CN110347064B - Power supply control circuit - Google Patents

Power supply control circuit Download PDF

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CN110347064B
CN110347064B CN201810288605.3A CN201810288605A CN110347064B CN 110347064 B CN110347064 B CN 110347064B CN 201810288605 A CN201810288605 A CN 201810288605A CN 110347064 B CN110347064 B CN 110347064B
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resistor
capacitor
circuit
port
diode
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CN110347064A (en
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张亚春
公平
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Vertiv Tech Co Ltd
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Vertiv Tech Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/21—Pc I-O input output
    • G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
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Abstract

The invention discloses a power supply control circuit, which comprises a control chip, a power supply circuit connected with the chip, a switching device, a first resistor, a second resistor, a capacitor and an upper computer control circuit, wherein the switching device is connected with the first resistor and the second resistor; the first end of the switching device is connected with the upper computer control circuit; the first end of the switch device and the connection point of the upper computer control circuit are connected with the first end of the first resistor, and the second end of the first resistor is connected with VREF; the second end of the switch device is connected with the first end of the second resistor, and the second end of the first resistor and the VREF connecting point are connected with the second end of the second resistor; the third end of the switching device is connected with the first end of the capacitor, the second end of the capacitor is connected with the RT/CT, and the connection point of the second end of the switching device and the first end of the second resistor is connected with the connection point of the capacitor and the RT/CT; the connection point of the third end of the switching device and the first end of the capacitor is grounded, and the current compensation control function and the on-off control of the power circuit can be realized.

Description

Power supply control circuit
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply control circuit.
Background
A control chip of a commonly used PWM (Pulse Width Modulation) circuit includes a UC284X series chip, and the control circuit is simple, reliable, and low in cost, and is widely applied to a switching power supply control circuit. Taking the control chip as UC284X series chip as an example, voltage feedback control and current compensation control are the most basic circuit functions of UC 284X. In some low-power supply circuits, UC284X control circuit is further needed to complete control functions of the entire power supply circuit, that is, UC284X chip is used to implement on and off control of the power supply circuit, and UC284X chip at least includes the following ports: ISNS port, VREF port, RT/CT port, COMP port, VCC port, GND port and OUT port.
In the prior art, when the UC284X chip is applied to a switching power supply control circuit, the DRV _ G port and the AGND port are respectively connected to the OUT port and the GND port, and the ISNS port may be used to control the on/off of the power supply circuit, or the COMP port may be used to control the on/off of the power supply circuit. A circuit schematic diagram for controlling on-off of a power supply circuit by adopting an ISNS port is shown in fig. 1, a model of a UC284X chip in fig. 1 is a UC2844BN chip, a Vref port is connected with a Vref port of a UC284X chip, a Vcc port is connected with a Vcc port of a UC284X chip, on-off of the Vref port and the Vcc port is controlled by an input upper computer control signal, on-off of the power supply circuit is controlled by a working state of the UC284X chip, specifically, the Vref port is disconnected and a low level is input to the Vref port, the Vcc port is disconnected and a low level is input to the Vcc port, the UC284X chip does not work, and a low level is output by an OUT port and a GND port, so that a low-level driving signal is input to the power supply circuit connected with the DRV _ G port and the AGND port, and the power supply circuit; the Vref port is connected to input high level to the VREF port, the Vcc port is connected to input high level to the VCC port, the UC284X chip works, and high level is output through the OUT port, so that the DRV _ G port and the AGND port input high level driving signals to a power circuit connected with the DRV _ G port and the AGND port, and the power circuit is controlled to be started.
A schematic circuit diagram of a circuit adopting a COMP port to control on/off of a power supply circuit is shown in fig. 2, a model of a UC284X chip in fig. 2 is a UC2844BN chip, a Vb port and an AGND port are connected with a COMP port of a UC284X chip, the connection and disconnection of the Vb port and the AGND port can be controlled by an input upper computer control signal, the on and off of the power supply circuit are controlled by a working state of the UC284X chip, specifically, the Vb port and the AGND port are disconnected and a low level is input to the COMP port, the UC284X chip does not work, a low level is output through an OUT port, so that a low level driving signal is input to the power supply circuit connected with the DRV _ G port and the AGND port, and the power supply circuit is controlled to be switched off; the Vb port and the AGND port are connected to the COMP port to input high level, the UC284X chip works, and the OUT port outputs high level, so that the DRV _ G port and the AGND port input high level driving signals to a power circuit connected with the DRV _ G port and the AGND port, and the power circuit is controlled to be started.
Although the scheme shown in fig. 1 can implement on-off control of the power supply circuit through the UC284X chip, the ISNS port of the UC284X chip is occupied, and therefore the UC284X chip cannot implement a control function of current compensation of the power supply circuit; in the scheme shown in fig. 2, since Q101 is powered by the level of the COMP port of the UC284X chip, and the level of the COMP port is not always stable, it may not be possible to effectively control the on/off of Q101, and therefore, it is not desirable to control the on/off of the power supply circuit by controlling the COMP port of the UC284X chip.
Disclosure of Invention
The invention provides a power supply control circuit, which is used for solving the problems that the current compensation cannot be realized when an ISNS port is occupied and the level of a COMP port is unstable and is not suitable for power supply control in the prior art.
The invention provides a power supply control circuit, which comprises a control chip, a power supply circuit connected with the control chip, a switching device, a first resistor, a second resistor, a first capacitor and an upper computer control circuit, wherein the switching device is connected with the first resistor and the second resistor; wherein,
the first end of the switching device is connected with the upper computer control circuit; the first end of the switch device is connected with the first connecting point of the upper computer control circuit and the first end of the first resistor, and the second end of the first resistor is connected with the VREF port of the control chip;
a second end of the switching device is connected with a first end of the second resistor, and a second connecting point of the second end of the first resistor and the VREF port is connected with a second end of the second resistor;
the third end of the switching device is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the RT/CT port of the control chip, and the second end of the switching device and the third connection point of the first end of the second resistor are connected with the fourth connection point of the first capacitor and the RT/CT port; a fifth connection point of a third end of the switching device and the first end of the first capacitor is grounded;
and the upper computer control circuit is used for outputting an upper computer control signal for controlling the on-off of the power supply circuit.
Further, the circuit further comprises: a first diode; wherein,
the first end of the switch device is connected with the cathode of the first diode, the anode of the first diode is connected with the upper computer control circuit, and a Vb port is connected between the anode of the first diode and the upper computer control circuit.
Further, the circuit further comprises: the circuit comprises a second diode, a third resistor, a second capacitor and a third capacitor; wherein,
the anode of the second diode is connected with a COMP port of the control chip, the cathode of the second diode is connected with the anode of the third diode, and the cathode of the third diode is connected with the second connection point;
the second connection point is connected with a first end of the third resistor, and a sixth connection point of a cathode of the second diode and an anode of the third diode is connected with a second end of the third resistor;
the second connecting point is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the first end of the third capacitor; a second end of the third capacitor is connected with a second end of the third resistor; and a seventh connection point of the second end of the second capacitor and the first end of the third capacitor is grounded.
Further, the circuit further comprises: a fourth resistor, a fourth capacitor and a fifth capacitor; wherein,
a first end of a fourth resistor Is connected with an ISNS port of the control chip, a second end of the fourth resistor Is connected with a first end of a fourth capacitor, a second end of the fourth capacitor Is grounded, and an eighth connection point of the second end of the fourth resistor and the first end of the fourth capacitor Is connected with the IS port;
and a first end of a fourth resistor and a ninth connection point of the ISNS port are connected with a first end of a fifth capacitor, and a second end of the fifth capacitor is connected with the fourth connection point.
Further, the circuit further comprises: a sixth capacitor, a seventh capacitor and a fifth resistor; wherein,
a first end of a sixth capacitor is connected with a VFB port of the control chip, and a second end of the sixth capacitor C106 is connected with the COMP port;
the first end of the seventh capacitor is connected with the second end of the sixth capacitor, the second end of the seventh capacitor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the first end of the sixth capacitor and the Vf port respectively.
Further, the circuit further comprises: the first capacitor with polarity, the eighth capacitor, the first voltage stabilizing diode, the sixth resistor, the second capacitor with polarity and the fourth diode; wherein,
the anode of the first polar capacitor is respectively connected with the VCC port of the control chip, the first end of the eighth capacitor, the cathode of the first voltage stabilizing diode and the first end of the sixth resistor, and the cathode of the first polar capacitor, the second end of the eighth capacitor, the anode of the first voltage stabilizing diode and the cathode of the second polar capacitor are grounded;
a second end of the sixth resistor is connected with an anode of the second polar capacitor and a cathode of the fourth diode respectively;
and the VCC port and the anode of the fourth diode are respectively connected with the power supply circuit.
Further, the circuit further comprises: a fifth diode, a third zener diode, a seventh resistor, and an eighth resistor; wherein,
a cathode of the fifth diode and a first end of the seventh resistor are respectively connected with an OUT port of the control chip, and a GND port of the control chip, an anode of the fifth diode, an anode of the third zener diode and a first end of the eighth resistor are respectively grounded;
and the second end of the seventh resistor, the cathode of the third voltage stabilizing diode and the second end of the eighth resistor are respectively connected with a DRV _ G port.
Further, the power circuit is connected with the DRV _ G port, and the power circuit is grounded.
Further, the upper computer control circuit includes: a ninth resistor, a sixth diode, a tenth resistor and a photoelectric coupler; wherein,
a first end of the ninth resistor is connected with the DRV port, and a second end of the ninth resistor, a cathode of the sixth diode, and a first end of the tenth resistor are respectively connected with an anode of the input end of the photoelectric coupler;
the anode of the sixth diode, the second end of the tenth resistor and the cathode of the input end of the photoelectric coupler are grounded; and the second end of the output end of the photoelectric coupler is connected with the Vb port, and the third end of the output end of the photoelectric coupler is grounded.
Further, the power supply circuit includes at least one of: the single-ended flyback power supply circuit, the Buck conversion Buck circuit, the forward power supply circuit, the low-power supply circuit, the power drive circuit and the pulse power supply circuit.
The invention provides a power supply control circuit, which comprises a control chip, a power supply circuit connected with the control chip, a switching device, a first resistor, a second resistor, a first capacitor and an upper computer control circuit, wherein the switching device is connected with the first resistor and the second resistor; the first end of the switching device is connected with the upper computer control circuit; the first end of the switch device is connected with the first connecting point of the upper computer control circuit and the first end of the first resistor, and the second end of the first resistor is connected with the VREF port of the control chip; a second end of the switching device is connected with a first end of the second resistor, and a second connecting point of the second end of the first resistor and the VREF port is connected with a second end of the second resistor; the third end of the switching device is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the RT/CT port of the control chip, and the second end of the switching device and the third connection point of the first end of the second resistor are connected with the fourth connection point of the first capacitor and the RT/CT port; a fifth connection point of a third end of the switching device and the first end of the first capacitor is grounded; the upper computer control circuit is used for outputting an upper computer control signal for controlling the on-off of the power circuit, and the on-off of the power circuit is not controlled by the ISNS port, so that the control chip can realize the control function of current compensation of the power circuit, and the power circuit is controlled by the VERF port and the RT/CT port, so that the control stability is higher compared with the control stability of the COMP port, and the on-off of the power circuit can be effectively controlled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a power control circuit provided in the prior art;
FIG. 2 is a schematic diagram of another prior art power control circuit;
fig. 3 is a schematic structural diagram of a power control circuit according to embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a power control circuit according to embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of a power control circuit according to embodiment 2 of the present invention;
fig. 6 is a schematic structural diagram of a power control circuit according to embodiment 3 of the present invention;
fig. 7 is a schematic structural diagram of a power control circuit according to embodiment 4 of the present invention;
fig. 8 is a schematic structural diagram of a power control circuit according to embodiment 5 of the present invention;
fig. 9 is a schematic structural diagram of a power control circuit according to embodiment 6 of the present invention;
fig. 10 is a schematic structural diagram of a power control circuit according to embodiment 7 of the present invention;
fig. 11 is a schematic structural diagram of a host computer control circuit according to embodiment 8 of the present invention;
fig. 12 is a schematic structural diagram of a single-ended flyback power supply circuit according to embodiment 9 of the present invention.
Detailed Description
In order to not influence the control function of the current compensation of the power supply circuit and effectively control the on-off of the power supply circuit, the embodiment of the invention provides a power supply control circuit.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
fig. 3 is a schematic structural diagram of a power supply control circuit according to an embodiment of the present invention, which includes a control chip and a power supply circuit connected to the control chip, and further includes a switching device, a first resistor R101, a second resistor R102, a first capacitor C101, and an upper computer control circuit; wherein,
the first end of the switching device is connected with the upper computer control circuit; a first end of the switching device and a first connecting point of the upper computer control circuit are connected with a first end of the first resistor R101, and a second end of the first resistor R101 is connected with a VREF port of the control chip;
a second end of the switching device is connected with a first end of the second resistor R102, and a second end of the first resistor R101 and a second connection point of the VREF port are connected with a second end of the second resistor R102;
a third end of the switching device is connected with a first end of the first capacitor C101, a second end of the first capacitor C101 is connected with an RT/CT port of the control chip, and a third connection point of the second end of the switching device and the first end of the second resistor R102 is connected with a fourth connection point of the first capacitor C101 and the RT/CT port; a fifth connection point of a third end of the switching device and the first end of the first capacitor C101 is grounded;
and the upper computer control circuit is used for outputting an upper computer control signal for controlling the on-off of the power supply circuit.
In order to not influence the control function of the current compensation of the power circuit and effectively control the on-off of the power circuit, the embodiment of the invention does not occupy an ISNS port of a control chip and does not use a COMP port, but adopts a VREF port and an RT/CT port to control the power circuit, and particularly realizes the control through the on-off of a switch device in the control process.
The model of the control chip may be a UC284X chip, a UC384X chip, and the like, and in the embodiment of the present invention, the control chip with the model of UC284X chip is mainly taken as an example for description, and it is believed that, for a person skilled in the art, after the model of the control chip is replaced by another model of chip, according to the connection structure and the control process in the embodiment of the present invention, the control of the power supply circuit can still be achieved, and details are not described herein.
The control chip at least comprises the following ports: ISNS port, VREF port, RT/CT port, COMP port, VCC port, GND port and OUT port. The switching device can be a switching tube such as a triode or an MOS tube.
When the on-off working state of the power circuit needs to be controlled, the upper computer control circuit can output an upper computer control signal for controlling the on-off of the power circuit.
The connection structure of the first resistor R101, the second resistor R102 and the first capacitor C101 may function as an RC (resistance capacitance) oscillation circuit, and as can be known from the above circuit connection structure, when the control chip is the UC284X chip, the specific control process is as follows: when the upper computer control circuit outputs an upper computer control signal for controlling the power circuit to be disconnected, the switch device is switched on, and at the moment, the first capacitor C101 in the RC oscillating circuit is short-circuited, the RC oscillating circuit cannot start oscillation, the control chip circuit cannot work, no drive output exists, and the power circuit cannot work, so that the power circuit is disconnected; when the upper computer control circuit outputs an upper computer control signal for controlling the conduction of the power circuit, the switch device is switched off, at the moment, the first resistor R101, the second resistor R102 and the first capacitor C101 of the RC oscillating circuit can work, the RC oscillating circuit can start oscillation normally, the control chip circuit works normally, the drive output is realized, and the power circuit can work normally, so that the conduction of the power circuit is realized.
Taking the switching device as an example of a triode, the above control process is further described in detail, as shown in fig. 4, a first terminal of the switching device is a base of the triode Q101, a second terminal of the switching device is a collector of the triode, and a third terminal of the switching device is an emitter of the triode. When the switching device is a triode, the specific control process is as follows: the upper computer control circuit outputs a high-level upper computer control signal, the base of the triode is high level, the triode is conducted, at the moment, the first capacitor C101 in the RC oscillating circuit is short-circuited, the RC oscillating circuit cannot start oscillation, the control chip circuit cannot work, no driving output exists, and the power supply circuit cannot work, so that the power supply circuit is disconnected; the upper computer control circuit outputs an upper computer control signal of low level, the base electrode of the triode is low level, the triode is cut off, at the moment, the first resistor R101, the second resistor R102 and the first capacitor C101 of the RC oscillating circuit can work, the RC oscillating circuit can start oscillation normally, the control chip circuit works normally, driving output is provided, and the power circuit can work normally, so that the power circuit is switched on.
In the embodiment of the present invention, the switching device is only taken as an example to be described in detail, and it is believed that a person skilled in the art can know the connection structure and the control process of the power control circuit when the switching device is an MOS transistor or other switching devices according to the power control circuit and the control process, and therefore details are not described in the embodiment of the present invention.
In order to further ensure the stability of the control of the power supply control circuit, a device for voltage stabilization, such as a diode, a voltage stabilizing diode and the like, can be connected between the switching device and the upper computer control circuit.
In addition, the ISNS port of the control chip needs to have an input signal Is, which may be directly input or input through a current compensation circuit. A VFB port of the control chip needs to have a feedback signal VFB, the feedback signal VFB may be directly input or input through a voltage compensation circuit, a feedback signal needs to be input between the VFB port and a COMP port of the control chip, a resistor (as shown in fig. 3) may be connected between the VFB port and the COMP port, or a capacitor and other devices may be connected between the VFB port and the COMP port, or other feedback circuits may be connected between the VFB port and the COMP port.
In the embodiment of the invention, the ISNS port is not occupied to control the on-off of the power circuit, so that the control chip can realize the control function of the current compensation of the power circuit, and the power circuit is controlled through the VERF port and the RT/CT port, compared with the COMP port, the control stability is higher, and the on-off of the power circuit can be effectively controlled.
Example 2:
in order to ensure the stability of the control of the power control circuit, on the basis of the above embodiment, as shown in fig. 5, in the embodiment of the present invention, the circuit further includes: a first diode D101; wherein,
the first end of the switching device is connected with the cathode of the first diode D101, the anode of the first diode D101 is connected with the upper computer control circuit, and a Vb port is connected between the anode of the first diode D101 and the upper computer control circuit.
When the upper computer control circuit outputs an upper computer control signal, a diode in the power supply control circuit can play a role in stabilizing voltage, so that the control stability of the power supply control circuit is further ensured.
The upper computer control circuit outputs an upper computer control signal through the Vb port, and the first diode outputs the upper computer control signal to the first end of the switching device after receiving the upper computer control signal through the Vb port so as to control the power circuit.
Example 3:
in order to ensure the stability of the control of the power control circuit, on the basis of the above embodiments, as shown in fig. 6, in the embodiment of the present invention, the circuit further includes: a second diode D102, a third diode D103, a third resistor R103, a second capacitor C102, and a third capacitor C103; wherein,
the anode of the second diode D102 is connected to the COMP port of the control chip, the cathode of the second diode D102 is connected to the anode of the third diode D103, and the cathode of the third diode D103 is connected to the second connection point;
the second connection point is connected to a first end of the third resistor R103, and a sixth connection point between a cathode of the second diode D102 and an anode of the third diode D103 is connected to a second end of the third resistor R103;
the second connection point is connected with a first end of the second capacitor C102, and a second end of the second capacitor C102 is connected with a first end of the third capacitor C103; a second end of the third capacitor C103 is connected to a second end of the third resistor R103; a seventh connection point between the second end of the second capacitor C102 and the first end of the third capacitor C103 is grounded.
It can be seen that in the embodiment of the present invention, the connection structure of the second diode D102, the third diode D103, the third resistor R103, the second capacitor C102, and the third capacitor C103 may function as a soft start circuit, and since the soft start circuit may prevent an impact current from affecting the power supply control circuit, the reliable operation of the power supply control circuit is ensured, thereby ensuring the stability of the control of the power supply control circuit.
Example 4:
in order to implement the current compensation function, on the basis of the above embodiments, in an embodiment of the present invention, as shown in fig. 7, the circuit further includes: a fourth resistor R104, a fourth capacitor C104 and a fifth capacitor C105; wherein,
a first end of a fourth resistor R104 Is connected to the ISNS port of the control chip, a second end of the fourth resistor R104 Is connected to a first end of a fourth capacitor C104, a second end of the fourth capacitor C104 Is grounded, and an eighth connection point between the second end of the fourth resistor R104 and the first end of the fourth capacitor C104 Is connected to the Is port;
a first end of the fourth resistor R104 and a ninth connection point of the ISNS port are connected to a first end of the fifth capacitor C105, and a second end of the fifth capacitor C105 is connected to the fourth connection point.
It can be seen that in the embodiment of the present invention, the connection structure of the fourth resistor R104, the fourth capacitor C104, and the fifth capacitor C105 can function as a current compensation circuit, so that a current compensation function can be realized.
Example 5:
in order to implement the voltage compensation function, on the basis of the above embodiments, as shown in fig. 8, in the embodiment of the present invention, the circuit further includes: a sixth capacitor C106, a seventh capacitor C107 and a fifth resistor R105; wherein,
a first end of a sixth capacitor C106 is connected with the VFB port of the control chip, and a second end of the sixth capacitor C106 is connected with the COMP port;
a first end of the seventh capacitor C107 is connected to a second end of the sixth capacitor C106, a second end of the seventh capacitor C107 is connected to a first end of the fifth resistor R105, and a second end of the fifth resistor R105 is connected to the first end of the sixth capacitor C106 and the Vf port, respectively.
In the embodiment of the present invention, the resistor connected between the VFB port and the COMP port in fig. 3 is replaced by a sixth capacitor C106.
It can be seen that in the embodiment of the present invention, the connection structure of the sixth capacitor C106, the seventh capacitor C107 and the fifth resistor R105 may function as a voltage compensation circuit, so that a voltage compensation function may be implemented.
Example 6:
in order to ensure the stability of the control of the power control circuit, on the basis of the above embodiments, as shown in fig. 9, in the embodiment of the present invention, the circuit further includes: a first polar capacitor C201, an eighth capacitor C108, a first zener diode D201, a sixth resistor R106, a second polar capacitor C202, and a fourth diode D104; wherein,
an anode of the first polar capacitor C201 is connected to the VCC port of the control chip, the first end of the eighth capacitor 108, the cathode of the first zener diode D201, and the first end of the sixth resistor R106, respectively, and a cathode of the first polar capacitor C201, a second end of the eighth capacitor C108, an anode of the first zener diode D201, and a cathode of the second polar capacitor C202 are grounded;
a second end of the sixth resistor R106 is connected to an anode of the second polar capacitor C202 and a cathode of the fourth diode D104, respectively;
the VCC port and the anode of the fourth diode D104 are connected to the power supply circuit, respectively.
In the embodiment of the present invention, the connection structure of the first polar capacitor C201, the eighth capacitor C108, the first voltage stabilizing diode D201, the sixth resistor R106, the second polar capacitor C202, and the fourth diode D104 can function as a VCC voltage stabilizing circuit, so that a voltage stabilizing effect can be achieved, and the stability of the control of the power control circuit can be further achieved.
Example 7:
in order to improve the effectiveness of the control of the power control circuit, on the basis of the above embodiments, as shown in fig. 10, in the embodiment of the present invention, the circuit further includes: a fifth diode D105, a third zener diode D203, a seventh resistor R107, and an eighth resistor R108; wherein,
a cathode of the fifth diode D105 and a first end of the seventh resistor R107 are respectively connected to an OUT port of the control chip, and a GND port of the control chip, an anode of the fifth diode D105, an anode of the third zener diode D203, and a first end of the eighth resistor R108 are respectively grounded;
a second end of the seventh resistor R107, a cathode of the third zener diode D203, and a second end of the eighth resistor R108 are connected to the DRV _ G port, respectively.
The power circuit is connected with the DRV _ G port, and the power circuit is grounded.
In the embodiment of the present invention, the connection structure of the fifth diode D105, the third zener diode D203, the seventh resistor R107 and the eighth resistor R108 may function as a driving circuit, and the control chip may be connected to the corresponding DRV _ G port and AGND port of the power circuit through the DRV _ G port and AGND port of the driving circuit, so as to implement the effectiveness of controlling the power control circuit.
Example 8:
on the basis of the above embodiments, as shown in fig. 11, in the embodiment of the present invention, the upper computer control circuit includes: a ninth resistor R109, a sixth diode D106, a tenth resistor R110 and a photocoupler U101; wherein,
a first end of the ninth resistor R109 is connected to the DRV port, and a second end of the ninth resistor R109, a cathode of the sixth diode D106, and a first end of the tenth resistor R110 are respectively connected to an anode of the input end of the photocoupler U101;
the anode of the sixth diode D106, the second end of the tenth resistor R110, and the cathode of the input end of the photocoupler U101 are grounded; the second end of the output end of the photoelectric coupler U101 is connected with the Vb port, and the third end of the output end of the photoelectric coupler U101 is grounded.
In the embodiment of the invention, an upper computer control circuit composed of a ninth resistor R109, a sixth diode D106, a tenth resistor R110 and a photocoupler U101 can realize control of on/off of a power supply circuit, and specifically the control includes that a DRV port and a GND1 port are used as input ports of upper computer control signals, the upper computer control signals input through the DRV port and the GND1 port are isolated by the photocoupler U101 to obtain output signals of a Vb port and an AGND port, the output signals are used as control signals for controlling the power supply circuit, the control signals generate driving signals for the power supply circuit through a control chip, and the driving signals are input into the power supply circuit through a DRV _ G port and the AGND port to realize control of the power supply circuit.
Example 9:
on the basis of the above embodiments, in an embodiment of the present invention, the power supply circuit includes at least one of: the power supply circuit comprises a single-ended flyback power supply circuit, a Buck (Buck conversion) circuit, a forward power supply circuit, a low-power supply circuit, a power driving circuit and a pulse power supply circuit.
The power control circuit provided in the embodiment of the invention can be applied to control of power circuits in various application occasions, and for power circuits in different application occasions, a person skilled in the art is believed to be capable of connecting the power circuit with the power control circuit so as to realize control of the power circuit.
If the single-ended flyback power supply circuit Is used, the circuit diagram Is as shown in fig. 12, the single-ended flyback power supply circuit Is connected with the DRV _ G port and the AGND port corresponding to the circuit functioning as the driving circuit in the above embodiment through the DRV _ G port and the AGND port, the first end of R111 may be connected with the VCC port, the fourth end of T101 may be connected with the anode of D104 in the circuit functioning as the VCC voltage stabilizing circuit, the Is port may be connected with the Is port corresponding to the circuit functioning as the current compensation circuit, and the Vf port may be connected with the Vf port corresponding to the circuit functioning as the voltage compensation circuit, where the OUT _ P port and the OUT _ N port are voltage output ports of the power supply circuit.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A power supply control circuit comprises a control chip and a power supply circuit connected with the control chip, and is characterized by further comprising a switching device, a first resistor, a second resistor, a first capacitor and an upper computer control circuit; wherein,
the first end of the switching device is connected with the upper computer control circuit; the first end of the switch device is connected with the first connecting point of the upper computer control circuit and the first end of the first resistor, and the second end of the first resistor is connected with the VREF port of the control chip;
a second end of the switching device is connected with a first end of the second resistor, and a second connecting point of the second end of the first resistor and the VREF port is connected with a second end of the second resistor;
the third end of the switching device is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the RT/CT port of the control chip, and the second end of the switching device and the third connection point of the first end of the second resistor are connected with the fourth connection point of the first capacitor and the RT/CT port; a fifth connection point of a third end of the switching device and the first end of the first capacitor is grounded;
and the upper computer control circuit is used for outputting an upper computer control signal for controlling the on-off of the power supply circuit.
2. The circuit of claim 1, wherein the circuit further comprises: a first diode; wherein,
the first end of the switch device is connected with the cathode of the first diode, the anode of the first diode is connected with the upper computer control circuit, and a Vb port is connected between the anode of the first diode and the upper computer control circuit.
3. The circuit of claim 1, wherein the circuit further comprises: the circuit comprises a second diode, a third resistor, a second capacitor and a third capacitor; wherein,
the anode of the second diode is connected with a COMP port of the control chip, the cathode of the second diode is connected with the anode of the third diode, and the cathode of the third diode is connected with the second connection point;
the second connection point is connected with a first end of the third resistor, and a sixth connection point of a cathode of the second diode and an anode of the third diode is connected with a second end of the third resistor;
the second connecting point is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the first end of the third capacitor; a second end of the third capacitor is connected with a second end of the third resistor; and a seventh connection point of the second end of the second capacitor and the first end of the third capacitor is grounded.
4. The circuit of claim 1, wherein the circuit further comprises: a fourth resistor, a fourth capacitor and a fifth capacitor; wherein,
a first end of a fourth resistor Is connected with an ISNS port of the control chip, a second end of the fourth resistor Is connected with a first end of a fourth capacitor, a second end of the fourth capacitor Is grounded, and an eighth connection point of the second end of the fourth resistor and the first end of the fourth capacitor Is connected with the IS port;
and a first end of a fourth resistor and a ninth connection point of the ISNS port are connected with a first end of a fifth capacitor, and a second end of the fifth capacitor is connected with the fourth connection point.
5. The circuit of claim 3, wherein the circuit further comprises: a sixth capacitor, a seventh capacitor and a fifth resistor; wherein,
a first end of a sixth capacitor is connected with a VFB port of the control chip, and a second end of the sixth capacitor is connected with the COMP port;
the first end of the seventh capacitor is connected with the second end of the sixth capacitor, the second end of the seventh capacitor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the first end of the sixth capacitor and the Vf port respectively.
6. The circuit of claim 1, wherein the circuit further comprises: the first capacitor with polarity, the eighth capacitor, the first voltage stabilizing diode, the sixth resistor, the second capacitor with polarity and the fourth diode; wherein,
the anode of the first polar capacitor is respectively connected with the VCC port of the control chip, the first end of the eighth capacitor, the cathode of the first voltage stabilizing diode and the first end of the sixth resistor, and the cathode of the first polar capacitor, the second end of the eighth capacitor, the anode of the first voltage stabilizing diode and the cathode of the second polar capacitor are grounded;
a second end of the sixth resistor is connected with an anode of the second polar capacitor and a cathode of the fourth diode respectively;
and the VCC port and the anode of the fourth diode are respectively connected with the power supply circuit.
7. The circuit of claim 1, wherein the circuit further comprises: a fifth diode, a third zener diode, a seventh resistor, and an eighth resistor; wherein,
a cathode of the fifth diode and a first end of the seventh resistor are respectively connected with an OUT port of the control chip, and a GND port of the control chip, an anode of the fifth diode, an anode of the third zener diode and a first end of the eighth resistor are respectively grounded;
and the second end of the seventh resistor, the cathode of the third voltage stabilizing diode and the second end of the eighth resistor are respectively connected with a DRV _ G port.
8. The circuit of claim 7, wherein the power circuit is connected to the DRV _ G port and the power circuit is grounded.
9. The circuit of claim 1, wherein the upper computer control circuit comprises: a ninth resistor, a sixth diode, a tenth resistor and a photoelectric coupler; wherein,
a first end of the ninth resistor is connected with the DRV port, and a second end of the ninth resistor, a cathode of the sixth diode, and a first end of the tenth resistor are respectively connected with an anode of the input end of the photoelectric coupler;
the anode of the sixth diode, the second end of the tenth resistor and the cathode of the input end of the photoelectric coupler are grounded; and the second end of the output end of the photoelectric coupler is connected with the Vb port, and the third end of the output end of the photoelectric coupler is grounded.
10. The circuit of any of claims 1-9, wherein the power circuit comprises at least one of: the single-ended flyback power supply circuit, the Buck conversion Buck circuit, the forward power supply circuit, the low-power supply circuit, the power drive circuit and the pulse power supply circuit.
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