CN220935020U - Power output control circuit, switching power supply and electronic system - Google Patents
Power output control circuit, switching power supply and electronic system Download PDFInfo
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- CN220935020U CN220935020U CN202322353222.9U CN202322353222U CN220935020U CN 220935020 U CN220935020 U CN 220935020U CN 202322353222 U CN202322353222 U CN 202322353222U CN 220935020 U CN220935020 U CN 220935020U
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Abstract
The embodiment of the application discloses a power output control circuit and an electronic system, wherein the power output control circuit comprises a first diode, a second diode, a first resistor module, an operational amplifier and a power supply, wherein the anode of the first diode is connected with the first end of the first resistor module and the non-inverting input end of the operational amplifier; the second end of the first resistor module is connected with the inverting input end of the operational amplifier, the fourth end of the first resistor module is connected with the positive electrode of the transmitting end of the first optocoupler, and the fifth end of the first resistor module is used for being connected with a first voltage; the output end of the operational amplifier is connected with the negative electrode of the emitting end of the first optical coupler, the collector electrode of the receiving end of the first optical coupler is connected with the first end of the second resistor module and the base electrode of the first triode, and the emitter electrode is grounded with the second end of the second resistor module and the emitter electrode of the first triode; the third end of the second resistor module is used for accessing a second voltage, and the collector electrode of the first triode is used for connecting with a protection pin of the power management chip; the problem of low reliability can be solved, and the reliability of the power output control circuit is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of power supply, in particular to a power output control circuit, a switching power supply and an electronic system.
Background
Many electronic systems are not powered off, and the power supply provides energy for maintaining the normal operation of the system.
The conventional power output control circuit generally uses an MOS tube, and when a load at a later stage is short-circuited, the MOS tube can flow a great current to fail, so that the reliability of the power output control circuit is low.
Disclosure of utility model
The embodiment of the application provides a power output control circuit, a switching power supply and an electronic system, which can solve the problem of low reliability of the power output control circuit and improve the reliability of the power output control circuit.
The embodiment of the application provides a power supply output control circuit which comprises a first diode, an operational amplifier, a first resistor module, a first optocoupler, a second resistor module and a first triode, wherein the first resistor module is connected with the first diode;
The anode of the first diode is connected with the first end of the first resistor module and the non-inverting input end of the operational amplifier, and the cathode of the first diode is used for receiving the level control signal;
The second end of the first resistor module is connected with the inverting input end of the operational amplifier, the third end of the first resistor module is grounded, the fourth end of the first resistor module is connected with the positive electrode of the transmitting end of the first optocoupler, and the fifth end of the first resistor module is used for being connected with a first voltage;
The output end of the operational amplifier is connected with the negative electrode of the emitting end of the first optical coupler, the collector electrode of the receiving end of the first optical coupler is connected with the first end of the second resistor module and the base electrode of the first triode, and the emitter electrode of the receiving end of the first optical coupler is grounded with the second end of the second resistor module and the emitter electrode of the first triode; the third end of the second resistor module is used for accessing the second voltage, the collector electrode of the first triode is used for being connected with a protection pin of the power management chip, and the power management chip is used for controlling the main power supply circuit corresponding to the conduction to supply power for the corresponding load when the protection pin is in a high level.
The embodiment of the application also provides a switching power supply, a standby power supply circuit, a main board circuit, a main power supply circuit and the power output control circuit;
The first end of the standby power supply circuit is connected with the first end of the power supply output control circuit and the first end of the main board circuit and is used for providing a first voltage for the power supply output control circuit;
The second end of the standby power supply circuit is connected with the second end of the power supply output control circuit and is used for providing a second voltage for the power supply output control circuit, the third end of the standby power supply circuit is used for being connected with a power supply, and the fourth end of the standby power supply circuit is grounded;
The second end of the main board circuit is connected with the third end of the power output control circuit and is used for sending a level control signal to the power output control circuit, and the third end of the main board circuit is grounded;
the first end of the main power supply circuit is connected with the fourth end of the power supply output control circuit, the fifth end of the power supply output control circuit is grounded, and the fourth end of the power supply output control circuit is in a high level when the level control signal received by the third end of the power supply output control circuit is a low level control signal, so that the first end of the main power supply circuit is also in the high level;
The second end of the main power supply circuit is used for being connected with a power supply, the third end of the main power supply circuit is used for being connected with a load, the fourth end of the main power supply circuit is grounded, and the first end of the main power supply circuit is used for being conducted when the first end of the main power supply circuit is at a high level so as to transmit the voltage of the power supply to the load.
The embodiment of the application also provides an electronic system which comprises the power output control circuit or the switching power supply.
The embodiment of the application provides a power output control circuit and an electronic system, wherein when a cathode end of a first diode of the power output control circuit receives a low-level control signal, based on that a non-inverting input end of an operational amplifier is lower than a voltage of an inverting input end of the operational amplifier, an output end of the operational amplifier is in a low-level state, so that a first optocoupler is conducted, a base electrode of a first triode is pulled down by a receiving end of the first optocoupler, the first triode is cut off, a protection pin of a power management chip connected with a collector electrode of the first triode is in a high level, the power management chip controls and conducts a corresponding main power circuit to supply power to a corresponding load, and when the corresponding load of the power output control circuit is in short circuit, each device cannot be influenced by the short circuit to fail, so that the reliability of the power output control circuit is improved.
Drawings
FIG. 1 is a schematic circuit diagram of a prior art power output control circuit;
FIG. 2 is a schematic circuit diagram of a power output control circuit according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a switching power supply according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Fig. 1 is a schematic circuit diagram of a power output control circuit in the prior art, referring to fig. 1, in the prior art, a gate of a MOS transistor Q in the power output control circuit is connected to an output end of a main board circuit, when the main board circuit outputs a high level signal, the gate of the MOS transistor Q receives a high level, and when the MOS transistor Q is turned off, V 0 cannot output, that is, cannot supply power to a load. When the main board circuit outputs a low-level signal, the grid electrode of the MOS tube Q receives the low level, the MOS tube Q is conducted, and the output V 0 supplies power for a later-stage load. However, when the latter stage load is short-circuited, the MOS tube Q can flow a great current to fail, and the reliability of the power output control circuit is low. In addition, the MOS tube Q used in the prior art is a high-power P-channel MOS tube, and the price is high, so that the cost of the whole circuit is high.
Therefore, in order to improve the reliability of the power output control circuit, fig. 2 is a schematic circuit diagram of the power output control circuit according to an embodiment of the present application, and as shown in fig. 2, the power output control circuit 10 includes a first diode D1, an operational amplifier U1B, a first resistor R1 module R1, a first optocoupler PC1, a second resistor R2 module R2, and a first triode Q1. The anode of the first diode D1 is connected to the first end of the first resistor R1 module R1 and the non-inverting input terminal (pin 5) of the operational amplifier U1B, and the cathode of the first diode D1 is configured to receive the level control signal (ps_on). The second end of the first resistor R1 module R1 is connected with the inverting input end (pin 6) of the operational amplifier U1B, the third end of the first resistor R1 module R1 is grounded, the fourth end of the first resistor R1 module R1 is connected with the positive electrode of the transmitting end (PC 1A) of the first optocoupler PC1, and the fifth end of the first resistor R1 module R1 is used for being connected with the first voltage (VoSTB). The output end (pin 7) of the operational amplifier U1B is connected with the negative electrode of the emitting end (PC 1A) of the first optocoupler PC1, the collector electrode of the receiving end (PC 1B) of the first optocoupler PC1 is connected with the first end of the second resistor R2 module R2 and the base electrode of the first triode Q1, and the emitter electrode of the receiving end (PC 1B) of the first optocoupler PC1 is grounded with the second end of the second resistor R2 module R2 and the emitter electrode of the first triode Q1; the third end of the second resistor R2 module R2 is used for being connected with a second Voltage (VCC), the collector electrode of the first triode Q1 is used for being connected with a protection pin PRO of the power management chip U1, and the power management chip U1 is used for controlling the corresponding main power supply circuit 11 to supply power for a corresponding load when the protection pin PRO is in a high level, namely, the output voltage V01 supplies power for the load.
The first resistor R1 module R1 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The first end of the first resistor R1 is connected to the anode of the first diode D1, the first end of the second resistor R2, and the non-inverting input terminal (pin 5) of the operational amplifier U1B, the second end of the first resistor R1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4, and the second end of the first resistor R1 is used for being connected to the first voltage (VoSTB). The second end of the second resistor R2 is grounded to the first end of the fifth resistor R5. The second terminal of the third resistor R3 is connected to the second terminal of the fifth resistor R5 and to the inverting input terminal (pin 6) of the operational amplifier U1B. The second end of the fourth resistor R4 is connected to the positive pole of the transmitting end (PC 1A) of the first optocoupler PC 1.
The second resistor R2 module R2 includes a sixth resistor R6 and a seventh resistor R7. The first end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, the collector of the receiving end (PC 1B) of the first optocoupler PC1, and the base of the first triode Q1, and the second end of the sixth resistor R6 is used for accessing the second Voltage (VCC). The second terminal of the seventh resistor R7 is grounded.
When the level control signal (ps_on) received by the cathode of the first diode D1 is the high level control signal, the voltage at the non-inverting input terminal (pin 5) of the operational amplifier U1B is higher than the voltage at the inverting input terminal (pin 6) thereof, the output terminal (pin 7) of the operational amplifier U1B is at the high level, the first optocoupler PC1 is not turned ON, at this time, the base of the first transistor Q1 is powered by the second Voltage (VCC) through the sixth resistor R6, the collector and emitter of the first transistor Q1 are turned ON, i.e., the CE junction is turned ON, the protection pin PRO of the power management chip U1 connected to the collector of the first transistor Q1 is pulled low, the corresponding main power supply circuit 11 is not turned ON, and the (later) load is not powered, i.e., the output voltage V01 is 0V. When the level control signal (ps_on) received by the cathode of the first diode D1 is a low level control signal, the voltage of the non-inverting input terminal (pin 5) of the operational amplifier U1B is lower than the voltage of the inverting input terminal (pin 6) thereof, the output terminal (pin 7) of the operational amplifier U1B is at a low level, the first optocoupler PC1 is turned ON, the base of the first triode Q1 is pulled down by the receiving terminal (PC 1B) of the first optocoupler PC1 at this time, so that the first triode Q1 is turned off, the protection pin PRO of the power management chip U1 connected to the collector of the first triode Q1 is at a high level (i.e., the protection pin PRO is released), and the power management chip U1 controls the main power supply circuit 11 corresponding to be turned ON to supply power to the corresponding load, i.e., the output voltage V01 supplies power to the corresponding load. When the protection pin PRO of the power management chip U1 is pulled down, the corresponding main power supply circuit 11 is controlled to be not operated, so that the idle load loss of the main power supply circuit 11 is reduced and the standby power consumption is reduced by the whole system; and when the corresponding load is short-circuited, each device of the power output control circuit 10 is not influenced by the short circuit to fail, so that the reliability of the power output control circuit 10 is improved. In addition, the cost of the operational amplifier U1B, the first optocoupler PC1, the first triode Q1 and other devices based on the power output control circuit 10 is far less than that of a high-power P-channel MOS tube used in the prior art, so that the cost input of the power output control circuit 10 is reduced.
On the basis of the implementation of the above embodiment, fig. 3 is a schematic circuit diagram of a switching power supply according to an embodiment of the present application, and referring to fig. 3, the switching power supply includes a standby power supply circuit 12, a main board circuit 13, a main power supply circuit 11, and the power output control circuit 10. The first terminal of the standby power supply circuit 12 is connected to the first terminal of the power output control circuit 10 and the first terminal of the main board circuit 13, and is configured to provide a first voltage (VoSTB) to the power output control circuit 10. A second terminal of the standby power supply circuit 12 is connected to a second terminal of the power output control circuit 10, for providing a second Voltage (VCC) to the power output control circuit 10, and a third terminal of the standby power supply circuit 12 is connected to a power supply, which may be an ac power such as a mains supply, and a fourth terminal of the standby power supply circuit 12 is grounded. A second terminal of the main board circuit 13 is connected to a third terminal of the power output control circuit 10, and is configured to send a level control signal (ps_on) to the power output control circuit 10, where the third terminal of the main board circuit 13 is grounded. The first terminal of the main power supply circuit 11 is connected to the fourth terminal of the power supply output control circuit 10, the fifth terminal of the power supply output control circuit 10 is grounded, and the power supply output control circuit 10 is configured to have the fourth terminal at a high level when the level control signal (ps_on) received by the third terminal thereof is a low level control signal, so that the first terminal of the main power supply circuit 11 is also at a high level. The second end of the main power supply circuit 11 is used for being connected to a power supply, the third end of the main power supply circuit 11 is used for being connected to a load, the fourth end of the main power supply circuit 11 is grounded, and the first end of the main power supply circuit 11 is used for being conducted when the first end of the main power supply circuit is at a high level so as to transmit the voltage of the power supply to the load. When the third terminal of the power output control circuit 10 receives the low-level control signal sent from the second terminal of the main board circuit 13, the fourth terminal of the power output control circuit 10 is at a high level, so that the first terminal of the main power supply circuit 11 connected to the fourth terminal of the power output control circuit 10 is also at a high level, and the main power supply circuit 11 supplies power to the corresponding load based on the fact that the first terminal of the main power supply circuit 11 is at a high level. The switching power supply can not negatively affect all devices under the condition of load short circuit, and the overall reliability is improved.
The main power supply circuit 11 includes a power management chip U1, an input sub-circuit 111, a first power sub-circuit 112, and a first feedback sub-circuit 113. The first end of the input sub-circuit 111 is connected to the high voltage start pin HV of the power management chip U1 and the first end of the first power sub-circuit 112, the second end of the input sub-circuit 111 is grounded, and the third end of the input sub-circuit 111 is used for accessing the power supply. The high-end pin Ho of the power management chip U1 is connected to the second end of the first power sub-circuit 112, the first power pin VCCVS of the power management chip U1 is connected to the third end of the first power sub-circuit 112, the low-end pin Lo of the power management chip U1 is connected to the fourth end of the first power sub-circuit 112, the current detection pin CS of the power management chip U1 is connected to the fifth end of the first power sub-circuit 112, the protection pin PRO of the power management chip U1 is connected to the fourth end of the power output control circuit 10, and the feedback pin FB of the power management chip U1 is connected to the first end of the first feedback sub-circuit 113; the power management chip U1 is configured to control the first power sub-circuit 112 to be turned on when the protection pin PRO detects a high level signal. The sixth terminal of the first power sub-circuit 112 is grounded, the seventh terminal of the first power sub-circuit 112 is connected to the second terminal of the first feedback sub-circuit 113, and the seventh terminal of the first power sub-circuit 112 is used for outputting a voltage to a load.
The input sub-circuit 111 includes a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a first electrolytic capacitor E1, and an eighth resistor R8. The anode of the second diode D2 is connected to the cathode of the third diode D3, and the anode of the second diode D2 is connected to the live wire terminal (L). The cathode of the second diode D2 is connected to the cathode of the fourth diode D4, the anode of the first electrolytic capacitor E1, and the first end of the eighth resistor R8. The anode of the third diode D3, the anode of the fifth diode D5, and the cathode of the first electrolytic capacitor E1 are grounded. The anode of the third diode D3 is connected to the cathode of the fifth diode D5, and the anode of the third diode D3 is connected to the neutral terminal (N). The second end of the eighth resistor R8 is connected with a high-voltage starting pin HV of the power management chip U1, and the power management chip U1 is used for starting work when the voltage value received by the high-voltage starting pin HV reaches a preset threshold value. After the power management chip U1 starts to work, the protection pin PRO monitors a level signal, and when the protection pin PRO detects a high level signal, the first power sub-circuit 112 is controlled to be conducted, and the first power sub-circuit 112 supplies power to a load through a seventh end of the first power sub-circuit.
In an alternative embodiment, the live (L) and neutral (N) terminals are used to access mains.
The first power sub-circuit 112 includes a high-side unit 1121, a low-side unit 1122, a current detection unit 1123, and a first transformation unit 1124. The first end of the high-side unit 1121 is connected to the high-side pin Ho of the power management chip U1, the second end of the high-side unit 1121 is connected to the first end of the eighth resistor R8, and the third end of the high-side unit 1121 is connected to the first power pin VCCVS of the power management chip U1, the first end of the low-side unit 1122, and the first end of the first transforming unit 1124. The second end of the low-end unit 1122 is connected to the low-end pin Lo of the power management chip U1, the third end of the low-end unit 1122 is connected to the second end of the first voltage transformation unit 1124 and the first end of the current detection unit 1123, and the fourth end of the low-end unit 1122 is grounded. A second end of the current detection unit 1123 is connected to the current detection pin CS of the power management chip U1, and a third end of the current detection unit 1123 is grounded. The third terminal of the first transforming unit 1124 is grounded, the fourth terminal of the first transforming unit 1124 is connected to the second terminal of the first feedback sub-circuit 113, and the first transforming unit 1124 is configured to transform the voltages received at the first terminal and the second terminal, and output a voltage to the load through the fourth terminal thereof.
The high-side unit 1121 includes a sixth diode D6, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first MOS transistor Q1, and a first capacitor C1. The first end of the ninth resistor R9 is connected to the high-side pin Ho of the power management chip U1 and the cathode of the sixth diode D6. The anode of the sixth diode D6 is connected to the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is connected to the second end of the ninth resistor R9, the first end of the eleventh resistor R11, and the gate of the first MOS transistor Q1. The drain electrode of the first MOS transistor Q1 is connected with the first end of the eighth resistor R8 and the first end of the first capacitor C1. The source of the first MOS transistor Q1 is connected to the second end of the eleventh resistor R11, the second end of the first capacitor C1, the first power pin VCCVS of the power management chip U1, the first end of the low-end unit 1122, and the first end of the first voltage transformation unit 1124. After the power management chip U1 starts working, the level signal is monitored through the protection pin PRO, and when the protection pin PRO detects the high level signal, a corresponding control signal is sent to the grid electrode of the first MOS tube Q1 through the high-end pin Ho of the power management chip U1 so as to control the first MOS tube Q1 to be conducted.
The low-side unit 1122 includes a seventh diode D7, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a second MOS transistor Q2, a second capacitor C2, and a third capacitor C3. The first end of the twelfth resistor R12 is connected to the low-end pin Lo of the power management chip U1 and the cathode of the seventh diode D7. An anode of the seventh diode D7 is connected to the first end of the thirteenth resistor R13. The second end of the thirteenth resistor R13 is connected to the second end of the twelfth resistor R12, the first end of the fourteenth resistor R14, and the gate of the second MOS transistor Q2. The drain of the second MOS transistor Q2 is connected to the third end of the high-side unit 1121 (i.e., the source of the first MOS transistor Q1), the first power pin VCCVS of the power management chip U1, the first end of the first transforming unit 1124, and the first end of the second capacitor C2. The source of the second MOS transistor Q2 is grounded to the second end of the fourteenth resistor R14, the second end of the second capacitor C2, and the first end of the third capacitor C3. The second terminal of the third capacitor C3 is connected to the second terminal of the first transforming unit 1124 and the first terminal of the current detecting unit 1123. After the power management chip U1 starts working, the level signal is monitored through the protection pin PRO, and when the protection pin PRO detects the high level signal, a corresponding control signal is sent to the grid electrode of the second MOS tube Q2 through the low-end pin Lo of the power management chip U1 so as to control the conduction of the second MOS tube Q2.
The current detection unit 1123 includes a fourth capacitor C4, a fifth capacitor C5, a fifteenth resistor R15, and a sixteenth resistor R16. The first end of the fourth capacitor C4 is connected to the current detection pin CS of the power management chip U1, the first end of the fifteenth resistor R15, and the first end of the sixteenth resistor R16. The second end of the fourth capacitor C4 is grounded to the second end of the fifteenth resistor R15. The second terminal of the sixteenth resistor R16 is connected to the first terminal of the fifth capacitor C5, and the second terminal of the fifth capacitor C5 is connected to the third terminal of the low-side unit 1122 (i.e., the second terminal of the third capacitor C3) and the second terminal of the first transforming unit 1124.
The first transforming unit 1124 includes a first transformer T1, an eighth diode D8, a ninth diode D9, and a second electrolytic capacitor E2. The first end of the primary side of the first transformer T1 is connected to the third end of the high-side unit 1121 (i.e., the source of the first MOS transistor Q1), the first power pin VCCVS of the power management chip U1, and the first end of the low-side unit 1122. The second terminal of the primary side of the first transformer T1 is connected to the third terminal of the low-side unit 1122 (i.e., the second terminal of the third capacitor C3) and the first terminal of the current detection unit 1123. The first end of the secondary side of the first transformer T1 is connected to the anode of the eighth diode D8. The cathode of the eighth diode D8 is connected to the cathode of the ninth diode D9, the anode of the second electrolytic capacitor E2, and the second terminal of the first feedback sub-circuit 113, and the cathode of the eighth diode D8 is configured to output a voltage to a load. The second end of the secondary side of the first transformer T1 is grounded to the negative electrode of the second electrolytic capacitor E2. An anode of the ninth diode D9 is connected to a third terminal of the secondary side of the first transformer T1. After the power management chip U1 starts to work, the level signal is monitored through the protection pin PRO, when the protection pin PRO detects the high level signal, the first MOS tube Q1 and the second MOS tube Q2 are conducted, so that current exists on the primary side of the first transformer T1, the current of corresponding voltage is generated on the secondary side of the first transformer T1 through the transformation processing of the first transformer T1, and the current is transmitted to a (rear-stage) load through the eighth diode D8.
The first feedback sub-circuit 113 includes a second optocoupler PC2, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a first voltage regulator ZD1, a sixth capacitor C6, and an eighth capacitor C8. The first terminal of the nineteenth resistor R19 is connected to the first terminal of the twentieth resistor R20 and to the seventh terminal of the first power sub-circuit 112 (i.e., the cathode of the eighth diode D8). The second terminal of the nineteenth resistor R19 is connected to the positive electrode of the transmitting terminal (PC 2A) of the second optocoupler PC2 and to the first terminal of the twenty-first resistor R21. The second terminal of the twenty-second resistor R20 is connected to the first terminal of the twenty-second resistor R22, the first terminal of the sixth capacitor C6, and the reference electrode of the first voltage regulator ZD 1. The negative electrode of the emitting end (PC 2A) of the second optocoupler PC2 is connected to the second end of the twenty-first resistor R21, the first end of the twenty-third resistor R23, and the cathode of the first voltage regulator ZD 1. A second terminal of the twenty-third resistor R23 is connected to a second terminal of the sixth capacitor C6. The second end of the twenty-second resistor R22 is grounded to the anode of the first voltage regulator ZD 1. The collector of the receiving end (PC 2B) of the second optocoupler PC2 is connected to the feedback pin FB of the power management chip U1 and the first end of the eighth capacitor C8. The emitter of the receiving end (PC 2B) of the second optocoupler PC2 is grounded to the second end of the eighth capacitor C8. After the power management chip U1 starts to work, a level signal is monitored through the protection pin PRO, when the protection pin PRO detects a high level signal, the first MOS tube Q1 and the second MOS tube Q2 are conducted, so that current exists on the primary side of the first transformer T1, the current of corresponding voltage is generated on the secondary side of the first transformer T1 through transformation processing of the first transformer T1, and the current is transmitted to a (rear-stage) load through the eighth diode D8 and is transmitted to the feedback pin FB of the power management chip U1 through the first feedback sub-circuit 113, so that the power management chip U1 can obtain the voltage value of the corresponding output voltage. It should be noted that, in fig. 2, two dashed boxes are labeled 113, and this labeling means that the electronic components in the two dashed boxes together form the first feedback sub-circuit 113, instead of two first feedback sub-circuits 113, and similarly, the second feedback sub-circuit 122.
The standby power circuit 12 includes a standby management chip U2, a second power sub-circuit 121, and a second feedback sub-circuit 122. The control pin GATE of the standby management chip U2 is connected to the first end of the second power sub-circuit 121, and the power pin VCC of the standby management chip U2 is connected to the second end of the second power sub-circuit 121 and the third end of the second resistor R2 module R2 for providing the second Voltage (VCC). The current detection pin CS of the standby management chip U2 is connected to the third end of the second power sub-circuit 121, the fourth end of the second power sub-circuit 121 is grounded, and the fifth end of the second power sub-circuit 121 is connected to the fifth end of the first resistor R1 module R1, the first end of the main board circuit 13, and the first end of the second feedback sub-circuit 122, for providing the first voltage (VoSTB). The sixth terminal of the second power sub-circuit 121 is used for accessing the power supply. In an alternative embodiment, the power supply may be mains. The second end of the second feedback sub-circuit 122 is connected to the feedback pin FB of the standby management chip U2, the third end of the second feedback sub-circuit 122 is connected to the protection pin PRO of the standby management chip U2, and the third end of the second feedback sub-circuit 122 is grounded. When the standby management chip U2 is in operation, a control signal is output to the first terminal of the second power sub-circuit 121 through the control pin GATE thereof to control the second power sub-circuit 121 to be turned on, thereby providing the first voltage to the power output control circuit 10 (VoSTB).
The second power sub-circuit 121 includes a power unit 1211 and a second transforming unit 1212. The first end of the power unit 1211 is connected to the control pin GATE of the standby management chip U2, the second end of the power unit 1211 is connected to the power supply pin VCC of the standby management chip U2 and the third end of the second resistor R2 module R2 (i.e., the second end of the sixth resistor R6), the third end of the power unit 1211 is connected to the current detection pin CS of the standby management chip U2, the fourth end of the power unit 1211 is grounded, the fifth end of the power unit 1211 is connected to the first end of the second transformer unit 1212, the sixth end of the power unit 1211 is connected to the positive electrode of the first electrolytic capacitor E1 and the second end of the second transformer unit 1212, the seventh end of the power unit 1211 is connected to the third end of the second transformer unit 1212, and the eighth end of the power unit 1211 is used for accessing the live wire terminal (L). The fourth terminal of the second transformer 1212 is connected to the fifth terminal of the first resistor R1 module R1 (i.e. the second terminal of the first resistor R1), the first terminal of the main board circuit 13, and the first terminal of the second feedback sub-circuit 122 for providing the first voltage (VoSTB). The fifth terminal of the second transforming unit 1212 is grounded.
The power unit 1211 includes a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-eighth resistor R30, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a tenth diode D10, an eleventh diode D11, a third electrolytic capacitor E3, and a third MOS transistor Q3. The first end of the twenty-fourth resistor R24 is connected to the first end of the twenty-fifth resistor R25, and the second end of the twenty-fourth resistor R24 is used for connecting to a live wire terminal (L). The second end of the twenty-fifth resistor R25 is connected to the power pin VCC of the standby management chip U2, the third end of the second resistor R2 module R2 (i.e., the second end of the sixth resistor R6), the first end of the eighth capacitor C8, the positive electrode of the third electrolytic capacitor E3, and the negative electrode of the twelfth electrode tube D10. The second end of the eighth capacitor C8 is grounded to the negative electrode of the third electrolytic capacitor E3. The anode of the twelfth pole tube D10 is connected to the first end of the second transforming unit 1212. The current detection pin CS of the standby management chip U2 is connected to the first end of the twenty-sixth resistor R26 and the first end of the ninth capacitor C9, and the second end of the ninth capacitor C9 is grounded. The second end of the twenty-sixth resistor R26 is connected to the first end of the twenty-seventh resistor R27, the first end of the twenty-eighth resistor R28, and the source of the third MOS transistor Q3. The second terminal of the twenty-seventh resistor R27 is grounded. The second end of the twenty-eighth resistor R28 is connected with the first end of the twenty-ninth resistor R29 and the grid electrode of the third MOS transistor Q3, and the second end of the twenty-ninth resistor R29 is connected with the control pin GATE of the standby management chip U2. The drain electrode of the third MOS transistor Q3 is connected to the anode of the eleventh diode D11 and the third terminal of the second transforming unit 1212. The cathode of the eleventh diode D11 is connected to the first terminal of the tenth capacitor C10 and the first terminal of the thirty-first resistor R30. The second end of the tenth capacitor C10 is connected to the second end of the thirty-first resistor R30, the positive electrode of the first electrolytic capacitor E1, and the second end of the second transforming unit 1212. When the standby management chip U2 is used for working, a control signal is output to the GATE of the third MOS transistor Q3 through the control pin GATE thereof, so as to control the third MOS transistor Q3 to be turned on, thereby providing the primary voltage for the second voltage transformation unit 1212.
The second transforming unit 1212 includes a second transformer T2, an eleventh capacitor C11, a thirty-first resistor R31, a twelfth diode D12, and a fourth electrolytic capacitor E4. The first end (pin 6) of the primary side of the second transformer T2 is connected to the second end of the tenth capacitor C10, the second end of the thirty-first resistor R30, and the positive electrode of the first electrolytic capacitor E1. The second end (pin 4) of the primary side of the second transformer T2 is connected to the drain of the third MOS transistor Q3 and the anode of the eleventh diode D11. A third terminal (pin 1) of the primary side of the second transformer T2 is connected to the anode of the twelfth pole tube D10, and a fourth terminal of the primary side of the second transformer T2 is grounded. The first terminal of the secondary side of the second transformer T2 is connected to the first terminal of the eleventh capacitor C11 and the anode of the twelfth diode D12. The second end of the eleventh capacitor C11 is connected to the first end of the thirty-first resistor R31, and the second end of the thirty-first resistor R31 is connected to the cathode of the twelfth diode D10, the anode of the fourth electrolytic capacitor E4, the fifth end of the first resistor R1 module R1 (i.e., the second end of the first resistor R1), the first end of the main board circuit 13, and the first end of the second feedback sub-circuit 122. The second end of the secondary side of the second transformer T2 is grounded to the second end of the fourth electrolytic capacitor E4.
The second feedback sub-circuit 122 includes a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a third optocoupler PC3, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, and a second voltage regulator ZD2. The first end of the thirty-second resistor R32 is connected to the first end of the thirty-third resistor R33 and the cathode of the twelfth diode D10, and the second end of the thirty-second resistor R32 is connected to the positive electrode of the emission end (PC 3A) of the third optocoupler PC3 and the first end of the thirty-fourth resistor R34. The second terminal of the thirty-third resistor R33 is connected to the first terminal of the twelfth capacitor C12, the first terminal of the thirty-fifth resistor R35, and the reference electrode of the second voltage regulator ZD2. The second terminal of the thirty-fifth resistor R35 is grounded to the anode of the second voltage regulator ZD2. A second terminal of the thirty-fourth resistor R34 is connected to a first terminal of a thirty-sixth resistor R36. The second terminal of the thirty-sixth resistor R36 is connected to the second terminal of the thirty-fourth resistor R34, the negative electrode of the emitter (PC 3A) of the third optocoupler PC3, and the cathode of the second voltage regulator ZD2. The collector of the receiving end (PC 3B) of the third optocoupler PC3 is connected to the first end of the thirteenth capacitor C13 and the feedback pin FB of the standby management chip U2. The emitter of the receiving end (PC 3B) of the third optocoupler PC3 is grounded to the second end of the thirteenth capacitor C13, the first end of the thirty-seventh resistor R37, and the first end of the fourteenth capacitor C14. The second terminal of the thirty-seventh resistor R37 is connected to the second terminal of the fourteenth capacitor C14, the first terminal of the thirty-eighth resistor R38, and the protection pin BO of the standby management chip U2. A second end of the thirty-eighth resistor R38 is connected to a first end of the thirty-ninth resistor R39, and a second end of the thirty-ninth resistor R39 is adapted to be connected to a live terminal (L).
When the cathode of the first diode D1 of the power output control circuit 10 receives the low-level control signal (ps_on), the voltage of the non-inverting input terminal of the operational amplifier U1B is lower than that of the inverting input terminal thereof, so that the output terminal of the operational amplifier U1B is in a low-level state, the first optocoupler PC1 is turned ON, the base of the first triode Q1 is pulled down by the receiving terminal of the first optocoupler PC1, the first triode Q1 is turned off, and the protection pin PRO of the power management chip U1 connected to the collector of the first triode Q1 is at a high level, so that the power management chip U1 controls the main power supply circuit 11 corresponding to be turned ON to supply power to the corresponding load, and when the corresponding load is shorted, each device will not be affected by the short circuit and lose efficacy, thereby improving the reliability of the power output control circuit 10.
The embodiment of the application also provides electronic equipment which comprises the power output control circuit or the switching power supply.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
It should be noted that, in the present utility model, unless explicitly specified and limited otherwise, a first feature may be "on" or "off" a second feature, either by direct contact of the first and second features or by indirect contact of the first and second features via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The present utility model is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present utility model and the inventive concept thereof, can be replaced or changed within the scope of the present utility model.
Claims (13)
1. The power output control circuit is characterized by comprising a first diode, an operational amplifier, a first resistor module, a first optocoupler, a second resistor module and a first triode;
The anode of the first diode is connected with the first end of the first resistor module and the non-inverting input end of the operational amplifier, and the cathode of the first diode is used for receiving a level control signal;
The second end of the first resistor module is connected with the inverting input end of the operational amplifier, the third end of the first resistor module is grounded, the fourth end of the first resistor module is connected with the positive electrode of the transmitting end of the first optocoupler, and the fifth end of the first resistor module is used for being connected with a first voltage;
The output end of the operational amplifier is connected with the negative electrode of the emitting end of the first optical coupler, the collector electrode of the receiving end of the first optical coupler is connected with the first end of the second resistor module and the base electrode of the first triode, and the emitter electrode of the receiving end of the first optical coupler is grounded with the second end of the second resistor module and the emitter electrode of the first triode; the third end of the second resistor module is used for being connected with a second voltage, the collector electrode of the first triode is used for being connected with a protection pin of a power management chip, and the power management chip is used for controlling a main power supply circuit corresponding to conduction to supply power for a corresponding load when the protection pin is in a high level.
2. The power output control circuit of claim 1 wherein the first resistor module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;
The first end of the first resistor is connected with the anode of the first diode, the first end of the second resistor and the non-inverting input end of the operational amplifier, the second end of the first resistor is connected with the first end of the third resistor and the first end of the fourth resistor, and the second end of the first resistor is used for being connected with a first voltage;
the second end of the second resistor is grounded to the first end of the fifth resistor;
The second end of the third resistor is connected with the second end of the fifth resistor and the inverting input end of the operational amplifier;
And the second end of the fourth resistor is connected with the positive electrode of the emitting end of the first optocoupler.
3. The power output control circuit of claim 1 wherein the second resistance module comprises a sixth resistance and a seventh resistance;
The first end of the sixth resistor is connected with the first end of the seventh resistor, the collector of the receiving end of the first optocoupler and the base of the first triode, and the second end of the sixth resistor is used for being connected with a second voltage;
The second end of the seventh resistor is grounded.
4. A switching power supply comprising a standby power supply circuit, a main board circuit, a main power supply circuit, and the power supply output control circuit of any one of claims 1 to 3;
The first end of the standby power supply circuit is connected with the first end of the power supply output control circuit and the first end of the main board circuit and is used for providing a first voltage for the power supply output control circuit;
The second end of the standby power supply circuit is connected with the second end of the power supply output control circuit and is used for providing a second voltage for the power supply output control circuit, the third end of the standby power supply circuit is used for being connected with a power supply, and the fourth end of the standby power supply circuit is grounded;
the second end of the main board circuit is connected with the third end of the power output control circuit and is used for sending a level control signal to the power output control circuit, and the third end of the main board circuit is grounded;
the first end of the main power supply circuit is connected with the fourth end of the power supply output control circuit, the fifth end of the power supply output control circuit is grounded, and the fourth end of the power supply output control circuit is in a high level when the level control signal received by the third end of the power supply output control circuit is in a low level control signal, so that the first end of the main power supply circuit is also in the high level;
The second end of the main power supply circuit is used for being connected with a power supply, the third end of the main power supply circuit is used for being connected with a load, the fourth end of the main power supply circuit is grounded, and the main power supply circuit is used for being conducted when the first end of the main power supply circuit is in a high level so as to transmit the voltage of the power supply to the load.
5. The switching power supply of claim 4 wherein the main power supply circuit comprises a power management chip, an input sub-circuit, a first power sub-circuit, and a first feedback sub-circuit;
the first end of the input sub-circuit is connected with the high-voltage starting pin of the power management chip and the first end of the first power sub-circuit, the second end of the input sub-circuit is grounded, and the third end of the input sub-circuit is used for being connected with a power supply;
The high-end pin of the power management chip is connected with the second end of the first power sub-circuit, the first power pin of the power management chip is connected with the third end of the first power sub-circuit, the low-end pin of the power management chip is connected with the fourth end of the first power sub-circuit, the current detection pin of the power management chip is connected with the fifth end of the first power sub-circuit, the protection pin of the power management chip is connected with the fourth end of the power output control circuit, and the feedback pin of the power management chip is connected with the first end of the first feedback sub-circuit; the power management chip is used for controlling the first power sub-circuit to be conducted when the protection pin detects a high-level signal;
The sixth end of the first power sub-circuit is grounded, the seventh end of the first power sub-circuit is connected with the second end of the first feedback sub-circuit, and the seventh end of the first power sub-circuit is used for outputting voltage to a load.
6. The switching power supply of claim 5 wherein said input subcircuit includes a second diode, a third diode, a fourth diode, a fifth diode, a first electrolytic capacitor, and an eighth resistor;
the anode of the second diode is connected with the cathode of the third diode, and the anode of the second diode is used for being connected with a live wire terminal;
The cathode of the second diode is connected with the cathode of the fourth diode, the anode of the first electrolytic capacitor and the first end of the eighth resistor;
The anode of the third diode, the anode of the fifth diode and the cathode of the first electrolytic capacitor are grounded;
The anode of the third diode is connected with the cathode of the fifth diode, and the anode of the third diode is used for being connected with a zero line terminal;
The second end of the eighth resistor is connected with a high-voltage starting pin of the power management chip, and the power management chip is used for starting work when a voltage value received by the high-voltage starting pin reaches a preset threshold value.
7. The switching power supply of claim 6 wherein said first power subcircuit includes a high-side unit, a low-side unit, a current detection unit, and a first voltage transformation unit;
The first end of the high-end unit is connected with the high-end pin of the power management chip, the second end of the high-end unit is connected with the first end of the eighth resistor, and the third end of the high-end unit is connected with the first power pin of the power management chip, the first end of the low-end unit and the first end of the first voltage transformation unit;
The second end of the low-end unit is connected with a low-end pin of the power management chip, the third end of the low-end unit is connected with the second end of the first voltage transformation unit and the first end of the current detection unit, and the fourth end of the low-end unit is grounded;
The second end of the current detection unit is connected with a current detection pin of the power management chip, and the third end of the current detection unit is grounded;
The third end of the first voltage transformation unit is grounded, the fourth end of the first voltage transformation unit is connected with the second end of the first feedback sub-circuit, and the first voltage transformation unit is used for outputting voltage to a load through the fourth end after performing voltage transformation treatment on the voltage received by the first end and the second end.
8. The switching power supply of claim 7 wherein the high-side unit comprises a sixth diode, a ninth resistor, a tenth resistor, an eleventh resistor, a first MOS transistor, and a first capacitor;
the first end of the ninth resistor is connected with the high-end pin of the power management chip and the cathode of the sixth diode;
The anode of the sixth diode is connected with the first end of the tenth resistor, and the second end of the tenth resistor is connected with the second end of the ninth resistor, the first end of the eleventh resistor and the grid electrode of the first MOS tube;
The drain electrode of the first MOS tube is connected with the first end of the eighth resistor and the first end of the first capacitor;
The source electrode of the first MOS tube is connected with the second end of the eleventh resistor, the second end of the first capacitor, the first power pin of the power management chip, the first end of the low-end unit and the first end of the first voltage transformation unit.
9. The switching power supply of claim 7 wherein the low-side unit includes a seventh diode, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a second MOS transistor, a second capacitor, and a third capacitor;
The first end of the twelfth resistor is connected with the low-end pin of the power management chip and the cathode of the seventh diode;
an anode of the seventh diode is connected with the first end of the thirteenth resistor;
The second end of the thirteenth resistor is connected with the second end of the twelfth resistor, the first end of the fourteenth resistor and the grid electrode of the second MOS tube;
The drain electrode of the second MOS tube is connected with the third end of the high-end unit, the first power pin of the power management chip, the first end of the first transformation unit and the first end of the second capacitor;
The source electrode of the second MOS tube, the second end of the fourteenth resistor, the second end of the second capacitor and the first end of the third capacitor are grounded;
the second end of the third capacitor is connected with the second end of the first voltage transformation unit and the first end of the current detection unit.
10. The switching power supply according to claim 7, wherein the current detecting unit includes a fourth capacitor, a fifth capacitor, a fifteenth resistor, and a sixteenth resistor;
The first end of the fourth capacitor is connected with the current detection pin of the power management chip, the first end of the fifteenth resistor and the first end of the sixteenth resistor;
A second end of the fourth capacitor is grounded to a second end of the fifteenth resistor;
the second end of the sixteenth resistor is connected with the first end of the fifth capacitor, and the second end of the fifth capacitor is connected with the third end of the low-end unit and the second end of the first voltage transformation unit.
11. The switching power supply of claim 7, wherein the first transforming unit comprises a first transformer, an eighth diode, a ninth diode, and a second electrolytic capacitor;
A first end of the primary side of the first transformer is connected with a third end of the high-end unit, a first power pin of the power management chip and a first end of the low-end unit;
a second end of the primary side of the first transformer is connected with a third end of the low-end unit and the first end of the current detection unit;
A first end of a secondary side of the first transformer is connected with an anode of the eighth diode;
The cathode of the eighth diode is connected with the cathode of the ninth diode, the anode of the second electrolytic capacitor and the second end of the first feedback sub-circuit, and the cathode of the eighth diode is used for outputting voltage to a load;
the second end of the secondary side of the first transformer is grounded with the negative electrode of the second electrolytic capacitor;
an anode of the ninth diode is connected with a third terminal of the secondary side of the first transformer.
12. The switching power supply of claim 5 wherein the first feedback sub-circuit comprises a second optocoupler, a nineteenth resistor, a twentieth resistor, a twenty first resistor, a twenty second resistor, a twenty third resistor, a first voltage regulator, a sixth capacitor, and a seventh capacitor;
A first end of the nineteenth resistor is connected with the first end of the twentieth resistor and a seventh end of the first power sub-circuit;
The second end of the nineteenth resistor is connected with the positive electrode of the emitting end of the second optocoupler and the first end of the twenty first resistor;
The second end of the twenty-second resistor is connected with the first end of the twenty-second resistor, the first end of the sixth capacitor and the reference electrode of the first voltage stabilizer;
the negative electrode of the emitting end of the second optocoupler is connected with the second end of the twenty-first resistor, the first end of the twenty-third resistor and the cathode of the first voltage stabilizer;
the second end of the twenty-third resistor is connected with the second end of the sixth capacitor;
The second end of the twenty-second resistor is grounded to the anode of the first voltage stabilizer;
The collector of the receiving end of the second optocoupler is connected with the feedback pin of the power management chip and the first end of the seventh capacitor;
And the emitter of the receiving end of the second optocoupler is grounded to the second end of the seventh capacitor.
13. An electronic system comprising the power supply output control circuit of any one of claims 1-3 or the switching power supply of any one of claims 4-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322353222.9U CN220935020U (en) | 2023-08-30 | 2023-08-30 | Power output control circuit, switching power supply and electronic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322353222.9U CN220935020U (en) | 2023-08-30 | 2023-08-30 | Power output control circuit, switching power supply and electronic system |
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| CN220935020U true CN220935020U (en) | 2024-05-10 |
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| CN202322353222.9U Active CN220935020U (en) | 2023-08-30 | 2023-08-30 | Power output control circuit, switching power supply and electronic system |
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| CN (1) | CN220935020U (en) |
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