CN114094823B - Multi-output power supply circuit and control method thereof - Google Patents

Multi-output power supply circuit and control method thereof Download PDF

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Publication number
CN114094823B
CN114094823B CN202110923397.1A CN202110923397A CN114094823B CN 114094823 B CN114094823 B CN 114094823B CN 202110923397 A CN202110923397 A CN 202110923397A CN 114094823 B CN114094823 B CN 114094823B
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signal
output
voltage
sampling
power supply
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CN114094823A (en
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�龙昊
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Joulwatt Technology Co Ltd
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Joulwatt Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a multi-output power supply circuit and a control method thereof, wherein the multi-output power supply circuit comprises: the first voltage conversion module is used for selecting corresponding reference voltages and sampling signals according to the working mode of the multi-output power supply circuit to convert the input voltage so as to generate a first output signal with a first voltage value in a first mode of the multi-output power supply circuit and generate a first output signal with a second voltage value in a second mode of the multi-output power supply circuit; the second voltage conversion module is used for converting the first output signal according to the third reference voltage and the third sampling signal to generate a second output signal; wherein the first voltage value is smaller than the second voltage value. The invention can reduce the voltage drop between the two output ends by reducing the first output voltage value of the multi-output power supply circuit in the first mode, and avoid the low-voltage power tube heating and unnecessary power loss caused by the larger voltage drop between the two output ends in the first mode.

Description

Multi-output power supply circuit and control method thereof
Technical Field
The invention relates to the technical field of multi-output power supply circuits, in particular to a multi-output power supply circuit and a control method thereof.
Background
The multi-output power supply generally includes at least two outputs, for example, as shown in fig. 1, one of the outputs of the multi-output power supply circuit is to generate a first output signal Vo1 from an input voltage Vin through a first switching tube 1 (e.g., a high-voltage MOS tube), where the first output signal Vo1 is mainly used as a power supply for providing an actuator 30 such as a relay; the other output is that the first output signal Vo1 is converted by the second switching tube 2 (e.g. a low-voltage MOS tube) to generate a second output signal Vo2, where the second output signal Vo2 is mainly used for providing the power requirement of the control unit 40, such as a singlechip. The voltage value of the first output signal Vo1 is usually required to be higher than that of the second output signal Vo2, for example, the voltage value of the first output signal Vo1 is usually 12V, and the voltage value of the second output signal Vo2 is usually 5V, 3.3V, or 2.7V.
In general, the actuator works when needed, so that the first output signal Vo1 is not required to be kept in a high-voltage state all the time, and when the voltage difference between the first output signal Vo1 and the second output signal Vo2 is too large, the loss on the low-voltage switching device is easily caused to be larger, and the low-voltage switching device is heated or even damaged.
Accordingly, there is a need to provide an improved solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In order to solve the above-mentioned technical problems, the present invention provides a multi-output power circuit and a control method thereof, which can reduce a voltage difference between two output terminals of the multi-output power circuit by reducing a first output voltage value of the multi-output power circuit in a first mode, so as to avoid heating and unnecessary power loss of a low-voltage power tube caused by a larger voltage drop between the two output terminals in the first mode.
According to a first aspect of the present disclosure, there is provided a multi-output power supply circuit comprising: a first voltage conversion module for receiving an input voltage, and converting the input voltage according to a sampling signal and a reference voltage selected by an operation mode of a multi-output power supply circuit, so as to generate a first output signal with a first voltage value in a first mode of the multi-output power supply circuit, and generate a first output signal with a second voltage value in a second mode of the multi-output power supply circuit;
the second voltage conversion module is connected with the first voltage conversion module, and is used for receiving the first output signal and converting the first output signal according to a third reference voltage and a third sampling signal to generate a second output signal;
Wherein the first voltage value is smaller than the second voltage value.
Optionally, the first voltage conversion module includes:
the first control unit is connected with a first output end of the multi-output power supply circuit, generates a sampling signal, receives an enabling signal corresponding to the working mode of the multi-output power supply circuit, and is used for generating a first driving control signal according to the sampling signal, the enabling signal and the reference voltage;
and the first voltage conversion unit is used for receiving the input voltage and the first driving control signal and converting the input voltage according to the first driving control signal so as to output the first output signal.
Optionally, the first control unit includes:
the first sampling unit is connected with a first output end of the multi-output power supply circuit and is used for sampling the voltage value of the first output signal and generating a first sampling signal;
a selection unit that receives the first sampling signal and the enable signal and selects a reference voltage according to the enable signal;
in the first mode, the selection unit selects a first reference voltage and the first sampling signal to compare, and in the second mode, the selection unit selects a second reference voltage and the first sampling signal to compare, and generates the first control signal according to a comparison result;
Wherein the first reference voltage is less than the second reference voltage.
Optionally, the selecting unit includes:
a first input end of the first comparison circuit receives the first sampling signal, a second input end of the first comparison circuit receives a first reference voltage, and an enabling end of the first comparison circuit receives the enabling signal;
a second comparing circuit, wherein a first input end receives the first sampling signal, and a second input end of the second comparing circuit receives a second reference voltage; the enabling end of the second comparison circuit receives a non-signal of the enabling signal;
the first input end of the OR logic circuit is connected with the output end of the first comparison circuit, the second input end of the OR logic circuit is connected with the output end of the second comparison circuit, and the output end of the OR logic circuit outputs the first control signal.
Optionally, the selecting unit includes:
a first input end of the selection switch receives a second reference voltage, a second input end of the selection switch receives the first reference voltage, and a control end of the selection switch receives the enabling signal;
and the first input end of the third comparison circuit receives the first sampling signal, the second input end of the third comparison circuit is connected with the output end of the selection switch, and the output end of the third comparison circuit outputs the first control signal.
Optionally, the first control unit includes:
the first sampling unit is connected with a first output end of the multi-output power supply circuit; sampling the voltage value of the first output signal and generating a first sampling signal and a second sampling signal, wherein the first sampling signal is smaller than the second sampling signal;
a selection unit for receiving the enable signal and the second reference voltage and selecting a sampling signal according to the enable signal;
in the first mode, the selection unit selects the second sampling signal and the second reference voltage for comparison, and in the second mode, the selection unit selects the first sampling signal and the second reference voltage for comparison, and generates a first control signal according to a comparison result.
Optionally, the first voltage conversion module further includes:
the charging unit is used for receiving the input voltage of the multi-output power supply circuit, judging whether the voltage value of the input voltage is in a preset range or not, and generating a second control signal according to a judging result;
and the logic circuit is used for receiving the first control signal and the second control signal and generating the first driving control signal according to the first control signal and the second control signal, wherein the first driving control signal is used for controlling the connection or disconnection between the voltage input end and the first output end of the multi-output power supply circuit.
Optionally, a mode control signal input by a mode control signal input end of the multi-output power supply circuit is used as the enabling signal; or alternatively
The first control unit further includes:
and the mode detection unit is connected with the mode control signal input end to receive the mode control signal and is used for outputting an enabling signal corresponding to the working mode of the multi-output power supply circuit according to the mode control signal.
Optionally, the second voltage conversion module includes:
the second sampling unit is connected with a second output end of the multi-output power supply circuit, and is used for receiving a second output signal, sampling the voltage value of the second output signal and generating a third sampling signal;
the differential amplifying circuit receives the third reference voltage at a first input end and the third sampling signal at a second input end, and is used for generating an error amplifying signal according to the third reference voltage and the third sampling signal;
a second voltage conversion unit converting the first output signal according to the error amplification signal to generate a second output signal;
wherein the sampling coefficient of the third sampling signal is the same as the sampling coefficient of the first sampling signal.
Optionally, the selection unit comprises an addition circuit,
the first input end of the adding circuit receives the third reference voltage, the second input end receives a bias voltage, and the adding circuit performs addition operation to obtain the first reference voltage;
or the first input end of the adding circuit receives the third reference voltage, the second input end receives the error amplification signal, and the adding operation is performed to obtain the first reference voltage.
Optionally, the multi-output power supply circuit further comprises:
an actuator control module for receiving the first output signal and an actuator driving signal, for switching on or off a driving path of the first output signal having a second voltage value to an external actuator according to the actuator driving signal,
when the first output signal with the second voltage value drives the actuating mechanism, the actuating mechanism and the second output end of the multi-output power supply circuit form an electric path, so that the current for driving the actuating mechanism is transmitted to the energy storage capacitor of the second output end.
Optionally, the actuator control module includes:
the cathode of the diode is connected with the first output end of the multi-output power supply circuit, and the anode of the diode is connected with the executing mechanism;
The third driver is used for receiving the actuating mechanism driving signal and generating a third driving signal according to the level state of the actuating mechanism driving signal;
and the control end of the third switching tube receives the third driving signal.
Optionally, the actuator driving signal is input from an actuator driving signal input end of the multi-output power circuit; or alternatively
The actuator control module further includes:
the first input end of the fourth comparison circuit is connected with the first sampling unit to receive a first sampling signal, the second input end of the fourth comparison circuit receives a fourth reference voltage, the enabling end of the fourth comparison circuit receives a non-signal of the enabling signal, and the output end of the fourth comparison circuit outputs the actuating mechanism driving signal;
wherein the fourth reference voltage is less than the second reference voltage and greater than the first reference voltage.
According to a second aspect of the present disclosure, there is provided a control method of a multi-output power supply circuit, adapted to the multi-output power supply circuit as described above, the control method comprising: selecting a reference voltage and a sampling signal according to an operation mode of the multi-output power supply circuit to convert the input voltage to generate a first output signal having a first voltage value in a first mode of the multi-output power supply circuit and to generate a first output signal having a second voltage value in a second mode of the multi-output power supply circuit;
Converting the first output signal based on a third reference voltage and a third sampling signal, generating a second output signal,
wherein the first voltage value is smaller than the second voltage value.
Optionally, the method further comprises:
sampling a first output end of the multi-output power supply circuit to obtain a first sampling signal representing the first output signal;
in a first mode of the multi-output power supply circuit, selecting a first reference voltage and converting an input voltage based on the first reference voltage and a first sampling signal to generate a first output signal having a first voltage value;
in a second mode of the multi-output power supply circuit, selecting a second reference voltage and converting an input voltage based on the second reference voltage and a first sampling signal to generate a first output signal having a second voltage value;
wherein the first reference voltage is less than the second reference voltage.
Optionally, the method further comprises:
sampling a first output end of the multi-output power supply circuit to obtain a first sampling signal and a second sampling signal representing the first output signal, wherein the first sampling signal is smaller than the second sampling signal;
Selecting a second sampling signal in a first mode of the multi-output power supply circuit, and converting an input voltage based on a second reference voltage and the second sampling signal to generate a first output signal having a first voltage value;
in a second mode of the multi-output power supply circuit, a first sampling signal is selected and an input voltage is converted based on a second reference voltage and the first sampling signal to generate a first output signal having a second voltage value.
The beneficial effects of the invention are as follows: the invention discloses a multi-output power supply circuit and a control method thereof, wherein in the process of converting input voltage based on reference voltage and sampling signal to generate a first output signal, different reference voltage and sampling signal are selected to generate the first output signal with different voltage values under different working modes (including a first mode and a second mode, the first mode is a standby mode, the second mode is a non-standby mode, for example) of the multi-output power supply circuit, so that the voltage value of the first output signal under the first mode is smaller than the voltage value under the second mode, the voltage difference between two output ends of the multi-output power supply circuit can be reduced under the first mode, and the heating and unnecessary power loss of a low-voltage power tube caused by larger voltage drop between the two output ends under the first mode are avoided.
On the other hand, since the voltage value of the first output signal in the first mode is reduced compared with that in the second mode, the voltage value of the input voltage for charging the first capacitor at the first output end is also reduced (as long as the first capacitor can be fully charged), so that the loss of the high-voltage power tube (i.e. the first switching tube) between the voltage input end and the first output end is not increased in the first mode.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
FIG. 1 is a schematic diagram of a voltage conversion principle of a multi-output power supply circuit;
FIG. 2 shows a schematic diagram of an application architecture of a multiple output power supply circuit;
FIG. 3 shows a block diagram of a multi-output power circuit provided in accordance with an implementation of the present disclosure;
fig. 4 is a schematic circuit diagram showing a multi-output power supply circuit provided according to a first embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram showing a multi-output power supply circuit according to a second embodiment of the present disclosure;
fig. 6 is a schematic circuit diagram showing a multi-output power supply circuit according to a third embodiment of the present disclosure;
fig. 7 is a schematic circuit diagram showing a multi-output power supply circuit according to a fourth embodiment of the present disclosure;
Fig. 8 is a schematic diagram showing a circuit configuration of a multi-output power supply circuit provided according to a fifth embodiment of the present disclosure;
fig. 9 shows a flow chart of a control method of a multi-output power supply circuit provided according to an embodiment of the present disclosure.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The present invention will be described in detail with reference to the accompanying drawings.
Fig. 2 shows a schematic diagram of an application structure of the multi-output power supply circuit.
As shown in fig. 2, in this application, the voltage input pin VIN of the multi-output power circuit chip 20 is connected to the rectifier 10, and the rectifier 10 receives the power supply voltage via the first resistor R1. The supply voltage is, for example, an ac voltage.
The first output pin VCC of the multi-output power supply circuit chip 20 is connected to the first input terminal of the first relay and the first input terminal of the second relay in the actuator 30, respectively, the first load pin PLY1 of the multi-output power supply circuit chip 20 is connected to the second input terminal of the first relay, and the second load pin PLY2 of the multi-output power supply circuit chip 20 is connected to the second input terminal of the second relay. The first actuator driving signal input pin DRV1, the second actuator driving signal input pin DRV2, the synchronization pin SYN, the mode control signal input pin STB, and the second output pin Vo of the multi-output power circuit chip 20 are all connected to a control unit 40 (e.g., a microcontroller MCU). The ground pin GND of the multi-output power supply circuit chip 20 is connected to the reference ground.
Further, a first output capacitor C1 is further connected between the first output pin VCC and the ground pin GND of the multi-output power supply circuit chip 20; a second output capacitor C2 is further connected between the second output pin Vo of the multi-output power circuit chip 20 and the ground pin GND.
The multi-output power circuit chip 20 is configured to convert the dc voltage signal received from the voltage input pin VIN, output a first output signal Vo1 at the first output pin VCC to drive the actuator 30, and output a second output signal Vo2 at the second output pin Vo to drive the control unit 40. Specifically, the internal structure of the multi-output power supply circuit chip 20 is shown in fig. 3 to 8.
Example 1
Referring to fig. 3, in the present disclosure, a multi-output power supply circuit includes: a first voltage conversion module 21, a second voltage conversion module 22.
The input end of the first voltage conversion module 21 receives the input voltage Vin, and is configured to select a corresponding reference voltage and a sampling signal according to different operation modes (including a first mode and a second mode) of the multi-output power circuit, so as to convert the input voltage Vin, so as to generate a first output signal Vo1 with a first voltage value in the first mode (e.g., a standby mode) of the multi-output power circuit, and generate a first output signal Vo1 with a second voltage value in the second mode (e.g., a non-standby mode) of the multi-output power circuit.
The first voltage conversion module 21 further includes: a first control unit 211 and a first voltage conversion unit 213.
The first control unit 211 is connected to the first output terminal of the multi-output power circuit, generates a sampling signal, and receives an enable signal corresponding to an operation mode of the multi-output power circuit. The first control unit 211 is configured to generate a first driving control signal according to the sampling signal, the enable signal, and the reference voltage.
Alternatively, a mode detecting unit 212 connected to the mode control signal input STB of the multi-output power circuit may be provided in the first voltage converting module 21, and the mode detecting unit 212 receives a mode control signal provided from the external control unit 40 and outputs an enable signal corresponding to an operation mode of the multi-output power circuit according to the received mode control signal. The mode control signal input from the mode control signal input terminal STB of the multi-output power circuit may be directly used as the enable signal.
It will be appreciated that the input of the mode detection unit 212 receives a mode control signal provided by the external control unit 40, and when the mode control signal is a digital signal, the mode detection unit 212 may convert the mode control signal into a corresponding analog signal and output an enable signal as a subsequent device or unit. Meanwhile, when the mode control signal is an analog signal, the mode detection unit 212 may not be provided in the selection unit 2112, that is, the mode control signal input terminal STB of the multi-output power supply circuit may be directly connected to the enable terminal of the subsequent device or unit. The method can be reasonably selected according to actual conditions.
In this embodiment, the enable signal corresponding to the multi-output power supply circuit in the first mode is at a low level.
Further, in the present embodiment, referring to fig. 4, the first control unit 211 further includes: a first sampling unit 2111 and a selection unit 2112.
The first sampling unit 2111 is connected to a first output terminal of the multi-output power circuit, and is configured to sample a voltage value of the first output signal Vo1 and generate a first sampling signal.
The selection unit 2112 is connected to the first sampling unit 2111, receives the enable signal and the first sampling signal generated by the first sampling unit 2111, selects the reference voltage according to the enable signal and the first sampling signal to compare, and generates the first control signal according to the comparison result. Illustratively, in a first mode of the multi-output power supply circuit, the select unit 2112 is configured to select the first reference voltage V OUTREF+2V Comparing with the first sampled signal; while in the second mode of the multi-output power supply circuit, the selection unit 2112 is set to select the second reference voltage V CCOFF1 And comparing the first sampled signal. Wherein the first reference voltage V OUTREF+2V Less than the second reference voltage V CCOFF1 。
In the present embodiment, it can be understood that the first reference voltage V OUTREF+2V And a second reference voltage V CCOFF1 Can be provided by independent reference voltage generating circuits to ensure the stability and accuracy of each reference voltage.
The first voltage conversion unit 213 is connected to the first control unit 211 to receive a first driving control signal, and is configured to connect or disconnect an electrical connection between the voltage input terminal VIN and the first output terminal of the multi-output power circuit according to the first driving control signal, so as to convert the input voltage VIN to obtain a first output signal Vo1.
In this embodiment, the first sampling unit 2111 is configured to sample the voltage value of the first output signal Vo1 according to the first sampling coefficient and generate a first sampling signal. And further, as shown in fig. 4, the selecting unit 2112 includes: a first comparison circuit U1, a second comparison circuit U2, an inverter U3, and an or logic circuit U4.
A first input terminal of the first comparing circuit U1 is connected to the first sampling unit 2111 to receive a first sampling signal, and a second input terminal of the first comparing circuit U1 receives a first reference voltage (in this embodiment, the first reference voltage is V OUTREF+2V ) The enable terminal of the first comparison circuit U1 receives the enable signal.
A first input terminal of the second comparison circuit U2 is connected to the first sampling unit 2111 for receiving the first sampling signal, and a second input terminal of the second comparison circuit U2 receives the second reference voltage V CCOFF1 The enable end of the second comparison circuit U2 receives a non-signal of the enable signal.
In this embodiment, the first comparing circuit U1 and the second comparing circuit U2 are, for example, hysteresis comparators, which convert the received reference voltage into two threshold voltages corresponding to the reference voltage value (for example, one threshold voltage is slightly greater than the reference voltage, and the other threshold voltage is slightly less than the reference voltage) based on the circuit structure and the working principle of the hysteresis comparators. Further, when the hysteresis comparator is in operation, the input voltage Vin can be converted into voltage values in a voltage range corresponding to the two threshold voltages. Further, when the first sampling unit 2111 adopts the same samplingWhen the sampling coefficient, i.e. the first sampling coefficient, samples the voltage value of the first output signal Vo1, the first reference voltage V is set OUTREF+2V Less than the second reference voltage V CCOFF1 The first output signal Vo1 having the first voltage value generated based on the first comparison circuit U1 may be made smaller than the first output signal Vo1 having the second voltage value generated based on the second comparison circuit U2, that is, the first voltage value is smaller than the second voltage value.
Further, the input end of the inverter U3 receives the enable signal, and the output end is connected to the enable end of the second comparing circuit U2. The first input end of the logic circuit U4 is connected with the output end of the first comparison circuit U1, the second input end of the logic circuit U4 is connected with the output end of the second comparison circuit U2, or the output end of the logic circuit U4 outputs a first control signal.
Further, the first control unit 211 further includes: a charging unit 2113 and an and logic circuit U5. The charging unit 2113 receives an input voltage Vin of the multi-output power circuit, and is configured to determine whether a voltage value of the input voltage Vin is within a preset range, and generate a second control signal to a first input terminal of the and logic circuit U5 according to a determination result. It can be appreciated that the charging unit 2113 can trigger and control the main circuit structure of the multi-output power circuit to be disabled when the input voltage Vin is abnormal, thereby ensuring the stability of the multi-output power circuit. The first input end of the and logic circuit U5 is connected to the output end of the charging unit 2113 to receive the second control signal, the second input end of the and logic circuit U5 is connected to the output end of the or logic circuit U4 to receive the first control signal, and the and logic circuit U5 is configured to generate the first driving control signal according to the received first control signal and the second control signal. The first driving control signal is used for controlling connection or disconnection between a voltage input end VIN and a first output end of the multi-output power circuit.
In this embodiment, the first voltage conversion unit 213 further includes: a first driver 2131 and a first switching tube M1. Wherein the input of the first driver 2131 is connected to the output of the selection unit 2112. And the first switching tube M1 is connected between the voltage input end VIN and the first output end of the multi-output power circuit, and the control end of the first switching tube M1 is connected with the output end of the first driver 2131. The first driver 2131 is for controlling the on and off of the first switching tube M1 according to the level state of the first driving control signal output from the and logic circuit U5.
It can be understood that the first driver 2131 can enhance the signal output by the and logic circuit U5 and output the enhanced signal to the control end of the first switching tube M1, thereby realizing on-off control of the first switching tube M1. When the signal output from the and logic circuit U5 is a digital signal, the first driver 2131 may convert the digital signal into a corresponding analog signal and output the analog signal to the gate of the first switching tube M1.
The first switching transistor M1 is an NMOS field effect transistor, and the drain of the first switching transistor M1 is connected to the voltage input terminal VIN, the source of the first switching transistor M1 is connected to the first output terminal, and the gate of the first switching transistor M1 is connected to the output terminal of the first driver 2131.
In the present disclosure, the second voltage conversion module 22 is connected to the first voltage conversion module 21, and receives the first output signal Vo1, and is configured to convert the first output signal Vo1 according to the third reference voltage and the third sampling signal to generate the second output signal Vo2.
In this embodiment, the second voltage conversion module 22 includes: a second sampling unit 221, a differential amplifying circuit U6, and a second voltage converting unit 222. The second sampling unit 221 is connected to the second output end of the multi-output power circuit, and receives the second output signal Vo2, and is configured to sample the voltage value of the second output signal Vo2 according to the first sampling coefficient and generate a third sampling signal. The first input terminal of the differential amplifying circuit U6 receives the third reference voltage V OUTREF A second input terminal of the differential amplification circuit U6 is connected with the output terminal of the second sampling unit 221 to receive a third sampling signal, and the differential amplification circuit U6 is used for receiving a third reference voltage V OUTREF And the third sampled signal generates an error amplified signal (referred to herein as Vcomp). The second voltage conversion unit 222 is configured to convert the first output signal Vo1 according to the differential amplified signal to generate a second output signal.
Further, the second voltage conversion unit 222 further includes: a second driver 2221 and a second switching transistor M2. An input terminal of the second driver 2221 is connected to an output terminal of the differential amplifying circuit U6, and an output terminal of the second driver 2221 is connected to a control terminal of the second switching transistor M2. The second switching tube M2 is connected between the first output end and the second output end of the multi-output power supply circuit.
In the present embodiment, it can be understood that the third reference voltage V OUTREF Can be provided by an independent reference voltage generating circuit to ensure the stability and the accuracy of each reference voltage.
In this embodiment, the sampling coefficient of the third sampling signal is the same as the sampling coefficient of the first sampling signal.
Alternatively, a comparison unit may be disposed in the second driver 2221, and when the error amplification signal Vcomp is greater than the first preset value, the second driver 2221 may control the second switching transistor M2 to be turned on, and when the error amplification signal Vcomp is less than the second preset value, the second driver 2221 may control the second switching transistor M2 to be turned off. Meanwhile, the second driver 2221 may further enhance the signal output by the comparing unit and output the signal to the control end of the second switching tube M2, so as to realize on-off control of the second switching tube M2.
The second switching transistor M2 is an NMOS field effect transistor, and the drain of the second switching transistor M2 is connected to the first output terminal, the source of the second switching transistor M2 is connected to the second output terminal, and the gate of the second switching transistor M2 is connected to the output terminal of the second driver 2221.
In the present embodiment, the third reference voltage V OUTREF The voltage values of (a) are smaller than the first reference voltage V OUTREF+2V And a second reference voltage V CCOFF1 In this way, it is ensured that the conversion of the first output signal Vo1 to the second output signal Vo2 is achieved.
Specifically, in this embodiment, the working principle of the multi-output power supply circuit is as follows:
in the second mode of the multi-output power circuit, the mode control signal input STB receives the mode control signal before the actuator 30 is required to operateThe signal is at high level, that is, the enable signal outputted by the mode detection unit 212 is at high level, the enable signal at high level controls the first comparison circuit U1 to be inactive, and the second comparison circuit U2 to be active, so that the first voltage conversion module 21 selects the second reference voltage V CCOFF1 And the first sampling unit 2111 compares the first sampling signal obtained by sampling the voltage value of the first output signal Vo1 according to the first sampling coefficient when the voltage value of the first sampling signal is greater than the second reference voltage V CCOFF1 When the upper threshold of the second comparison circuit U2 is generated by conversion, the logic circuit U4 outputs a low-level first control signal, and the first driver 2131 controls the first switching tube M1 to be turned off; when the voltage value of the first sampling signal is smaller than the second reference voltage V CCOFF1 When the second comparison circuit U2 is generated by conversion, or the logic circuit U4 outputs the first control signal with a high level, and the charging unit 2113 detects that the voltage value of the input voltage Vin is also within the preset range, the first driver 2131 controls the first switching tube M1 to be turned on, and the input voltage Vin charges the first output capacitor C1 connected to the first output end (refer to fig. 2), so that the voltage value of the first output signal Vo1 can be maintained at the set second voltage value (e.g. 12V) after a certain time delay.
Further, in the present embodiment, the second voltage conversion module 22 samples the voltage value of the second output signal Vo2 according to the first sampling coefficient by the second sampling unit 221 to obtain a third sampling signal, and generates a third reference voltage V between the third sampling signal and the third sampling signal OUTREF The difference between the first output signal Vo1 and the second reference voltage V is greater than the first preset value, the second switch tube M2 is controlled to be turned on, the first output signal Vo1 charges the second output capacitor C2 connected to the second output terminal (see fig. 2), and when the third sampling signal is equal to the third reference voltage V OUTREF When the difference value of the second voltage Vo2 is smaller than the second preset value, the second switch tube M2 is controlled to be turned off, so that the voltage value of the second output signal Vo2 can be maintained at the set voltage value (e.g. 5V).
In the first mode of the multi-output power circuit, the mode control signal received by the mode control signal input STB is low, i.e. the first mode is detectedThe enable signal output by the unit 212 is at a low level, and the enable signal of the low level controls the first comparison circuit U1 to operate, and the second comparison circuit U2 is not operated, so that the first voltage conversion module 21 selects the first reference voltage V OUTREF+2V And the first sampling unit 2111 compares the first sampling signal obtained by sampling the voltage value of the first output signal Vo1 according to the first sampling coefficient when the voltage value of the first sampling signal is greater than the first reference voltage V OUTREF+2V When the upper threshold of the first comparison circuit U1 is generated by conversion, the logic circuit U4 outputs a low-level first control signal, and the first driver 2131 controls the first switching tube M1 to be turned off; when the voltage value of the first sampling signal is smaller than the first reference voltage V OUTREF+2V When the lower threshold of the first comparison circuit U1 generated by the conversion is lower, or the logic circuit U4 outputs a high-level first control signal, and the charging unit 2113 detects that the voltage value of the input voltage Vin is within the preset range, the first driver 2131 controls the first switching tube M1 to be turned on, and the input voltage Vin charges the first output capacitor C1 connected to the first output end (refer to fig. 2), so that the voltage value of the first output signal Vo1 is maintained at the set first voltage value (e.g. 7V). The second voltage conversion module 22 operates in the same manner as described above.
In this embodiment, before the actuator 30 is required to operate, the mode control signal input STB of the multi-output power circuit receives a high-level mode control signal, so as to control the multi-output power circuit to operate in the second mode, so that the voltage value of the first output signal Vo1 can be maintained at the set second voltage value (e.g. 12V) after being delayed for a certain time. Further, when the actuator driving signal input terminal DRV1 of the multi-output power circuit receives the actuator driving signal, the first output signal Vo1 having the second voltage value drives the actuator 30 to operate. After the execution mechanism 30 performs the response, it can output a low-level mode control signal to the mode control signal input STB, and control the multi-output power circuit to operate in the first mode again, so as to maintain the voltage value of the first output signal Vo1 slightly higher than that of the second output signal Vo 2.
In the present embodiment of the present invention,in the first mode, the first reference voltage V OUTREF+2V The voltage value of (2) is smaller than the second reference voltage V CCOFF1 Under the condition of keeping the second output signal Vo2 stable, the voltage value of the first output signal Vo1 can be only slightly higher than the voltage value of the second output signal Vo2, for example, only about 2V, compared with a large voltage difference brought by two power ends of the second switching tube M2 when the first output signal Vo1 is 12V, in the embodiment, a small new reference voltage is selected in the first mode, the voltage difference between the two power ends of the second switching tube M2 can be reduced in the first mode, the low-voltage power tube (namely the second switching tube M2) caused by a large voltage drop in the first mode is prevented from heating, and the loss can be greatly reduced.
Example two
The circuit structure of the multi-output power supply circuit provided in this embodiment is shown in fig. 5.
Specifically, the circuit structure of the multi-output power supply circuit provided in this embodiment is substantially the same as that of the first embodiment, and therefore will not be described again.
The difference is that: in this embodiment, the selection unit 2112 includes: a selection switch 21122 and a third comparison circuit U7. Wherein the first input terminal of the selector switch 21122 receives the second reference voltage V CCOFF1 A second input terminal of the selection switch 21122 receives the first reference voltage, and a control terminal of the selection switch 21122 receives the enable signal. A first input terminal of the third comparison circuit U7 is connected to the first sampling unit 2111 to receive the first sampling signal, a second input terminal of the third comparison circuit U7 is connected to an output terminal of the selection switch 21122, and an output terminal of the third comparison circuit U7 outputs the first control signal.
Compared with the structure of the selection unit 2112 in the first embodiment, the selection unit 2112 in the present embodiment requires fewer circuit devices and has a simpler structure.
Further, in the present embodiment, the selecting unit 2112 includes: adder 21121. A first input terminal of the adder circuit 21121 receives a third reference voltage V OUTREF A second input of the adder 21121 receives a bias voltage or error amplified signal Vcomp. The method comprisesAn output terminal of the adding circuit 21121 is connected to a second input terminal of the selection switch 21122. That is, the first reference voltage received by the second input terminal of the selection switch 21122 in this embodiment is the third reference voltage V by the adder 21121 OUTREF And a bias voltage, or the third reference voltage V may be obtained by adding the bias voltage with the adding circuit 21121 OUTREF And the error amplification signal Vcomp are obtained after addition.
Specifically, in this embodiment, the working principle of the multi-output power supply circuit is as follows:
the operation principle of the second voltage conversion module 22 is the same as that of the first embodiment, and will not be repeated here.
In the second mode of the multi-output power supply circuit, the operation principle of the first voltage converting unit 21 is also substantially the same as that of the first embodiment, and the same points will not be described in detail. The difference is that the high-level enable signal outputted from the mode detection unit 212 controls the selection switch 21122 to connect the output terminal thereof with the first input terminal, thereby connecting the second reference voltage V CCOFF1 A second input terminal of the third comparison circuit U7 is output to enable the first voltage conversion module 21 to select the second reference voltage V CCOFF1 And the first sampling unit 2111 compares the first sampling signal obtained after sampling the voltage value of the first output signal Vo1 according to the first sampling coefficient, so that the voltage value of the first output signal Vo1 can be maintained at the set second voltage value (e.g. 12V) after being delayed for a certain time.
In the first mode of the multi-output power circuit, the low-level enable signal outputted by the first mode detection unit 212 controls the selection switch 21122 to connect the output terminal thereof with the second input terminal, and further outputs the output signal of the adder 21121 to the second input terminal of the third comparator U7. So that the first voltage conversion module 21 selects a first reference voltage (taking the second input terminal of the adding circuit 21121 receiving the error amplification signal Vcomp as an example, the first reference voltage is V OUTREF +Vcomp) and the first sampling unit 2111 compare the first sampling signal obtained by sampling the voltage value of the first output signal Vo1 according to the first sampling coefficient, thereby realizing the second-based samplingThe voltage value of the output signal Vo2 is adaptively adjusted to the voltage value of the first output signal Vo 1. Specifically, when the load at the second output terminal increases such that the voltage value of the second output signal Vo2 is higher than the third reference voltage V OUTREF When the voltage value of the second output signal Vo2 increases by controlling the second switching transistor M2 to be turned on, the error amplification signal Vcomp increases slightly OUTREF The +Vcomp is also increased, so that the voltage value of the stabilized first output signal Vo1 is also increased, the second output signal Vo2 can be quickly restored to a stable value, and the margin for stabilizing the second output signal Vo2 is also increased. When the load at the second output terminal is reduced so that the voltage value of the second output signal Vo2 is smaller than the third reference voltage V OUTREF When the voltage value of the second output signal Vo2 is reduced by controlling the second switching transistor M2 to be turned off, the error amplification signal Vcomp is reduced, and the first reference voltage V OUTREF The +Vcomp is also reduced, and the voltage value of the stabilized first output signal Vo1 is also reduced, so that the voltage value of the first output signal Vo1 is controlled and regulated to be slightly higher than the voltage value of the second output signal Vo2 when the voltage value of the second output signal Vo2 is finally stable.
In this embodiment, in the first mode of the multi-output power circuit, the setting of the voltage value of the first output signal Vo1 in the steady state is adaptively controlled by the second output signal Vo2, i.e. the voltage value of the first output signal Vo1 does not need to be manually set to be slightly higher than 2V or other voltage values than the second output signal Vo2, and the error amplification signal Vcomp can automatically adjust the reference voltage of the first output signal Vo1, thereby more rapidly maintaining the voltage stability of the second output signal Vo 2. On the other hand, the difference between the voltage value of the first output signal Vo1 and the voltage value of the second output signal Vo2 in the steady state is smaller, so that the loss can be further reduced.
Example III
The circuit structure of the multi-output power supply circuit provided in this embodiment is shown in fig. 6.
Specifically, the circuit structure of the multi-output power supply circuit provided in this embodiment is substantially the same as that of the first embodiment, and therefore will not be described again.
The difference is that: in the present embodiment, the first sampling unit 2111 includes a first sampling subunit 21111 and a second sampling subunit 21112. The first sampling subunit 21111 is configured to sample a voltage value of the first output signal Vo1 and generate a first sampling signal; the second sampling subunit 2112 is configured to sample the voltage value of the first output signal Vo1 and generate a second sampling signal.
In this implementation, the selection unit 2112 is configured to receive the enable signal and the second reference voltage for selecting the sampling signal according to the enable signal. Specifically, in the first mode, the selection unit 2112 selects the second sampling signal and the second reference voltage for comparison; in the second mode, the selection unit 2112 selects the first sampling signal and the second reference voltage to compare, and generates the first control signal according to the comparison result.
Further, in the present embodiment, the selecting unit 2112 includes: a first comparison circuit U1, a second comparison circuit U2, an inverter U3, and an or logic circuit U4. Wherein the first input end of the first comparison circuit U1 receives the second sampling signal, and the second input end of the first comparison circuit U1 receives the second reference voltage V CCOFF1 The enable terminal of the first comparison circuit U1 receives the enable signal. A first input terminal of the second comparison circuit U2 receives the first sampling signal, and a second input terminal of the second comparison circuit U2 receives the second reference voltage V CCOFF1 . The input end of the inverter U3 receives the enabling signal, and the output end of the inverter U3 is connected with the enabling end of the second comparison circuit U2. The first input end of the logic circuit U4 is connected with the output end of the first comparison circuit U1, the second input end of the logic circuit U4 is connected with the output end of the second comparison circuit U2, or the output end of the logic circuit U4 outputs a first control signal.
In this embodiment, the first comparison circuit U1 and the second comparison circuit U2 are, for example, hysteresis comparators, which convert the received reference voltage into two threshold voltages corresponding to the reference voltage value (for example, one threshold voltage is slightly larger than the reference voltage) based on the circuit structure and the working principle of the hysteresis comparatorsVoltage, the other threshold voltage is slightly less than the reference voltage). Further, when the hysteresis comparator is in operation, the input voltage Vin can be converted into voltage values in a voltage range corresponding to the two threshold voltages. Further, when the first and second comparing circuits U1 and U2 use the same reference voltage, such as the second reference voltage V CCOFF1 At this time, the first sampling sub-unit 21111 and the second sampling sub-unit 21112 may be configured to sample the voltage value of the first output signal Vo1 based on different sampling coefficients, respectively, such that the first output signal Vo1 having the first voltage value generated based on the first comparison circuit U1 is smaller than the first output signal Vo1 having the second voltage value generated based on the second comparison circuit U2, that is, the first voltage value is smaller than the second voltage value. Specifically, the sampling coefficient of the first sampling subunit 21111 may be set smaller than the sampling coefficient of the second sampling subunit 21112, so that the first sampling signal is smaller than the second sampling signal.
Specifically, in this embodiment, taking the sampling coefficient of the first sampling subunit 21111 as 1/3 and the sampling coefficient of the second sampling subunit 21112 as 1/2 as an example, the working principle of the multi-output power circuit is as follows:
the operation principle of the first voltage conversion module 21 and the second voltage conversion module 22 is substantially the same as that of the first embodiment, and therefore, the same points are not described herein.
The difference is that in the second mode of the multi-output power circuit, the first comparing circuit U1 in the first voltage converting module 21 is not operated, and the second comparing circuit U2 is operated, so that the first voltage converting module 21 selects the second reference voltage V CCOFF1 Comparing with the first sampling signal obtained after sampling by the first sampling subunit 2111, when the voltage value (equal to Vo1 x 1/3) of the first sampling signal is greater than the second reference voltage V CCOFF1 When the upper threshold of the second comparison circuit U2 is generated by conversion, the logic circuit U4 outputs a low-level first control signal, and the first driver 2131 controls the first switching tube M1 to be turned off; when the voltage value of the first sampling signal is smaller than the second reference voltage V CCOFF1 When the lower threshold of the second comparison circuit U2 generated by conversion is lower than the lower threshold, the OR logic circuit U4 outputs highWhen the charging unit 2113 detects that the voltage value of the input voltage Vin is within the preset range, the first driver 2131 controls the first switching tube M1 to be turned on, and the input voltage Vin charges the first output capacitor C1 connected to the first output terminal (refer to fig. 2), so that the voltage value of the first output signal Vo1 in a stable state after a certain delay time satisfies the following relationship:
in the first mode of the multi-output power circuit, the first comparison circuit U1 in the first voltage conversion module 21 is operated, and the second comparison circuit U2 is not operated, so that the first voltage conversion module 21 selects the second reference voltage V CCOFF1 Comparing with the second sampling signal obtained after sampling by the second sampling subunit 2112, when the voltage value of the second sampling signal is larger than the second reference voltage V CCOFF1 When the upper threshold of the first comparison circuit U1 is generated by conversion, the logic circuit U4 outputs a low-level first control signal, and the first driver 2131 controls the first switching tube M1 to be turned off; and when the voltage value of the second sampling signal is smaller than the second reference voltage V CCOFF1 When the lower threshold of the first comparison circuit U1 generated by conversion is lower, or the logic circuit U4 outputs a first control signal with a high level, and the charging unit 2113 detects that the voltage value of the input voltage Vin is also within the preset range, the first driver 2131 controls the first switching tube M1 to be turned on, and the input voltage Vin charges the first output capacitor C1 connected to the first output end (refer to fig. 2), so that the voltage value of the first output signal Vo1 in a stable state after a certain delay time satisfies the following relation:
as can be understood from the combination of the formulas (1) and (2), the voltage value of the stabilized first output signal Vo1 in the first mode is smaller than the voltage value of the stabilized first output signal Vo1 in the second mode.
In the present embodiment, based on the second reference voltage V CCOFF1 And the sampling signals corresponding to different sampling coefficients can also ensure that the voltage value of the first output signal Vo1 in the first mode is smaller than that of the first output signal Vo1 in the second mode under the condition of keeping the first output signal Vo1 stable, so that the voltage difference between two power ends of the second switching tube M2 is reduced in the first mode, the purpose of heating the low-voltage power tube (namely the second switching tube M2) caused by larger voltage drop in the first mode is avoided, and the loss can be greatly reduced.
Example IV
The circuit structure of the multi-output power supply circuit provided in this embodiment is shown in fig. 7.
Specifically, the circuit structure of the multi-output power supply circuit provided in this embodiment is substantially the same as any one of the first to third embodiments, and thus will not be described in detail.
The difference is that: the embodiment further includes an actuator control module 23, where the actuator control module 23 is connected to the first voltage conversion module 21, and receives the first output signal Vo1 and the actuator driving signal, and is configured to connect or disconnect a driving path of the first output signal Vo1 having the second voltage value to the external actuator 30 according to the actuator driving signal.
The actuator control module 23 further includes: a diode D1, a third driver 231, and a third switching tube M3. The cathode of the diode D1 is connected to the first output terminal of the multi-output power circuit, and the anode of the diode D1 is connected to the first load terminal PLY1 of the multi-output power circuit. The input end of the third driver 231 is connected to the first driving signal input end DRV1 (i.e. the actuator driving signal input end) of the multi-output power circuit to receive the actuator driving signal, and the third driver 231 is configured to generate the third driving signal according to the level state of the actuator driving signal. The third switching tube M3 is connected between the anode of the diode D1 and the first node, and the control end of the third switching tube M3 is connected to the output end of the third driver 231 to receive the third driving signal.
In this embodiment, the first node may be connected to the second output terminal of the multi-output power circuit or to the ground. And the actuator driving signal received by the third driver 231 is input from the actuator driving signal input terminal DRV1 of the multi-output power circuit.
The third switching transistor M3 is an NMOS field effect transistor, and the drain of the third switching transistor M3 is connected to the anode of the diode D1, the source of the third switching transistor M3 is connected to the first node, and the gate of the third switching transistor M3 is connected to the output terminal of the third driver 231.
That is, in the second mode of the multi-output power circuit, when the first output signal Vo1 having the second voltage value drives the actuator 30, the actuator 30 and the second output terminal of the multi-output power circuit form an electrical path, so that when the third switching tube M3 is turned on, the current for driving the external actuator 30 to act is transmitted to the energy storage capacitor C2 of the second output terminal for energy storage, so as to be used by the load connected to the second output terminal. Meanwhile, compared with the scheme that the first node is connected with the reference ground, the first node is connected with the second output end of the multi-output power circuit, so that the energy utilization rate can be improved, and the energy is saved.
Specifically, in the present embodiment, in the first mode of the multi-output power circuit, as in the previous embodiment, the voltage value of the first output signal Vo1 is controlled to be slightly higher than the voltage value of the second output signal Vo2 (e.g. about 2V), so as to reduce the voltage difference of the second switching tube M2.
Further, according to the connection structure of the multi-output power circuit in the present embodiment, in order to ensure that the external actuator 30 can still be driven normally in the second mode, the voltage value of the first output signal Vo1 should be increased by a voltage value (e.g. 5V) corresponding to the second output signal Vo2 based on the value set in the foregoing embodiment. For example, in the present embodiment, the second reference voltage V is set CCOFF1 The voltage value of Vo1 is 12v+5v=17v, and finally the voltage value of the stabilized first output signal Vo1 is maintained at 17V.
Example five
The circuit structure of the multi-output power supply circuit provided in this embodiment is shown in fig. 8.
Specifically, the circuit structure of the multi-output power supply circuit provided in this embodiment is substantially the same as that of the fourth embodiment, and thus will not be described in detail.
The difference is that: in this embodiment, the actuator control module 23 further includes: and a fourth comparison circuit U8. Wherein a first input terminal of the fourth comparison circuit U8 is connected to the output terminal of the first sampling unit 2111 for receiving the first sampling signal, and a second input terminal of the fourth comparison circuit U8 receives the fourth reference voltage V CCOFF2 The enable end of the fourth comparison circuit U8 receives a non-signal of the enable signal, and the output end of the fourth comparison circuit U8 outputs an actuator driving signal. That is, in the present embodiment, the actuator driving signal received by the third driver 231 is based on the first sampling signal and the fourth reference voltage V by the fourth comparing circuit U8 CCOFF2 Is provided after the comparison of (a).
Further, in the present embodiment, the fourth reference voltage V CCOFF2 The voltage value of (2) is smaller than the second reference voltage V CCOFF1 And a fourth reference voltage V CCOFF2 Is greater than the voltage value of the first reference voltage.
Specifically, in the present embodiment, the voltage values of the first output signal Vo1 in the first mode and the second mode of the multi-output power supply circuit are the same as those of the fourth embodiment.
Further, in the multi-output power circuit of the present embodiment, in the second mode, after the voltage value of the first output signal Vo1 reaches the set value (e.g. 17V), the fourth comparison circuit U8 provides the actuator driving signal to drive the external actuator 30 to complete one execution, and simultaneously stores the current for driving the actuator 30 on the second output capacitor C2 for the control unit 40. In this embodiment, the actuator 30 can be automatically driven to work when the voltage value of the first output signal Vo1 meets the driving voltage of the external actuator 30, without additional driving signals and interfaces, and the circuit structure is optimized.
It will be appreciated that the recitation of values herein are merely exemplary, and that other values are merely exemplary, and that the present invention is not limited to the specific values as may be substituted or otherwise desired.
Further, the invention also discloses a control method of the multi-output power supply circuit, which is suitable for the multi-output power supply circuit shown in fig. 2-8. As shown in fig. 9, the control method includes executing steps S01 to S02.
In step S01, the input voltage is converted by selecting a corresponding reference voltage and sampling signal according to an operation mode of the multi-output power supply circuit, so as to generate a first output signal having a first voltage value in a first mode of the multi-output power supply circuit, and generate a first output signal having a second voltage value in a second mode of the multi-output power supply circuit.
In one embodiment of the present invention, step S01 further comprises: a first output end of the sampling multi-output power supply circuit obtains a first sampling signal representing a first output signal; in a first mode of the multi-output power supply circuit, selecting a first reference voltage and converting an input voltage based on the first reference voltage and a first sampling signal to generate a first output signal having a first voltage value; in a second mode of the multi-output power supply circuit, a second reference voltage is selected and the input voltage is converted based on the second reference voltage and the first sampling signal to generate a first output signal having a second voltage value. Wherein the first reference voltage is less than the second reference voltage.
In another embodiment of the present invention, step S01 further includes: a first output end of the sampling multi-output power supply circuit obtains a first sampling signal and a second sampling signal representing a first output signal, and the first sampling signal is smaller than the second sampling signal; in a first mode of the multi-output power supply circuit, selecting a second sampling signal, converting the input voltage based on a second reference voltage and the second sampling signal to generate a first output signal having a first voltage value; in a second mode of the multi-output power supply circuit, the first sampling signal is selected, and the input voltage is converted based on the second reference voltage and the first sampling signal to generate a first output signal having a second voltage value.
The specific method may be understood by referring to the working principle of the first voltage conversion module 21 in the foregoing embodiments, and will not be described in detail herein.
In step S02, the first output signal is converted based on the third reference voltage and the third sampling signal, generating a second output signal. In this embodiment, the specific implementation method of step S02 can be understood by referring to the working principle of the second voltage conversion module 22 in the foregoing embodiments, which is not described in detail herein.
Further, after generating the first output signal having the second voltage value, the control method further includes: and providing an actuator driving signal and driving an external actuator based on the first output signal with the second voltage value, wherein when the first output signal with the second voltage value drives the actuator, the actuator and the second output end of the multi-output power circuit form an electric path, so that the current for driving the actuator is transmitted to the energy storage capacitor of the second output end. In this embodiment, the actuator driving signal may be input from the driving signal input terminal DRV1 of the multi-output power circuit, or may be generated inside the multi-output power circuit (for example, generated by the fourth comparing circuit U8 based on the comparison of the first sampling signal and the fourth reference voltage). The operation of the actuator control module 23 in the fourth embodiment and the fifth embodiment is specifically understood with reference to the foregoing description, and will not be described in detail herein.
In summary, in the process of converting the input voltage based on the reference voltage and the sampling signal to generate the first output signal, the invention selects different reference voltages and sampling signals to generate the first output signal with different voltage values in different working modes (including a first mode and a second mode, for example, a standby mode, and a second mode, for example, a non-standby mode) of the multi-output power supply circuit, so that the voltage value of the first output signal in the first mode is smaller than the voltage value in the second mode, and the voltage difference between two output ends of the multi-output power supply circuit can be reduced in the first mode, thereby avoiding the heating and unnecessary power loss of the low-voltage power tube caused by larger voltage drop between the two output ends in the first mode.
On the other hand, since the voltage value of the first output signal in the first mode is reduced compared with that in the second mode, the voltage value of the input voltage for charging the first capacitor at the first output end is also reduced (as long as the first capacitor can be fully charged), so that the loss of the high-voltage power tube (i.e. the first switching tube) between the voltage input end and the first output end is not increased in the first mode.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims (16)

1. A multiple output power supply circuit, comprising:
a first voltage conversion module for receiving an input voltage, and converting the input voltage according to a sampling signal and a reference voltage selected by an operation mode of a multi-output power supply circuit, so as to generate a first output signal with a first voltage value in a first mode of the multi-output power supply circuit, and generate a first output signal with a second voltage value in a second mode of the multi-output power supply circuit;
the second voltage conversion module is connected with the first voltage conversion module, and is used for receiving the first output signal and converting the first output signal according to a third reference voltage and a third sampling signal to generate a second output signal;
Wherein the first voltage value is smaller than the second voltage value such that a difference between the first output signal and the second output signal in the first mode is smaller than a difference between the first output signal and the second output signal in the second mode.
2. The multi-output power supply circuit of claim 1, wherein the first voltage conversion module comprises:
the first control unit is connected with a first output end of the multi-output power supply circuit, generates a sampling signal, receives an enabling signal corresponding to the working mode of the multi-output power supply circuit, and is used for generating a first driving control signal according to the sampling signal, the enabling signal and the reference voltage;
and the first voltage conversion unit is used for receiving the input voltage and the first driving control signal and converting the input voltage according to the first driving control signal so as to output the first output signal.
3. The multi-output power supply circuit according to claim 2, wherein the first control unit includes:
the first sampling unit is connected with a first output end of the multi-output power supply circuit and is used for sampling the voltage value of the first output signal and generating a first sampling signal;
A selection unit that receives the first sampling signal and the enable signal and selects a reference voltage according to the enable signal;
in the first mode, the selection unit selects a first reference voltage and the first sampling signal to compare, and in the second mode, the selection unit selects a second reference voltage and the first sampling signal to compare, and generates a first control signal according to a comparison result;
wherein the first reference voltage is less than the second reference voltage.
4. The multi-output power supply circuit according to claim 3, wherein,
the selection unit includes:
a first input end of the first comparison circuit receives the first sampling signal, a second input end of the first comparison circuit receives a first reference voltage, and an enabling end of the first comparison circuit receives the enabling signal;
a second comparing circuit, wherein a first input end receives the first sampling signal, and a second input end of the second comparing circuit receives a second reference voltage; the enabling end of the second comparison circuit receives a non-signal of the enabling signal;
the first input end of the OR logic circuit is connected with the output end of the first comparison circuit, the second input end of the OR logic circuit is connected with the output end of the second comparison circuit, and the output end of the OR logic circuit outputs the first control signal.
5. The multi-output power supply circuit according to claim 3, wherein,
the selection unit includes:
a first input end of the selection switch receives a second reference voltage, a second input end of the selection switch receives the first reference voltage, and a control end of the selection switch receives the enabling signal;
and the first input end of the third comparison circuit receives the first sampling signal, the second input end of the third comparison circuit is connected with the output end of the selection switch, and the output end of the third comparison circuit outputs the first control signal.
6. The multi-output power supply circuit according to claim 2, wherein the first control unit includes:
the first sampling unit is connected with a first output end of the multi-output power supply circuit; sampling the voltage value of the first output signal and generating a first sampling signal and a second sampling signal, wherein the first sampling signal is smaller than the second sampling signal;
a selection unit for receiving the enable signal and the second reference voltage and selecting a sampling signal according to the enable signal;
in the first mode, the selection unit selects the second sampling signal and the second reference voltage for comparison, and in the second mode, the selection unit selects the first sampling signal and the second reference voltage for comparison, and generates a first control signal according to a comparison result.
7. The multi-output power supply circuit according to claim 3 or 6, wherein the first control unit further comprises:
the charging unit is used for receiving the input voltage of the multi-output power supply circuit, judging whether the voltage value of the input voltage is in a preset range or not, and generating a second control signal according to a judging result;
and the logic circuit is used for receiving the first control signal and the second control signal and generating the first driving control signal according to the first control signal and the second control signal, wherein the first driving control signal is used for controlling the connection or disconnection between the voltage input end and the first output end of the multi-output power supply circuit.
8. The multi-output power supply circuit according to claim 2, wherein a mode control signal input from a mode control signal input terminal of the multi-output power supply circuit is used as the enable signal; or alternatively
The first voltage conversion module further includes:
and the mode detection unit is connected with the mode control signal input end to receive the mode control signal and is used for outputting an enabling signal corresponding to the working mode of the multi-output power supply circuit according to the mode control signal.
9. A multi-output power supply circuit according to claim 3 wherein the second voltage conversion module comprises:
the second sampling unit is connected with a second output end of the multi-output power supply circuit, and is used for receiving a second output signal, sampling the voltage value of the second output signal and generating a third sampling signal;
the differential amplifying circuit is used for generating an error amplifying signal according to the third reference voltage and the third sampling signal;
a second voltage conversion unit converting the first output signal according to the error amplification signal to generate a second output signal;
wherein the sampling coefficient of the third sampling signal is the same as the sampling coefficient of the first sampling signal.
10. The multi-output power supply circuit of claim 9 wherein the selection unit comprises an addition circuit,
the first input end of the adding circuit receives the third reference voltage, the second input end receives a bias voltage, and the adding circuit performs addition operation to obtain the first reference voltage;
or the first input end of the adding circuit receives the third reference voltage, the second input end receives the error amplification signal, and the adding operation is performed to obtain the first reference voltage.
11. The multi-output power supply circuit according to claim 3 or 6, wherein the multi-output power supply circuit further comprises:
an actuator control module for receiving the first output signal and an actuator driving signal, for switching on or off a driving path of the first output signal having a second voltage value to an external actuator according to the actuator driving signal,
when the first output signal with the second voltage value drives the actuating mechanism, the actuating mechanism and the second output end of the multi-output power supply circuit form an electric path, so that the current for driving the actuating mechanism is transmitted to the energy storage capacitor of the second output end.
12. The multi-output power supply circuit of claim 11 wherein,
the actuator control module includes:
the cathode of the diode is connected with the first output end of the multi-output power supply circuit, and the anode of the diode is connected with the executing mechanism;
the third driver is used for receiving the actuating mechanism driving signal and generating a third driving signal according to the level state of the actuating mechanism driving signal;
and the control end of the third switching tube receives the third driving signal.
13. The multiple output power circuit of claim 11, wherein the actuator drive signal is input by an actuator drive signal input of the multiple output power circuit; or alternatively
The actuator control module further includes:
the first input end of the fourth comparison circuit is connected with the first sampling unit to receive a first sampling signal, the second input end of the fourth comparison circuit receives a fourth reference voltage, the enabling end of the fourth comparison circuit receives a non-signal of the enabling signal, and the output end of the fourth comparison circuit outputs the actuating mechanism driving signal;
wherein the fourth reference voltage is less than the second reference voltage and greater than the first reference voltage.
14. A control method of a multi-output power supply circuit, wherein the control method comprises:
selecting a reference voltage and a sampling signal according to an operation mode of the multi-output power supply circuit to convert the input voltage to generate a first output signal having a first voltage value in a first mode of the multi-output power supply circuit and to generate a first output signal having a second voltage value in a second mode of the multi-output power supply circuit;
converting the first output signal based on a third reference voltage and a third sampling signal, generating a second output signal,
Wherein the first voltage value is smaller than the second voltage value such that a difference between the first output signal and the second output signal in the first mode is smaller than a difference between the first output signal and the second output signal in the second mode.
15. The control method according to claim 14, wherein further comprising:
sampling a first output end of the multi-output power supply circuit to obtain a first sampling signal representing the first output signal;
in a first mode of the multi-output power supply circuit, selecting a first reference voltage and converting an input voltage based on the first reference voltage and a first sampling signal to generate a first output signal having a first voltage value;
in a second mode of the multi-output power supply circuit, selecting a second reference voltage and converting an input voltage based on the second reference voltage and a first sampling signal to generate a first output signal having a second voltage value;
wherein the first reference voltage is less than the second reference voltage.
16. The control method according to claim 14, wherein further comprising:
sampling a first output end of the multi-output power supply circuit to obtain a first sampling signal and a second sampling signal representing the first output signal, wherein the first sampling signal is smaller than the second sampling signal;
Selecting a second sampling signal in a first mode of the multi-output power supply circuit, and converting an input voltage based on a second reference voltage and the second sampling signal to generate a first output signal having a first voltage value;
in a second mode of the multi-output power supply circuit, a first sampling signal is selected and an input voltage is converted based on a second reference voltage and the first sampling signal to generate a first output signal having a second voltage value.
CN202110923397.1A 2021-08-12 2021-08-12 Multi-output power supply circuit and control method thereof Active CN114094823B (en)

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