WO2015070481A1 - 一种电源输出装置及电源输出装置控制方法 - Google Patents

一种电源输出装置及电源输出装置控制方法 Download PDF

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Publication number
WO2015070481A1
WO2015070481A1 PCT/CN2013/087857 CN2013087857W WO2015070481A1 WO 2015070481 A1 WO2015070481 A1 WO 2015070481A1 CN 2013087857 W CN2013087857 W CN 2013087857W WO 2015070481 A1 WO2015070481 A1 WO 2015070481A1
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Prior art keywords
circuit
voltage
output
resistor
power conversion
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PCT/CN2013/087857
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English (en)
French (fr)
Inventor
吴智
汪本强
闫向阳
张亚军
曹树坚
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深圳市航嘉驰源电气股份有限公司
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Publication of WO2015070481A1 publication Critical patent/WO2015070481A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device

Definitions

  • the invention belongs to the field of power supply control, and in particular relates to a power output device and a power output device control method.
  • the functional requirements of the terminal load or the system are ever-changing, and the requirements for the power supply are also diversified.
  • the technical solutions of the existing power supply are mainly the following two types:
  • the terminal or the system when the AC input voltage is normal, after the standby voltage output is normal, the terminal or the system sends a signal to the control circuit, and the control circuit outputs a signal to control the working voltage to start output, but the standby voltage still works normally.
  • the control circuit As a power supply for the terminal or system.
  • the terminal or the system when the AC input voltage is normal, after the standby voltage output is normal, the terminal or the system sends a signal to the control circuit, and the control circuit outputs a signal to control the working voltage to start outputting.
  • the control power supply When the working voltage output is normal, the control power supply The control signal is sent to control the first switching circuit to be turned off so that the standby power supply has no output, and the second switching circuit is controlled to be turned on. At this time, the energy of the standby voltage is obtained by the operating voltage, but the standby power supply still works normally.
  • the standby voltage and the operating voltage are respectively controlled by two power conversions, and two power supplies and two control circuits are required.
  • the standby power consumption requirements for the power supply are getting lower and lower, and the cost requirements are more and more demanding.
  • these two solutions pose great challenges in terms of cost, size and reliability of the product. Therefore, it is necessary to design a power supply scheme that satisfies the requirements of existing terminals or systems while meeting the requirements of high power density.
  • the invention provides a power output device and a power output device control method, which aims to solve the problem that two power sources and two power source control circuits are required in the existing terminal load or system, and the circuit design is complicated and the power consumption is high.
  • the present invention is implemented as follows:
  • a power output device includes:
  • a power conversion circuit including at least a first feedback circuit and a second feedback circuit
  • the input end of the power conversion circuit is connected to an alternating current power source, and the alternating current is converted into direct current and outputted from the output end thereof.
  • the output end of the power conversion circuit is connected to the load as a first path voltage, and the output end of the power conversion circuit is connected. Up to an input end of the voltage switching circuit, an output end of the voltage switching circuit is connected to a load as a second path voltage;
  • An input end of the first feedback circuit is connected to an output end of the power conversion circuit, and is configured to collect a first path voltage outputted by an output end of the power conversion circuit and feed back to the power conversion circuit;
  • An output end of the first control circuit is connected to a control end of the voltage switching circuit, and is configured to generate a voltage output control signal or a voltage output interrupt control signal to control the voltage switching circuit to output a second voltage or stop outputting a second a circuit voltage, and transmitting the voltage output control signal or the voltage output interrupt control signal to the second control circuit;
  • the input end of the second feedback circuit is connected to the output end of the voltage switching circuit, and is configured to collect a second circuit voltage outputted by the output end of the voltage switching circuit and feed back to the power conversion circuit;
  • An input end of the second control circuit is connected to an output end of the first control circuit, an output end of the second control circuit is opposite to a control end of the first feedback circuit and a control end of the second feedback circuit Connecting, the second control circuit is configured to adjust the first feedback circuit according to the voltage output control signal when the first control circuit controls the output second voltage and the first feedback circuit is disabled according to the collected voltage value
  • the first feedback circuit maintains a disabled state
  • the second control circuit is further configured to adjust the voltage collected by the first feedback circuit according to the voltage output interrupt control signal to disable the second feedback circuit and provide the feedback signal to the first feedback circuit.
  • the present invention also provides a power output device control method, the power output device includes a power conversion circuit, a voltage switching circuit, and the power output device further includes at least a first feedback circuit and a second feedback circuit, the power conversion circuit
  • the input terminal is connected to an alternating current power source, and the alternating current power is converted into direct current output from the output end thereof, the output end of the power conversion circuit is connected to the load as a first path voltage, and the output end of the power conversion circuit is connected to the voltage switch
  • An input end of the circuit, the output end of the voltage switching circuit is connected to the load as a second path voltage
  • the first feedback circuit is configured to sample the first path voltage and feed back to the power conversion circuit
  • the second feedback circuit For sampling the second voltage and feeding back to the power conversion circuit, the method includes:
  • the first control circuit converts the standby voltage outputted by the power conversion circuit to the operating voltage of the load according to the control signal outputted by the load when the load is in different operating states, so that the load is in standby and normal operation. Only one power conversion circuit is needed, and the power control circuit provided by the invention has a simple structure and reduces power loss.
  • FIG. 1 is a schematic diagram of an embodiment of a power output device according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of another embodiment of a power output device according to an embodiment of the present invention.
  • FIG. 3 is a circuit structural diagram of a voltage switching circuit in a power output device according to an embodiment of the present invention.
  • FIG. 4 is a circuit structural diagram of a second control circuit and a first feedback circuit in a power output device according to an embodiment of the present invention
  • FIG. 5 is a circuit structural diagram of a second control circuit and a second feedback circuit in a power output device according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of another embodiment of a power output device according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of another embodiment of a power output device according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an embodiment of a method for controlling a power output device according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of another embodiment of a method for controlling a power output device according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of another embodiment of a method for controlling a power output device according to an embodiment of the present invention.
  • FIG. 11 is a waveform diagram of output voltage switching in a method of controlling a power output device according to an embodiment of the present invention.
  • FIG. 1 shows a circuit structure of a power supply control circuit according to an embodiment of the present invention. For convenience of description, only parts related to the embodiment of the present invention are listed, which are described in detail as follows:
  • An embodiment of the present invention provides an embodiment of a power output device, including:
  • a power output device includes:
  • the power output device further includes at least a first feedback circuit 203 and a second feedback circuit 204;
  • the input end of the power conversion circuit 201 is connected to an alternating current power source, and the alternating current power is converted into a direct current power VS outputted from the output end thereof.
  • the output end of the power conversion circuit 201 is connected as a first path voltage to the load 100, and the power conversion circuit is
  • the output of the voltage switching circuit 202 is connected to the input of the voltage switching circuit 202, the output of the voltage switching circuit 202 is connected to the load 100 as a second way voltage V2;
  • the input end of the first feedback circuit 203 is connected to the output end of the power conversion circuit 201, for collecting the first circuit voltage outputted by the output end of the power conversion circuit 201 and fed back to the power conversion circuit 201;
  • the output end of the first control circuit 205 is connected to the control end of the voltage switching circuit 202 for issuing a voltage output control signal or a voltage output interrupt control signal to control the voltage switching circuit 202 to output a second voltage or stop. Outputting a second voltage and transmitting a voltage output control signal or a voltage output interrupt control signal to the second control circuit 202;
  • the input end of the second feedback circuit 204 is connected to the output of the voltage switching circuit 202, for collecting the second voltage outputted by the output of the voltage switching circuit 202 and fed back to the power conversion circuit 201;
  • An input end of the second control circuit 206 is connected to an output end of the first control circuit 205, an output end of the second control circuit 206 and a control end of the first feedback circuit 203 and the second feedback
  • the control terminal of the circuit 204 is connected, and the second control circuit 204 is configured to output a control signal according to the voltage when the first control circuit 205 controls the output of the second way voltage and the first feedback circuit 203 is disabled according to the collected voltage value. Adjusting the first feedback circuit 203 to maintain the first feedback circuit 203 in a disabled state; the second control circuit 206 is further configured to adjust the voltage collected by the first feedback circuit 203 according to the voltage output interrupt control signal The second feedback circuit 204 is disabled and the first feedback circuit provides a feedback signal.
  • An input end of the power conversion circuit 201 is connected to an alternating current AC, and an output end is connected to the load 100.
  • the load 100 is connected to the first control circuit 205, and the first control circuit 205 is in a standby state and a normal working state of the load 100.
  • the control point and the output device respectively output a standby voltage and a working voltage, the first path voltage is a standby voltage, and the second path voltage is an operating voltage.
  • the load is a motherboard controller disposed in a device including but not limited to a computer, a television, etc.
  • the load includes two working states of standby and normal operation, and the standby voltage and the operating voltage output by the power output device may be The same can be different.
  • a DC-DC power converter can be connected in series with the output of the voltage output device, so that the power output device can output multiple different voltage values, which is not limited herein.
  • the working process of the power supply and the load is: when the power supply is powered on, the standby voltage is output to the standby circuit in the load, and the load outputs the standby control signal, the standby circuit works stably, the load outputs the work control signal, and the power supply receives the work control.
  • the signal outputs the working voltage and the load enters the power-on state.
  • the load When the load enters the standby state, the load outputs a standby control signal to the first control circuit, and the first control circuit outputs a control signal to control the voltage switching circuit to stop working and sends a signal to the second control circuit, and the voltage switching circuit cannot output the power conversion circuit.
  • the voltage is converted to the working voltage of the load, only the standby voltage is input to the load, and the second feedback circuit is disabled.
  • the first feedback circuit provides a feedback signal, that is, the second feedback circuit stops working and switches to the first feedback circuit to work.
  • the load When the load is working, the load outputs a working control signal to the first control circuit, and the first control circuit controls the voltage switching circuit to operate and sends a signal to the second control circuit, and converts the standby voltage outputted by the power conversion circuit into a working voltage of the load for output.
  • the first control circuit controls the output of the second circuit voltage, the first feedback circuit is disabled according to the collected voltage value, and the second control circuit adjusts the first feedback circuit to make the first feedback according to the voltage output control signal
  • the circuit remains in a disabled state, at this time, the second feedback circuit Supply feedback signal, a second feedback circuit even if the first feedback circuit and is switched to stop working.
  • the first feedback circuit 203 includes: a first voltage collecting circuit 2031 that collects a first path voltage;
  • the first error amplifier 2032 is connected to the first voltage collecting circuit 2031 for adjusting the voltage value collected by the first voltage collecting circuit 2031 and outputting the first error amplifier 2032;
  • the first voltage output circuit 2033 is connected to the first error amplifier 2032 for outputting the voltage signal according to the first error amplifier 2032 to the power conversion circuit 201;
  • the second feedback circuit 204 includes: a second voltage collecting circuit 2041 that collects a second path voltage;
  • the second voltage amplifier circuit 2041 is connected to the second voltage amplifier circuit 2042 for adjusting the voltage value collected by the second voltage collecting circuit 2041;
  • the second voltage output circuit 2043 Connected to the second error amplifier 2042, the second voltage output circuit 2043 for outputting to the power conversion circuit according to the voltage signal output by the second error amplifier 2042;
  • the second control circuit 206 is connected to the first voltage collecting circuit 2031 and the second voltage collecting circuit 2041 for controlling the first voltage collecting circuit 2031 and the second voltage collecting circuit 2041. Adjusting a feedback state of the first feedback circuit and the second feedback circuit;
  • the first acquisition circuit 2031 can use a voltage dividing resistor to collect the first voltage; the first error amplifier 2032 adjusts the voltage value collected by the first voltage collection circuit 2031, and outputs the first voltage output circuit 2033.
  • a voltage transmitting device such as a photocoupler may be used to output a voltage to the power conversion circuit 201 according to a voltage signal output by the first error amplifier 2032, and the second control circuit 206 may adjust the first acquisition circuit 2031 by adjusting the voltage.
  • the voltage resistance value is used to adjust the voltage value collected by the first voltage collecting circuit 2031 to control the feedback state of the first feedback circuit 203.
  • the second acquisition circuit 2041 can use a voltage dividing resistor to collect the second voltage; the second error amplifier 2042 adjusts the voltage value collected by the second voltage collection circuit 2041, and outputs the second voltage output circuit 2043.
  • a voltage transmitting device such as a photocoupler may be used to output a voltage to the power conversion circuit 201 according to a voltage signal output by the second error amplifier, and the second control circuit 206 may adjust a voltage division of the second acquisition circuit 2041.
  • the resistance value is used to adjust the voltage value collected by the second voltage collecting circuit 2041 to control the feedback state of the second feedback circuit 204.
  • the power conversion circuit 202 When no load is connected, the power conversion circuit 202 outputs the first path voltage. At this time, the first feedback circuit 203 operates, and the power conversion circuit 202 outputs the first circuit voltage as the first voltage.
  • the load When the user controls the load to work, the load outputs a working control signal to the first control circuit 205, and the first control circuit 205 controls the voltage switching circuit 202 to operate to output the second voltage and send the voltage output signal to the second control circuit 206.
  • the first control circuit 205 controls the output of the second way voltage, and the second feedback circuit 204 starts to collect the second way voltage and feeds back to the power conversion circuit 201, by setting the acquisition of the first voltage collecting circuit 2031 and the second voltage collecting circuit 2041.
  • the first feedback circuit 203 a resistance value that reduces a voltage value collected by the first feedback circuit 203 such that the first error amplifier outputs a control signal to cause the first feedback circuit to stop feedback, that is, the first feedback circuit 203 is disabled according to the collected voltage value.
  • the two feedback circuits start to work, and the voltage value fed back to the power conversion circuit 201 by the second feedback circuit 204 is higher than the first feedback circuit 20 3 before the feedback is stopped, the voltage value of the power conversion circuit 201 is fed back to the power conversion circuit 201.
  • the power conversion circuit 201 compares the voltage value sent by the received second feedback circuit 204 with the reference voltage through an internal voltage comparator to adjust the output voltage duty ratio.
  • the power conversion circuit 201 adjusts the duty ratio so that the output voltage is the second voltage value, then the first The circuit voltage and the second voltage output are the second voltage value, and the second voltage value is smaller than the first voltage value, and the voltage value collected by the first collecting circuit 2031 becomes smaller because the second voltage value becomes smaller, further making the first
  • the error amplifier 2032 outputs a control signal to stop the first voltage delivery circuit 2033 from feeding back the voltage, and the first feedback circuit 203 continues to stop working, while the second control circuit 206 adjusts by paralleling a resistance across the collecting resistor of the first voltage collecting circuit 2031.
  • the voltage value collected by the first voltage collecting circuit 2031 causes the voltage value collected by the first voltage collecting circuit 2031 to become smaller.
  • Step 1 causes the first feedback circuit 203 to stop working, and adjusts the voltage value collected by the second voltage collecting circuit 2041 by adjusting a voltage value collected by the second voltage collecting circuit 2041 by a resistor connected in parallel across the collecting resistor of the second voltage collecting circuit 2041.
  • the power conversion circuit 201 adjusts the duty ratio again so that the output voltage value is the third voltage value. That is, the first voltage and the second voltage value are third voltage values, and the third voltage value is greater than the first voltage value and the second voltage value.
  • the first control circuit 205 When the user controls the load to enter the standby state or the second voltage value has a failure condition such as overvoltage or overcurrent, the first control circuit 205 outputs a control signal to control the voltage switching circuit 202 to stop working and sends a voltage output interrupt control signal to the second control.
  • the circuit 206, the first control circuit 205 disables the second feedback circuit 204 by adjusting the voltage collected by the first feedback circuit 203 by an output voltage output interrupt control signal, and the second control circuit 206 interrupts the control signal according to the voltage output.
  • Controlling the time adjustment controlling the time point at which the voltage adjustment of the first voltage sampling circuit 2031 is prior to the voltage adjustment of the second voltage sampling circuit 2041, so that the resistance across the collecting resistor of the first voltage collecting circuit 2031 is first Disconnecting the second feedback circuit 204, the second output voltage still exists, but the second voltage collecting circuit 2041 has not been adjusted, and the voltage supplied from the first feedback circuit 203 to the power conversion circuit 201 is increased.
  • the power conversion circuit 201 adjusts the output voltage duty ratio to lower the output voltage value and output the voltage The value is restored to the first voltage value.
  • the second control circuit 205 starts to adjust the voltage of the second voltage sampling circuit 2041 to disconnect the resistance across the collecting resistor of the second voltage collecting circuit 2041.
  • the second control circuit 205 stops participating in the loop feedback of the second feedback circuit.
  • the second feedback circuit stops working, and the first feedback circuit works; when the second voltage has an output, the first feedback circuit stops working, and the second feedback circuit works,
  • the feedback circuit is switched from the second feedback circuit to the first feedback circuit.
  • the first control circuit issues a voltage output interrupt control signal to adjust the first
  • the voltage collected by the feedback circuit disables the second feedback circuit, but at this time, the second voltage still has an output, and the second control circuit adjusts the voltage of the first feedback circuit and adjusts the feedback voltage of the first feedback circuit to implement feedback. And outputting the first voltage, achieving a smooth transition of the first voltage and the second voltage during the mutual switching between the first feedback circuit and the second feedback circuit.
  • the output process of the power output device in this embodiment is described by taking the feedback circuit including the first feedback circuit and the second feedback circuit as an example. It can be understood that in practical applications.
  • the feedback circuit further includes a third feedback circuit and a fourth feedback circuit to implement an output process of the power output device, which is not limited herein.
  • the voltage switching circuit 202 is the first NMOS transistor Q1;
  • the drain of the first NMOS transistor is the power terminal of the voltage switching circuit 202, and the power terminal is connected to the output end of the associated power conversion circuit 201.
  • the source of the first NMOS transistor Q1 is the output terminal of the voltage switching circuit 202, and the output terminal Connected to the load, the gate of the first NMOS transistor Q1 is the control terminal of the voltage switching circuit 202, and the control terminal is connected to the first control circuit 205.
  • the second control circuit 206 includes: a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, and a nineteenth resistor R19, 20 resistor R20, first capacitor C1, second Zener diode ZD1, fourth NMOS transistor Q4 and PNP type transistor Q5;
  • the first end of the twentieth resistor R20 is an input end of the second control circuit 206, and is connected to the output end of the first control circuit 205.
  • the second end of the twentieth resistor R20 and the base of the PNP type transistor Q5 are second stable.
  • the cathode of the pressure tube ZD2 is connected to the first end of the nineteenth resistor R19, and the first end of the eighteenth resistor R18 is connected to the output end of the voltage switching circuit 202 for receiving the second voltage output by the voltage switching circuit 202.
  • the second end of the eighteenth resistor R18 is connected to the emitter of the PNP transistor Q5, the first end of the seventeenth resistor R17, the first end of the first capacitor C1, and the gate of the fourth NMOS transistor Q4, PNP
  • the collector of the transistor Q5 and the second end of the nineteenth resistor R19, the anode of the second Zener diode ZD2, the second end of the seventeenth resistor R17, the second end of the first capacitor C1, and the fourth NMOS transistor Q4 The source is connected to the equipotential ground, the drain of the fourth NMOS transistor Q4 is connected to the first end of the sixteenth resistor R16, and the second end of the sixteenth resistor R16 is the first control output of the second control circuit 206. end;
  • the first voltage collecting circuit 2031 in the first feedback circuit 203 includes: a twenty-first resistor R21 and a twenty-second resistor R22; the first voltage output circuit 2033 is a third photocoupler U3;
  • the first end of the twenty-first resistor R21 is an input end of the first feedback circuit 203 for receiving the first path voltage VS outputted by the power conversion circuit, and the second end of the twenty-first resistor R21 and the second twelve resistor R22
  • the first end is connected to the first end of the first error amplifier BD1
  • the second end of the twenty-second resistor R22 is connected to the equal potential
  • the common connection end of the twenty-first resistor R21 and the twenty-second resistor R22 is a control circuit of the feedback circuit 203
  • the anode of the light emitting diode in the third photocoupler U3 is connected to the output end of the power conversion circuit 201
  • the second terminal of the first error amplifier BD1 is connected to the equal potential
  • the input end of the photodetector in the third photocoupler U3 is the output end of the first feedback circuit
  • the second control circuit 206 includes: a twenty-fifth resistor R25, a sixth NMOS transistor Q6, a twenty-third resistor R23, and a twenty-fourth resistor. R24 and a second capacitor C2;
  • the first end of the twenty-third resistor R23 is connected to the output end of the voltage switching circuit 202 for receiving the second voltage V2 output by the voltage switching circuit 202, and the second end and the sixth end of the twenty-third resistor R23
  • the gate of the NMOS transistor Q6, the first end of the second capacitor C2, and the first end of the twenty-fourth resistor R24 are connected, the source of the sixth NMOS transistor Q6 and the second end of the second capacitor C2 and the twenty-fourth
  • the second end of the resistor R24 is connected to the equipotential ground, the drain of the sixth NMOS transistor Q6 is connected to the first end of the twenty-fifth resistor R25, and the second end of the twenty-fifth resistor R25 is the second control circuit 206.
  • the second voltage collecting circuit 2041 in the second feedback circuit 204 includes: a twenty-sixth resistor R26 and a twenty-seventh resistor R27; the second voltage output circuit 2043 is a fourth photocoupler U4;
  • the first end of the twenty-sixth resistor R26 is an input end of the second feedback circuit 204 for receiving the second voltage V2 output by the voltage switching circuit 202, and the second end and the second end of the twenty-sixth resistor R26
  • the first end of the seventeen resistor R27 and the first end of the second error amplifier BD2 are connected, the second end of the twenty-seventh resistor R27 is connected to the equipotential ground, and the second sixteen resistor R26 and the twenty-seventh resistor R27 are common.
  • connection end is the control end of the second feedback circuit 214
  • the anode of the LED in the fourth photocoupler U4 is connected to the output end of the voltage switching circuit 202
  • the third terminal is connected
  • the second end of the second error amplifier BD2 is connected to the equal potential
  • the input end of the photodetector in the fourth photocoupler U4 is the output end of the second feedback circuit 204 for connecting the power conversion circuit 201.
  • the output end of the photoreceiver in the fourth photocoupler U4 is connected to an equipotential ground.
  • the sixteenth resistor R16 and the twenty-fifth resistor R25 are used for controlling the voltage values collected by the first feedback circuit and the second feedback circuit, and the first capacitor C1 controls the fourth NMOS transistor Q4 when the charging is full. Pass, and when the fifth transistor Q5 is turned on and the fifth transistor Q5, the Zener Z1 and the nineteenth resistor R19 and the tens of resistor R20 constitute a fast discharge control circuit, the second capacitor C2 is fully charged The sixth NMOS transistor Q6 is controlled to be turned on, and forms a discharge loop with the twenty-fourth resistor R24.
  • the first capacitor C1 and the second capacitor are first input through the eighteenth resistor R18 and the second terminal voltage V2 through the first end of the twenty-third resistor R23.
  • C2 is charged, at this time, the fourth NMOS transistor Q4 and the sixth NMOS transistor Q6 Without conduction, the twenty-sixth resistor R26 and the twenty-seventh resistor R27 divide the voltage of the second circuit and supply the collected voltage to the power conversion circuit by setting the twenty-first resistor R21 and the twenty-second resistor R22.
  • the resistance value of the twenty-sixth resistor R26 and the twenty-seventh resistor R27 is such that the voltage value collected by the twenty-seventh resistor R27 is higher than the voltage value collected by the twenty-second resistor R22, and is collected according to the twenty-second resistor R22.
  • the voltage value causes the first error amplifier BD1 to output a voltage control signal to cause the first feedback circuit to stop feedback, and the power conversion circuit compares the voltage value collected by the received twenty-seventh resistor R27 with the reference voltage through an internal voltage comparator.
  • the power conversion circuit adjusts the duty cycle so that the output voltage is the second voltage value V2a, that is, the first voltage and the second voltage output are the second voltage value V2a, the first The second voltage value V2a is smaller than the first voltage value Va, and the output voltage of the power conversion circuit becomes lower, so that the voltage value collected by the twenty-second resistor R22 is further lowered, so that the first error amplifier BD1 continues to output power.
  • the voltage control signal causes the first feedback circuit to stop feedback.
  • the fourth NMOS transistor Q4 starts to conduct after the first capacitor C1, so that the sixteenth resistor R16 and the twenty-second resistor R22 are connected in parallel to make the voltage of the first feedback circuit.
  • the resistance value becomes smaller, so that the voltage value collected by the twenty-second resistor R22 becomes smaller, further stopping the first feedback circuit, and after the second capacitor C2 is fully charged, the sixth NMOS transistor Q6 starts to conduct, so that the second The fifteen resistor R25 is connected in parallel with the twenty-seventh resistor R27 to make the resistance value of the voltage collected by the first feedback circuit smaller, so that the voltage value collected by the twenty-seventh resistor R27 becomes smaller, and the second feedback circuit feeds back to the power conversion circuit.
  • the voltage value becomes smaller, and the power conversion circuit adjusts the duty ratio again so that the output voltage value is the third voltage value V2b, that is, the first voltage and the second voltage value are the third voltage value V2b, and the third voltage value V2b is greater than The first voltage value Va and the second voltage value V2a.
  • the first control circuit When the user controls the load to enter the standby state or the second voltage value has a failure condition such as overvoltage or overcurrent, the first control circuit outputs a control signal to control the voltage switching circuit to stop working and sends a signal to the second control circuit, and from the second
  • the first end of the ten resistor R20 inputs a control signal
  • the output signal of the first control circuit is a low level signal
  • the fifth transistor Q5 is turned on
  • the first capacitor C1 is formed by a transistor Q5, a Zener Z1, and resistors R11 and R12.
  • the fast discharge circuit quickly discharges the energy stored in the first capacitor C1, and the second capacitor C2 can only discharge through the twenty-fourth resistor R24, so the fourth NMOS transistor Q4 is turned off before the sixth NMOS transistor Q6.
  • the sixteenth resistor R16 does not participate in the feedback of the system loop, while the twenty-fifth resistor R25 continues to participate in the feedback of the system loop, the second feedback circuit stops the feedback voltage, and the first feedback circuit acts as a feedback loop of the power supply, at this time the power conversion circuit The output voltage value becomes the first voltage value Va.
  • the power output device further includes:
  • the output end of the power conversion circuit 201 and the control end of the power conversion circuit 201 are connected, and the current value of the first path voltage outputted from the output end of the power conversion circuit 201 is higher than the first current preset.
  • the value outputs an overcurrent signal to the control terminal of the power conversion circuit 201, causing the power conversion circuit 201 to turn off the first overcurrent protection circuit 213 that outputs the first voltage;
  • the output end of the voltage switching circuit 201 is connected to the input end of the first control circuit 205, and is used when the output voltage of the output voltage of the voltage switching circuit 202 is higher than the voltage preset value.
  • the voltage signal drives the first control circuit 205 to control the voltage switching circuit 202 to turn off the second overvoltage protection circuit 208 that outputs the second voltage;
  • the output overcurrent signal drives the first control circuit 205 to control the voltage switching circuit 202 to turn off the second overcurrent protection circuit 209 that outputs the second path voltage;
  • the input end of the first overvoltage protection circuit 213 and the output end of the first control circuit 205 are connected to receive the control of the first control circuit 205 when the output terminal of the voltage switching circuit 202 outputs the second voltage
  • the signal turns off the first switching unit 214 of the first overvoltage protection circuit 212;
  • an output end of the first overcurrent protection circuit 213 and an output end of the first control circuit 205 configured to receive a control signal of the first control circuit 205 when the output end of the voltage switching circuit 202 outputs a second voltage Turning off the second switching unit 215 of the first overcurrent protection circuit 213;
  • the output end of the power conversion circuit 201 is connected to the input end of the first control circuit 205 for outputting the voltage value of the first path voltage when the voltage switching circuit 202 outputs the second circuit voltage.
  • the output overvoltage signal drives the first control circuit 205 to control the power conversion circuit 201 to turn off the output first channel voltage and the voltage switching circuit 202 to turn off the output second channel voltage when the voltage is higher than the preset value.
  • the output end of the power conversion circuit 201 is connected to the input end of the first control circuit 205, and is configured to output the first circuit voltage when the output end of the voltage switching circuit 202 outputs the second voltage.
  • the output overcurrent signal drives the first control circuit 205 to control the power conversion circuit 201 to turn off the output first voltage and the voltage switching circuit 202 to turn off the output second
  • the third overcurrent protection circuit 211 of the circuit voltage is higher than the third current preset value.
  • the power conversion circuit 201 when the load 100 is in standby, the power conversion circuit 201 outputs the first road voltage as the standby voltage of the load, and at this time, the power supply conversion circuit is passed through the first overvoltage protection circuit 212 and the first overcurrent protection circuit 213.
  • the standby voltage outputted by 201 performs overvoltage and overcurrent protection to prevent damage to the load 100 when the standby voltage is abnormal.
  • the standby voltage is overvoltage or overcurrent, and the first overvoltage protection circuit 212 or the first pass
  • the flow protection circuit 213 outputs a control signal to control the power conversion circuit 201 to stop operating.
  • the first control circuit 205 controls the voltage switching circuit 202 to output the second voltage, and the standby voltage terminal of the load 100 still has a standby voltage input due to The output of the second voltage causes the current flowing through the load standby voltage terminal to be higher than the current flowing through the standby voltage terminal when there is no second voltage output. Therefore, another protection circuit is needed to protect the standby voltage.
  • a control circuit 205 controls the first switching unit 214 and the second switching unit 215 to be disconnected, so that the first overvoltage protection circuit 212 and the first overcurrent
  • the protection circuit 213 stops working, and the standby voltage is over-voltage and over-current protected by the third over-voltage protection circuit 210 and the third over-current protection circuit 211, and is passed through the second over-voltage protection circuit 208 and the second over-current protection circuit 209.
  • the second voltage is overvoltage and overcurrent protection; when the load 100 is operating, when the second voltage is overvoltage or overcurrent, the second overvoltage protection circuit 208 and the second overcurrent protection circuit 209 are directed to the first control circuit.
  • the first control circuit 205 sends a control signal, the first control circuit 205 controls the voltage switching circuit to stop outputting the second circuit voltage, and when the standby voltage is overvoltage or overcurrent, the third overvoltage protection circuit 210 and the third overcurrent protection circuit 211 are first.
  • the control circuit 205 sends a control signal, and the first control circuit 205 outputs a control signal to control the power conversion circuit 201 to stop working.
  • the standby voltage is the same as the operating voltage at this time, when the standby voltage is overvoltage or overcurrent, the operating voltage is also overvoltage. Or overcurrent, therefore, when the third overvoltage protection circuit 210 and the third overcurrent protection circuit 211 send a control signal to the first control circuit to control the power conversion circuit 201 to stop working, System voltage switching circuit 202 stops the output voltage, to protect the load.
  • the output process of the power output device in this embodiment is described by taking only the first protection circuit, the second protection circuit, and the third protection circuit as an example. It can be understood that In an actual application, the protection of the output voltage when the output voltage of the power output device is implemented by using multiple protection circuits, such as the fourth protection circuit and the fifth protection circuit, may be used.
  • another embodiment of the power output device of the embodiment of the present invention further includes a first overcurrent detecting circuit 216 and a second overcurrent detecting circuit 217, and an input end of the first overcurrent detecting circuit 216 Connected to the output of the power conversion circuit 201, the input of the second overcurrent detection circuit 217 is connected to the output of the voltage switching circuit 202;
  • the first overvoltage protection circuit 212 includes:
  • the cathode of the first Zener diode ZD1 is an input end of the first overvoltage protection circuit 212, and is connected to the output end of the power conversion circuit 201, the anode of the first Zener diode ZD1 and the anode of the LED in the first photocoupler U1.
  • the cathode of the LED in the first photocoupler U1 is connected to the drain of the second NMOS transistor Q2, and the gate of the second NMOS transistor Q2 is the control end of the first overvoltage protection circuit 212, in the first optocoupler U1
  • the input end of the photoreceptor is the output end of the first overvoltage protection circuit 212, and the output end of the photodetector in the first photocoupler U1 and the source of the second NMOS transistor Q2 are connected to the same potential;
  • the first overcurrent protection circuit 213 includes:
  • a second photocoupler U2 a third NMOS transistor Q3, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, and a first operational amplifier UA1;
  • the anode of the light emitting diode in the second photocoupler U2 is connected to the output end of the power conversion circuit 201, the cathode of the light emitting diode in the second photocoupler U2 is connected to the drain of the third NMOS transistor Q3, and the gate of the third NMOS transistor Q3
  • the first end of the first resistor R1 is connected to the first output end of the first overcurrent protection circuit 213, and is connected to the first output end of the first overcurrent detection circuit 216.
  • the second end of the first resistor R1 is connected to the non-inverting input terminal of the first operational amplifier UA1 and the first end of the third resistor R3, the second end of the third resistor R3 is connected to the equipotential ground, and the first end of the second resistor R2 is The second input end of the first overcurrent protection circuit 213, the second end of the second resistor R2 is connected to the inverting input end of the first operational amplifier UA1, and the input end of the photoreceiver in the second photocoupler U2 is An output end of the overcurrent protection circuit 213 is connected to the second output end of the first overcurrent detecting circuit, and the output end of the photodetector in the second photocoupler U2 is connected to the source of the third NMOS transistor Q3. , the anode of the diode D1 and the output of the first operational amplifier UA1 Connected to the end, the cathode of the diode D1 is the control end of the first overcurrent protection circuit 213;
  • the second overvoltage protection circuit 208 includes:
  • the first end of the fourth resistor R4 is an input end of the second overvoltage protection circuit 208, and the second end of the fourth resistor R4 is connected to the first end of the sixth resistor R6 and the non-inverting input end of the second operational amplifier UA2.
  • the second end of the sixth resistor R6 is connected to the equal potential
  • the first end of the fifth resistor R5 is connected to the reference voltage Vref
  • the second end of the fifth resistor R5 is connected to the inverting input end of the second operational amplifier UA2
  • the output end of the UA2 is the output end of the second overvoltage protection circuit 208;
  • the second overcurrent protection circuit 209 includes:
  • the first end of the seventh resistor R7 is a first input end of the second overcurrent protection circuit 209, and is connected to the first output end of the second overcurrent detecting circuit 217, and the second end and the ninth resistor of the seventh resistor R7
  • the first end of R9 is connected to the non-inverting input terminal of the third operational amplifier UA3, the second end of the ninth resistor R9 is connected to the equal potential, and the first end of the eighth resistor R8 is the second of the second overcurrent protection circuit 209.
  • the input end is connected to the second output end of the second overcurrent detecting circuit 217, the second end of the eighth resistor R8 is connected to the inverting input end of the third operational amplifier UA3, and the output end of the third operational amplifier UA3 is An output of the second overcurrent protection circuit 209;
  • the third overvoltage protection circuit 210 includes:
  • a tenth resistor R10 an eleventh resistor R11, a twelfth resistor R12, and a fourth operational amplifier UA4;
  • the first end of the tenth resistor R10 is an input end of the third overvoltage protection circuit 210, and the second end of the tenth resistor R10 is connected to the first end of the twelfth resistor R12 and the non-inverting input terminal of the fourth operational amplifier UA4
  • the second end of the twelfth resistor R12 is connected to the equal potential.
  • the first end of the eleventh resistor R11 is connected to the reference voltage Vref, and the second end of the eleventh resistor R11 is connected to the inverting input terminal of the fourth operational amplifier UA4.
  • the output end of the fourth operational amplifier UA4 is the output end of the third overvoltage protection circuit 210;
  • the third overcurrent protection circuit 211 includes:
  • the first end of the thirteenth resistor R13 is a first input end of the third overcurrent protection circuit 211, and is connected to the first output end of the first overcurrent detecting circuit 216, and the second end of the thirteenth resistor R13 is The first end of the fifteen resistor R15 is connected to the non-inverting input terminal of the fifth operational amplifier UA5, the second end of the fifteenth resistor R15 is connected to the equal potential, and the first end of the fourteenth resistor R14 is the third overcurrent protection.
  • a second input end of the circuit 211 is connected to the second output end of the first overcurrent detecting circuit 216, and a second end of the fourteenth resistor R14 is connected to the inverting input end of the fifth operational amplifier UA5, and the fifth operational amplifier
  • the output of the UA5 is the output of the third overcurrent protection circuit 211.
  • the operational amplifier in the above circuit may be replaced by a comparator, and the first overcurrent detecting circuit and the second overcurrent detecting circuit may be resistors or inductors, etc., which are not limited herein.
  • the control signal output end of the load 100 When the load 100 is in standby, the control signal output end of the load 100 outputs a standby control signal to the first control circuit 205, and the first control circuit 205 outputs a high level (in the embodiment of the present invention, the voltage switching circuit is set to be active low)
  • the first control circuit 205 When the gate of the first NMOS transistor Q1 is turned on, the first NMOS transistor Q1 is turned off, the standby voltage outputted by the power conversion circuit 201 cannot be switched to the operating voltage of the load 100, the load 100 is maintained in the standby state, and the first overvoltage protection circuit 212 receives The high level outputted by the first control circuit turns on the second NMOS transistor Q2.
  • the overvoltage signal is transmitted to the power conversion circuit 201 through the input end of the photodetector in the first photocoupler U1.
  • a switching control terminal stops the power conversion circuit 201.
  • the working principle of the first overcurrent protection circuit 213 is similar to that of the first overvoltage protection circuit 212.
  • the first current detecting circuit such as a resistor, is compared by the first operational amplifier UA1.
  • the voltage across the inductor when the current value of the first voltage outputted by the output end of the power conversion circuit 201 is higher than the first current preset value, through the second photoelectric coupling
  • the input end of the photoreceiver of U2 transmits the overcurrent signal to the control end of the power conversion circuit 201, so that the power conversion circuit 201 stops working, and the first feedback circuit 203 feeds back the magnitude of the standby voltage output by the power conversion circuit 201 in real time, and drives the power conversion.
  • the circuit 201 automatically adjusts the magnitude of the output voltage
  • the third overvoltage protection circuit 210 overvoltages the overvoltage protection, when the standby voltage is overvoltage, That is, when the standby voltage VS is greater than the reference voltage Vref, the third overvoltage protection circuit 210 outputs an overvoltage signal to the first control circuit 205, and the first control circuit 205 outputs a high level signal (overvoltage signal) to make the first overvoltage.
  • the protection circuit 206 operates (the first control circuit 205 outputs a low level when the standby voltage is normal, the first overvoltage protection circuit and the first overcurrent protection circuit cannot be turned on), thereby controlling the power conversion circuit 201 to stop working, and at the same time, A control circuit 205 outputs a high level to cause the voltage switching circuit 202 to stop outputting the second circuit voltage; when the standby voltage is overcurrent, the third overcurrent protection circuit 211 outputs an overcurrent signal to the first control circuit 205, and the first control circuit 205 Outputting a high level signal (overcurrent signal) to the first overcurrent protection circuit 213, and then the first overcurrent protection circuit 213 controls the power conversion circuit 201 to stop working, and at the same time, the first control The circuit 205 outputs a high level to cause the voltage switching circuit 202 to stop outputting the second circuit voltage; when the second circuit voltage, that is, the operating voltage is overvoltage, the second overvoltage protection circuit 208 outputs an overvoltage signal to the first control circuit 205, first The control circuit
  • the standby voltage and the operating voltage are output by the power conversion circuit 201.
  • the first control circuit When the standby voltage and the operating voltage are both normal, the first control circuit outputs a low level, the first overvoltage protection circuit 206 and the first The overcurrent protection circuit 207 is turned off (not working).
  • the first circuit voltage when the second voltage is not output, the first circuit voltage is output as the standby voltage of the system.
  • the system load current is small, the first circuit voltage has overcurrent and overvoltage protection; and the second voltage has When outputting, due to the increase of system load current, the first voltage must have overcurrent and overvoltage protection. It is necessary to replace another protection system to protect the first voltage.
  • the second voltage must have overcurrent and overvoltage protection. When the second voltage occurs overcurrent and overvoltage, the protection circuit works, the second voltage has no output, and the first voltage is always present as the standby voltage of the system.
  • an embodiment of the present invention further provides a power output device control method, where the power output device includes a power conversion circuit and a voltage switching circuit, and the power output device further includes at least a first feedback circuit and a second feedback.
  • the input end of the power conversion circuit is connected to an alternating current power source, and the alternating current power is converted into direct current output from the output end thereof, and the output end of the power conversion circuit is connected as a first path voltage to the load, and the output of the power conversion circuit is The end is connected to the input end of the voltage switching circuit, the output end of the voltage switching circuit is connected to the load as a second voltage, and the first feedback circuit is configured to sample the first circuit voltage and feed back to the power conversion circuit
  • the second feedback circuit is configured to sample the second voltage and feed back to the power conversion circuit, and the method includes:
  • the first control circuit issues a voltage output control signal or a voltage output interrupt control signal according to the load state to control the voltage switching circuit to output the second path voltage or stop outputting the second path voltage, and send the voltage output control signal or the voltage output to the second control circuit.
  • Interrupt control signal ;
  • the first control circuit may be a logic circuit, a microprocessor (MCU) or other forms of integrated circuits, such as: a specific application integrated circuit (Application) Specific Integrated Circuit (ASIC) or Field Programmable Gate Array (FieldProgrammable Gate) Array, FPGA), etc.
  • MCU microprocessor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • the first control circuit controls the voltage switching circuit to output the second path voltage and the first feedback circuit disables the first feedback circuit according to the voltage output control signal when the first feedback circuit is disabled according to the collected voltage value
  • the first feedback circuit maintains a disabled state
  • the second control circuit adjusts the voltage collected by the first feedback circuit according to the voltage output interrupt control signal to disable the second feedback circuit and
  • the first feedback circuit provides a feedback signal.
  • step 302 are specifically as follows:
  • the first feedback circuit and the second feedback circuit set the acquisition resistor to disable the first feedback circuit according to the collected voltage value, and the second feedback circuit is The power conversion circuit provides a feedback signal
  • the power conversion circuit compares the voltage value fed back by the second feedback circuit with the reference voltage to adjust the output so that the first path voltage and the second path voltage are the second voltage value V2a, and the second voltage value is smaller than the power source
  • the second control circuit keeps the first feedback circuit in a disabled state by adjusting a voltage value collected by the first feedback circuit according to the voltage output control signal;
  • the second control circuit reduces the voltage collected by the first feedback circuit by paralleling the resistance across the collecting resistor of the first feedback circuit, so that the first feedback circuit maintains the disabled state.
  • the second control circuit reduces the voltage collected by the second feedback circuit by paralleling the resistance across the collecting resistor of the second feeding circuit, and the voltage value fed back by the second feedback circuit to the power conversion circuit becomes smaller.
  • the power conversion circuit compares the voltage value fed back by the second feedback circuit with the reference voltage to adjust the output so that the first path voltage and the second path voltage are the third voltage value V2b, and the third voltage value V2b is greater than the The first voltage value Va and the second voltage value V2a.
  • the output voltage switching waveform diagram of the power output device of the present invention is obtained. After the first control circuit controls the output of the second voltage, the voltage value output by the power output device first decreases and then rises.
  • step 303 is specifically:
  • the second control circuit adjusts the voltage collected by the first feedback circuit according to the voltage output interrupt control signal to disable the second feedback circuit
  • the second control circuit causes the first feedback circuit to provide a feedback signal to the power conversion circuit by adjusting the voltage collected by the first feedback circuit, and by setting a circuit structure of the second control circuit, the second control circuit passes the first pre- The first feedback circuit is adjusted to provide a feedback signal to the power conversion circuit after a set time.
  • the second control circuit adjusts a voltage value collected by the second feedback circuit, and the second control circuit adjusts a voltage value collected by the second feedback circuit after a second preset time, wherein the first preset The time is shorter than the second preset time;
  • the power conversion circuit compares the voltage value fed back by the first feedback circuit with the reference voltage to adjust the output so that the first path voltage is the first voltage value Va.
  • the embodiment of the present invention further provides another embodiment of a method for controlling a power output device.
  • the power device further includes at least: a first overvoltage protection circuit, a first overcurrent protection circuit, a second overvoltage protection circuit, and a second An overcurrent protection circuit, a third overvoltage protection circuit and a third overcurrent protection circuit, wherein the input ends of the first overvoltage protection circuit and the first overcurrent protection circuit are connected to an output end of the power conversion circuit, and the output end Connected to the control end of the power conversion circuit, the input ends of the second overvoltage protection circuit and the second overcurrent protection circuit are connected to the output end of the voltage switching circuit, and the output end is connected to the first control circuit
  • the input ends are connected, the input ends of the third overvoltage protection circuit and the third overcurrent protection circuit are connected to the output end of the power conversion circuit, and the output end is connected to the input end of the first control circuit
  • the method include:
  • the second overvoltage protection circuit drives the first control circuit to control the voltage switching when a voltage value of a second circuit voltage outputted by an output terminal of the voltage switching circuit is higher than a voltage preset value
  • the circuit turns off the output of the second voltage
  • the second overcurrent protection circuit drives the first control circuit to control the voltage switching circuit when the current value of the output voltage of the output voltage of the voltage switching circuit is higher than the second current preset value Break the output of the second voltage.
  • the power conversion circuit When the voltage switching circuit outputs the second voltage, the power conversion circuit outputs a voltage value of the first circuit voltage higher than a voltage preset value, and controls the third overvoltage protection circuit to turn off the output first voltage and the second a circuit voltage, when the voltage switching circuit outputs a second circuit voltage, when the current value of the first circuit voltage outputted by the power conversion circuit is higher than a third current preset value, controlling the third overcurrent protection circuit to turn off the output first Road voltage and second circuit voltage;
  • the third overvoltage protection circuit drives the overvoltage signal when the output voltage of the first circuit voltage is higher than the voltage preset value when the output of the voltage switching circuit outputs the second voltage
  • the first control circuit controls the power conversion circuit to turn off the output of the first way voltage and the voltage switching circuit to turn off the output of the second way voltage
  • the third overcurrent protection circuit drives the first control when the voltage conversion circuit outputs the second way voltage when the current conversion circuit outputs a current value of the first path voltage that is higher than the third current preset value.
  • the circuit controls the power conversion circuit to turn off the output first voltage and the voltage switching circuit to turn off the output second voltage.
  • the first overvoltage protection circuit outputs an overvoltage signal to the control end of the power conversion circuit when the voltage value of the first path voltage outputted by the output end of the power conversion circuit is higher than the voltage preset value.
  • the power conversion circuit turns off the output of the first way voltage
  • the first overcurrent protection circuit is configured to output an overcurrent signal to a control end of the power conversion circuit when a current value of a first path voltage outputted by an output end of the power conversion circuit is higher than a first current preset value And causing the power conversion circuit to turn off the output of the first way voltage.
  • the first control circuit converts the standby voltage outputted by the power conversion circuit to the working voltage of the load according to the control signal outputted by the control when the load is in different working states, so that the load is in standby and normal.
  • the operation makes only one power conversion circuit required, and the power control circuit provided by the invention has a simple structure and reduces power loss.

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Abstract

一种电源输出装置及电源输出装置控制方法。第一控制电路（205）根据负载（100）在不同工作状态时输出的控制信号对应控制电压切换电路（202）是否将电源转换电路（201）输出的待机电压转换为负载的工作电压，使负载在待机和正常工作时只需要一个电源转换电路，电源控制电路结构简单，且减少了电能损耗，同时提高了整个装置的可靠性。

Description

一种电源输出装置及电源输出装置控制方法 技术领域
本发明属于电源控制领域，尤其涉及一种电源输出装置及电源输出装置控制方法。
背景技术
终端负载或系统的功能需求千变万化，对供电电源的要求也多样化，现有的供电电源的技术方案主要以下两种：
第一种技术方案中，在交流输入电压正常时，待机电压输出正常后，终端或系统会发出信号给到控制电路，控制电路输出信号控制工作电压开始输出，但此时待机电压仍正常工作，作为终端或系统其中的一个供电电源。
第二种技术方案中，在交流输入电压正常时，待机电压输出正常后，终端或系统会发出信号给到控制电路，控制电路输出信号控制工作电压开始输出，当工作电压输出正常后，控制电源发出控制信号控制第一切换电路关闭使待机电源无输出，并控制第二切换电路开通，此时待机电压的能量由工作电压获取，但是待机电源仍然正常工作。
在以上两种方案中，待机电压和工作电压是由两个电源转换分别控制输出，需要两个电源和两个控制电路，在对电源待机功耗要求越来越低、成本要求越来越苛刻、功率密度要求越来越高的情况下，此两种解决方案在产品的成本、体积以及可靠性上都带来很大的挑战。因此，需要设计一个既能满足现有终端或系统需求，又能满足高功率密度的要求的电源方案。
 技术问题
本发明提供了一种电源输出装置及电源输出装置控制方法，旨在解决现有终端负载或系统中需要两个电源和两个电源控制电路，电路设计复杂且功耗较高的问题。
技术解决方案
为了解决上述技术问题，本发明是这样实现的：
一种电源输出装置，包括：
电源转换电路、电压切换电路、第一控制电路、第二控制电路以及反馈电路，所述反馈电路至少包括第一反馈电路和第二反馈电路；
所述电源转换电路输入端与交流电源连接，将交流电转换为直流电从其输出端输出，所述电源转换电路的输出端作为第一路电压连接至负载，并且所述电源转换电路的输出端连接至所述电压切换电路的输入端，所述电压切换电路的输出端作为第二路电压连接至负载；
所述第一反馈电路的输入端与所述电源转换电路的输出端连接，用于采集所述电源转换电路的输出端输出的第一路电压并反馈给所述电源转换电路；
所述第一控制电路的输出端与所述电压切换电路的控制端连接，用于发出电压输出控制信号或电压输出中断控制信号以控制所述电压切换电路输出第二路电压或停止输出第二路电压，并向所述第二控制电路发送所述电压输出控制信号或所述电压输出中断控制信号；
所述第二反馈电路的输入端与所述电压切换电路的输出端连接，用于采集所述电压切换电路的输出端输出的第二路电压并反馈给所述电源转换电路；
所述第二控制电路的输入端与所述第一控制电路的输出端连接，所述第二控制电路的输出端与所述第一反馈电路的控制端和所述第二反馈电路的控制端连接，所述第二控制电路用于在第一控制电路控制输出第二路电压以及所述第一反馈电路根据采集电压值除能时根据所述电压输出控制信号调整所述第一反馈电路使所述第一反馈电路保持除能状态；
所述第二控制电路还用于根据所述电压输出中断控制信号调整所述第一反馈电路采集的电压使第二反馈电路除能并使所述第一反馈电路提供反馈信号。
本发明还提供了一种电源输出装置控制方法，所述电源输出装置包括电源转换电路、电压切换电路，所述电源输出装置还至少包括第一反馈电路和第二反馈电路，所述电源转换电路输入端与交流电源连接，将交流电转换为直流电从其输出端输出，所述电源转换电路的输出端作为第一路电压连接至负载，并且所述电源转换电路的输出端连接至所述电压切换电路的输入端，所述电压切换电路的输出端作为第二路电压连接至负载，所述第一反馈电路用于采样第一路电压并反馈给所述电源转换电路，所述第二反馈电路用于采样第二路电压并反馈给所述电源转换电路，所述方法包括：
根据负载状态控制所述电压切换电路输出第二路电压或停止输出第二路电压；
当所述电压切换电路输出第二路电压以及所述第一反馈电路根据采集电压值除能时调整所述第一反馈电路使所述第一反馈电路保持除能状态；
当所述电压切换电路停止输出第二路电压时调整所述第一反馈电路采集的电压使第二反馈电路除能并使所述第一反馈电路提供反馈信号。
 有益效果
在本发明中，第一控制电路根据负载在不同的工作状态时输出的控制信号对应控制电压切换电路是否将电源转换电路输出的待机电压转换为负载的工作电压，使负载在待机和正常工作使只需要一个电源转换电路，本发明提供的电源控制电路结构简单，且减少了电能损耗。
附图说明
图1是本发明实施例提供的电源输出装置的实施例示意图；
图2是本发明实施例提供的电源输出装置中的另一实施例示意图；
图3是本发明实施例提供的电源输出装置中的电压切换电路的电路结构图；
图4是本发明实施例提供的电源输出装置中的第二控制电路和第一反馈电路的电路结构图；
图5是本发明实施例提供的电源输出装置中的第二控制电路和第二反馈电路的电路结构图；
图6是本发明实施例提供的电源输出装置的另一实施例示意图；
图7是本发明实施例提供的电源输出装置的另一实施例示意图；
图8是本发明实施例提供的电源输出装置控制方法的一实施例示意图；
图9是本发明实施例提供的电源输出装置控制方法的另一实施例示意图；
图10是本发明实施例提供的电源输出装置控制方法的另一实施例示意图；
图11是为本发明实施例提供的电源输出装置控制方法中输出电压切换波形图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
以下结合具体实施例对本发明的具体实现进行详细描述：
图1示出了本发明实施例提供的电源控制电路的电路结构，为了便于说明，仅列出与本发明实施例相关的部分，详述如下：
作为本发明实施例提供一种电源输出装置的一个实施例，包括：
一种电源输出装置，包括：
电源转换电路201、电压切换电路202、第一控制电路205以及第二控制电路206；所述电源输出装置还至少包括第一反馈电路203和第二反馈电路204；
所述电源转换电路201输入端与交流电源连接，将交流电转换为直流电VS从其输出端输出，所述电源转换电路201的输出端作为第一路电压连接至负载100，并且所述电源转换电路201的输出端连接至所述电压切换电路202的输入端，所述电压切换电路202的输出端作为第二路电压V2连接至负载100；
所述第一反馈电路203的输入端与所述电源转换电路201的输出端连接，用于采集所述电源转换电路201的输出端输出的第一路电压并反馈给所述电源转换电路201；
所述第一控制电路205的输出端与所述电压切换电路202的控制端连接，用于发出电压输出控制信号或电压输出中断控制信号以控制所述电压切换电路202输出第二路电压或停止输出第二路电压，并向所述第二控制电路202发送电压输出控制信号或电压输出中断控制信号；
所述第二反馈电路204的输入端与所述电压切换电路202的输出端连接，用于采集所述电压切换电路202的输出端输出的第二路电压并反馈给所述电源转换电路201；
所述第二控制电路206的输入端与所述第一控制电路205的输出端连接，所述第二控制电路206的输出端与所述第一反馈电路203的控制端和所述第二反馈电路204的控制端连接，所述第二控制电路204用于在第一控制电路205控制输出第二路电压以及所述第一反馈电路203根据采集电压值除能时根据所述电压输出控制信号调整所述第一反馈电路203使所述第一反馈电路203保持除能状态；所述第二控制电路206还用于根据所述电压输出中断控制信号调整所述第一反馈电路203采集的电压使第二反馈电路204除能并使所述第一反馈电路提供反馈信号。
所述电源转换电路201的输入端与交流电AC连接，输出端与负载100连接，所述负载100与第一控制电路205连接，所述第一控制电路205在负载100待机状态和正常工作状态时控制点与输出装置分别输出待机电压和工作电压，所述第一路电压为待机电压，所述第二路电压为工作电压。
在本发明实施例中，负载为设置于包括但不限于计算机、电视等设备内的主板控制器，负载包括待机和正常工作两种工作状态，所述电源输出装置输出的待机电压和工作电压可以相同也可以不相同，例如可以在电压输出装置输出端再串联一个直流直流电源转换器可以使所述电源输出装置输出多路不同的电压值，具体此处不做限定。供电电源与负载的工作过程为：供电电源上电时输出待机电压给负载中的待机电路，同时负载输出待机控制信号，待机电路工作稳定后负载输出工作控制信号，供电电源接收到所述工作控制信号输出工作电压，负载进入开机状态。当负载进入待机状态时，负载输出待机控制信号给第一控制电路，第一控制电路输出控制信号控制电压切换电路停止工作并发送信号给第二控制电路，则电压切换电路不能将电源转换电路输出的电压转换为负载的工作电压，只有待机电压输入给负载，第二反馈电路除能，所述第一反馈电路提供反馈信号，即第二反馈电路停止工作并切换为第一反馈电路工作，当负载工作时，负载输出工作控制信号给第一控制电路，第一控制电路控制电压切换电路进行工作并发送信号给第二控制电路，将电源转换电路输出的待机电压转换为负载的工作电压进行输出，第一控制电路控制输出第二路电压，所述第一反馈电路根据采集的电压值除能，第二控制电路根据所述电压输出控制信号调整所述第一反馈电路使所述第一反馈电路保持除能状态，此时，所述第二反馈电路提供反馈信号，即使第一反馈电路停止工作并切换为第二反馈电路工作。
具体的，所述第一反馈电路203包括：采集第一路电压的第一电压采集电路2031；
与所述第一电压采集电路2031连接，用于将所述第一电压采集电路2031采集的电压值进行调整后输出的第一误差放大器2032；
与所述第一误差放大器2032连接，用于根据所述第一误差放大器2032输出的电压信号向所述电源转换电路201输出的第一电压输出电路2033；
所述第二反馈电路204包括：采集第二路电压的第二电压采集电路2041；
与所述第二电压采集电路2041连接，用于将所述第二电压采集电路2041采集的电压值与进行调整后输出的第二误差放大器2042；
与所述第二误差放大器2042连接，用于根据所述第二误差放大器2042输出的电压信号向电源转换电路输出的第二电压输出电路2043；
所述第二控制电路206与所述第一电压采集电路2031连接和所述第二电压采集电路2041连接，用于通过控制所述第一电压采集电路2031和所述第二电压采集电路2041以调整所述第一反馈电路和第二反馈电路的反馈状态；
所述第一次采集电路2031可以采用分压电阻对第一路电压进行采集；第一误差放大器2032将所述第一电压采集电路2031采集的电压值进行调整后输出，第一电压输出电路2033可以采用光电耦合器等电压发送装置，根据所述第一误差放大器2032输出的电压信号向所述电源转换电路201输出电压，所述第二控制电路206可以通过调整第一次采集电路2031的分压电阻阻值来调整所述第一电压采集电路2031采集的电压值，以控制所述第一反馈电路203的反馈状态。
所述第二次采集电路2041可以采用分压电阻对第二路电压进行采集；第二误差放大器2042将所述第二电压采集电路2041采集的电压值进行调整后输出，第二电压输出电路2043可以采用光电耦合器等电压发送装置，根据所述第二误差放大器输出的电压信号向所述电源转换电路201输出电压，所述第二控制电路206可以通过调整第二次采集电路2041的分压电阻阻值来调整所述第二电压采集电路2041采集的电压值，以控制所述第二反馈电路204的反馈状态。
下面具体介绍本实施例的工作过程，当没有负载接入时，电源转换电路202输出第一路电压，此时第一反馈电路203进行工作，电源转换电路202输出第一路电压为第一电压值，当用户控制负载工作时，负载输出工作控制信号给第一控制电路205，第一控制电路205控制电压切换电路202进行工作输出第二路电压并发送电压输出信号给第二控制电路206，所述第一控制电路205控制输出第二路电压，第二反馈电路204开始采集第二路电压并反馈给电源转换电路201，通过设置第一电压采集电路2031和第二电压采集电路2041的采集电阻值，将所述第一反馈电路203采集的电压值变小使第一误差放大器输出控制信号使第一反馈电路停止反馈，即所述第一反馈电路203根据采集的电压值除能，第二反馈电路开始工作，第二反馈电路204反馈给电源转换电路201的电压值高于第一反馈电路203停止反馈前反馈给电源转换电路201的电压值，电源转换电路201通过设置在内部的电压比较器将接收的第二反馈电路204发送的电压值与参考电压进行比较以调整输出电压占空比输出电压，此时，由于第二反馈电路204发送的电压值大于第一反馈电路203停止反馈前反馈的电压值，电源转换电路201调整占空比使输出电压为第二电压值，则第一路电压和第二路电压输出为第二电压值，所述第二电压值小于第一电压值，由于第二电压值变小使第一采集电路2031采集的电压值变小，进一步使第一误差放大器2032输出控制信号停止第一电压输送电路2033反馈电压，所述第一反馈电路203继续停止工作，同时第二控制电路206通过在第一电压采集电路2031的采集电阻两端并联一个电阻调整第一电压采集电路2031采集的电压值，使第一电压采集电路2031采集的电压值变的更小，进一步使第一反馈电路203停止工作，同时通过在第二电压采集电路2041的采集电阻两端并联一个电阻调整第二电压采集电路2041采集的电压值，使第二电压采集电路2041采集的电压值变小，此时，由于第二电压采集电路2041通过第二电压输送电路2043反馈给电源转换电路201的电压值变小，电源转换电路201再次调整占空比使输出电压值为第三电压值，即第一路电压和第二路电压值为第三电压值，此时第三电压值大于第一电压值和第二电压值。
当用户控制负载进入待机状态或者第二路电压值出现过压或过流等失效情况时，第一控制电路205输出控制信号控制电压切换电路202停止工作并发送电压输出中断控制信号给第二控制电路206，所述第一控制电路205通过输出电压输出中断控制信号调整所述第一反馈电路203采集的电压将第二反馈电路204除能，所述第二控制电路206根据电压输出中断控制信号控制进行时间调整，控制对第一电压采样电路2031进行电压调整的时间点先于第二电压采样电路2041进行电压调整的时间点，使并联在第一电压采集电路2031的采集电阻两端的电阻先断开使第二反馈电路204除能，此时第二路输出电压仍然存在，但尚未对第二电压采集电路2041进行调整，第一反馈电路203提供给电源转换电路201的电压升高，使电源转换电路201调整输出电压占空比，使输出的电压值降低，输出的电压值恢复为第一电压值，此时，第二控制电路205开始对第二电压采样电路2041进行电压调整，使并联在第二电压采集电路2041的采集电阻两端的电阻断开，第二控制电路205停止参与第二反馈电路的回路反馈。
本实施例实现了当第二路电压无输出时，第二反馈电路停止工作，第一反馈电路工作；当第二路电压有输出时，第一反馈电路停止工作，第二反馈电路工作，在第二路电压发生过流和过压的失效时，反馈电路要从第二反馈电路切换到第一反馈电路，在切换的过程中，第一控制电路发出电压输出中断控制信号调整所述第一反馈电路采集的电压使第二反馈电路除能，但此时第二路电压仍然存在输出，第二控制电路调整所述第一反馈电路采集的电压的同时调整第一反馈电路的反馈电压实现反馈并输出第一路电压，实现了在第一反馈电路和第二反馈电路的相互切换过程中第一路电压和第二路电压的平滑过渡。
需要说明的是，本实施例中，上述仅以反馈电路包括第一反馈电路和第二反馈电路为例对本实施例中的电源输出装置的输出过程进行了描述，可以理解的是，在实际应用中，还可以采用其他的方式例如反馈电路还包括第三反馈电路和第四反馈电路实现电源输出装置的输出过程，具体此处不作限定。
如图3所示，作为本发明实施例电源输出装置中电压切换电路的一实施例，所述电压切换电路202为第一NMOS管Q1；
第一NMOS管的漏极为电压切换电路202的电源端，所述电源端与所属电源转换电路201的输出端连接，第一NMOS管Q1的源极为电压切换电路202的输出端，所述输出端与负载连接，第一NMOS管Q1的栅极为电压切换电路202的控制端，所述控制端与第一控制电路205连接。
如图4所示，作为本发明电源输出装置中的一个实施例，第二控制电路206包括：第十六电阻R16、第十七电阻R17、第十八电阻R18、第十九电阻R19、第二十电阻R20、第一电容C1、第二稳压管ZD1、第四NMOS管Q4以及PNP型三极管Q5；
第二十电阻R20的第一端为第二控制电路206的输入端，连接第一控制电路205的输出端，第二十电阻R20的第二端与PNP型三极管Q5的基极、第二稳压管ZD2的阴极以及第十九电阻R19的第一端连接，第十八电阻R18的第一端与电压切换电路202的输出端连接用于接收所述电压切换电路202输出的第二路电压V2，第十八电阻R18的第二端与PNP型三极管Q5的发射极、第十七电阻R17的第一端、第一电容C1的第一端以及第四NMOS管Q4的栅极连接，PNP型三极管Q5的集电极与第十九电阻R19的第二端、第二稳压管ZD2的阳极、第十七电阻R17的第二端、第一电容C1的第二端以及第四NMOS管Q4的源极共接于等电势地，第四NMOS管Q4的漏极与第十六电阻R16的第一端连接，第十六电阻R16的第二端为第二控制电路206的第一控制输出端；
第一反馈电路203中所述第一电压采集电路2031包括：第二十一电阻R21和第二十二电阻R22；所述第一电压输出电路2033为第三光电耦合器U3；
第二十一电阻R21的第一端为第一反馈电路203的输入端用于接收电源转换电路输出的第一路电压VS，第二十一电阻R21的第二端与第二十二电阻R22的第一端以及第一误差放大器BD1的第一端连接，第二十二电阻R22的第二端接等电势地，第二十一电阻R21与第二十二电阻R22的公共连接端为第一反馈电路203的控制端，第三光电耦合器U3中发光二极管的阳极与电源转换电路201的输出端连接，第三光电耦合器U3中发光二极管的阴极与第一误差放大器BD1的第三端连接，第一误差放大器BD1的第二端接等电势地，第三光电耦合器U3中受光器的输入端为第一反馈电路203的输出端，用于连接所述电源转换电路201，第三光电耦合器U3中受光器的输出端接等电势地。
如图5所示，作为本发明电源输出装置中的一实施例，第二控制电路206包括：第二十五电阻R25、第六NMOS管Q6、第二十三电阻R23、第二十四电阻R24以及第二电容C2；
第二十三电阻R23的第一端与电压切换电路202的输出端连接，用于接收所述电压切换电路202输出的第二路电压V2，第二十三电阻R23的第二端与第六NMOS管Q6的栅极、第二电容C2的第一端以及第二十四电阻R24的第一端连接，第六NMOS管Q6的源极与第二电容C2的第二端以及第二十四电阻R24的第二端共接于等电势地，第六NMOS管Q6的漏极与第二十五电阻R25的第一端连接，第二十五电阻R25的第二端为第二控制电路206的第二控制输出端；
第二反馈电路204中所述第二电压采集电路2041包括：第二十六电阻R26和第二十七电阻R27；所述第二电压输出电路2043为第四光电耦合器U4；
第二十六电阻R26的第一端为第二反馈电路204的输入端，用于接收所述电压切换电路202输出的第二路电压V2，第二十六电阻R26的第二端与第二十七电阻R27的第一端以及第二误差放大器BD2的第一端连接，第二十七电阻R27的第二端接等电势地，第二十六电阻R26与第二十七电阻R27的公共连接端为第二反馈电路214的控制端，第四光电耦合器U4中发光二极管的阳极与电压切换电路202的输出端连接，第四光电耦合器U4中发光二极管的阴极与第二误差放大器BD2的第三端连接，第二误差放大器BD2的第二端接等电势地，第四光电耦合器U4中受光器的输入端为第二反馈电路204的输出端，用于连接所述电源转换电路201，第四光电耦合器U4中受光器的输出端接等电势地。
下面对本发明实施例提供的电源控制电路的工作原理进行说明：
第二控制电路中，第十六电阻R16和第二十五电阻R25用于第一反馈电路和第二反馈电路采集电压值的控制，第一电容C1在充电充满时控制第四NMOS管Q4导通，并在第五三极管Q5导通时与第五三极管Q5，稳压管Z1以及第十九电阻R19和第二十电阻R20构成快速放电控制电路，第二电容C2在充电充满时控制第六NMOS管Q6导通，并与第二十四电阻R24形成放电回路。
当第二路电压无输出时，仅第一反馈电路工作，此时第一路电压的电压值为第一电压值Va。
当第一控制电路控制电压切换电路输出第二路电压时，首先通过第十八电阻R18和通过第二十三电阻R23第一端输入第二路电压V2，对第一电容C1和第二电容C2进行充电，此时第四NMOS管Q4和第六NMOS管Q6 没有导通，第二十六电阻R26和第二十七电阻R27对第二路电压进行分压并将采集电压输送给电源转换电路，通过设置第二十一电阻R21、第二十二电阻R22、第二十六电阻R26和第二十七电阻R27的阻值，使第二十七电阻R27采集的电压值高于第二十二电阻R22采集的电压值，根据第二十二电阻R22采集的电压值使第一误差放大器BD1输出电压控制信号使第一反馈电路停止反馈，电源转换电路通过设置在内部的电压比较器将接收的第二十七电阻R27采集的电压值与参考电压进行比较以调整输出电压占空比输出电压，电源转换电路调整占空比使输出电压为第二电压值V2a，即此时第一路电压和第二路电压输出为第二电压值V2a，所述第二电压值V2a小于第一电压值Va，由于电源转换电路的输出电压变低，使第二十二电阻R22采集的电压值进一步降低使第一误差放大器BD1继续输出电压控制信号使第一反馈电路停止反馈，此时，第一电容C1后第四NMOS管Q4开始导通，导致第十六电阻R16与第二十二电阻R22并联使第一反馈电路采集电压的电阻阻值变小，使第二十二电阻R22采集的电压值变的更小，进一步使第一反馈电路停止工作，第二电容C2充满电后第六NMOS管Q6开始导通，使第二十五电阻R25与第二十七电阻R27并联使第一反馈电路采集电压的电阻阻值变小，使第二十七电阻R27采集的电压值变小，第二反馈电路反馈给电源转换电路的电压值变小，电源转换电路再次调整占空比使输出电压值为第三电压值V2b，即第一路电压和第二路电压值为第三电压值V2b，此时第三电压值V2b大于第一电压值Va和第二电压值V2a。
当用户控制负载进入待机状态或者第二路电压值出现过压或过流等失效情况时，第一控制电路输出控制信号控制电压切换电路停止工作并发送信号给第二控制电路，并从第二十电阻R20的第一端输入控制信号，第一控制电路输出信号为低电平信号，第五三极管Q5导通，第一电容C1通过三极管Q5，稳压管Z1以及电阻R11和R12构成快速放电电路快速把第一电容C1储存的能量放完，而第二电容C2只能通过第二十四电阻R24进行放电，因此第四NMOS管Q4先于第六NMOS管Q6关闭，此时，第十六电阻R16不参与系统回路的反馈，而第二十五电阻R25继续参与系统回路的反馈，第二反馈电路停止反馈电压，第一反馈电路作为电源的反馈回路，此时电源转换电路的输出电压值变为第一电压值Va。
如图6所示，作为本发明实施例电源输出装置的另一实施例，所述电源输出装置还包括：
与所述电源转换电路201的输出端和所述电源转换电路201的控制端连接，用于当所述电源转换电路201的输出端输出的第一路电压的电压值高于电压预设值时输出过压信号至所述电源转换电路201的控制端，使所述电源转换电路201关断输出第一路电压的第一过压保护电路212；
与所述电源转换电路201的输出端和所述电源转换电路201的控制端连接，用于当所述电源转换电路201的输出端输出的第一路电压的电流值高于第一电流预设值时输出过流信号至所述电源转换电路201的控制端，使所述电源转换电路201关断输出第一路电压的第一过流保护电路213；
与所述电压切换电路201的输出端和第一控制电路205的输入端连接，用于当所述电压切换电路202的输出端输出第二路电压的电压值高于电压预设值时输出过压信号驱动所述第一控制电路205控制所述电压切换电路202关断输出第二路电压的第二过压保护电路208；
以及与所述电压切换电路202的输出端和第一控制电路205的输入端连接，用于当所述电压切换电路202的输出端输出第二路电压的电流值高于第二电流预设值时输出过流信号驱动所述第一控制电路205控制所述电压切换电路202关断输出第二路电压的第二过流保护电路209；
与所述第一过压保护电路213的输入端和第一控制电路205的输出端连接，用于当所述电压切换电路202的输出端输出第二路电压时接收第一控制电路205的控制信号关闭第一过压保护电路212的第一开关单元214；
与所述第一过流保护电路213的输入端和第一控制电路205的输出端连接，用于当所述电压切换电路202输出端输出第二路电压时接收第一控制电路205的控制信号关闭第一过流保护电路213的第二开关单元215；
与所述电源转换电路201的输出端和第一控制电路205的输入端连接，用于当所述电压切换电路202输出第二路电压时所述电源转换电路201输出第一路电压的电压值高于电压预设值时输出过压信号驱动所述第一控制电路205控制所述电源转换电路201关断输出第一路电压和所述电压切换电路202关断输出第二路电压的第三过压保护电路210；
与所述电源转换电路201的输出端和第一控制电路205的输入端连接，用于当所述电压切换电路202的输出端输出第二路电压时所述电源转换电路201输出第一路电压的电流值高于第三电流预设值时输出过流信号驱动所述第一控制电路205控制所述电源转换电路201关断输出第一路电压和所述电压切换电路202关断输出第二路电压的第三过流保护电路211。
在本发明实施例中，当负载100待机时，电源转换电路201输出第一路电压作为负载的待机电压，此时通过第一过压保护电路212和第一过流保护电路213对电源转换电路201输出的待机电压进行过压和过流保护，防止待机电压异常时对负载100造成损害，当负载100待机时待机电压发生过压或者过流，由第一过压保护电路212或第一过流保护电路213输出控制信号控制电源转换电路201停止工作，当负载100工作时，第一控制电路205控制电压切换电路202输出第二路电压，负载100的待机电压端仍有待机电压输入，由于第二路电压的输出，使流经负载待机电压端的电流会高于没有第二路电压输出时流经待机电压端的电流，因此，需要另外一套保护电路对待机电压进行保护，此时，第一控制电路205控制第一开关单元214和第二开关单元215断开，使第一过压保护电路212和第一过流保护电路213停止工作，通过第三过压保护电路210和第三过流保护电路211对待机电压进行过压和过流保护，通过第二过压保护电路208和第二过流保护电路209对第二路电压进行过压和过流保护；当负载100工作时，第二路电压过压或者过流时，由第二过压保护电路208和第二过流保护电路209向第一控制电路205发送控制信号，第一控制电路205控制电压切换电路停止输出第二路电压，当待机电压过压或者过流时，由第三过压保护电路210和第三过流保护电路211向第一控制电路205发送控制信号，第一控制电路205输出控制信号控制电源转换电路201停止工作，同时，由于此时待机电压与工作电压相同，当待机电压过压或过流时，工作电压也过压或过流，因此，在第三过压保护电路210和第三过流保护电路211发送控制信号给第一控制电路控制电源转换电路201停止工作时，也控制电压切换电路202停止输出工作电压，对负载进行保护。
需要说明的是，本实施例中，上述仅以第一保护电路、第二保护电路和第三保护电路为例对本实施例中的电源输出装置的输出过程进行了描述，可以理解的是，在实际应用中，还可以采用其他的方式例如第四保护电路和第五保护电路等多个保护电路实现电源输出装置的输出电压时对输出电压的保护，具体此处不作限定。
如图7所述，作为本发明实施例电源输出装置的另一实施例，还包括第一过流检测电路216和第二过流检测电路217，所述第一过流检测电路216的输入端与电源转换电路201的输出端连接，所述第二过流检测电路217的输入端与电压切换电路202的输出端连接；
第一过压保护电路212包括：
第一稳压管ZD1、第一光电耦合器U1以及第二NMOS管Q2；
第一稳压管ZD1的阴极为第一过压保护电路212的输入端，与电源转换电路201的输出端连接，第一稳压管ZD1的阳极与第一光电耦合器U1中发光二极管的阳极连接，第一光电耦合器U1中发光二极管的阴极与第二NMOS管Q2的漏极连接，第二NMOS管Q2的栅极为第一过压保护电路212的控制端，第一光电耦合器U1中受光器的输入端为第一过压保护电路212的输出端，第一光电耦合器U1中受光器的输出端和第二NMOS管Q2的源极接等电势地；
第一过流保护电路213包括：
第二光电耦合器U2、第三NMOS管Q3、二极管D1、第一电阻R1、第二电阻R2、第三电阻R3以及第一运算放大器UA1；
第二光电耦合器U2中发光二极管的阳极与电源转换电路201的输出端连接，第二光电耦合器U2中发光二极管的阴极与第三NMOS管Q3的漏极连接，第三NMOS管Q3的栅极与第一运算放大器UA1的输出端连接，第一电阻R1的第一端为第一过流保护电路213的第一输入端，连接所述第一过流检测电路216的第一输出端，第一电阻R1的第二端与第一运算放大器UA1的正相输入端以及第三电阻R3的第一端连接，第三电阻R3的第二端接等电势地，第二电阻R2的第一端为第一过流保护电路213的第二输入端，第二电阻R2的第二端与第一运算放大器UA1的反相输入端连接，第二光电耦合器U2中受光器的输入端为第一过流保护电路213的输出端，连接所述第一过流检测电路的第二输出端，第二光电耦合器U2中受光器的输出端和第三NMOS管Q3的源极接等电势地，二极管D1的阳极与第一运算放大器UA1的输出端连接，二极管D1的阴极为所述第一过流保护电路213的控制端；
第二过压保护电路208包括：
第四电阻R4、第五电阻R5、第六电阻R6以及第二运算放大器UA2；
第四电阻R4的第一端为第二过压保护电路208的输入端，第四电阻R4的第二端与第六电阻R6的第一端以及第二运算放大器UA2的正相输入端连接，第六电阻R6的第二端接等电势地，第五电阻R5的第一端接参考电压Vref，第五电阻R5的第二端接第二运算放大器UA2的反相输入端，第二运算放大器UA2的输出端为第二过压保护电路208的输出端；
第二过流保护电路209包括：
第七电阻R7、第八电阻R8、第九电阻R9以及第三运算放大器UA3；
第七电阻R7的第一端为第二过流保护电路209的第一输入端，连接所述第二过流检测电路217的第一输出端，第七电阻R7的第二端与第九电阻R9的第一端以及第三运算放大器UA3的正相输入端连接，第九电阻R9的第二端接等电势地，第八电阻R8的第一端为第二过流保护电路209的第二输入端，连接所述第二过流检测电路217的第二输出端，第八电阻R8的第二端与第三运算放大器UA3的反相输入端连接，第三运算放大器UA3的输出端为第二过流保护电路209的输出端；
第三过压保护电路210包括：
第十电阻R10、第十一电阻R11、第十二电阻R12以及第四运算放大器UA4；
第十电阻R10的第一端为第三过压保护电路210的输入端，第十电阻R10的第二端与第十二电阻R12的第一端以及第四运算放大器UA4的正相输入端连接，第十二电阻R12的第二端接等电势地，第十一电阻R11的第一端接参考电压Vref，第十一电阻R11的第二端接第四运算放大器UA4的反相输入端，第四运算放大器UA4的输出端为第三过压保护电路210的输出端；
第三过流保护电路211包括：
第十三电阻R13、第十四电阻R14、第十五电阻R15以及第五运算放大器UA5；
第十三电阻R13的第一端为第三过流保护电路211的第一输入端，连接所述第一过流检测电路216的第一输出端，第十三电阻R13的第二端与第十五电阻R15的第一端以及第五运算放大器UA5的正相输入端连接，第十五电阻R15的第二端接等电势地，第十四电阻R14的第一端为第三过流保护电路211的第二输入端，连接所述第一过流检测电路216的第二输出端，第十四电阻R14的第二端与第五运算放大器UA5的反相输入端连接，第五运算放大器UA5的输出端为第三过流保护电路211的输出端。
需要说明的是，上述电路中运算放大器还可以使用比较器进行替代，所述第一过流检测电路和第二过流检测电路可以为电阻或电感等，此处不做限定。
下面对本发明实施例提供的电源控制电路的工作原理进行说明：
当负载100待机时，负载100的控制信号输出端输出待机控制信号给第一控制电路205，第一控制电路205输出高电平（在本发明实施例中，设电压切换电路低电平有效）给第一NMOS管Q1的栅极，则第一NMOS管Q1截至，不能将电源转换电路201输出的待机电压切换为负载100的工作电压，负载100维持待机状态，第一过压保护电路212接收第一控制电路输出的高电平使第二NMOS管Q2导通，当待机电压过压时，通过第一光电耦合器U1中受光器的输入端将过压信号传递给电源转换电路201的第一开关控制端，使电源转换电路201停止工作，第一过流保护电路213的工作原理与第一过压保护电路212的工作原理类似，通过第一运算放大器UA1比较第一电流检测电路例如电阻或电感的两端电压，当电源转换电路201的输出端输出的第一路电压的电流值高于第一电流预设值时，通过第二光电耦合器U2中受光器的输入端将过流信号传递给电源转换电路201的控制端，使电源转换电路201停止工作，第一反馈电路203实时反馈电源转换电路201输出的待机电压的大小，驱动电源转换电路201对输出的电压的大小进行自动调节；
当负载100工作时，电源转换电路201的输出端仍与负载100的待机电压输入端连接，此时，通过第三过压保护电路210过待机电压进行过压保护，当待机电压过压时，即待机电压VS大于参考电压Vref时，第三过压保护电路210输出过压信号给所述第一控制电路205，第一控制电路205输出高电平信号（过压信号）使第一过压保护电路206工作（待机电压正常时第一控制电路205输出低电平，第一过压保护电路和第一过流保护电路不能导通工作），进而控制电源转换电路201停止工作，同时，第一控制电路205输出高电平使电压切换电路202停止输出第二路电压；当待机电压过流时，第三过流保护电路211输出过流信号给第一控制电路205，第一控制电路205输出高电平信号（过流信号）给第一过流保护电路213，进而第一过流保护电路213控制电源转换电路201停止工作，同时，第一控制电路205输出高电平使电压切换电路202停止输出第二路电压；当第二路电压即工作电压过压时，第二过压保护电路208输出过压信号给第一控制电路205，第一控制电路205输出高电平使电压切换电路202停止输出第二路电压，当工作电压过流时，第二过流保护电路209输出过流信号给第一控制电路205，第一控制电路205输出高电平使电压切换电路202停止输出第二路电压。
当负载100工作时，待机电压和工作电压都是由电源转换电路201进行输出，当待机电压和工作电压都正常时，第一控制电路输出低电平，第一过压保护电路206和第一过流保护电路207都截止（不工作）。
本实施例实现了在第二路电压无输出时，输出第一路电压作为系统的待机电压，此时系统负载电流小，第一路电压具有过流和过压保护；在第二路电压有输出时，由于系统负载电流增大，第一路电压要具有过流和过压保护，需要更换另一套保护系统保护第一电压，同时，第二路电压要具有过流和过压保护，第二路电压发生过流和过压时，保护电路起作用，第二路电压无输出，第一路电压要作为系统的待机电压一直存在。
如图8所示，本发明实施例还提供一种电源输出装置控制方法，所述电源输出装置包括电源转换电路、电压切换电路，所述电源输出装置还至少包括第一反馈电路和第二反馈电路，所述电源转换电路输入端与交流电源连接，将交流电转换为直流电从其输出端输出，所述电源转换电路的输出端作为第一路电压连接至负载，并且所述电源转换电路的输出端连接至所述电压切换电路的输入端，所述电压切换电路的输出端作为第二路电压连接至负载，所述第一反馈电路用于采样第一路电压并反馈给所述电源转换电路，所述第二反馈电路用于采样第二路电压并反馈给所述电源转换电路，所述方法包括：
301、根据负载状态控制所述电压切换电路输出第二路电压或停止输出第二路电压；
第一控制电路根据负载状态发出电压输出控制信号或电压输出中断控制信号以控制电压切换电路输出第二路电压或停止输出第二路电压，并向第二控制电路发送电压输出控制信号或电压输出中断控制信号；
所述第一控制电路可以为逻辑电路、微处理器（MCU）或者采用其它形式的集成电路，如：特定用途集成电路（Application Specific Integrated Circuit，ASIC）或现场可程序化门阵列（FieldProgrammable Gate Array，FPGA）等。
302、当所述电压切换电路输出第二路电压以及所述第一反馈电路根据采集电压值除能时调整所述第一反馈电路使所述第一反馈电路保持除能状态；
第一控制电路控制电压切换电路输出第二路电压以及所述第一反馈电路根据采集电压值除能时所述第二控制电路在根据所述电压输出控制信号调整所述第一反馈电路使所述第一反馈电路保持除能状态；
303、当所述电压切换电路停止输出第二路电压时调整所述第一反馈电路采集的电压使第二反馈电路除能并使所述第一反馈电路提供反馈信号；
第一控制电路控制电压切换电路停止输出第二路电压时所述第二控制电路根据所述电压输出中断控制信号调整所述第一反馈电路采集的电压使第二反馈电路除能并使所述第一反馈电路提供反馈信号。
如图9所示，所述步骤302的步骤具体为：
3021、当所述电压切换电路输出第二路电压时控制所述第一反馈电路根据采集的电压值除能；
3022、当所述电压切换电路输出第二路电压时控制所述第二反馈电路向电源转换电路提供反馈信号；
第一控制电路控制输出第二路电压时，第一反馈电路与第二反馈电路通过设置采集电阻，使所述第一反馈电路根据采集的电压值除能，由所述第二反馈电路向所述电源转换电路提供反馈信号；
3023、将所述第二反馈电路反馈的电压值与参考电压进行比较调节输出使第一路电压和第二路电压为第二电压值，并使输出的第二电压值小于仅发出第一路电压时的第一电压值；
所述电源转换电路将所述第二反馈电路反馈的电压值与参考电压进行比较调节输出使第一路电压和第二路电压为第二电压值V2a，所述第二电压值小于所述电源转换电路仅发出第一路电压时的第一电压值Va；
3024、调节所述第一反馈电路采集的电压值使所述第一反馈电路保持除能状态；
所述第二控制电路根据所述电压输出控制信号通过调节所述第一反馈电路采集的电压值使所述第一反馈电路保持除能状态；
具体的，所述第二控制电路通过在第一反馈电路的采集电阻两端并联电阻使第一反馈电路采集的电压变小，使第一反馈电路保持除能状态。
3025、调节所述第二反馈电路反馈的电压值；
所述第二控制电路通过在第二馈电路的采集电阻两端并联电阻使第二反馈电路采集的电压变小，第二反馈电路向电源转换电路反馈的电压值变小。
3026、将所述第二反馈电路反馈的电压值与参考电压进行比较调节输出使第一路电压和第二路电压为第三电压值，并使输出的第三电压值大于所述第一电压值和第二电压值；
所述电源转化电路将所述第二反馈电路反馈的电压值与参考电压进行比较调节输出使第一路电压和第二路电压为第三电压值V2b，所述第三电压值V2b大于所述第一电压值Va和第二电压值V2a。
如图11所示，为本发明电源输出装置输出电压切换波形图，在第一控制电路控制输出第二路电压后，电源输出装置输出的电压值先降低后升高。
如图10所示，所述步骤303的步骤具体为：
3031、当所述电压切换电路停止输出第二路电压时调整所述第一反馈电路采集的电压使第二反馈电路除能；
所述第二控制电路根据所述电压输出中断控制信号调整所述第一反馈电路采集的电压使第二反馈电路除能；
3032、当所述电压切换电路停止输出第二路电压时调整所述第一反馈电路采集的电压使所述第一反馈电路向电源转换电路提供反馈信号；
所述第二控制电路通过调整所述第一反馈电路采集的电压使所述第一反馈电路向电源转换电路提供反馈信号，通过设置第二控制电路的电路结构，第二控制电路经过第一预设时间后调节所述第一反馈电路向所述电源转换电路提供反馈信号。
3033、调整所述第二反馈电路采集的电压值；
所述第二控制电路调节所述第二反馈电路采集的电压值，所述第二控制电路在经过第二预设时间后调节第二反馈电路采集的电压值，其中，所述第一预设时间短于第二预设时间；
3034、将所述第一反馈电路反馈的电压值与参考电压进行比较调节输出使第一路电压为第一电压值。
所述电源转换电路将所述第一反馈电路反馈的电压值与参考电压进行比较调节输出使第一路电压为第一电压值Va。
本发明实施例还提供一种电源输出装置控制方法的另一个实施例，所述电源装置还至少包括：第一过压保护电路、第一过流保护电路、第二过压保护电路、第二过流保护电路、第三过压保护电路和第三过流保护电路，所述第一过压保护电路和第一过流保护电路的输入端与所述电源转换电路的输出端连接，输出端与所述电源转换电路的控制端连接，所述第二过压保护电路和第二过流保护电路的输入端与所述电压切换电路的输出端连接，输出端与所述第一控制电路的输入端连接，所述第三过压保护电路和第三过流保护电路的输入端与所述电源转换电路的输出端连接，输出端与所述第一控制电路的输入端连接，所述方法包括：
当所述电压切换电路输出第二路电压的电压值高于电压预设值时控制第二过压保护电路关断输出第二路电压，当所述电压切换电路输出第二路电压的电流值高于第二电流预设值时控制第二过流保护电路关断输出第二路电压；
其中，所述第二过压保护电路当所述电压切换电路的输出端输出第二路电压的电压值高于电压预设值时输出过压信号驱动所述第一控制电路控制所述电压切换电路关断输出第二路电压，
第二过流保护电路当所述电压切换电路的输出端输出第二路电压的电流值高于第二电流预设值时输出过流信号驱动所述第一控制电路控制所述电压切换电路关断输出第二路电压。
当所述电压切换电路输出第二路电压时所述电源转换电路输出第一路电压的电压值高于电压预设值时，控制第三过压保护电路关断输出第一路电压和第二路电压，当所述电压切换电路输出第二路电压时所述电源转换电路输出第一路电压的电流值高于第三电流预设值时，控制第三过流保护电路关断输出第一路电压和第二路电压；
其中，第三过压保护电路当所述电压切换电路的输出端输出第二路电压时所述电源转换电路输出第一路电压的电压值高于电压预设值时输出过压信号驱动所述第一控制电路控制所述电源转换电路关断输出第一路电压和所述电压切换电路关断输出第二路电压，
第三过流保护电路当所述电压切换电路输出第二路电压时所述电源转换电路输出第一路电压的电流值高于第三电流预设值时输出过流信号驱动所述第一控制电路控制所述电源转换电路关断输出第一路电压和所述电压切换电路关断输出第二路电压。
当所述电压切换电路停止输出第二路电压以及所述电源转换电路的输出端输出的第一路电压的电压值高于电压预设值时，控制第一过压保护电路关断输出第一路电压，当所述电压切换电路停止输出第二路电压以及所述电源转换电路的输出端输出的第一路电压的电流值高于第一电流预设值时，控制第一过流保护电路关断输出第一路电压；
其中，所述第一过压保护电路当所述电源转换电路的输出端输出的第一路电压的电压值高于电压预设值时输出过压信号至所述电源转换电路的控制端，使所述电源转换电路关断输出第一路电压；
所述第一过流保护电路用于当所述电源转换电路的输出端输出的第一路电压的电流值高于第一电流预设值时输出过流信号至所述电源转换电路的控制端，使所述电源转换电路关断输出第一路电压。
在本发明实施例中，第一控制电路根据负载在不同的工作状态时输出的控制信号对应控制电压切换电路是否将电源转换电路输出的待机电压转换为负载的工作电压，使负载在待机和正常工作使只需要一个电源转换电路，本发明提供的电源控制电路结构简单，且减少了电能损耗。
以上所述仅为本发明的较佳实施例而已，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种电源输出装置，其特征在于，包括：
    电源转换电路、电压切换电路、第一控制电路以及第二控制电路；
    所述电源输出装置还至少包括第一反馈电路和第二反馈电路；
    所述电源转换电路输入端与交流电源连接，将交流电转换为直流电从其输出端输出，所述电源转换电路的输出端作为第一路电压连接至负载，并且所述电源转换电路的输出端连接至所述电压切换电路的输入端，所述电压切换电路的输出端作为第二路电压连接至负载；
    所述第一反馈电路的输入端与所述电源转换电路的输出端连接，用于采集所述电源转换电路的输出端输出的第一路电压并反馈给所述电源转换电路；
    所述第一控制电路的输出端与所述电压切换电路的控制端连接，用于发出电压输出控制信号或电压输出中断控制信号以控制所述电压切换电路输出第二路电压或停止输出第二路电压，并向所述第二控制电路发送所述电压输出控制信号或所述电压输出中断控制信号；
    所述第二反馈电路的输入端与所述电压切换电路的输出端连接，用于采集所述电压切换电路的输出端输出的第二路电压并反馈给所述电源转换电路；
    所述第二控制电路的输入端与所述第一控制电路的输出端连接，所述第二控制电路的输出端与所述第一反馈电路的控制端和所述第二反馈电路的控制端连接，所述第二控制电路用于在第一控制电路控制输出第二路电压以及所述第一反馈电路根据采集电压值除能时根据所述电压输出控制信号调整所述第一反馈电路使所述第一反馈电路保持除能状态；
    所述第二控制电路还用于根据所述电压输出中断控制信号调整所述第一反馈电路采集的电压使第二反馈电路除能并使所述第一反馈电路提供反馈信号。
  2. 如权利要求1所述的电源输出装置，其特征在于，所述第一反馈电路包括：采集第一路电压的第一电压采集电路；
    与所述第一电压采集电路连接，用于将所述第一电压采集电路采集的电压值进行调整后输出的第一误差放大器；
    与所述第一误差放大器连接，用于将所述第一误差放大器输出的电压信号向所述电源转换电路输出的第一电压输出电路；
    所述第二反馈电路包括：采集第二路电压的第二电压采集电路；
    与所述第二电压采集电路连接，用于将所述第二电压采集电路采集的电压值进行调整的第二误差放大器；
    与所述第二误差放大器连接，用于将所述第二误差放大器输出的电压信号向所述电源转换电路输出的第二电压输出电路；
    所述第二控制电路与所述第一电压采集电路和所述第二电压采集电路连接，用于通过控制所述第一电压采集电路和所述第二电压采集电路以调整所述第一反馈电路和第二反馈电路的反馈状态。
  3. 如权利要求2所述的电源输出装置，其特征在于，
    所述第二控制电路包括：
    第十六电阻、第十七电阻、第十八电阻、第十九电阻、第二十电阻、第一电容、第二稳压管、第四NMOS管以及PNP型三极管；
    所述第二十电阻的第一端与所述第一控制电路连接，所述第二十电阻的第二端与所述PNP型三极管的基极、所述第二稳压管的阴极以及所述第十九电阻的第一端连接，所述第十八电阻的第一端与所述电压切换电路的输出端连接，所述第十八电阻的第二端与所述PNP型三极管的发射极、所述第十七电阻的第一端、所述第一电容的第一端以及所述第四NMOS管的栅极连接，所述PNP型三极管的集电极与所述第十九电阻的第二端、所述第二稳压管的阳极、所述第十七电阻的第二端、所述第一电容的第二端以及所述第四NMOS管的源极共接于等电势地，所述第四NMOS管的漏极与所述第十六电阻的第一端连接，所述第十六电阻的第二端与所述第一反馈电路连接；
    所述第一反馈电路中所述第一电压采集电路包括：第二十一电阻和第二十二电阻；所述第一电压输出电路为第三光电耦合器；
    所述第二十一电阻的第一端与所述电源转换电路输出端连接，所述第二十一电阻的第二端与所述第二十二电阻的第一端以及所述第一误差放大器的第一端连接，所述第二十二电阻的第二端接等电势地，所述第二十一电阻与所述第二十二电阻的公共连接端与所述第十六电阻的第二端连接，所述第三光电耦合器中发光二极管的阳极与所述电源切换电路的输出端连接，所述第三光电耦合器中发光二极管的阴极与所述第一误差放大器的第三端连接，所述第一误差放大器的第二端接等电势地，所述第三光电耦合器中受光器的输入端与所述交直流转换电路连接，所述第三光电耦合器中受光器的输出端接等电势地。
  4. 如权利要求3所述的电源转换器，其特征在于，所述第二控制电路还包括：第二十三电阻、第二十四电阻、第二十五电阻、第二电容以及第六NMOS管；
    所述第二十三电阻的第一端与所述电压切换电路的输出端连接，所述第二十三电阻的第二端与所述第六NMOS管的栅极、所述第二电容的第一端以及所述第二十四电阻的第一端连接，所述第六NMOS管的源极与所述第二电容的第二端以及所述第二十四电阻的第二端共接于等电势地，所述第六NMOS管的漏极与所述第二十五电阻的第一端连接，所述第二十五电阻的第二端与所述第二反馈电路连接；
    所述第二反馈电路中所述第二电压采集电路包括：第二十六电阻和第二十七电阻；所述第二电压输出电路为第四光电耦合器；
    所述第二十六电阻的第一端与所述电压切换电路的输出端连接，所述第二十六电阻的第二端与所述第二十七电阻的第一端以及所述第二误差放大器的第一端连接，所述第二十七电阻的第二端接等电势地，所述第二十六电阻与所述第二十七电阻的公共连接端与所述第二十五电阻的第二端连接，所述第四光电耦合器中发光二极管的阳极与所述电压切换电路的输出端连接，所述第四光电耦合器中发光二极管的阴极与所述第二误差放大器的第三端连接，所述第二误差放大器的第二端接等电势地，所述第四光电耦合器中受光器的输入端与所述电源转换电路的输出端连接，所述第四光电耦合器中受光器的输出端接等电势地。
  5. 如权利要求1所述的电源输出装置，其特征在于，还包括：
    与所述电源转换电路的输出端和所述电源转换电路的控制端连接，用于当所述电源转换电路的输出端输出的第一路电压的电压值高于电压预设值时输出过压信号至所述电源转换电路的控制端，使所述电源转换电路关断输出第一路电压的第一过压保护电路；
    与所述电源转换电路的输出端和所述电源转换电路的控制端连接，用于当所述电源转换电路的输出端输出的第一路电压的电流值高于第一电流预设值时输出过流信号至所述电源转换电路的控制端，使所述电源转换电路关断输出第一路电压的第一过流保护电路；
    与所述电压切换电路的输出端和第一控制电路的输入端连接，用于当所述电压切换电路的输出端输出第二路电压的电压值高于电压预设值时输出过压信号驱动所述第一控制电路控制所述电压切换电路关断输出第二路电压的第二过压保护电路；以及
    与所述电压切换电路的输出端和第一控制电路的输入端连接，用于当所述电压切换电路的输出端输出第二路电压的电流值高于第二电流预设值时输出过流信号驱动所述第一控制电路控制所述电压切换电路关断输出第二路电压的第二过流保护电路。
  6. 如权利要求5所述的电源输出装置，其特征在于，还包括：
    与所述第一过压保护电路的输入端和第一控制电路的输出端连接，用于当所述电压切换电路的输出端输出第二路电压时接收第一控制电路的控制信号关闭第一过压保护电路的第一开关单元；
    与所述第一过流保护电路的输入端和第一控制电路的输出端连接，用于当所述电压切换电路的输出端输出第二路电压时接收第一控制电路的控制信号关闭第一过流保护电路的第二开关单元；
    与所述电源转换电路的输出端和第一控制电路的输入端连接，用于当所述电压切换电路的输出端输出第二路电压时所述电源转换电路输出第一路电压的电压值高于电压预设值时输出过压信号驱动所述第一控制电路控制所述电源转换电路关断输出第一路电压和所述电压切换电路关断输出第二路电压的第三过压保护电路；以及
    与所述电源转换电路的输出端和第一控制电路的输入端连接，用于当所述电压切换电路输出第二路电压时所述电源转换电路输出第一路电压的电流值高于第三电流预设值时输出过流信号驱动所述第一控制电路控制所述电源转换电路关断输出第一路电压和所述电压切换电路关断输出第二路电压的第三过流保护电路。
  7. 如权利要求6所述的电源输出装置，其特征在于，还包括第一过流检测电路和第二过流检测电路，所述第一过流检测电路的输入端与所述电源转换电路的输出端连接，所述第二过流检测电路的输入端与所述电压切换电路的输出端连接；
    所述第一过压保护电路包括：
    第一稳压管、第一光电耦合器以及第二NMOS管；
    所述第一稳压管的阴极为所述第一过压保护电路的输入端，所述第一稳压管的阳极与所述第一光电耦合器中发光二极管的阳极连接，所述第一光电耦合器中发光二极管的阴极与所述第二NMOS管的漏极连接，所述第二NMOS管的栅极为所述第一过压保护电路的控制端，所述第一光电耦合器中受光器的输入端为所述第一过压保护电路的输出端，所述第一光电耦合器中受光器的输出端和所述第二NMOS管的源极接等电势地；
    所述第一过流保护电路包括：
    第二光电耦合器、第三NMOS管、二极管、第一电阻、第二电阻、第三电阻以及第一运算放大器；
    所述第二光电耦合器中发光二极管的阳极与所述电源转换电路的输出端连接，所述第二光电耦合器中发光二极管的阴极与所述第三NMOS管的漏极连接，所述第三NMOS管的栅极与所述第一运算放大器的输出端连接，所述第一电阻的第一端为所述第一过流保护电路的第一输入端，连接所述第一过流检测电路的第一输出端，所述第一电阻的第二端与所述第一运算放大器的正相输入端以及所述第三电阻的第一端连接，所述第三电阻的第二端接等电势地，所述第二电阻的第一端为所述第一过流保护电路的第二输入端，连接所述第一过流检测电路的第二输出端，所述第二电阻的第二端与所述第一运算放大器的反相输入端连接，所述第二光电耦合器中受光器的输入端为所述第一过流保护电路的输出端，所述第二光电耦合器中受光器的输出端和所述第三NMOS管的源极接等电势地，所述二极管的阳极与所述第一运算放大器的输出端连接，所述二极管的阴极为所述第一过流保护电路的控制端；
    第二过压保护电路包括：
    第四电阻、第五电阻、第六电阻以及第二运算放大器；
    所述第四电阻的第一端为所述第二过压保护电路的输入端，所述第四电阻的第二端与所述第六电阻的第一端以及所述第二运算放大器的正相输入端连接，所述第六电阻的第二端接等电势地，所述第五电阻的第一端接参考电压，所述第五电阻的第二端接所述第二运算放大器的反相输入端，所述第二运算放大器的输出端为所述第二过压保护电路的输出端；
    所述第二过流保护电路包括：
    第七电阻、第八电阻、第九电阻以及第三运算放大器；
    所述第七电阻的第一端为所述第二过流保护电路的第一输入端，连接所述第二过流检测电路的第一输出端，所述第七电阻的第二端与所述第九电阻的第一端以及所述第三运算放大器的正相输入端连接，所述第九电阻的第二端接等电势地，所述第八电阻的第一端为所述第二过流保护电路的第二输入端，连接所述第二过流检测电路的第二输出端，所述第八电阻的第二端与所述第三运算放大器的反相输入端连接，所述第三运算放大器的输出端为所述第二过流保护电路的输出端；
    所述第三过压保护电路包括：
    第十电阻、第十一电阻、第十二电阻以及第四运算放大器；
    所述第十电阻的第一端为所述第三过压保护电路的输入端，所述第十电阻的第二端与所述第十二电阻的第一端以及所述第四运算放大器的正相输入端连接，所述第十二电阻的第二端接等电势地，所述第十一电阻的第一端接所述参考电压，所述第十一电阻的第二端接所述第四运算放大器的反相输入端，所述第四运算放大器的输出端为所述第三过压保护电路的输出端；
    所述第三过流保护电路包括：
    第十三电阻、第十四电阻、第十五电阻以及第五运算放大器；
    所述第十三电阻的第一端为所述第三过流保护电路的第一输入端，连接所述第一过流检测电路的第一输出端，所述第十三电阻的第二端与所述第十五电阻的第一端以及所述第五运算放大器的正相输入端连接，所述第十五电阻的第二端接等电势地，所述第十四电阻的第一端为所述第三过流保护电路的第二输入端，连接所述第一过流检测电路的第二输出端，所述第十四电阻的第二端与所述第五运算放大器的反相输入端连接，所述第五运算放大器的输出端为所述第三过流保护电路的输出端。
  8. 如权利要求1所述的电源输出装置，其特征在于，所述电压切换电路为第一NMOS管；
    所述第一NMOS管的漏极为所述电压切换电路的电源端，所述第一NMOS管的源极为所述电压切换电路的输出端，所述第一NMOS管的栅极为所述电压切换电路的控制端。
  9. 一种电源输出装置控制方法，其特征在于，所述电源输出装置包括电源转换电路、电压切换电路，所述电源输出装置还至少包括第一反馈电路和第二反馈电路，所述电源转换电路输入端与交流电源连接，将交流电转换为直流电从其输出端输出，所述电源转换电路的输出端作为第一路电压连接至负载，并且所述电源转换电路的输出端连接至所述电压切换电路的输入端，所述电压切换电路的输出端作为第二路电压连接至负载，所述第一反馈电路用于采样第一路电压并反馈给所述电源转换电路，所述第二反馈电路用于采样第二路电压并反馈给所述电源转换电路，所述方法包括：
    根据负载状态控制所述电压切换电路输出第二路电压或停止输出第二路电压；
    当所述电压切换电路输出第二路电压以及所述第一反馈电路根据采集电压值除能时调整所述第一反馈电路使所述第一反馈电路保持除能状态；
    当所述电压切换电路停止输出第二路电压时调整所述第一反馈电路采集的电压使第二反馈电路除能并使所述第一反馈电路提供反馈信号。
  10. 如权利要求9所述的电源输出装置控制方法，其特征在于，所述电源装置还至少包括：第一过压保护电路、第一过流保护电路、第二过压保护电路、第二过流保护电路、第三过压保护电路和第三过流保护电路，所述第一过压保护电路和第一过流保护电路的输入端与所述电源转换电路的输出端连接，输出端与所述电源转换电路的控制端连接，所述第二过压保护电路和第二过流保护电路的输入端与所述电压切换电路的输出端连接，输出端与所述第一控制电路的输入端连接，所述第三过压保护电路和第三过流保护电路的输入端与所述电源转换电路的输出端连接，输出端与所述第一控制电路的输入端连接，所述方法包括：
    当所述电压切换电路输出第二路电压的电压值高于电压预设值时控制第二过压保护电路关断输出第二路电压，当所述电压切换电路输出第二路电压的电流值高于第二电流预设值时控制第二过流保护电路关断输出第二路电压；
    当所述电压切换电路输出第二路电压时所述电源转换电路输出第一路电压的电压值高于电压预设值时，控制第三过压保护电路关断输出第一路电压和第二路电压，当所述电压切换电路输出第二路电压时所述电源转换电路输出第一路电压的电流值高于第三电流预设值时，控制第三过流保护电路关断输出第一路电压和第二路电压；
    当所述电压切换电路停止输出第二路电压以及所述电源转换电路的输出端输出的第一路电压的电压值高于电压预设值时，控制第一过压保护电路关断输出第一路电压，当所述电压切换电路停止输出第二路电压以及所述电源转换电路的输出端输出的第一路电压的电流值高于第一电流预设值时，控制第一过流保护电路关断输出第一路电压。
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