CN212909357U - Cascaded direct current power supply constant current output circuit - Google Patents
Cascaded direct current power supply constant current output circuit Download PDFInfo
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- CN212909357U CN212909357U CN202022045713.3U CN202022045713U CN212909357U CN 212909357 U CN212909357 U CN 212909357U CN 202022045713 U CN202022045713 U CN 202022045713U CN 212909357 U CN212909357 U CN 212909357U
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Abstract
The utility model belongs to the field of constant current output control, in particular to a cascade direct current power supply constant current output circuit, which comprises two three-phase uncontrolled rectifying circuits connected in parallel and is connected with a power supply, wherein the output end of each three-phase uncontrolled rectifying circuit is connected with a capacitor in parallel to convert a three-phase power supply into direct current, and the two ends of the capacitor are connected with a single-phase inverter circuit to invert the direct current into alternating current; the output of single-phase inverter circuit connects the transformer and inserts a single-phase uncontrollable rectifier circuit after carrying out electrical isolation, connects voltage sampling circuit at single-phase uncontrollable rectifier circuit's output, gathers output voltage and to a singlechip transmission signal, wherein single-phase inverter circuit connects modulation circuit all the way, connects carrier generator in modulation circuit's one end, and the singlechip is connected to the other end, the utility model discloses circuit structure's setting can reduce the influence that the error of components and parts self brought, makes output voltage balanced, reaches protection circuit's purpose.
Description
Technical Field
The utility model belongs to constant current output control field especially relates to a tandem type DC power supply constant current output circuit.
Background
When a traditional full-bridge converter circuit works, a controllable power device is used as a switching device, the generated voltage waveform is an alternating current square wave by controlling the on or off of the FETD1 and the FETD4 or the FETD2 and the FETD3 at the same time, and then the direct current voltage is output after voltage transformation and rectification. The switching tube provides a feedback channel for reactive power in the form of an anti-parallel diode, and the inversion output voltage can be controlled by controlling the on-off duty ratio of the switching device. The circuit is characterized in that although the transformer is fully utilized, the primary side of the transformer is an alternating current input voltage containing a direct current component, and the primary side of the transformer has the possibility of voltage short circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a tandem type DC power supply constant current output circuit is provided, reduces the influence that the error of components and parts self brought, makes output voltage balanced.
The utility model discloses a realize like this, a tandem type DC power supply constant current output circuit, including two parallelly connected three-phase uncontrolled rectifier circuit, be connected with the power of output, the output of three-phase uncontrolled rectifier circuit connects in parallel a electric capacity and turns into the direct current with three-phase power supply, is connected with single-phase inverter circuit through the both ends of electric capacity and inverts the direct current into alternating current; the output end of the single-phase inverter circuit is connected with a transformer for electrical isolation and then connected with a single-phase uncontrolled rectifying circuit, the output end of the single-phase uncontrolled rectifying circuit is connected with a voltage sampling circuit, output voltage is collected and signals are transmitted to a single chip microcomputer, one single-phase inverter circuit is connected with a modulation circuit, one end of the modulation circuit is connected with a carrier wave generator, the other end of the modulation circuit is connected with the single chip microcomputer, one single chip microcomputer is used as reference voltage for comparison, signals are sent to the modulation circuit through the single chip microcomputer and the carrier wave generator, the one-way inverter circuit is modulated, and the output voltages of the.
Further, the two three-phase uncontrolled rectifying circuits comprise three groups of diodes, each group comprises two diodes connected in series, and each group is connected with one phase of the power supply.
Furthermore, the single-phase inverter circuit comprises two thyristor groups, each thyristor group comprises two thyristors connected in series, and a lead in the middle of the two thyristor groups is connected with the primary side of the transformer.
Further, the single-phase uncontrolled rectifying circuit is connected with the secondary side of the transformer and comprises two diode groups consisting of four diodes, and each diode group comprises two diodes connected in series.
Furthermore, a filter capacitor is connected between the single-phase uncontrolled rectifying circuit and the voltage sampling circuit.
Furthermore, a second filter capacitor connected with a switch in series is connected between one single-phase uncontrolled rectifying circuit and the voltage sampling circuit.
Further, a load is connected between the two single-phase uncontrolled rectifying circuits.
Further, the type of the single chip microcomputer is as follows: STM32F103ZET 6.
Further, the voltage sampling circuit uses a voltage sensor with the model number of TBV 5/25A.
Compared with the prior art, the utility model, beneficial effect lies in: the utility model discloses circuit structure's setting can reduce the influence that the error of components and parts self brought, makes output voltage balanced, reaches protection circuit's purpose.
Drawings
Fig. 1 is a schematic diagram of a circuit structure provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage acquisition circuit provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a cascaded constant current output circuit of a direct current power supply comprises two three-phase uncontrolled rectifying circuits connected in parallel and connected with an output power supply, wherein the output end of each three-phase uncontrolled rectifying circuit is connected with a capacitor in parallel to convert a three-phase power supply into direct current, and a single-phase inverter circuit is connected with two ends of the capacitor to invert the direct current into alternating current; the output end of the single-phase inverter circuit is connected with a transformer for electrical isolation and then connected with a single-phase uncontrolled rectifying circuit, the output end of the single-phase uncontrolled rectifying circuit is connected with a voltage sampling circuit, output voltage is collected and signals are transmitted to a single chip microcomputer, one single-phase inverter circuit is connected with a modulation circuit, one end of the modulation circuit is connected with a carrier wave generator, the other end of the modulation circuit is connected with the single chip microcomputer, one single chip microcomputer is used as reference voltage for comparison, signals are sent to the modulation circuit through the single chip microcomputer and the carrier wave generator, the one-way inverter circuit is modulated, and the output voltages of the.
The two three-phase uncontrolled rectifying circuits comprise three groups of diodes, each group comprises two diodes which are connected in series, and each group is connected with one phase of the power supply. Referring to fig. 1, a group of three-phase uncontrolled rectifying circuits includes 6 diodes (D1-D6) to form three groups of diodes. The other group of three-phase uncontrolled rectifying circuit comprises 6 diodes (D11-D16) which form three groups of diodes. Two three-phase uncontrolled rectifying circuits are connected in parallel.
When the output voltage of the power supply is higher than the diode conducting voltage Ud, a certain pair of diodes in the upper bridge arm and the lower bridge arm can be conducted, and the largest item in the alternating-current side bus voltage is equal to the direct-current voltage value at two ends of the load. When the power output voltage is lower than the diode turn-on voltage Ud, which will stop all diodes in the circuit from turning on, the capacitor C1 or the capacitor C2 will form a loop by discharging to the load to consume energy. The circuit is used for converting a three-phase power supply into direct current.
The single-phase inverter circuit comprises two groups of thyristor groups, each group comprises two thyristors connected in series, and a lead in the middle of each group of thyristor groups is connected with the primary side of a transformer. Referring to fig. 1, a single-phase inverter circuit is composed of thyristors (FETD 1-FETD 4), and is connected in series with a three-phase uncontrolled rectifier circuit composed of diodes (D1-D6) (thyristors (FETD 5) -FETD 8) to form a single-phase inverter circuit, and is connected in series with another three-phase uncontrolled rectifier circuit composed of diodes (D11-D16) to invert direct current into alternating current.
The two single-phase uncontrolled rectifying circuits are connected with the secondary side of the transformer and comprise two groups of diodes consisting of four diodes, and each group comprises two diodes connected in series. One path of single-phase uncontrolled rectifying circuit comprises diodes (D7-D10), and the other path comprises diodes (D17-D20)
A first filter capacitor (C3, C4) is connected between the single-phase uncontrolled rectifying circuit and the voltage sampling circuit.
And a second filter capacitor C5 connected in series with a switch K is also connected between one single-phase uncontrolled rectifying circuit and the voltage sampling circuit.
And a load is connected between the two single-phase uncontrolled rectifying circuits. The two rectifying circuits are connected in series, and the whole circuit forms a parallel input and series output mode. The output ends of the two single-phase uncontrolled rectifying circuits are respectively connected with a voltage sampling circuit, the output voltages are collected and transmitted to the single chip microcomputer, one of the output voltages is used as reference voltage for comparison, the single chip microcomputer and the carrier generator send signals to the modulation circuit, and thyristors in the inverter circuit are modulated, so that the output voltages of the two single-phase uncontrolled rectifying circuits are consistent. The type of the singlechip is as follows: STM32F103ZET 6. Referring to FIG. 2, the voltage sampling circuit uses a voltage sensor model TBV 5/25A.
The working principle of the novel circuit.
Three-phase alternating current input is output to two ends of a load after three-phase rectification, filtering, inversion, transformation and rectification filtering, and constant-current voltage-sharing output is realized through current and voltage feedback double closed loops. The set load resistance R is purely resistive. The power supply working principle of the topological structure is as follows:
when a certain pair of diodes are conducted, the three-phase power supply is rectified and output, and the output voltage value is the maximum value of the alternating-current side line voltage. If the diodes are not conducted, the capacitor immediately discharges the load resistor to consume energy, so that the output voltage is reduced.
The voltage type full-bridge inverter circuit is formed by combining four independent switching devices and diodes in parallel connection to form two-way bridge arms, and each bridge arm guides the excitation of a high-frequency power transformer and carries out energy conversion. In the inverter circuit, the diagonal switching devices are respectively used as a pair, when a certain pair of power switching devices is conducted, the other pair stops running, when the two ends of the thyristor FETD2 and the thyristor FETD3 support input voltage, the full-bridge converter obtains high-frequency square wave alternating-current voltage at one high-frequency side, the voltage is reduced by the transformer, the high-frequency square wave alternating-current voltage is converted into direct-current square waves through the rectifier, and then the direct-current square waves are output after being filtered by the inductor and the capacitor, so that direct-current voltage is obtained on a load. After the bridge arm of the diode D1, the diode D4 or the diode D2 and the diode D3 stops circulating conduction, the duration of each non-conduction is about 2%, so that the bridge arm is prevented from being directly conducted to damage a switching device.
In the control circuit, when the load resistance is changed, the pwm pulse duty ratio of a power switch device in the upper half part of the inverter circuit is changed and controlled through sampling the load current by the singlechip, so that the output voltage linearly changes along with the change of the load to realize constant current output; the output voltages of the upper part and the lower part are respectively sampled, the pwm pulse duty ratio of a power switch device in the inverter circuit at the lower half part is changed and controlled through the singlechip, the output voltages of the lower half part and the upper half part are kept the same, and voltage-sharing output is realized.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A cascade direct current power supply constant current output circuit is characterized in that the circuit comprises two three-phase uncontrolled rectifying circuits which are connected in parallel and connected with a power supply, the output end of each three-phase uncontrolled rectifying circuit is connected with a capacitor in parallel to convert a three-phase power supply into direct current, and a single-phase inverter circuit is connected with two ends of the capacitor to invert the direct current into alternating current; the output end of the single-phase inverter circuit is connected with a transformer for electrical isolation and then connected with a single-phase uncontrolled rectifying circuit, the output end of the single-phase uncontrolled rectifying circuit is connected with a voltage sampling circuit, output voltage is collected and signals are transmitted to a single chip microcomputer, one single-phase inverter circuit is connected with a modulation circuit, one end of the modulation circuit is connected with a carrier wave generator, the other end of the modulation circuit is connected with the single chip microcomputer, one single chip microcomputer is used as reference voltage for comparison, signals are sent to the modulation circuit through the single chip microcomputer and the carrier wave generator, the one-way inverter circuit is modulated, and the output voltages of the.
2. A circuit according to claim 1, wherein the two three-phase uncontrolled rectifying circuits comprise three sets of diodes, each set comprising two diodes in series, each set being connected to one phase of the power supply.
3. The circuit of claim 1, wherein the single-phase inverter circuit comprises two thyristor groups, each thyristor group comprising two thyristors connected in series, and wherein the middle leads of the two thyristor groups are connected to the primary side of the transformer.
4. The circuit of claim 1 wherein the single-phase uncontrolled rectifying circuit is connected to the secondary side of the transformer and comprises two diode groups of four diodes, each group comprising two diodes in series.
5. The circuit of claim 1 wherein a first filter capacitor is connected between the single-phase uncontrolled rectifying circuit and the voltage sampling circuit.
6. The circuit of claim 5, wherein a second filter capacitor having a switch connected in series is further connected between a single-phase uncontrolled rectifying circuit and the voltage sampling circuit.
7. A circuit according to claim 1, characterized in that a load is connected between the two single-phase uncontrolled rectifying circuits.
8. The circuit according to claim 1, wherein the type of the single chip microcomputer is: STM32F103ZET 6.
9. The circuit of claim 1, wherein the voltage sampling circuit uses a model TBV5/25A voltage sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022045713.3U CN212909357U (en) | 2020-09-17 | 2020-09-17 | Cascaded direct current power supply constant current output circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022045713.3U CN212909357U (en) | 2020-09-17 | 2020-09-17 | Cascaded direct current power supply constant current output circuit |
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| CN212909357U true CN212909357U (en) | 2021-04-06 |
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| CN202022045713.3U Expired - Fee Related CN212909357U (en) | 2020-09-17 | 2020-09-17 | Cascaded direct current power supply constant current output circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499216A (en) * | 2022-04-13 | 2022-05-13 | 国网智能电网研究院有限公司 | Voltage regulation power supply |
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2020
- 2020-09-17 CN CN202022045713.3U patent/CN212909357U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499216A (en) * | 2022-04-13 | 2022-05-13 | 国网智能电网研究院有限公司 | Voltage regulation power supply |
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Granted publication date: 20210406 |