CN215186466U - Wide output range's two-way step-up and step-down circuit and test power supply - Google Patents
Wide output range's two-way step-up and step-down circuit and test power supply Download PDFInfo
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- CN215186466U CN215186466U CN202120810259.8U CN202120810259U CN215186466U CN 215186466 U CN215186466 U CN 215186466U CN 202120810259 U CN202120810259 U CN 202120810259U CN 215186466 U CN215186466 U CN 215186466U
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Abstract
The utility model provides a two-way lift voltage circuit and test power supply of wide output range need use high-voltage switch pipe or use the switch tube series connection mode of independent input direct current generating line when having solved output high pressure among the prior art, not only increases the test cost, also influences system test efficiency's technical problem. The bidirectional BUCK-BOOST circuit comprises a bidirectional BUCK/BOOST circuit and a BUCK-BOOST circuit, the two circuits share an input direct current bus, and wide-range voltage output can be realized; the utility model also provides a wide output range test power supply, including voltage feedback control circuit, current feedback control circuit, PWM generating circuit and above-mentioned two-way buck-boost circuit, this power is under the condition that does not use higher withstand voltage switch tube, has effectively improved the voltage output scope.
Description
Technical Field
The utility model relates to a high-power test power field, in particular to two-way lift voltage circuit and test power of wide output range can be used to high-power alternating current-direct current output test power field.
Background
In a direct current test power supply, the range of the direct current output voltage of the rear stage of the direct current test power supply is required to be wide, and in the prior art, a high-voltage switch tube or two sets of circuits independently inputting direct current buses are often required to be connected in series when outputting high voltage, so that the test cost is increased, and the system efficiency is also influenced. Due to the self characteristics of devices, the high-voltage switch tube has low switching frequency, so that the system has poor dynamic characteristics and large loss; two sets of independent bus power circuits are connected in series, and although a low-voltage switch tube is also adopted, because an independent direct-current bus is needed, two sets of rectification circuits are needed for providing the independent bus at the preceding stage, and the use cost is increased.
The scheme provided by the invention adopts the low-voltage switch tube and shares the direct-current bus (only one set of rectifying circuit is needed at the preceding stage), so that the cost can be reduced, the wide-range voltage output is realized, and the service efficiency of the system is improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve prior art when test power supply output is high-pressure, need use high-voltage switch pipe or use the switch tube series mode, cause the technical problem that system output efficiency is lower, the hardware cost is higher, provided a wide output range's two-way lift voltage circuit and test power supply, adopted sharing input direct current generating line, under the condition that does not use higher withstand voltage switch pipe, effectively improved the voltage output scope.
The technical solution of the utility model is that:
a bidirectional buck-boost circuit with wide output range is characterized in that: comprises a first unit circuit and a second unit circuit;
the first unit circuit is a bidirectional BUCK/BOOST circuit and comprises a first capacitor C1, a first switch tube V1, a second switch tube V2, a first inductor L1 and a second capacitor C2, wherein the first capacitor C1, the first switch tube V1, the second switch tube V2, the first inductor L1 and the second capacitor C2 are connected between the high end of an output power supply and the ground; the grid electrode of the first switch tube V1 is connected with an external drive signal PWM1, the drain electrode of the first switch tube V1 is connected with the input end of the direct current bus, and the source electrode of the first switch tube V2 is connected with the drain electrode of the second switch tube V2 and one end of a first inductor L1; the other end of the first inductor L1 is connected with the high end of an output power supply; the source electrode of the second switch tube V2 is grounded, and the grid electrode of the second switch tube V2 is connected with an external driving signal PWM 2;
the second unit circuit is a bidirectional BUCK-BOOST circuit and comprises a third capacitor C3, a third switching tube V3, a fourth switching tube V4, a second inductor L2 and a fourth capacitor C4, wherein the third capacitor C3, the third switching tube V3, the fourth switching tube V4 and the second inductor L2 are connected between the input end of the direct-current bus and the ground; the grid electrode of the third switch tube V3 is connected with an external driving signal PWM3, the drain electrode of the third switch tube V3 is connected with the input end of the direct current bus, and the source electrode of the third switch tube V4 is connected with the drain electrode of the fourth switch tube V4 and one end of the second inductor L2; the other end of the second inductor L2 is grounded; the source of the fourth switching tube V4 is connected to the low end of the output power supply, and the gate is connected to the external driving signal PWM 4.
Further, the maximum voltage borne by the first switch tube V1, the second switch tube V2, the third switch tube V3 and the fourth switch tube V4 does not exceed the input voltage.
Further, the first switch tube V1, the second switch tube V2, the third switch tube V3 and the fourth switch tube V4 are all IGBTs or MOSFETs.
Meanwhile, the utility model also provides a wide output range test power supply, which comprises a voltage feedback control circuit, a current feedback control circuit, a PWM generating circuit and a bidirectional buck-boost circuit;
the voltage feedback control circuit comprises a first voltage sampling processing unit, a first voltage ring, a second voltage sampling processing unit and a second voltage ring; the current feedback control circuit comprises a current sampling processing unit, a first current loop and a second current loop;
the input end of the first voltage sampling processing unit is connected with the high end of the output power supply, and the output end of the first voltage sampling processing unit is connected with one input end of the first voltage ring; the other input end of the first voltage ring is connected with a reference voltage Vref, and the output end of the first voltage ring is connected with one input end of the first current ring; the input end of the second voltage sampling processing unit is connected with the low end of the output power supply, and the output end of the second voltage sampling processing unit is connected with one input end of the second voltage ring; the other input end of the second voltage ring is connected with a reference voltage Vref, and the output end of the second voltage ring is connected with one input end of the second current ring;
the sampling end of the current sampling processing unit is connected in series with the high end of the output power supply, and the output end of the current sampling processing unit is respectively connected with the other input ends of the first current loop and the second current loop;
the PWM generating circuit comprises a first PWM generating unit and a second PWM generating unit; the input end of the first PWM generating unit is connected with the output end of the first current loop, and the output end of the first PWM generating unit comprises driving signals PWM1 and PWM 2; the input end of the second PWM generating unit is connected with the output end of the second current loop, and the output end of the second PWM generating unit comprises driving signals PWM3 and PWM 4;
the bidirectional buck-boost circuit comprises a first unit circuit and a second unit circuit which share the input end of the direct-current bus; the first unit circuit is a bidirectional BUCK/BOOST circuit, the input end of the first unit circuit is respectively connected with the driving signals PWM1 and PWM2, and the output end of the first unit circuit is connected with the high end of the output power supply; the second unit circuit is a bidirectional BUCK-BOOST circuit, the input end of the second unit circuit is respectively connected with the driving signals PWM3 and PWM4, and the output end of the second unit circuit is connected with the low end of the output power supply.
Further, the first unit circuit comprises a first capacitor C1, a first switch tube V1, a second switch tube V2, a first inductor L1 and a second capacitor C2, wherein the first capacitor C1, the first switch tube V1, the second switch tube V2 and the first inductor L1 are connected between the input end of the direct current bus and the ground; the grid electrode of the first switch tube V1 is connected with a driving signal PWM1, the drain electrode of the first switch tube V1 is connected with the input end of a direct current bus, and the source electrode of the first switch tube V2 is connected with the drain electrode of the second switch tube V2 and one end of a first inductor L1; the other end of the first inductor L1 is connected with the high end of the output power supply; the source electrode of the second switch tube V2 is grounded, and the grid electrode of the second switch tube V2 is connected with a driving signal PWM 2;
the second unit circuit comprises a third capacitor C3, a third switch tube V3, a fourth switch tube V4, a second inductor L2 and a fourth capacitor C4, wherein the third capacitor C3, the third switch tube V3, the fourth switch tube V4, the second inductor L2 and the fourth capacitor C4 are connected between the ground and the low end of the output power supply; the grid electrode of the third switch tube V3 is connected with a driving signal PWM3, the drain electrode of the third switch tube V3 is connected with the input end of the direct current bus, and the source electrode of the third switch tube V4 is connected with the drain electrode of the fourth switch tube V4 and one end of the second inductor L2; the other end of the second inductor L2 is grounded; the source of the fourth switching tube V4 is connected to the low end of the output power supply, and the gate is connected to the driving signal PWM 4.
Further, the maximum voltage borne by the first switching tube V1, the second switching tube V2, the third switching tube V3 and the fourth switching tube V4 is not greater than the voltage at the input end of the direct current bus.
Further, the first switch tube V1, the second switch tube V2, the third switch tube V3 and the fourth switch tube V4 are all IGBTs or MOSFETs.
Compared with the prior art, the utility model, its beneficial effect as follows:
1) the utility model relates to a two-way BUCK-BOOST circuit of wide output range of test power supply adopts sharing input direct current generating line, and the first unit circuit that adopts is two-way BUCK BOOST circuit, and the second unit circuit is two-way BUCK-BOOST circuit, under the condition that does not use higher withstand voltage switch tube, realizes high output voltage. The voltage output range is effectively improved, the utilization rate of the circuit is improved, and the size and the cost of system hardware are reduced.
2) The utility model discloses the two-way buck-boost circuit of the wide output range of test power supply, sharing direct current generating line and back stage circuit series control have not only improved the output voltage scope, can carry out the phase error control in addition on the control, improve circuit equivalent switching frequency, can the dynamic characteristic of lift system and reduce output ripple voltage.
Drawings
Fig. 1 is a wide output range bi-directional buck-boost circuit topology according to the present invention;
fig. 2 is a schematic diagram showing the relationship between the driving signals of the first switch tube V1 and the second switch tube V2 in the bi-directional buck-boost circuit with a wide output range according to the present invention;
fig. 3 is a schematic diagram showing the relationship between the driving signals of the third switching tube V3 and the fourth switching tube V4 in the bi-directional buck-boost circuit with a wide output range according to the present invention;
fig. 4 is a system control block diagram of the wide output range test power supply of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
The wide-output-range bidirectional BUCK-BOOST circuit disclosed by the invention is formed by combining a bidirectional BUCK/BOOST circuit and a BUCK-BOOST circuit as shown in figure 1, wherein the two bidirectional BUCK/BOOST circuits share an input direct-current bus; because the output voltage of the BUCK-BOOST circuit is negative relative to the input voltage, large-range boosting output can be realized under the condition of not increasing the withstand voltage of a switching tube, and the output voltage is Vo1+ Vo 2; the first unit circuit comprises a first capacitor C1, a first switch tube V1, a second switch tube V2, a first inductor L1 and a second capacitor C2, wherein the first capacitor C1, the first switch tube V1, the second switch tube V2, the first inductor L1 and the second capacitor C2 are connected between the high end of an output power supply and the ground; the anode of the first capacitor C1 is connected with the input end of the direct current bus, and the cathode of the first capacitor C1 is grounded; the grid electrode of the first switch tube V1 is connected with the driving signal PWM1, the drain electrode is connected with the input end of the direct current bus, the source electrode is connected with the drain electrode of the second switch tube V2, the source electrode is simultaneously connected with one end of a first inductor L1, and the other end of the first inductor L1 is connected with the high end of the output power supply; the source electrode of the second switch tube V2 is grounded, and the grid electrode of the second switch tube V2 is connected with a driving signal PWM 2; the anode of the second capacitor C2 is connected with the high end of the output power supply, and the cathode of the second capacitor C2 is grounded;
the second unit circuit comprises a third capacitor C3, a third switching tube V3, a fourth switching tube V4, a second inductor L2 and a fourth capacitor C4, wherein the third capacitor C3, the third switching tube V3, the fourth switching tube V4, the second inductor L2 and the fourth capacitor C4 are connected between the ground and the low end of the output power supply; the anode of the third capacitor C3 is connected with the input end of the direct current bus, and the cathode of the third capacitor C3 is grounded; the grid electrode of the third switching tube V3 is connected with the driving signal PWM3, the drain electrode of the third switching tube V3 is connected with the input end of the direct current bus, the source electrode of the third switching tube V3 is connected with the drain electrode of the fourth switching tube V4, and the source electrode of the third switching tube V3 is simultaneously connected with one end of the second inductor L2; the other end of the second inductor L2 is grounded; the source electrode of the fourth switching tube V4 is connected with the low end of the output power supply, and the grid electrode of the fourth switching tube V4 is connected with a driving signal PWM 4; the positive electrode of the fourth capacitor C4 is grounded, and the negative electrode thereof is connected to the low end of the output power supply.
The working principle of the circuit is as follows:
1) bidirectional BUCK/BOOST circuit control
As shown in FIG. 2, the bidirectional BUCK/BOOST circuit works in a BUCK mode when outputting in a forward direction, and the bidirectional BUCK/BOOST circuit outputs voltage reduction at the time; when energy is fed back to the input, the system works in a BOOST mode, the driving signals of the switching tubes V1 and V2 are reversed (dead zones exist), and the voltages borne by the switching tubes V1 and V2 do not exceed the input voltage at most (the switching tube on-off spike voltage is not considered).
1.1) and when the output in the forward direction works in the BUCK mode, the output voltage is (the pipe voltage drop is not considered):
Vo1＝Vin*D1
vo1 is the amplitude of the output voltage of the BUCK/BOOST circuit; vin is the input dc bus voltage;
- - -D1 is the duty cycle of switching tube V1.
1.2), when working in the BOOST mode, the energy flows to the input side from the output this moment, and direct current input bus voltage is this moment:
Vin＝Vo1/D2
- - -D2 is the duty cycle of switching tube V2.
2) Bidirectional BUCK-BOOST circuit control
As shown in FIG. 3, the two switches V3 and V4 of the bidirectional BUCK-BOOST circuit drive the signal in reverse (with dead zone), and it can be seen that the bidirectional BUCK-BOOST circuit is in BUCK-BOOST mode when the energy flows in forward or reverse direction (feedback). The maximum withstand voltage of the switching tubes V3 and V4 does not exceed the maximum value of the input voltage and the output voltage (the switching tube on-off spike voltage is not considered), and because the output amplitudes of the system control Vo1 and Vo2 are the same, the output voltage is smaller than the input voltage in forward operation, so the maximum withstand voltage of the switching tubes V3 and V4 does not exceed the input voltage;
2.1), when the output voltage is positive, the output voltage is as follows:
Vo2＝-Vin*D3/(1-D3)
-Vo2 is the amplitude of the output voltage of the BUCK-BOOST circuit; vin is the input dc bus voltage;
-D3 is the duty cycle of switching tube V3;
the output polarity is negative with respect to the input voltage;
2.2), when energy is fed back, the input voltage of the bidirectional BUCK-BOOST circuit becomes:
Vin＝-Vo2*D4/(1-D4)
d4 is the duty cycle of switching tube V4.
Based on the bidirectional buck-boost circuit, the wide-output-range test power supply provided by the invention comprises a voltage feedback control circuit, a current feedback control circuit, a PWM (pulse width modulation) generation circuit and the bidirectional buck-boost circuit;
the voltage feedback control circuit comprises a first voltage sampling processing unit, a first voltage ring, a second voltage sampling processing unit and a second voltage ring; the current feedback control circuit comprises a current sampling processing unit, a first current loop and a second current loop;
the input end of the first voltage sampling processing unit is connected with the high end of the output power supply, and the output end of the first voltage sampling processing unit is connected with one input end of the first voltage ring; the other input end of the first voltage ring is connected with a reference voltage Vref, and the output end of the first voltage ring is connected with one input end of the first current ring; the input end of the second voltage sampling processing unit is connected with the low end of the output power supply, and the output end of the second voltage sampling processing unit is connected with one input end of the second voltage ring; the other input end of the second voltage loop is connected with a reference voltage Vref, and the output end of the second voltage loop is connected with one input end of the second current loop;
the sampling end of the current sampling processing unit is connected in series with the high end of the output power supply, and the output end of the current sampling processing unit is respectively connected with the other input ends of the first current loop and the second current loop;
the PWM generating circuit comprises a first PWM generating unit and a second PWM generating unit; the input end of the first PWM generating unit is connected with the output end of the first current loop, and the output end of the first PWM generating unit comprises driving signals PWM1 and PWM 2; the input terminal of the second PWM generating unit is connected to the output terminal of the second current loop, and the output terminal thereof includes the driving signals PWM3 and PWM 4.
The bidirectional buck-boost circuit comprises a first unit circuit and a second unit circuit which share the input end of the direct-current bus; the first unit circuit is a bidirectional BUCK/BOOST circuit, the input end of the first unit circuit is respectively connected with the driving signals PWM1 and PWM2, and the output end of the first unit circuit is connected with the high end of the output power supply; the second unit circuit is a bidirectional BUCK-BOOST circuit, the input end of the bidirectional BUCK-BOOST circuit is respectively connected with the driving signals PWM3 and PWM4, and the output end of the bidirectional BUCK-BOOST circuit is connected with the low end of the output power supply.
The system control block diagram of the test power supply is shown in fig. 4, the BUCK/BOOST circuit and the BUCK-BOOST circuit in the bidirectional BUCK-BOOST circuit are controlled by adopting independent voltage and current loops, the voltage amplitude instructions are the same to ensure that the amplitudes of output voltages are the same, and therefore the total output voltage is 2Vo 1; the current is feedback calculated using the same current.
The system control process of the test power supply is as follows:
vref is an output voltage given signal, and because the amplitudes of the upper and lower output voltages are the same, the voltage given signal is respectively sent to the respective voltage rings of the BUCK/BOOST circuit and the BUCK-BOOST circuit to serve as voltage given;
after the voltage loops of the two circuits are respectively regulated with respective voltage samples, the output quantities are sent to respective current loops; the current feedback of the current loop and the current loop is the same signal;
the output of each current loop enters a PWM signal generating circuit, and the generated PWM signals respectively control each switch tube to enable the output voltage to meet each requirement.
The total output voltage of the system is 2Vo1, and the maximum voltage borne by V1-V4 does not exceed the maximum input direct current bus voltage (voltage peak generated when the switch tube does not act is not considered), so the wide output range test power supply realizes high output voltage under the condition of not using a higher voltage-resistant switch tube, not only can improve the output range of the voltage, but also reduces the hardware cost.
The above disclosure is only for the specific embodiments of the present invention, however, the embodiments of the present invention are not limited thereto, and any changes that can be considered by those skilled in the art should fall into the protection scope of the present invention.
Claims (6)
1. A bidirectional buck-boost circuit with wide output range is characterized in that: comprises a first unit circuit and a second unit circuit;
the first unit circuit is a bidirectional BUCK/BOOST circuit and comprises a first capacitor C1, a first switch tube V1, a second switch tube V2, a first inductor L1 and a second capacitor C2, wherein the first capacitor C1, the first switch tube V1, the second switch tube V2, the first inductor L1 and the second capacitor C2 are connected between the high end of an output power supply and the ground; the grid electrode of the first switch tube V1 is connected with an external drive signal PWM1, the drain electrode of the first switch tube V1 is connected with the input end of the direct current bus, and the source electrode of the first switch tube V2 is connected with the drain electrode of the second switch tube V2 and one end of a first inductor L1; the other end of the first inductor L1 is connected with the high end of an output power supply; the source electrode of the second switch tube V2 is grounded, and the grid electrode of the second switch tube V2 is connected with an external driving signal PWM 2;
the second unit circuit is a bidirectional BUCK-BOOST circuit and comprises a third capacitor C3, a third switching tube V3, a fourth switching tube V4, a second inductor L2 and a fourth capacitor C4, wherein the third capacitor C3, the third switching tube V3, the fourth switching tube V4 and the second inductor L2 are connected between the input end of the direct-current bus and the ground; the grid electrode of the third switch tube V3 is connected with an external driving signal PWM3, the drain electrode of the third switch tube V3 is connected with the input end of the direct current bus, and the source electrode of the third switch tube V4 is connected with the drain electrode of the fourth switch tube V4 and one end of the second inductor L2; the other end of the second inductor L2 is grounded; the source of the fourth switching tube V4 is connected to the low end of the output power supply, and the gate is connected to the external driving signal PWM 4.
2. A wide output range bi-directional buck-boost circuit as claimed in claim 1, wherein: the maximum voltage borne by the first switch tube V1, the second switch tube V2, the third switch tube V3 and the fourth switch tube V4 does not exceed the input voltage.
3. A wide output range bi-directional buck-boost circuit as claimed in claim 2, wherein: the first switch tube V1, the second switch tube V2, the third switch tube V3 and the fourth switch tube V4 are all IGBTs or MOSFETs.
4. A wide output range test power supply characterized by: the voltage feedback control circuit, the current feedback control circuit, the PWM generating circuit and the bidirectional buck-boost circuit are included;
the voltage feedback control circuit comprises a first voltage sampling processing unit, a first voltage ring, a second voltage sampling processing unit and a second voltage ring; the current feedback control circuit comprises a current sampling processing unit, a first current loop and a second current loop;
the input end of the first voltage sampling processing unit is connected with the high end of the output power supply, and the output end of the first voltage sampling processing unit is connected with one input end of the first voltage ring; the other input end of the first voltage ring is connected with a reference voltage Vref, and the output end of the first voltage ring is connected with one input end of the first current ring; the input end of the second voltage sampling processing unit is connected with the low end of the output power supply, and the output end of the second voltage sampling processing unit is connected with one input end of the second voltage ring; the other input end of the second voltage ring is connected with a reference voltage Vref, and the output end of the second voltage ring is connected with one input end of the second current ring;
the sampling end of the current sampling processing unit is connected in series with the high end of the output power supply, and the output end of the current sampling processing unit is respectively connected with the other input ends of the first current loop and the second current loop;
the PWM generating circuit comprises a first PWM generating unit and a second PWM generating unit; the input end of the first PWM generating unit is connected with the output end of the first current loop, and the output end of the first PWM generating unit comprises driving signals PWM1 and PWM 2; the input end of the second PWM generating unit is connected with the output end of the second current loop, and the output end of the second PWM generating unit comprises driving signals PWM3 and PWM 4;
the bidirectional buck-boost circuit comprises a first unit circuit and a second unit circuit which share the input end of the direct-current bus; the first unit circuit is a bidirectional BUCK/BOOST circuit, the input end of the first unit circuit is respectively connected with the driving signals PWM1 and PWM2, and the output end of the first unit circuit is connected with the high end of the output power supply; the first unit circuit comprises a first capacitor C1, a first switch tube V1, a second switch tube V2, a first inductor L1 and a second capacitor C2, wherein the first capacitor C1, the first switch tube V1, the second switch tube V2, the first inductor L1 and the second capacitor C2 are connected between the high end of an output power supply and the ground; the grid electrode of the first switch tube V1 is connected with a driving signal PWM1, the drain electrode of the first switch tube V1 is connected with the input end of a direct current bus, and the source electrode of the first switch tube V2 is connected with the drain electrode of the second switch tube V2 and one end of a first inductor L1; the other end of the first inductor L1 is connected with the high end of the output power supply; the source electrode of the second switch tube V2 is grounded, and the grid electrode of the second switch tube V2 is connected with a driving signal PWM 2; the second unit circuit is a bidirectional BUCK-BOOST circuit, the input end of the second unit circuit is respectively connected with the driving signals PWM3 and PWM4, and the output end of the second unit circuit is connected with the low end of an output power supply; the second unit circuit comprises a third capacitor C3, a third switching tube V3, a fourth switching tube V4, a second inductor L2 and a fourth capacitor C4, wherein the third capacitor C3, the third switching tube V3, the fourth switching tube V4, the second inductor L2 and the fourth capacitor C4 are connected between the ground and the low end of the output power supply; the grid electrode of the third switch tube V3 is connected with a driving signal PWM3, the drain electrode of the third switch tube V3 is connected with the input end of the direct current bus, and the source electrode of the third switch tube V4 is connected with the drain electrode of the fourth switch tube V4 and one end of the second inductor L2; the other end of the second inductor L2 is grounded; the source of the fourth switching tube V4 is connected to the low end of the output power supply, and the gate is connected to the driving signal PWM 4.
5. The wide output range test power supply of claim 4, wherein: the maximum voltage borne by the first switching tube V1, the second switching tube V2, the third switching tube V3 and the fourth switching tube V4 is not greater than the voltage at the input end of the direct-current bus.
6. The wide output range test power supply of claim 5, wherein: the first switch tube V1, the second switch tube V2, the third switch tube V3 and the fourth switch tube V4 are all IGBTs or MOSFETs.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191884A (en) * | 2023-04-26 | 2023-05-30 | 深圳市恒运昌真空技术有限公司 | Boost-buck bidirectional converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191884A (en) * | 2023-04-26 | 2023-05-30 | 深圳市恒运昌真空技术有限公司 | Boost-buck bidirectional converter |
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