CN214674895U - Switch linear composite power supply - Google Patents
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- CN214674895U CN214674895U CN202120514659.4U CN202120514659U CN214674895U CN 214674895 U CN214674895 U CN 214674895U CN 202120514659 U CN202120514659 U CN 202120514659U CN 214674895 U CN214674895 U CN 214674895U
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Abstract
The utility model provides a switch linear composite power supply in the technical field of power supply equipment, which comprises a control module, a DC-DC power supply module, a linear adjusting module and a detection module; the output end of the DC-DC power supply module is connected with the input end of the linear adjusting module; the input end of the detection module is connected with the DC-DC power supply module and the linear adjustment module, and the output end of the detection module is connected with the control module; the control module is connected with the DC-DC power supply module and the linear adjusting module. The utility model has the advantages that: the thermal stability, the output precision, work efficiency and application scope of power have very big promotion.
Description
Technical Field
The utility model relates to a power supply unit technical field indicates a switch linear composite power supply very much.
Background
A Switching Mode Power Supply (SMPS), also called as a switching Power Supply (SMPS), is a high-frequency Power conversion device, which is a Power Supply and functions to convert a voltage of one level into a voltage or a current required by a user terminal through different types of architectures. The Linear power supply (Linear power supply) is to reduce the voltage amplitude of the alternating current through a transformer, obtain pulse direct current after the alternating current is rectified by a rectifying circuit, and obtain direct current voltage with micro-ripple voltage after the pulse direct current is filtered.
Aiming at a direct current voltage stabilization source, the switching power supply has the advantages of low power consumption and high efficiency, but has the defects of poor output precision and slow response caused by large influence of electromagnetic interference and large ripple factor; the linear power supply is less affected by electromagnetic interference and has stable output, but has the defects of lower working efficiency and poor thermal stability. Namely, the switching power supply and the linear power supply have respective advantages and disadvantages, and the bus voltage Vbus of the conventional switching power supply and linear power supply is a fixed output, so that the application range is limited.
Therefore, how to provide a switching linear hybrid power supply to improve the thermal stability, the output accuracy, the working efficiency and the application range of the power supply becomes a problem to be solved urgently.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in providing a switch linear composite power supply, realizes heat stability, output precision, work efficiency and application scope that promote the power.
The utility model provides a switch linear composite power supply, which comprises a control module, a DC-DC power supply module, a linear adjusting module and a detection module;
the output end of the DC-DC power supply module is connected with the input end of the linear adjusting module; the input end of the detection module is connected with the DC-DC power supply module and the linear adjustment module, and the output end of the detection module is connected with the control module; the control module is connected with the DC-DC power supply module and the linear adjusting module.
Furthermore, the control module comprises an MCU, a hardware multiplier, a digital-to-analog converter and a communication interface group;
one end of the hardware multiplier is connected with the MCU, and the other end of the hardware multiplier is connected with the detection module; one end of the digital-to-analog converter is connected with the MCU, and the other end of the digital-to-analog converter is connected with the linear adjusting module; the MCU is respectively connected with the communication interface group and the detection module;
the communication interface group comprises an SPI interface, a UART interface, an IIC interface and an Ethernet interface.
Further, the DC-DC power module includes a filter circuit and a switching regulator circuit;
the switch adjusting circuit is respectively connected with the filter circuit, the linear adjusting module, the control module and the detection module.
Further, the filter circuit includes a capacitor C1, a capacitor C2, an inductor L1, and an inductor L2;
one end of the inductor L1 is connected with a capacitor C1, and the other end of the inductor L1 is connected with the capacitor C2 and a switch adjusting circuit; one end of the inductor L2 is connected with a capacitor C1, and the other end of the inductor L2 is connected with the capacitor C2 and a switch adjusting circuit;
the switch adjusting circuit comprises a capacitor C3, a capacitor C4, a diode D1, an inductor L3 and a MOS transistor Q1;
a D pole of the MOS transistor Q1 is connected with a capacitor C3, a capacitor C2 and an inductor L1, an S pole is connected with an output end of the inductor L3 and an output end of a diode D1, and a G pole is connected with the control module; one end of the capacitor C4 is connected to the inductor L3 and the linear adjustment module, and the other end is connected to the input end of the diode D1, the capacitor C3, the capacitor C2, the inductor L2, and the linear adjustment module.
Further, the linear adjustment module includes a capacitor C5, a capacitor C6, and a MOS transistor Q2;
the D pole of the MOS tube Q2 is connected with a capacitor C5, a DC-DC power supply module and a detection module, the S pole is connected with the capacitor C6 and the detection module, and the G pole is connected with the control module; the capacitor C5 is connected with the capacitor C6 and the DC-DC power supply module.
Furthermore, the detection module comprises a current detection circuit, a linear voltage difference detection circuit, an output voltage detection circuit, a temperature detection circuit and a bus voltage detection circuit;
the input end of the current detection circuit is connected with the output end of the DC-DC power supply module, and the output end of the current detection circuit is connected with the control module; the input end of the linear differential pressure detection circuit is connected with the input end and the output end of the linear adjusting module, and the output end of the linear differential pressure detection circuit is connected with the control module; the input end of the output voltage detection circuit is connected with the output end of the linear adjustment module, and the output end of the output voltage detection circuit is connected with the control module; the input end of the temperature detection circuit is connected with the linear adjustment module, and the output end of the temperature detection circuit is connected with the control module; the input end of the bus voltage detection circuit is connected with the output end of the DC-DC power supply module, and the output end of the bus voltage detection circuit is connected with the control module.
The utility model has the advantages that:
1. the detection module comprises a current detection circuit, a linear voltage difference detection circuit, an output voltage detection circuit, a temperature detection circuit and a bus voltage detection circuit, and is used for detecting the input current Isensor of the linear adjustment module in real time, the linear voltage difference Vmos of the MOS tube Q2, the output voltage Vout of the linear adjustment module, the temperature Tmos at two ends of the MOS tube Q2 and the bus voltage Vbus output by the switch adjustment circuit, so that the MCU can adjust the duty ratio of a pulse width modulation signal of the MOS tube Q1 in real time based on detected data, namely, the bus voltage Vbus set is adjusted to reduce power loss, the working efficiency of the power supply is greatly improved, and the thermal stability of the power supply is greatly improved.
2. The loading voltage Vset and the loading current Iset received by the MCU are transmitted to the linear adjustment module through the digital-to-analog converter, so that the output of the linear adjustment module is accurately controlled, and the output precision of the power supply is greatly improved.
3. Bus voltage Vbus set is calculated through voltage drop of the mos tube Q2 and the maximum output voltage Vmax of the battery to be tested, and then the output of the mos tube Q1 is set based on the calculated bus voltage Vbus set, so that dynamic adjustment of the bus voltage is achieved, the application range of the power supply is greatly widened, and the adaptability is improved.
4. The temperature Tmos, the output voltage Vout and the input current Isensor are respectively and safely monitored through the MCU based on the temperature threshold, the voltage threshold and the current threshold, and when the temperature Tmos, the output of the switching linear composite power supply is immediately turned off when the temperature Tmos, the output of the switching linear composite power supply and the current threshold exceed the threshold, so that the safety is greatly improved.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic circuit block diagram of a switching linear hybrid power supply according to the present invention.
Fig. 2 is a schematic block diagram of the circuit of the detection module of the present invention.
Fig. 3 is a circuit diagram of the DC-DC power module and the linear adjustment module of the present invention.
Fig. 4 is a flow chart of the working principle of the present invention.
Description of the labeling:
100-a switch linear composite power supply, 1-a control module, 2-DC-DC power supply module, 3-a linear regulation module, 4-a detection module, 21-a filter circuit, 22-a switch regulation circuit, 11-MCU, 12-a hardware multiplier, 13-a/d converter, 14-a communication interface group, 141-SPI interface, 142-UART interface, 143-IIC interface, 144-Ethernet interface, 41-current detection circuit, 42-a linear voltage difference detection circuit, 43-output voltage detection circuit, 44-temperature detection circuit, 45-bus voltage detection circuit.
Detailed Description
The technical scheme in the embodiment of the application has the following general idea: by setting the detection module 4 to detect the input current Isensor of the linear adjustment module 3, the linear voltage difference Vmos of the MOS transistor Q2, the output voltage Vout of the linear adjustment module 3, the temperature Tmos at two ends of the MOS transistor Q2, and the bus voltage Vbus output by the switch adjustment circuit 22 in real time, the MCU11 can adjust the duty ratio of the pulse width modulation signal of the MOS transistor Q1 in real time based on the detected data, that is, adjust the bus voltage Vbusset to reduce the power loss, so as to improve the working efficiency and thermal stability of the power supply; the loading voltage Vset and the loading current Iset received by the MCU11 are transmitted to the linear adjustment module 3 by the digital-to-analog converter 13, so as to accurately control the output of the linear adjustment module 3, thereby improving the output accuracy of the power supply; bus voltage Vbus set is calculated through voltage drop of the mos tube Q2 and the maximum output voltage Vmax of the battery to be tested, and then the output of the mos tube Q1 is set based on the calculated bus voltage Vbus set, namely, the bus voltage is dynamically adjusted, so that the application range of the power supply is widened.
Referring to fig. 1 to 4, a preferred embodiment of a switching linear hybrid power supply 100 of the present invention includes a control module 1, a DC-DC power module 2, a linear adjustment module 3, and a detection module 4; the control module 1 is used for controlling the operation of the switching linear composite power supply 100; the DC-DC power supply module 2 is used for adjusting fixed direct-current voltage into variable direct-current voltage; the linear adjusting module 3 is used for accurately adjusting the output of the DC-DC power supply module 2, so that the input voltage and current reach the required values and accuracy; the detection module 4 is configured to collect an input current Isensor of the linear adjustment module 3, a linear voltage difference Vmos of the MOS transistor Q2, an output voltage Vout of the linear adjustment module 3, a temperature Tmos at two ends of the MOS transistor Q2, and a bus voltage Vbus output by the switch adjustment circuit 22, and further perform system self-check and closed-loop control, that is, convert various analog signals into digital signals and transmit the digital signals to the MCU 11;
the output end of the DC-DC power supply module 2 is connected with the input end of the linear adjusting module 3; the input end of the detection module 4 is connected with the DC-DC power supply module 2 and the linear adjustment module 3, and the output end of the detection module is connected with the control module 1; the control module 1 is connected with a DC-DC power supply module 2 and a linear adjusting module 3.
The control module 1 comprises an MCU11, a hardware multiplier 12, a digital-to-analog converter 13, and a communication interface group 14; the digital-to-analog converter 13 is used for accurately controlling the output of the linear adjustment module 3; the hardware multiplier 12 is configured to multiply detection results of the current detection circuit 41 and the linear voltage difference detection circuit 42 to obtain a power loss Pmos of the MOS transistor Q2; the MCU11 is used to control the operation of the switching linear hybrid power supply 100, and in specific implementation, it is only necessary to select an MCU capable of implementing this function from the prior art, and the model is not limited to any model, such as the MCU of the ST 32F103 series from ST corporation, and the control program is well known to those skilled in the art, and this is available to those skilled in the art without creative effort;
one end of the hardware multiplier 12 is connected with the MCU11, and the other end is connected with the detection module 4; one end of the digital-to-analog converter 13 is connected with the MCU11, and the other end is connected with the linear adjustment module 3; the MCU11 is respectively connected with the communication interface group 14 and the detection module 4;
the communication interface set 14 includes an SPI interface 141, a UART interface 142, an IIC interface 143, and an ethernet interface 144; the SPI interface 141, the UART interface 142, the IIC interface 143, and the ethernet interface 144 are all connected to the MCU 11.
The DC-DC power module 2 includes a filter circuit 21 and a switch adjusting circuit 22; the filter circuit 21 is used for removing high-frequency clutter and interference signals;
the switch adjusting circuit 22 is respectively connected to the filter circuit 21, the linear adjusting module 3, the control module 1 and the detecting module 4.
The filter circuit 21 includes a capacitor C1, a capacitor C2, an inductor L1, and an inductor L2;
one end of the inductor L1 is connected to a capacitor C1, and the other end is connected to the capacitor C2 and the switch adjusting circuit 22; one end of the inductor L2 is connected to a capacitor C1, and the other end is connected to the capacitor C2 and the switch adjusting circuit 22;
the switch adjustment circuit 22 includes a capacitor C3, a capacitor C4, a diode D1, an inductor L3, and a MOS transistor Q1; the switching linear composite power supply 100 can output variable voltage and current by adjusting the conduction time of the MOS tube Q1;
a D pole (drain) of the MOS transistor Q1 is connected to a capacitor C3, a capacitor C2 and an inductor L1, an S pole (source) is connected to the inductor L3 and an output end of a diode D1, and a G pole (gate) is connected to the control module 1; one end of the capacitor C4 is connected to the inductor L3 and the linear adjustment module 3, and the other end is connected to the input end of the diode D1, the capacitor C3, the capacitor C2, the inductor L2, and the linear adjustment module 3.
The linear adjustment module 3 includes a capacitor C5, a capacitor C6, and a MOS transistor Q2; the MOS tube Q2 is used for protecting the circuit and adjusting the constant voltage and constant current precision;
the D pole of the MOS transistor Q2 is connected with a capacitor C5, the DC-DC power supply module 2 and the temperature detection circuit 41 of the detection module 4, the S pole is connected with the capacitor C6 and the temperature detection circuit 41 of the detection module 4, and the G pole is connected with the digital-to-analog converter 13 of the control module 1; the capacitor C5 is connected with the capacitor C6 and the DC-DC power module 2.
The detection module 4 includes a current detection circuit 41, a linear voltage difference detection circuit 42, an output voltage detection circuit 43, a temperature detection circuit 44 and a bus voltage detection circuit 45;
the input end of the current detection circuit 41 is connected with the output end of the DC-DC power supply module 2, and the output end is connected with the hardware multiplier 12 and the MCU11 of the control module 1; the input end of the linear differential pressure detection circuit 42 is connected with the input end and the output end of the linear adjustment module 3, and the output end is connected with the hardware multiplier 12 and the MCU11 of the control module 1; the input end of the output voltage detection circuit 43 is connected with the output end of the linear adjustment module 3, and the output end is connected with the control module 1; the input end of the temperature detection circuit 44 is connected with the linear adjustment module 3, and the output end is connected with the control module 1; the input end of the bus voltage detection circuit 45 is connected with the output end of the DC-DC power supply module 2, and the output end is connected with the control module 1.
The working principle of the utility model comprises the following steps:
step S10, the MCU receives the power supply parameter sent by the upper computer through the communication interface group; the power supply parameters comprise loading voltage Vset, loading current Iset, voltage drop of a mos tube Q2, maximum output voltage Vmax of the battery to be tested, lower power limit of the mos tube, upper power limit of the mos tube, temperature threshold, voltage threshold and current threshold;
step S20, the filter circuit inputs the filtered DC voltage-stabilizing source into the switch adjusting circuit;
step S30, the MCU calculates bus voltage Vbus set based on the voltage drop of the MOS tube Q2 and the maximum output voltage Vmax of the battery to be tested, and outputs a corresponding pulse width modulation signal (PWM) to the MOS tube Q1 based on the bus voltage Vbus set, namely, the conduction time of the MOS tube Q1 is controlled, so that the MOS tube Q1 outputs a modulated power supply to the linear adjustment module;
step S40, the MCU sends the loading voltage Vset and the loading current Iset to the linear modulation module through the digital-to-analog converter, and the linear modulation module linearly adjusts the input power based on the received loading voltage Vset and the loading current Iset, i.e. the input voltage and current reach the required values and precision;
step S50, the detection module detects the input current Isensor of the linear adjustment module, the linear voltage difference Vmos of the MOS transistor Q2, the output voltage Vout of the linear adjustment module, the temperature Tmos at two ends of the MOS transistor Q2, and the bus voltage Vbus output by the switching adjustment circuit;
step S60, the MCU calculates to obtain the power loss Pmos of the MOS tube Q2 based on the input current Isensor, the linear voltage difference Vmos, the output voltage Vout and the bus voltage Vbus, and adjusts the pulse width modulation signal of the MOS tube Q1 based on the power loss Pmos, the MOS tube power lower limit and the MOS tube power upper limit; the bus voltage Vbauset is a set value of the bus voltage, the bus voltage Vbus is an actual measured value of the bus voltage, and the initial state of the Vbauset is full-amplitude output so as to shorten the time of a voltage and current rising edge;
and step S70, the MCU respectively monitors the temperature Tmos, the output voltage Vout and the input current Isensor based on the temperature threshold, the voltage threshold and the current threshold.
In step S30, the calculation formula of the bus voltage is:
vbusset ═ mos tube Q2 pressure drop + Vmax.
For example, the voltage drop of the mos tube Q2 is 3V, the maximum output voltage of the battery to be tested is 15V, and the bus voltage Vbusset is 18V.
The step S60 specifically includes:
step S61, calculating, by the MCU based on the hardware multiplier, the power loss Pmos of the MOS transistor Q2 by using the input current Isensor and the linear voltage difference Vmos:
Pmos＝Vmos*Isensor；
or calculating the power loss Pmos of the MOS transistor Q2 by using the input current Isensor, the output voltage Vout and the bus voltage Vbus:
Pmos＝(Vout-Vbus)*Isensor；
the MCU can calculate Pmos by itself or obtain the calculation result of Pmos directly through a hardware multiplier;
step S62, the MCU judges whether the power loss Pmos is smaller than the lower limit of the MOS tube power, if yes, the duty ratio of the pulse width modulation signal of the MOS tube Q1 is adjusted up; if not, go to step S63;
step S63, the MCU judges whether the power loss Pmos is larger than the MOS tube power upper limit, if so, the duty ratio of the pulse width modulation signal of the MOS tube Q1 is adjusted downwards; if not, the process proceeds to step S70.
The step S70 specifically includes:
the MCU judges whether the temperature Tmos is greater than a temperature threshold value, whether the output voltage Vout is greater than a voltage threshold value or not, or whether the input current Isensor is greater than a current threshold value or not, if yes, the output of the switching linear composite power supply is closed; if not, continuing monitoring.
To sum up, the utility model has the advantages that:
1. the detection module comprises a current detection circuit, a linear voltage difference detection circuit, an output voltage detection circuit, a temperature detection circuit and a bus voltage detection circuit, and is used for detecting the input current Isensor of the linear adjustment module in real time, the linear voltage difference Vmos of the MOS tube Q2, the output voltage Vout of the linear adjustment module, the temperature Tmos at two ends of the MOS tube Q2 and the bus voltage Vbus output by the switch adjustment circuit, so that the MCU can adjust the duty ratio of a pulse width modulation signal of the MOS tube Q1 in real time based on detected data, namely, the bus voltage Vbus set is adjusted to reduce power loss, the working efficiency of the power supply is greatly improved, and the thermal stability of the power supply is greatly improved.
2. The loading voltage Vset and the loading current Iset received by the MCU are transmitted to the linear adjustment module through the digital-to-analog converter, so that the output of the linear adjustment module is accurately controlled, and the output precision of the power supply is greatly improved.
3. Bus voltage Vbus set is calculated through voltage drop of the mos tube Q2 and the maximum output voltage Vmax of the battery to be tested, and then the output of the mos tube Q1 is set based on the calculated bus voltage Vbus set, so that dynamic adjustment of the bus voltage is achieved, the application range of the power supply is greatly widened, and the adaptability is improved.
4. The temperature Tmos, the output voltage Vout and the input current Isensor are respectively and safely monitored through the MCU based on the temperature threshold, the voltage threshold and the current threshold, and when the temperature Tmos, the output of the switching linear composite power supply is immediately turned off when the temperature Tmos, the output of the switching linear composite power supply and the current threshold exceed the threshold, so that the safety is greatly improved.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (6)
1. A switched linear hybrid power supply, characterized by: comprises a control module, a DC-DC power module, a linear adjustment module and a detection module;
the output end of the DC-DC power supply module is connected with the input end of the linear adjusting module; the input end of the detection module is connected with the DC-DC power supply module and the linear adjustment module, and the output end of the detection module is connected with the control module; the control module is connected with the DC-DC power supply module and the linear adjusting module.
2. A switched linear hybrid power supply as claimed in claim 1, characterized in that: the control module comprises an MCU, a hardware multiplier, a digital-to-analog converter and a communication interface group;
one end of the hardware multiplier is connected with the MCU, and the other end of the hardware multiplier is connected with the detection module; one end of the digital-to-analog converter is connected with the MCU, and the other end of the digital-to-analog converter is connected with the linear adjusting module; the MCU is respectively connected with the communication interface group and the detection module;
the communication interface group comprises an SPI interface, a UART interface, an IIC interface and an Ethernet interface.
3. A switched linear hybrid power supply as claimed in claim 1, characterized in that: the DC-DC power supply module comprises a filter circuit and a switch adjusting circuit;
the switch adjusting circuit is respectively connected with the filter circuit, the linear adjusting module, the control module and the detection module.
4. A switched linear hybrid power supply as claimed in claim 3, characterized in that: the filter circuit comprises a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2;
one end of the inductor L1 is connected with a capacitor C1, and the other end of the inductor L1 is connected with the capacitor C2 and a switch adjusting circuit; one end of the inductor L2 is connected with a capacitor C1, and the other end of the inductor L2 is connected with the capacitor C2 and a switch adjusting circuit;
the switch adjusting circuit comprises a capacitor C3, a capacitor C4, a diode D1, an inductor L3 and a MOS transistor Q1;
a D pole of the MOS transistor Q1 is connected with a capacitor C3, a capacitor C2 and an inductor L1, an S pole is connected with an output end of the inductor L3 and an output end of a diode D1, and a G pole is connected with the control module; one end of the capacitor C4 is connected to the inductor L3 and the linear adjustment module, and the other end is connected to the input end of the diode D1, the capacitor C3, the capacitor C2, the inductor L2, and the linear adjustment module.
5. A switched linear hybrid power supply as claimed in claim 1, characterized in that: the linear adjustment module comprises a capacitor C5, a capacitor C6 and a MOS transistor Q2;
the D pole of the MOS tube Q2 is connected with a capacitor C5, a DC-DC power supply module and a detection module, the S pole is connected with the capacitor C6 and the detection module, and the G pole is connected with the control module; the capacitor C5 is connected with the capacitor C6 and the DC-DC power supply module.
6. A switched linear hybrid power supply as claimed in claim 1, characterized in that: the detection module comprises a current detection circuit, a linear voltage difference detection circuit, an output voltage detection circuit, a temperature detection circuit and a bus voltage detection circuit;
the input end of the current detection circuit is connected with the output end of the DC-DC power supply module, and the output end of the current detection circuit is connected with the control module; the input end of the linear differential pressure detection circuit is connected with the input end and the output end of the linear adjusting module, and the output end of the linear differential pressure detection circuit is connected with the control module; the input end of the output voltage detection circuit is connected with the output end of the linear adjustment module, and the output end of the output voltage detection circuit is connected with the control module; the input end of the temperature detection circuit is connected with the linear adjustment module, and the output end of the temperature detection circuit is connected with the control module; the input end of the bus voltage detection circuit is connected with the output end of the DC-DC power supply module, and the output end of the bus voltage detection circuit is connected with the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120514659.4U CN214674895U (en) | 2021-03-11 | 2021-03-11 | Switch linear composite power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120514659.4U CN214674895U (en) | 2021-03-11 | 2021-03-11 | Switch linear composite power supply |
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| CN214674895U true CN214674895U (en) | 2021-11-09 |
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| CN202120514659.4U Active CN214674895U (en) | 2021-03-11 | 2021-03-11 | Switch linear composite power supply |
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