedback loop and the output current feedback loop, and mutual interference of two loop systems in different modes is prevented.
The output voltage discharging unit 522 is mainly used for turning on when the output voltage is switched by the internal voltage reference Vref _ cv under the condition of light and empty load. The output voltage discharging unit 522 is used as a dummy load of the system, and can rapidly discharge the output voltage to a set voltage when the output voltage is reduced so as to meet the system reduction time and performance specification, and can suppress overshoot of the output voltage when the output voltage is increased so as to rapidly return the output voltage to the set voltage. In fig. 5A and 5B, the output voltage discharging unit 522 is implemented by means of a constant current source (e.g., current source Io _ discharge), but the above-described function may be implemented by replacing the constant current source with a resistor (e.g., Rdis) as well. FIG. 6 shows an example circuit implementation of an output voltage discharge unit according to an embodiment of the present invention.
The output wire voltage drop compensation unit 524 is configured to provide a compensation current for the output wire by multiplying the output voltage (including information related to the output current) of the output current sampling and amplifying unit 512 by an appropriate scaling parameter K (e.g., K × (V _ sip-Visn)), using a Voltage Controlled Current Source (VCCS) or the like, and flowing the compensation current into a sampling point of the output voltage detection unit 502, i.e., a common terminal of the resistor R1 and the resistor Rd. By selecting a proper proportion reference K, the voltage drop compensation of the line end caused by the output wire rod can be realized, so that the line end voltage is always maintained at a set value in a full load range. Fig. 7 shows an example circuit implementation of the output wire voltage drop compensation unit 524 according to an embodiment of the present invention. As shown in fig. 7, a voltage source (e.g., kk (V _ isp-V _ isn) × Gain) proportional to the output current is superimposed on the internal voltage reference Vref _ cv to compensate the voltage drop at the line end caused by the output wire, and the voltage at the line end can be always maintained at the set value in the full load range by properly selecting the proportional parameter K.
In summary, the present invention provides a feedback control chip for an offline switching power supply circuit, where the feedback control chip may amplify an error between an output voltage or current and a set reference value through a transconductance error amplifier (OTA), and then transmit a feedback signal to a primary control chip through an optocoupler driving line. In addition, the feedback control chip can integrate one or more of the following functions at the same time: the device comprises an output voltage feedback control function, an output current feedback control function, an output wire voltage drop compensation function, an output voltage dynamic enhancement function, an output voltage/current soft switching function, a function of discharging an output capacitor during voltage boosting and reducing and the like. The highly integrated characteristic of the feedback control chip can meet the application of multiple output voltages such as PD/QC.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (13)
1. The utility model provides a feedback control chip for off-line switching power supply circuit which characterized in that, includes output voltage detection pin, opto-coupler drive pin and feedback loop control module, wherein:
the feedback loop control module comprises an output voltage detection unit, an output voltage feedback loop transconductance error amplifier, an output voltage feedback loop compensation circuit and an output voltage feedback loop optical coupling driving circuit,
a first terminal of the output voltage detection unit is connected to the output voltage detection pin, a second terminal is connected to a first terminal of the output voltage feedback loop transconductance error amplifier, a third terminal is connected to a second terminal of the output voltage feedback loop transconductance error amplifier and grounded,
a third terminal of the output voltage feedback loop transconductance error amplifier is connected to a first terminal of the output voltage feedback loop compensation line and a first terminal of the output voltage feedback loop optocoupler drive line,
the second terminal of the output voltage feedback loop compensation line is connected to ground,
and a second terminal of the output voltage feedback loop optical coupler driving circuit is grounded, and a third terminal is connected to the optical coupler driving pin.
2. The feedback control chip of claim 1, wherein the feedback loop control module further comprises an output voltage discharging unit, wherein a first terminal of the output voltage discharging unit is connected to the output voltage detection pin, and a second terminal of the output voltage discharging unit is connected to ground.
3. The feedback control chip according to claim 1, wherein the feedback loop control module further comprises an output wire voltage drop compensation unit, wherein a first terminal of the output wire voltage drop compensation unit is connected to a second terminal of the output voltage detection unit, and a second terminal is connected to a third terminal of the output voltage detection unit.
4. The feedback control chip of claim 1, wherein the feedback loop control module further comprises an output voltage feedback loop optocoupler drive isolation diode, wherein the output voltage feedback loop optocoupler drive isolation diode is connected between the optocoupler drive pin and a third terminal of the output voltage feedback loop optocoupler drive line.
5. The feedback control chip of claim 1, further comprising an output current detection positive pin and an output current detection negative pin, wherein:
the feedback loop control module also comprises an output current sampling and amplifying unit, an output current feedback loop transconductance error amplifier, an output current feedback loop compensation circuit and an output current feedback loop optical coupling driving circuit,
a first terminal of the output current sampling and amplifying unit is connected to the output current detection positive pin, a second terminal is connected to the output current detection negative pin, a third terminal is connected to a first terminal of the output current feedback loop transconductance error amplifier,
a second terminal of the output current feedback loop transconductance error amplifier is grounded, a third terminal is connected to a first terminal of the output current feedback loop compensation circuit and a first terminal of the output current feedback loop optical coupling driving circuit,
the second terminal of the output current feedback loop compensation line is connected to ground,
and a second terminal of the output current feedback loop optical coupler driving circuit is grounded, and a third terminal is connected to the optical coupler driving pin.
6. The feedback control chip of claim 5, wherein the feedback loop control module further comprises an output current feedback loop optocoupler drive isolation diode, wherein the output current feedback loop optocoupler drive isolation diode is connected between the optocoupler drive pin and a third terminal of the output current feedback loop optocoupler drive line.
7. The feedback control chip of claim 1, further comprising a digital control module, wherein the digital control module is coupled to the feedback loop control module.
8. The feedback control chip of claim 7, further comprising an under-voltage-lockout and low-dropout discharge module, wherein one end of the under-voltage-lockout and low-dropout discharge module is connected to the output voltage detection pin, and the other end of the under-voltage-lockout and low-dropout discharge module is connected to the digital control module.
9. The feedback control chip according to claim 7, further comprising a load switch driving pin and a load switch driving module, wherein one end of the load switch driving module is connected to the load switch driving pin, and the other end of the load switch driving module is connected to the digital control module.
10. The feedback control chip according to claim 7, further comprising a protocol communication port pin and a protocol communication module, wherein one end of the protocol communication module is connected to the protocol communication port pin, and the other end of the protocol communication module is connected to the digital control module.
11. The feedback control chip of claim 7, further comprising an output voltage discharge control module connected to the digital control module.
12. The feedback control chip of claim 7, further comprising an output voltage current protection control module connected to the digital control module.
13. An off-line switching power supply circuit comprising the feedback control chip of any one of claims 1 to 12.
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| CN202122267755.6U CN216356513U (en) | 2021-09-17 | 2021-09-17 | Off-line switching power supply circuit and feedback control chip thereof |
| TW110213549U TWM626774U (en) | 2021-09-17 | 2021-11-16 | Off-line switch power circuit and feedback control chip thereof |
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| CN202122267755.6U CN216356513U (en) | 2021-09-17 | 2021-09-17 | Off-line switching power supply circuit and feedback control chip thereof |
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| TW (1) | TWM626774U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114938136A (en) * | 2022-07-19 | 2022-08-23 | 伏达半导体(合肥)有限公司 | Power adjusting device, double-battery charging device and charging current adjusting method |
| CN114994393A (en) * | 2022-08-03 | 2022-09-02 | 钰泰半导体股份有限公司 | Voltage detection circuit, detection chip and electronic equipment |
-
2021
- 2021-09-17 CN CN202122267755.6U patent/CN216356513U/en active Active
- 2021-11-16 TW TW110213549U patent/TWM626774U/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114938136A (en) * | 2022-07-19 | 2022-08-23 | 伏达半导体(合肥)有限公司 | Power adjusting device, double-battery charging device and charging current adjusting method |
| CN114938136B (en) * | 2022-07-19 | 2022-11-01 | 伏达半导体(合肥)有限公司 | Power regulating device, double-battery charging device and charging current regulating method |
| CN114994393A (en) * | 2022-08-03 | 2022-09-02 | 钰泰半导体股份有限公司 | Voltage detection circuit, detection chip and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM626774U (en) | 2022-05-11 |
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