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A power control circuit
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A technology of power supply circuit and control circuit, applied in the field of power supply, can solve the problems of inability to realize current compensation, unstable COMP port level, ISNS port occupation, etc.
Active Publication Date: 2020-11-20
EMERSON NETWORK POWER CO LTD
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Abstract
Description
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Problems solved by technology
[0006] The present invention provides a power supply control circuit, which is used to solve the problems in the prior art that the ISNS port is occupied and the current compensation cannot be realized, and the level of the COMP port is unstable and is not suitable for power supply control.
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Embodiment 1
[0053] image 3 A schematic structural diagram of a power supply control circuit provided by an embodiment of the present invention, including a control chip and a power supply circuit connected to the control chip, and also includes a switching device, a first resistor R101, a second resistor R102, a first capacitor C101 and PC control circuit; among them,
[0054] The first end of the switching device is connected to the upper computer control circuit; the first connection point between the first end of the switching device and the upper computer control circuit is connected to the first end of the first resistor R101, The second end of the first resistor R101 is connected to the VREF port of the control chip;
[0055] The second end of the switching device is connected to the first end of the second resistor R102, and the second connection point between the second end of the first resistor R101 and the VREF port is connected to the first end of the second resistor R102. T...
Embodiment 2
[0069] In order to ensure the stability of the control of the power supply control circuit, on the basis of the above-mentioned embodiments, as Figure 5 In the illustrated embodiment of the present invention, the circuit further includes: a first diode D101; wherein,
[0070] The first end of the switching device is connected to the cathode of the first diode D101, the anode of the first diode D101 is connected to the upper computer control circuit, and the first end of the first diode D101 A Vb port is connected between the anode and the host computer control circuit.
[0071]When the upper computer control circuit outputs the upper computer control signal, the diode in the power control circuit can stabilize the voltage, thereby further ensuring the stability of the power control circuit control.
[0072] The upper computer control circuit outputs the upper computer control signal through the Vb port, and after the first diode receives the upper computer control signal thr...
Embodiment 3
[0074] In order to ensure the stability of the control of the power supply control circuit, on the basis of the above-mentioned embodiments, as Figure 6 In the illustrated 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,
[0075] 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 third diode The cathode of D103 is connected to the second connection point;
[0076] The second connection point is connected to the first end of the third resistor R103, and the sixth connection point between the cathode of the second diode D102 and the anode of the third diode D103 is connected to the first end of the third resistor R103. The second end of the three resistors R103 is connected;
[0077] The second connection ...
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Abstract
The invention discloses a power supply control circuit comprising a control chip, a power supply circuit, a switching device, a first resistor, a second resistor, a capacitor and a host computer control circuit. The power supply circuit, the switching device, the first resistor, the second resistor, the capacitor and the host computer control circuit are connected with the chip. A first terminal of the switching device is connected to the host computer control circuit; the connecting point between the first terminal of the switching device and the host computer control circuit is connected with a first terminal of the first resistor; a second terminal of the first resistor is connected with VREF; a second terminal of the switching device is connected to a first terminal of the second resistor; the connecting point between the second terminal of the first resistor and the VREF is connected with a second terminal of the second resistor; a third terminal of the switching device is connected to a first terminal of the capacitor and a second terminal of the capacitor is connected with RT / CT; the connecting point between the second terminal of the switching device and the first terminalof the second resistor is connected with the connecting point between the capacitor and the RT / CT; and the connecting point between the third terminal of the switching device and the first terminal ofthe capacitor is grounded. Therefore, the current compensationcontrol function is realized and the on and off of the power supply circuit is controlled effectively.
Description
technical field [0001] The invention relates to the technical field of power supplies, in particular to a power supply control circuit. Background technique [0002] Commonly used PWM (Pulse Width Modulation, pulse width modulation) circuit control chips include UC284X series chips, whose control circuits are simple, reliable, and low in cost, and are widely used in switching power supply control circuits. Taking the control chip as UC284X series chips as an example, voltagefeedback control and current compensation control are the most basic circuit functions of UC284X. In some low-power power supply circuits, it is also necessary to use the UC284X control circuit to complete the control function of the entire power supply circuit, that is, to use the UC284X chip to realize the on and off control of the power supply circuit. The UC284X chip includes at least the following ports: ISNS port, VREF port, RT / CT port, COMP port, VCC port, GND port and OUT port. [0003] When th...
Claims
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Application Information
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