CN112928910A - Voltage-regulating output switch power supply - Google Patents

Voltage-regulating output switch power supply Download PDF

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Publication number
CN112928910A
CN112928910A CN202110172903.8A CN202110172903A CN112928910A CN 112928910 A CN112928910 A CN 112928910A CN 202110172903 A CN202110172903 A CN 202110172903A CN 112928910 A CN112928910 A CN 112928910A
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voltage
switch
output
converter
resistor
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CN112928910B (en
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蔡婧璐
邹锦浪
蓝兴盛
徐正军
张智芳
段永辉
王新征
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Shanghai Institute of Space Power Sources
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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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

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  • Power Engineering (AREA)
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Abstract

The invention provides a voltage-regulating output switch power supply, which comprises a DC/DC converter main circuit, a switch tube driving signal control circuit and a relay switch circuit for controlling voltage-regulating output; the DC/DC converter main circuit comprises a DC/DC converter and a voltage division sampling resistor; the switching tube driving signal control circuit is used for sending a driving signal to control the switching on and switching off of a switching tube of the DC/DC converter; the relay switch circuit comprises a plurality of relay switches and a plurality of gear shifting resistors, and the gear shifting resistors and the voltage dividing sampling resistor realize different series-parallel relations by controlling the switch states of the relay switches, so that the main circuit of the DC/DC converter has different output voltages Vout. The invention can solve the problems of unsafe and inconvenient manual regulation of the output voltage of the switching power supply.

Description

Voltage-regulating output switch power supply
Technical Field
The invention relates to the technical field of switching power supplies, in particular to an output voltage adjustable switching power supply with a plurality of output voltage gears.
Background
The power supply plays a very important role in the modern times, and in both industrial production and daily life, higher requirements are put forward on a power supply system, such as small volume, high efficiency and the like of the power supply. Accordingly, a switching power supply technology using a power semiconductor device as a switch is in place. Compared with the traditional linear power supply, the switching power supply has the advantages of small volume, high efficiency, large output power and the like, and becomes the most widely applied power supply type at present.
For the application occasions that the sampling feedback voltage is not changed when the same power supply generates different voltage output gears, the sampling feedback voltage can be ensured to be unchanged by changing the distribution mode of the sampling voltage resistance value, but if the voltage division sampling resistor is manually replaced at the power supply feedback end every time, the process is complicated, the operability is poor, and the safety is not high.
Disclosure of Invention
The invention aims to provide a voltage-regulating output switch power supply to solve the problems of unsafety and inconvenience in manually regulating the output voltage of the switch power supply.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a voltage-regulating output switch power supply comprises a DC/DC converter main circuit, a switch tube driving signal control circuit and a relay switch circuit for controlling voltage-regulating output;
the DC/DC converter main circuit comprises a DC/DC converter and a voltage division sampling resistor;
the switching tube driving signal control circuit is used for sending a driving signal to control the switching on and switching off of a switching tube of the DC/DC converter;
the relay switch circuit comprises a plurality of relay switches and a plurality of gear shifting resistors, and the gear shifting resistors and the voltage dividing sampling resistor realize different series-parallel relations by controlling the switch states of the relay switches, so that the DC/DC converter main circuit outputs different output voltages Vout。
Furthermore, the voltage at two ends of the voltage division sampling resistor is output voltage Vout；
The voltage division sampling resistor comprises a first resistor R1And a second resistor R2Said second resistance R2The voltage at two ends is sampling feedback voltage Vfeedback。
The switching tube of the DC/DC converter is controlled to be switched on and off by the switching tube driving signal control circuit, so that the sampling feedback voltage V is stablefeedbackIs always equal to the reference voltage Vref。
Furthermore, the switching tube driving signal control circuit comprises a voltage and current double closed-loop control module and a PWM controller;
the voltage and current double closed loop control module is used for controlling the output current i of the DC/DC converterdcAnd said sampled feedback voltage VfeedbackPerforming voltage and current double closed-loop control and outputting a modulation signal;
and the PWM controller is used for processing the modulation signal to obtain the driving signal.
Furthermore, the switch tube driving signal control circuit further comprises a magnetic isolation module and/or a low-voltage locking module;
the magnetic isolation module is positioned between the voltage and current double closed-loop control module and the PWM controller and is used for carrying out magnetic isolation on the modulation signal output by the voltage and current double closed-loop control module and inputting the modulation signal subjected to magnetic isolation into the PWM controller;
the low-voltage locking module is used for locking the input voltage V of the DC/DC converterinAnd when the output voltage is lower than the preset value, locking the PWM controller and not outputting the driving signal.
Furthermore, the number of the relay switches is three, and the number of the gear shifting resistors is three;
the main circuit of the DC/DC converter has five output voltages Vout。
Furthermore, each relay switch internally comprises a first switch and a second switch, when the upper switch coil is electrified, the first switch and the second switch are both switched on, and when the lower switch coil is electrified, the first switch and the second switch are both switched on.
Further, a relay switch K1Input of the first switch and relay switch K2Is connected with the input of the first switch, and the relay switch K1The upper output of the first switch is connected with a first gear shifting resistor R3Rear and out1Connected with each other, and connected with a second gear shifting resistor R after the lower output4Rear and out1Connecting;
relay switch K1Input and out of the second switch1Connected with a relay switch K1Upper output and output voltage V of the second switchoutThe lower output is connected with GND;
relay switch K2Lower output of the first switch and relay switch K2And the input of the second switch is connected with the Adj output end of the main circuit of the DC/DC converter; wherein the Adj output terminal is located at the first resistor R1And a second resistor R2To (c) to (d);
relay switch K2The lower output of the second switch and the relay switch K3The input of the first switch is connected;
relay switch K3The lower output of the first switch is connected with a third gear shifting resistor R5Rear and out1Are connected.
Further, the main circuit of the DC/DC converter further includes a first filter capacitor CinAnd a second filter capacitor CoutAnd a load resistor RL；
The DC/DC converter is connected with the first filter capacitor C in frontinIs connected to the second filter capacitor Cout；
The load resistor RLAnd the second filter capacitor CoutAnd the voltage division sampling resistors are connected in parallel.
Compared with the prior art, the invention has the following beneficial effects:
the invention outputs the voltages of a plurality of gears by arranging and combining the switch states of a plurality of relays, and realizes the voltage boosting and reducing function on the basis of rated voltage.
The voltage-regulating output switch power supply disclosed by the invention is simple in principle, low in cost, practical, reliable and convenient to popularize, and can be applied to the condition that the output voltage is required to be variable on the basis of not changing the divided voltage feedback voltage.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are an embodiment of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts according to the drawings:
fig. 1 is a schematic structural diagram of a voltage-regulated output switching power supply according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a main circuit of the DC/DC converter;
FIG. 3 is a schematic diagram of depressurization;
FIG. 4 is a schematic of boosting;
FIG. 5 is a circuit diagram of a switch tube drive signal control circuit;
fig. 6 is a circuit diagram of a relay switch circuit that controls the regulated voltage output.
Detailed Description
The technical solution proposed by the present invention will be further described in detail with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
The invention provides a multi-gear voltage-regulating output switch power supply, and a specific voltage regulating mode is realized by cooperative control of a plurality of relays. Referring to fig. 1-6, the voltage-regulating output switching power supply includes a DC/DC converter main circuit 100, a switching tube driving signal control circuit 200, and a relay switching circuit 300 for controlling the voltage-regulating output. By controlling the arrangement and combination of the states of the plurality of relay switches in the relay switch circuit 300, the output voltages V of different gears are outputout。
The DC/DC converter main circuit 100 comprises a DC/DC converter 101 and a voltage division sampling resistor;
the switching tube driving signal control circuit 200 is configured to send a driving signal to control the switching tube of the DC/DC converter 101 to be turned on and off;
the relay switch circuit 300 includes a plurality of relay switches and a plurality of shift resistors, and the shift resistors and the voltage dividing sampling resistors realize different series-parallel relationships by controlling the switching states of the relay switches, so that the DC/DC converter main circuit 100 has different output voltages Vout。
Specifically, as shown in fig. 2, the DC/DC converter main circuit includes a DC/DC converter and a voltage-dividing sampling resistor; the input end of the DC/DC converter is connected with an input voltage VinThe output end of the voltage divider is connected with a voltage divider sampling resistor, and the voltages at the two ends of the voltage divider sampling resistor are output voltages Vout；
The voltage division sampling resistor comprises a first resistor R1And a second resistor R2Said second resistance R2The voltage at two ends is sampling feedback voltage Vfeedback。
The switching tube of the DC/DC converter is controlled to be switched on and off by the switching tube driving signal control circuit, so that the sampling feedback voltage V is stablefeedbackIs always equal to the reference voltage Vref。
As shown in FIG. 2, the voltage-dividing sampling resistor has three output terminals, each of which is VoutAdj and GND, a second resistor R2The voltage at two ends is sampling feedback voltage Vfeedback，VfeedbackRemain unchanged. If at the first resistance R1Resistor R with two parallel endsadj1Then output voltage VoutThe principle of lowering, lowering the pressure is shown in figure 3; if at the second resistance R2Resistor R with two parallel endsadj2Then output voltage VoutThe boosting principle is shown in fig. 4. Only the first resistor R1And a second resistor R2Output voltage V in series samplingoutAs shown in formula (1). As can be seen from FIG. 3, the first resistor R1And a resistor Radj1Connected in parallel with a second resistor R2Output voltage V in series samplingoutAs shown in formula (2). As can be seen from FIG. 4, the second resistor R2And a resistor Radj2Connected in parallel with a first resistor R1Output voltage V in series samplingoutAs shown in formula (3).
Figure BDA0002939329660000051
Figure BDA0002939329660000052
Figure BDA0002939329660000053
According to the formula (2), when the first resistor R is used1And a resistor Radj1Connected in parallel with a second resistor R2Output voltage V during serial samplingoutIs in a step-down mode(ii) a According to the formula (3), when the second resistor R is used2And a resistor Radj2Connected in parallel with a first resistor R1Output voltage V during serial samplingoutThe boost mode is used.
Further, the DC/DC converter main circuit 100 further includes a first filter capacitor CinA second filter capacitor CoutAnd a load resistor RL(ii) a The DC/DC converter is connected with the first filter capacitor C in frontinIs connected to the second filter capacitor CoutSaid load resistance RLAnd the second filter capacitor CoutAnd the voltage division sampling resistors are connected in parallel. By providing a first filter capacitor CinA second filter capacitor CoutAnd a load resistor RLThe voltage stabilizing function can be achieved.
As shown in fig. 5, the switching tube driving signal control circuit 200 includes a voltage-current double closed-loop control module 201 and a PWM controller 202. The voltage-current dual closed-loop control module 201 is used for controlling the output current i of the DC/DC converterdcAnd said sampled feedback voltage VfeedbackPerforming voltage and current double closed-loop control and outputting a modulation signal; and the PWM controller is used for processing the modulation signal to obtain the driving signal. It can be understood that the voltage-current double closed-loop control can make the DC/DC converter output the desired voltage and current, so that the system is more stable and robust against disturbance, for example, in the case of input voltage or load variation, the output voltage and current can be kept constant in a steady state. The input of the voltage and current double closed loop control module 201 is idc、VfeedbackAnd a reference voltage VrefThe output should be a modulated signal obtained through voltage-current double closed-loop control. The PWM controller obtains a driving signal through comparison between the carrier wave and the modulation wave, and controls the switching on and off of the switching tube of the DC/DC converter 101.
Further, the switch tube driving signal control circuit further comprises a magnetic isolation module 203 and a low voltage locking module 204.
The magnetic isolation module 203 is located between the voltage and current double closed-loop control module 201 and the PWM controller 202, and is configured to electrically isolate the modulation signal output by the voltage and current double closed-loop control module 201, and input the modulation signal subjected to magnetic isolation to the PWM controller 203. The magnetic isolation module 203 is used for realizing electrical isolation of input and output signals.
The low voltage locking module 204 is used for locking the input voltage V of the DC/DC converter 101inAnd when the output voltage is lower than the preset value, locking the PWM controller and not outputting the driving signal.
The specific structures of the voltage-current dual-closed-loop control module 201, the magnetic isolation module 203, the low-voltage locking module 204 and the PWM controller 202 may refer to the prior art, and are not described herein again.
As shown in FIG. 6, the relay switch circuit 300 includes three relay switches K1、K2、K3And three shift resistors R3、R4、R5By the combination of the three relay switch states, the DC/DC converter main circuit 100 can output the output voltage V of five gearsoutAnd the voltage boosting and reducing function is realized on the basis of rated voltage.
The relay switch K1、K2、K3Has the following characteristics: inside contains two switches, first switch and second switch, and inside switch coil and lower switch coil in addition, when last switch coil (the upwards coil of dialling of relay on-off control) circular telegram, switches on first switch and second switch are all, and to the circular telegram of lower switch coil (the upwards coil of dialling of relay on-off control), first switch and second switch are all switched on down. For convenience of representing the state of the switch of the relay, it can be defined that 1 represents that the upper switch coil is energized, the first switch and the second switch are both turned on above, and the upper conduction is performed, 0 represents that the lower switch coil is energized, and the first switch and the second switch are both turned on below and the lower conduction is performed.
Specifically, as shown in fig. 6, a relay switch K1Input of the first switch and relay switch K2Is connected with the input of the first switch, and the relay switch K1The upper output of the first switch is connected with a first gear shifting resistor R3Rear and out1Connected with each other, and connected with a second gear shifting resistor R after the lower output4Rear and out1Connecting;
relay switch K1Input and out of the second switch1Connected with a relay switch K1Upper output and output voltage V of the second switchoutThe lower output is connected with GND;
relay switch K2Lower output of the first switch and relay switch K2And the input of the second switch is connected with the Adj output end of the main circuit of the DC/DC converter; wherein the Adj output terminal is located at the first resistor R1And a second resistor R2To (c) to (d);
relay switch K2The lower output of the second switch and the relay switch K3The input of the first switch is connected;
relay switch K3The lower output of the first switch is connected with a third gear shifting resistor R5Rear and out1Are connected.
According to the permutation and combination of the three relay switch states, 8 combination modes can be obtained, and the output result is shown in table 1, wherein the command is used for controlling the switch states of the relays, the command can be sent by an upper computer, and the sent command is effective in low level.
Table 1 output results of 8 combinations of three relay switches
Instructions K1 K2 K3 Outputting the result
Instruction 3 1 1 1 Adj is unsettled
Instruction 3 1 1 0 Adj is unsettled
Instruction 3 0 1 1 Adj is unsettled
Instruction 3 0 1 0 Adj is unsettled
Instruction 2 1 0 1 R1//R3
Instruction 1 1 0 0 R1//R3//R5
Instruction 4 0 0 1 R2//R4
Instruction 5 0 0 0 R2//R4//R5
As can be seen from Table 1, when the relay switch K is on2When the two switches are conducted, no matter the relay switch K1And K3In any case, the output voltages of the main circuits 100 of the DC/DC converter are all
Figure BDA0002939329660000071
The voltage value is the rated voltage of the switching power supply of the invention.
At relay switch K2If the two switches are on, if the relay switch K is turned on1On, the switching power supply of the invention is in a boost mode, if the relay switch K is on1When the voltage is turned off, the switching power supply is in a step-down mode. In particular, if relay switch K1On, and relay switch K2Is turned on, the first resistor R1And a first shift resistor R3Parallel connection if relay switch K1On, and relay switch K2Is turned on, the first resistor R is turned off1And a first shift resistor R3A third shift resistor R5In parallel, there are two levels of output voltage in boost mode. If relay switch K1Is turned on downwards, and a relay switch K2Is turned on, then the second resistor R2And a second shift resistor R4Parallel connection if relayDevice switch K1Is turned on downwards, and a relay switch K2Is turned on, then the second resistor R is turned on2And a second shift resistor R4A third shift resistor R5In parallel, therefore, under the voltage reduction mode, two output voltages are provided.
In summary, the voltage-regulating output switch power supply of the invention samples the feedback voltage VfeedbackThe voltage boosting and reducing function can be realized on the basis of keeping unchanged, the voltages with five sizes are output, the interlocking function is realized among the five output voltages (the interlocking function means that only one voltage size is output at each time, the five output voltages cannot be output simultaneously), and the voltage boosting and reducing device can be used for different power supply requirement working conditions. The voltage-regulating output switch power supply has the advantages of simple principle, low cost, practicability, reliability and convenient popularization, and can be applied to the situation that the sampling feedback voltage V is not changedfeedbackOn the basis of the required output voltage VoutA variable condition.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (8)

1. A voltage-regulating output switch power supply is characterized by comprising a DC/DC converter main circuit, a switch tube driving signal control circuit and a relay switch circuit for controlling voltage-regulating output;
the DC/DC converter main circuit comprises a DC/DC converter and a voltage division sampling resistor;
the switching tube driving signal control circuit is used for sending a driving signal to control the switching on and switching off of a switching tube of the DC/DC converter;
the relay switch circuit comprises a plurality of relay switches and a plurality of gear shifting resistors, and different series-parallel relations between the plurality of gear shifting resistors and the voltage dividing sampling resistor are realized by controlling the switch states of the plurality of relay switches, so that the DC/DC converter main circuitThe circuit outputs different output voltages Vout。
2. The voltage regulated output switching power supply according to claim 1, wherein the voltage across said divided sampling resistor is the output voltage Vout；
The voltage division sampling resistor comprises a first resistor R1And a second resistor R2Said second resistance R2The voltage at two ends is sampling feedback voltage Vfeedback。
The switching tube of the DC/DC converter is controlled to be switched on and off by the switching tube driving signal control circuit, so that the sampling feedback voltage V is stablefeedbackIs always equal to the reference voltage Vref。
3. The regulated output switching power supply of claim 2, wherein said switching tube drive signal control circuit comprises a voltage-current dual closed-loop control module and a PWM controller;
the voltage and current double closed loop control module is used for controlling the output current i of the DC/DC converterdcAnd said sampled feedback voltage VfeedbackPerforming voltage and current double closed-loop control and outputting a modulation signal;
and the PWM controller is used for processing the modulation signal to obtain the driving signal.
4. The regulated output switching power supply according to claim 3, wherein said switching tube drive signal control circuit further comprises a magnetic isolation module and a low voltage lockout module;
the magnetic isolation module is positioned between the voltage and current double closed-loop control module and the PWM controller and is used for electrically isolating the modulation signal output by the voltage and current double closed-loop control module and inputting the modulation signal subjected to magnetic isolation into the PWM controller;
the low-voltage locking module is used for locking the input voltage V of the DC/DC converterinWhen the PWM controller is lower than a preset value, the PWM controller is lockedThe drive signal is not output.
5. The voltage regulated output switching power supply of claim 2, wherein said relay switches are three, said shift resistors are three;
the main circuit of the DC/DC converter has five output voltages Vout。
6. The voltage regulated output switching power supply according to claim 5, wherein each of said relay switches includes a first switch and a second switch therein, said first switch and said second switch being both turned on when said upper switch coil is energized, and said first switch and said second switch being both turned on when said lower switch coil is energized.
7. The regulated output switching power supply of claim 6, wherein the relay switch K1Input of the first switch and relay switch K2Is connected with the input of the first switch, and the relay switch K1The upper output of the first switch is connected with a first gear shifting resistor R3Rear and out1Connected with each other, and connected with a second gear shifting resistor R after the lower output4Rear and out1Connecting;
relay switch K1Input and out of the second switch1Connected with a relay switch K1Upper output and output voltage V of the second switchoutThe lower output is connected with GND;
relay switch K2Lower output of the first switch and relay switch K2And the input of the second switch is connected with the Adj output end of the main circuit of the DC/DC converter; wherein the Adj output terminal is located at the first resistor R1And said second resistance R2To (c) to (d);
relay switch K2The lower output of the second switch and the relay switch K3The input of the first switch is connected;
relay switch K3The lower output of the first switch is connected with a third gear shifting resistor R5Rear and out1Are connected.
8. The regulated output switching power supply of claim 1, wherein said DC/DC converter main circuit further comprises a first filter capacitor CinAnd a second filter capacitor CoutAnd a load resistor RL；
The DC/DC converter is connected with the first filter capacitor C in frontinIs connected to the second filter capacitor Cout；
The load resistor RLAnd the second filter capacitor CoutAnd the voltage division sampling resistors are connected in parallel.
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN113625814A (en) * 2021-08-13 2021-11-09 深圳时代能创能源科技有限公司 Voltage regulating circuit for switching power supply
CN113629825A (en) * 2021-09-03 2021-11-09 苏州馥昶空间技术有限公司 Battery constant voltage switching protection circuit and battery charger

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CN106921293A (en) * 2017-05-08 2017-07-04 深圳陆巡科技有限公司 Based on it is numerically controlled can real time linear regulation output DC DC translation circuits
CN108736706A (en) * 2018-08-01 2018-11-02 杭州老板电器股份有限公司 Controllable switch power supply and purification water tank comprising the power supply
CN212063833U (en) * 2020-05-04 2020-12-01 上海欧切斯实业有限公司 Power supply circuit with adjustable output current and voltage

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Publication number Priority date Publication date Assignee Title
US20090212757A1 (en) * 2008-02-26 2009-08-27 Kerio Technologies, Inc., Voltage transformer with sequentially switchable voltage selection circuit
CN106921293A (en) * 2017-05-08 2017-07-04 深圳陆巡科技有限公司 Based on it is numerically controlled can real time linear regulation output DC DC translation circuits
CN108736706A (en) * 2018-08-01 2018-11-02 杭州老板电器股份有限公司 Controllable switch power supply and purification water tank comprising the power supply
CN212063833U (en) * 2020-05-04 2020-12-01 上海欧切斯实业有限公司 Power supply circuit with adjustable output current and voltage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113625814A (en) * 2021-08-13 2021-11-09 深圳时代能创能源科技有限公司 Voltage regulating circuit for switching power supply
CN113625814B (en) * 2021-08-13 2022-05-17 深圳时代能创能源科技有限公司 Voltage regulating circuit for switching power supply
CN113629825A (en) * 2021-09-03 2021-11-09 苏州馥昶空间技术有限公司 Battery constant voltage switching protection circuit and battery charger

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