CN203504447U - Constant-current current-limiting type inverter - Google Patents
Constant-current current-limiting type inverter Download PDFInfo
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- CN203504447U CN203504447U CN201320351392.7U CN201320351392U CN203504447U CN 203504447 U CN203504447 U CN 203504447U CN 201320351392 U CN201320351392 U CN 201320351392U CN 203504447 U CN203504447 U CN 203504447U
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Abstract
The utility model discloses a constant-current current-limiting type inverter, comprising a booster for improving voltage of direct current, a rectification filtering device, an H bridge circuit used for converting direct current output by the booster into alternating current, a sampling module used for sampling alternating current output by the H bridge circuit and rectifying the sample current into a voltage value signal IS corresponding to voltage of an output end of the H bridge circuit and invariable in direction, a comparison module configured with a highest threshold and a lowest threshold, and an MCU for controlling the opening or closing of the H bridge circuit according to output of the comparison module. The beneficial effects are that a problem that a starting property of the H bridge circuit is affected as performances of short circuit protection and overload protection are changed is solved, the constant-current current-limiting type inverter is simple in structure, low in cost, short in development period and stable in current output, and the constant-current current-limiting type inverter can be applied to large-power electrical appliances.
Description
Technical field
The utility model relates to a kind of power supply changeover device, relates in particular to a kind of constant current current-limiting type inverter.
Background technology
Inverter is a kind of device that direct current energy is transformed into alternating current, and existing inverter can be divided into based on 8 MCU and carry out open loop control type inverter according to control mode, and based on two kinds of the complicated many closed-loop controls type of DSP inverters; DSP changes control type inverter more, and control procedure is complicated, stable output, and startup ability is strong, but its implementation procedure is complicated, and the construction cycle is long, and cost is relatively high; Use 8 MCU as core, to control the inverter of IC; realize simple; cost is low; but in the time of on for high-power electric appliance; if will normally export larger electric current; to make the performance such as short-circuit protection, overload protection of inverter occur degradation, if will guarantee the performance such as short-circuit protection, overload protection of inverter, will have a strong impact on the normal output of electric current.
Utility model content
For the existing defect of above-mentioned prior art, when the performances such as a kind of short-circuit protection that is intended to guarantee inverter and overload protection are now provided, can also normally export larger electric current, and constant current current-limiting type inverter simple in structure, with low cost.
A constant current current-limiting type inverter, for by converting direct-current power into alternating-current power, includes:
Stepup transformer, for improving galvanic voltage;
H bridge circuit, is provided with straightening and filtering unit, and the converting direct-current power into alternating-current power for stepup transformer is exported;
Sampling module, for the current sample to the alternating current of H bridge circuit output, and is rectified into the voltage voltage value signal corresponding and that direction is constant of exporting with H bridge circuit;
Comparison module, is set with high threshold and lowest threshold, and whether the voltage that comparison module judges the output of H bridge circuit according to voltage value signal is between high threshold and lowest threshold; And,
MCU(Micro Control Unit, micro-control unit), according to the output of comparison module, control the unlatching of H bridge circuit or close.
Above-mentioned constant current current-limiting type inverter, wherein, sampling module includes full bridge rectifier, and for the instrument transformer to the current sample of the alternating current of H bridge circuit output; The electric current that instrument transformer obtains sampling is sent to full bridge rectifier, exports the voltage voltage value signal corresponding and that direction is constant with H bridge circuit output after full bridge rectifier rectification; Full bridge rectifier is for to form by four mutual bridge joints of diode.
Above-mentioned constant current current-limiting type inverter, wherein, comparison module includes the first comparator and the second comparator; "+" end of the first comparator is connected with the first adjusting device, for regulating the high threshold of comparison module; "-" end of the second comparator is connected with the second adjusting device, for regulating the lowest threshold of comparison module; The first adjusting device includes voltage source and the regulating resistance for regulating "+" of the first comparator to hold; The second adjusting device includes voltage source and the regulating resistance for regulating the second comparator "-" to hold; Voltage value signal is inputted respectively "-" end of the first comparator and "+" end of the second comparator.
Above-mentioned constant current current-limiting type inverter, wherein, MCU has the first receiving terminal and the second receiving terminal, and the first comparator and the second comparator are exported convertible level to the first receiving terminal and the second receiving terminal respectively; MCU also has the first output and the second output, and the first output is connected with H bridge circuit respectively with the second output, for H bridge circuit being opened or closed according to the level of the first comparator and the output of the second comparator; H bridge circuit has SPWM drive system, and the first output and the second output, by controlling the startup of SPWM drive system or closing, make H bridge circuit start or close.
Above-mentioned constant current current-limiting type inverter, wherein, stepup transformer is push pull voltage booster.
Above-mentioned constant current current-limiting type inverter, wherein, MCU is the MCU of 8.
The beneficial effect of technique scheme is:
1, by utilizing sampling module to sample to the electric current of the alternating current of H bridge circuit output, and by comparison module, the corresponding voltage of electric current of sampling is judged, and then the operation of H bridge circuit being opened or being closed by MCU, played the effect of size of current of the alternating current of automatic control H bridge circuit output, optimize the control mode of MCU, realized the output of inverter continuation constant current current limliting; Also avoided owing to affecting the situation of the startup ability of H bridge circuit by changing the performance of short-circuit protection and overload protection simultaneously, and then be conducive to the whole startup ability that improves short-circuit protection ability, overload protection ability and the H bridge circuit of inverter.
2, the disclosed constant current current-limiting type of the technical program inverter also has the advantages such as simple in structure, cost is low, the construction cycle is short; And electric current stable output, and can on high-power electric appliance, use.
3, by regulating the scope of the current value of the alternating current that high threshold adjusting device and lowest threshold adjusting device can export H bridge circuit to regulate.
Accompanying drawing explanation
Fig. 1 is a kind of electrical block diagram of constant current current-limiting type inverter.
Reference numeral:
1, stepup transformer
2, H bridge circuit
3, sampling module
31, full bridge rectifier
4, comparison module
41, the first comparator
42, the second comparator
5、MCU
51, the first receiving terminal
52, the second receiving terminal
53, the first output
54, the second output
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
A constant current current-limiting type inverter as shown in Figure 1, for by converting direct-current power into alternating-current power, includes:
Stepup transformer 1, for improving galvanic voltage;
H bridge circuit 2, is provided with straightening and filtering unit, and the converting direct-current power into alternating-current power for stepup transformer is exported;
Sampling module 3, for the current sample to the alternating current of H bridge circuit 2 outputs, and is rectified into the voltage voltage value signal corresponding and that direction is constant of exporting with H bridge circuit 2;
Comparison module 4, is set with high threshold and lowest threshold, and whether the voltage that comparison module 4 judges 2 outputs of H bridge circuit according to voltage value signal is between high threshold and lowest threshold; And,
MCU(Micro Control Unit, micro-control unit) 5, according to the output of comparison module 4, control the unlatching of H bridge circuit 2 or close.
The operation principle of technique scheme is: the electric current of the alternating current of exporting by 3 pairs of H bridge circuits 2 of sampling module is sampled, the current commutates again sampling being obtained becomes the voltage value signal IS corresponding with the voltage of H bridge circuit 2 outputs, and this voltage value signal IS is sent to comparison module 4; Comparison module 4 is provided with high threshold and lowest threshold, and transmits signal to MCU5, makes MCU5 according to the signal receiving, H bridge circuit 2 be opened or be closed.
On the basis of technique scheme, further, sampling module 3 includes full bridge rectifier 31, and for the instrument transformer T1 to the current sample of the alternating current of H bridge circuit 2 outputs; The electric current that instrument transformer T1 obtains sampling is sent to full bridge rectifier 31, exports the voltage voltage value signal IS corresponding and that direction is constant with H bridge circuit 2 outputs after full bridge rectifier 31 rectifications.
On the basis of technique scheme, further, comparison module 4 includes the first comparator 41 and the second comparator 42; "+" end of the first comparator 41 is connected with the first adjusting device, for regulating the high threshold of comparison module 4; "-" end of the second comparator 42 is connected with the second adjusting device, for regulating the lowest threshold of comparison module 4; The first adjusting device includes voltage source E1 and regulating resistance R1 and R2 for regulating "+" of the first comparator 41 to hold; The second adjusting device includes voltage source E2 and regulating resistance R3 and R4 for regulating the second comparator 42 "-" to hold; Wherein, the voltage of voltage source E1 and voltage source E2 is constant, by regulating the resistance of regulating resistance R1, R2, R3, R4 to change the voltage of the first comparator 41 "+" end and the second comparator 42 "-" end, and then regulate the high threshold of comparison module 4 and the numerical value of lowest threshold, to regulate the scope of the current output value of H bridge circuit 2.
Further, voltage value signal IS is input to respectively "-" end of the first comparator 41 and "+" end of the second comparator 42.
On the basis of technique scheme, further, MCU5 has the first receiving terminal 51 and the second receiving terminal 52, the first comparators 41 and the second comparator 42 respectively to the first receiving terminal 51 and the convertible level of the second receiving terminal 52 output; MCU5 also has the first output 53 and the second output 54, the first outputs 53 are connected with H bridge circuit 2 respectively with the second output 54, for H bridge circuit 2 being opened or closed according to the level of the first comparator 41 and the second comparator 42 outputs; H bridge circuit 2 has SPWM(Sinusoidal Pulse Width Modulation, sinusoidal pulses width modulated) drive system, the first output 53 and the second output 54, by controlling the startup of SPWM drive system or closing, make H bridge circuit 2 start or close; Wherein, when voltage value signal IS is during lower than lowest threshold, the first comparator 41 is to the first receiving terminal 51 output high level, and the second comparator 42 is to the second receiving terminal 52 output low levels, and now MCU5 carries out start-up operation to H bridge circuit 2; When voltage value signal IS is between high threshold and lowest threshold, the first comparator 41 is to the first receiving terminal 51 output high level, and the second comparator 42 is to the second receiving terminal 52 output high level, and MCU5 keeps now operating constant to H bridge circuit 2; When voltage value signal IS is greater than high threshold, the first comparator 41 is to the first receiving terminal 51 output low levels, and the second comparator 42 is to the second receiving terminal 52 output high level, and now MCU5 carries out shutoff operation to H bridge circuit 2.
Further, when the output of H bridge circuit 2 does not have electric current output, its voltage value signal IS is zero, and now MCU5 carries out open operation to H bridge circuit 2; When the electric current of the output of H bridge circuit 2 increases, while making voltage value signal IS rise between high threshold and lowest threshold, it is constant that MCU5 is held open operation to H bridge circuit 2; When the electric current of the output of H bridge circuit 2 continues to increase, cause voltage value signal IS to rise to high threshold when above, MCU5 carries out shutoff operation to H bridge circuit 2; Due to H bridge circuit 2, close the output end current of H bridge circuit 2 is declined, while causing voltage value signal IS to drop between high threshold and lowest threshold, MCU5 keeps shutoff operations constant to H bridge circuit 2; When the output end current of H bridge circuit 2 continues to decline, while causing voltage value signal IS to decline to cause lowest threshold following, MCU5 carries out open operation to H bridge circuit 2.
Optionally, stepup transformer 1 is push pull voltage booster.
Optionally, MCU5 is 8 MCU5.
The utility model is by utilizing sampling module to sample to the electric current of the alternating current of H bridge circuit output, and by comparison module, the corresponding voltage of electric current of sampling is judged, and then the operation of H bridge circuit being opened or being closed by MCU, played the effect of size of current of the alternating current of automatic control H bridge circuit output, optimize the control mode of MCU, realized the output of inverter continuation constant current current limliting; Also avoided owing to affecting the situation of the startup ability of H bridge circuit by changing the performance of short-circuit protection and overload protection simultaneously, and then be conducive to the whole startup ability that improves short-circuit protection ability, overload protection ability and the H bridge circuit of inverter.
The foregoing is only the utility model preferred embodiment; not thereby limit execution mode of the present utility model and protection range; to those skilled in the art; should recognize that being equal to that all utilization the utility model specifications and diagramatic content done replace and the resulting scheme of apparent variation, all should be included in protection range of the present utility model.
Claims (10)
1. a constant current current-limiting type inverter, for by converting direct-current power into alternating-current power, is characterized in that, includes:
Stepup transformer, for improving described galvanic voltage;
H bridge circuit, is provided with straightening and filtering unit, and the converting direct-current power into alternating-current power for described stepup transformer is exported;
Sampling module, for the current sample to the alternating current of described H bridge circuit output, and is rectified into the voltage voltage value signal corresponding and that direction is constant of exporting with described H bridge circuit;
Comparison module, is set with high threshold and lowest threshold, and whether the voltage that described comparison module judges described H bridge circuit output according to described voltage value signal is between described high threshold and described lowest threshold; And,
MCU, controls the unlatching of described H bridge circuit or closes according to the output of described comparison module.
2. constant current current-limiting type inverter as claimed in claim 1, is characterized in that, described sampling module includes full bridge rectifier, and for the instrument transformer to the current sample of the alternating current of described H bridge circuit output; The electric current that described instrument transformer obtains sampling is sent to described full bridge rectifier, exports the voltage voltage value signal corresponding and that direction is constant with described H bridge circuit output after described full bridge rectifier rectification.
3. constant current current-limiting type inverter as claimed in claim 2, is characterized in that, described full bridge rectifier is for to form by four mutual bridge joints of diode.
4. constant current current-limiting type inverter as claimed in claim 1, is characterized in that, described comparison module includes the first comparator and the second comparator; "+" end of described the first comparator is connected with the first adjusting device, for regulating the high threshold of described comparison module; "-" end of described the second comparator is connected with the second adjusting device, for regulating the lowest threshold of described comparison module.
5. constant current current-limiting type inverter as claimed in claim 4, is characterized in that, described the first adjusting device includes voltage source and for regulating the regulating resistance of "+" end of described the first comparator; Described the second adjusting device includes voltage source and the regulating resistance for regulating described the second comparator "-" to hold; Described voltage value signal is inputted respectively "-" end of described the first comparator and "+" end of described the second comparator.
6. constant current current-limiting type inverter as claimed in claim 5, it is characterized in that, described MCU has the first receiving terminal and the second receiving terminal, and described the first comparator and described the second comparator are exported convertible level to described the first receiving terminal and described the second receiving terminal respectively.
7. constant current current-limiting type inverter as claimed in claim 6, it is characterized in that, described MCU also has the first output and the second output, described the first output is connected with described H bridge circuit respectively with described the second output, for described H bridge circuit being opened or closed according to the level of described the first comparator and described the second comparator output.
8. constant current current-limiting type inverter as claimed in claim 7, it is characterized in that, described H bridge circuit has SPWM drive system, and described the first output and described the second output, by controlling the startup of described SPWM drive system or closing, make described H bridge circuit start or close.
9. constant current current-limiting type inverter as claimed in claim 1, is characterized in that, described stepup transformer is push pull voltage booster.
10. constant current current-limiting type inverter as described in any one in claim 1-9, is characterized in that, described MCU is the MCU of 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320351392.7U CN203504447U (en) | 2013-06-18 | 2013-06-18 | Constant-current current-limiting type inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320351392.7U CN203504447U (en) | 2013-06-18 | 2013-06-18 | Constant-current current-limiting type inverter |
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| Publication Number | Publication Date |
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| CN203504447U true CN203504447U (en) | 2014-03-26 |
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| CN201320351392.7U Expired - Fee Related CN203504447U (en) | 2013-06-18 | 2013-06-18 | Constant-current current-limiting type inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242703B (en) * | 2013-06-18 | 2017-05-17 | 纽福克斯光电科技（上海）有限公司 | Constant-current current-limiting inverter |
| WO2021077685A1 (en) * | 2019-10-25 | 2021-04-29 | 深圳可立克科技股份有限公司 | Dc-ac correction wave inverter having output short circuit protection circuit |
-
2013
- 2013-06-18 CN CN201320351392.7U patent/CN203504447U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242703B (en) * | 2013-06-18 | 2017-05-17 | 纽福克斯光电科技（上海）有限公司 | Constant-current current-limiting inverter |
| WO2021077685A1 (en) * | 2019-10-25 | 2021-04-29 | 深圳可立克科技股份有限公司 | Dc-ac correction wave inverter having output short circuit protection circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20140618 |
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| EXPY | Termination of patent right or utility model |