CN104467451A - Power source indication, voltage detection and electrolytic capacitor voltage-sharing circuit and control method - Google Patents
Power source indication, voltage detection and electrolytic capacitor voltage-sharing circuit and control method Download PDFInfo
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- CN104467451A CN104467451A CN201410706018.3A CN201410706018A CN104467451A CN 104467451 A CN104467451 A CN 104467451A CN 201410706018 A CN201410706018 A CN 201410706018A CN 104467451 A CN104467451 A CN 104467451A
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- Prior art keywords
- resistance
- voltage
- electric capacity
- module
- bus
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Classifications
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a power source indication, voltage detection and electrolytic capacitor voltage-sharing circuit and a control method. The circuit comprises a rectifier module, an inversion module, a control module, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor and a light-emitting diode. The output end of the rectifier module is connected with the input end of the inversion module through direct-current buses, and the control module is connected with the control end of the inversion module. The first capacitor and the second capacitor are connected in series and then are connected between the direct current buses. The first resistor, the second resistor, the light-emitting diode and the third resistor are connected in series and then are connected between the direct current buses. The connecting end of the first capacitor and the connecting end of the second capacitor are electrically connected with the connecting end of the first resistor and the connecting end of the second resistor. The connecting end of the light-emitting diode and the connecting end of the third resistor are electrically connected with the control module. By means of the power source indication, voltage detection and electrolytic capacitor voltage-sharing circuit and the control method, the number of the power resistors is reduced, the system power consumption and circuit cost are lowered, the area of a PCB is reduced, the wiring difficulty is lowered, and the system reliability is improved.
Description
Technical field
The present invention relates to a kind of circuit, more particularly, particularly a kind of power supply instruction, voltage detecting and electrochemical capacitor equalizer circuit and control method.
Background technology
Usually in friendship orthogonal transformation system, all there is DC energy storage filtration module, as frequency converter, UPS etc., be typical one shown in Fig. 1 and hand over orthogonal three phase mains transformation system internal electric schematic diagram, three-phase alternating current exports direct current after rectification module U1 rectification, as the input of inversion module after the energy storage filter circuit voltage stabilizing that this direct current is made up of electric capacity C1 and electric capacity C2, inversion module is modulated this direct current, output frequency and the variable three-phase alternating current of amplitude.
Because the busbar voltage after rectification is higher, bus capacitor needs the capacitances in series with multiple power is identical with model to use usually.But the voltage that the leakage current difference of electric capacity can cause each electric capacity to bear is inconsistent, if the voltage that each bus capacitor bears is seriously unbalanced, will greatly shortens the electric capacity life-span, electric capacity time serious, can be caused to burn.Therefore, bus capacitor is all pressed is necessary.On the electric capacity of each series connection, the power resistor of similar resistance in parallel is that the most frequently used one all presses mode, as shown in the resistance R1 in Fig. 1 and resistance R2.
Power supply power-on and power-off indicating circuit, for pointing out the charged situation of user's dc-link capacitance, improves the fail safe of user operation.Power indicating circuit is generally made up of (for meeting withstand voltage and power requirement, current-limiting resistance can be made up of several power resistor usually), as shown in the resistance R3 in Fig. 1, resistance R4 and LED1 current-limiting resistance series connection light-emitting diode.After powering on, direct voltage is added on resistance R3, resistance R4 and LED1, electric current will be had to flow through LED1 and make LED1 luminous.
The acquisition technique of DC bus-bar voltage is one of necessary condition realizing power conversion algorithm, the simplest acquisition mode is direct resistor voltage divider network in parallel on DC bus, and small-signal dividing potential drop obtained delivers to control module, as shown in the resistance R5 in Fig. 1, resistance R6, resistance R7.
Resistance R1 in equalizer circuit and resistance R2, the resistance R5 in the resistance R3 in power indicating circuit, resistance R4 and voltage collection circuit, resistance R6 are the power resistor that volume is comparatively large and cost is higher.Therefore the circuit shown in Fig. 1 also exists following shortcoming: use power resistor to add circuit cost first in a large number; Secondly power resistor will expend relatively high power, and circuit efficiency is reduced; Last power resistor volume is comparatively large, and is connected with high voltage with power resistor, pcb board must stay larger safety distance, occupy a large amount of PCB spaces, add PCB layout difficulty.
Summary of the invention
The object of the present invention is to provide the instruction of a kind of power supply, voltage detecting and electrochemical capacitor equalizer circuit, make it have and reduce system power dissipation and circuit cost, decrease the area taking PCB, reduce the wiring difficulty of technical staff, improve the function of system reliability.
In order to achieve the above object, the technical solution used in the present invention is as follows:
A kind of power supply instruction, voltage detecting and electrochemical capacitor equalizer circuit, comprise rectification module, inversion module, control module, the first electric capacity, the second electric capacity, the first resistance, the second resistance, the 3rd resistance and light-emitting diode;
The output of described rectification module is connected with the input of inversion module by DC bus, and described control module is connected with the control end of inversion module; Described first electric capacity and the second electric capacity are connected between DC bus after mutually connecting; Described first resistance, the second resistance, light-emitting diode and the 3rd resistance are connected between DC bus after mutually connecting; Be electrically connected between the link of described first electric capacity and the second electric capacity and the link of the first resistance and the second resistance; Be electrically connected between the link of described light-emitting diode and the 3rd resistance and control module.
Preferably, described first resistance, resistance value between the second resistance and the 3rd resistance meet formula: R
first resistance=R
second electricity resistance+ R
3rd resistance, and R
first resistance+ R
second resistance> > R
3rd resistance.
Preferably, described first resistance and the second resistance are power resistor, and described 3rd resistance is small-signal resistance.
The present invention also provides that a kind of above-mentioned power supply indicates, the control method of voltage detecting and electrochemical capacitor equalizer circuit, comprising:
Power supply instruction controls: when powering on, input AC electricity is through rectification module and the first electric capacity, the second electric capacity, obtain stable DC bus-bar voltage, DC bus-bar voltage is applied in the series arm of the first resistance, the second resistance, the 3rd resistance and light-emitting diode composition, the electric current produced flows through light-emitting diode, makes lumination of light emitting diode; During lower electricity, DC bus-bar voltage declines, and when dropping to certain limit, when the undercurrent that branch road flows through is to maintain LED operation, light-emitting diode extinguishes;
Voltage detecting controls: control module is carried out the protection of system according to the bus voltage signal collected and realized inversion algorithm, adjusts the pwm signal outputting to inversion module in real time, realize the modulation of output voltage according to busbar voltage;
Electrochemical capacitor Pressure and Control: when the voltage of the first electric capacity is greater than the voltage of the second electric capacity, because the resistance of grading resistor is equal, then the Electro-Static Discharge electric current of the first electric capacity will be greater than the second electric capacity, the voltage decreasing rate of the voltage increase rate of the first electric capacity and the second electric capacity is slowed down, is finally stabilized in a specific scope; When the voltage of the second electric capacity is greater than the voltage of the first electric capacity, because the resistance of grading resistor is equal, then the Electro-Static Discharge electric current of the second electric capacity will be greater than the first electric capacity, the voltage decreasing rate of the voltage increase rate of the second electric capacity and the first electric capacity is slowed down, is finally stabilized in a specific scope.
Preferably, in voltage detecting control procedure, also comprise by control R
first resistance+ R
second resistancewith R
3rd resistanceratio adjust the ratio of voltage detection signal and busbar voltage.
Compared with prior art, the invention has the advantages that: the present invention's use one group of power resistor simultaneously to achieve bus capacitor is all pressed, power supply power-on and power-off instruction and busbar voltage detect three kinds of functions, namely be integrated in the circuit of same road by being used for the power resistor that bus capacitor is all pressed, power supply indicates and bus detects, reduce the quantity using power resistor, reduce system power dissipation and circuit cost, decrease PCB area and reduce wiring difficulty, improve the reliability of system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is existing friendship orthogonal transformation system internal electric schematic diagram;
Fig. 2 is the electrical schematic diagram of power supply instruction, voltage detecting and bus capacitor equalizer circuit in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Consult shown in Fig. 2, the invention provides the instruction of a kind of power supply, voltage detecting and electrochemical capacitor equalizer circuit, comprise rectification module U1, inversion module U2, control module U3, the first electric capacity C1, the second electric capacity C2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and LED 1.
The output of described rectification module U1 is connected by the input of DC bus with inversion module U2, and described control module U3 is connected with the control end of inversion module U2; Be connected between DC bus after described first electric capacity C1 and the second electric capacity C2 connects mutually; Be connected between DC bus after described first resistance R1, the second resistance R2, LED 1 and the 3rd resistance R3 connect mutually; Be electrically connected between the link of described first electric capacity C1 and the second electric capacity C2 and the link of the first resistance R1 and the second resistance R2; Be electrically connected between the link of described LED 1 and the 3rd resistance R3 and control module U3.
Below principle of the present invention is described further:
Power supply instruction control procedure of the present invention is: when powering on, input AC electricity is through rectification module U1 and the first electric capacity C1, the second electric capacity C2 (being filter capacitor), obtain stable DC bus-bar voltage, DC bus-bar voltage is applied in the series arm of the first resistance R1, the second resistance R2, the 3rd resistance R3 and LED 1 composition, the electric current produced flows through LED 1, makes LED 1 luminous.During lower electricity, busbar voltage declines, and when dropping to certain limit, when the undercurrent that branch road flows through works to maintain LED 1, LED 1 extinguishes.
The control procedure that the bus capacitor of circuit of the present invention is all pressed is: realize (the forward pressure reduction of LED 1 is very little, can ignore the impact of bus uniform voltage) by the first resistance R1, the second resistance R2 (being power resistor) and the 3rd resistance R3 (small-signal resistance).Wherein value relatable meets, R
first resistance=R
second resistance+ R
3rd resistance(i.e. R1=R2+R3).The voltage un-balance of the first electric capacity C1, the second electric capacity C2 is that leakage current difference is larger because their leakage current difference causes, then the voltage difference of the first electric capacity C1, the second electric capacity C2 is larger.Suppose that the voltage of the first electric capacity C1 is greater than the voltage of the second electric capacity C2, because voltage sharing resistance value is equal, then the Electro-Static Discharge electric current of the first electric capacity C1 will be greater than the second electric capacity C2, the voltage decreasing rate of the voltage increase rate of the first electric capacity C1 and the second electric capacity C2 is slowed down, is finally stabilized in a specific scope.When supposing that the voltage of the second electric capacity C2 is greater than the voltage of the first electric capacity C1, because the resistance of grading resistor is equal, then the Electro-Static Discharge electric current of the second electric capacity C2 will be greater than the first electric capacity C1, the voltage decreasing rate of the voltage increase rate of the second electric capacity C2 and the first electric capacity C1 is slowed down, is finally stabilized in a specific scope.By selecting suitable resistance, circuit can be made to obtain all pressing effect preferably.
The control procedure that the busbar voltage of circuit of the present invention detects is: realized (the forward pressure reduction of LED 1 is very little, can ignore the impact that busbar voltage detects) by the first resistance R1, the second resistance R2 and the 3rd resistance R3.Vsense is the voltage detection signal sending into control module U3, and usual R1+R2 is far longer than R3 (i.e. R
first resistance+ R
second resistance> > R
3rd resistance, or R1+R2 > > R3), Vsense is the voltage signal being less than 5V.By the ratio of the adjustment resistance of R1+R2 and the resistance of R3, with regard to the ratio of adjustable Vsense and busbar voltage.Control module U3 carries out the protection of system according to the bus voltage signal collected and realizes inversion algorithm, adjusts the pwm signal outputting to inversion module U2 in real time, realize the modulation of output voltage according to busbar voltage.
In the present invention, if power resistor R1, R2 can adopt the form of the serial or parallel connection of thousand power resistors according to the needs of side circuit.
Above a kind of power supply instruction provided by the present invention, voltage detecting and capacitor voltage equalizing circuit are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (5)
1. power supply instruction, voltage detecting and an electrochemical capacitor equalizer circuit, is characterized in that: comprise rectification module, inversion module, control module, the first electric capacity, the second electric capacity, the first resistance, the second resistance, the 3rd resistance and light-emitting diode;
The output of described rectification module is connected with the input of inversion module by DC bus, and described control module is connected with the control end of inversion module; Described first electric capacity and the second electric capacity are connected between DC bus after mutually connecting; Described first resistance, the second resistance, light-emitting diode and the 3rd resistance are connected between DC bus after mutually connecting; Be electrically connected between the link of described first electric capacity and the second electric capacity and the link of the first resistance and the second resistance; Be electrically connected between the link of described light-emitting diode and the 3rd resistance and control module.
2. power supply according to claim 1 instruction, voltage detecting and electrochemical capacitor equalizer circuit, is characterized in that: described first resistance, resistance value between the second resistance and the 3rd resistance meet formula: R
first resistance=R
second resistance+ R
3rd resistance, and R
first resistance+ R
second resistance>>R
3rd resistance.
3. power supply instruction according to claim 1, voltage detecting and electrochemical capacitor equalizer circuit, it is characterized in that: described first resistance and the second resistance are power resistor, described 3rd resistance is small-signal resistance.
4. the power supply instruction according to claims 1 to 3 any one, the control method of voltage detecting and electrochemical capacitor equalizer circuit, is characterized in that: comprise,
Power supply instruction controls: when powering on, input AC electricity is through rectification module and the first electric capacity, the second electric capacity, obtain stable DC bus-bar voltage, DC bus-bar voltage is applied in the series arm of the first resistance, the second resistance, the 3rd resistance and light-emitting diode composition, the electric current produced flows through light-emitting diode, makes lumination of light emitting diode; During lower electricity, DC bus-bar voltage declines, and when dropping to certain limit, when the undercurrent that branch road flows through is to maintain LED operation, light-emitting diode extinguishes;
Voltage detecting controls: control module is carried out the protection of system according to the bus voltage signal collected and realized inversion algorithm, adjusts the pwm signal outputting to inversion module in real time, realize the modulation of output voltage according to busbar voltage;
Electrochemical capacitor Pressure and Control: when the voltage of the first electric capacity is greater than the voltage of the second electric capacity, because the resistance of grading resistor is equal, then the Electro-Static Discharge electric current of the first electric capacity will be greater than the second electric capacity, the voltage decreasing rate of the voltage increase rate of the first electric capacity and the second electric capacity is slowed down, is finally stabilized in a specific scope; When the voltage of the second electric capacity is greater than the voltage of the first electric capacity, because the resistance of grading resistor is equal, then the Electro-Static Discharge electric current of the second electric capacity will be greater than the first electric capacity, the voltage decreasing rate of the voltage increase rate of the second electric capacity and the first electric capacity is slowed down, is finally stabilized in a specific scope.
5. control method according to claim 4, is characterized in that: in voltage detecting control procedure, also comprises by control R
first resistance+ R
second resistancewith R
3rd resistanceratio adjust the ratio of voltage detection signal and busbar voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706018.3A CN104467451A (en) | 2014-11-28 | 2014-11-28 | Power source indication, voltage detection and electrolytic capacitor voltage-sharing circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706018.3A CN104467451A (en) | 2014-11-28 | 2014-11-28 | Power source indication, voltage detection and electrolytic capacitor voltage-sharing circuit and control method |
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| Publication Number | Publication Date |
|---|---|
| CN104467451A true CN104467451A (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410706018.3A Pending CN104467451A (en) | 2014-11-28 | 2014-11-28 | Power source indication, voltage detection and electrolytic capacitor voltage-sharing circuit and control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515381A (en) * | 2016-01-27 | 2016-04-20 | 南京能瑞电力科技有限公司 | Multi-level converter direct-current side voltage balancing circuit |
| CN106124844A (en) * | 2016-07-15 | 2016-11-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of direct current bus voltage detecting circuit |
| CN106972451A (en) * | 2017-05-23 | 2017-07-21 | 湖南晟和电子技术有限公司 | Novel power supply protection circuit, guard method and its measuring instrument being made |
| CN110071623A (en) * | 2019-01-16 | 2019-07-30 | 广东美的制冷设备有限公司 | Drive control circuit, air-conditioner controller and air conditioner |
| CN113794384A (en) * | 2021-09-10 | 2021-12-14 | 珠海格力电器股份有限公司 | Capacitor voltage control device and method and motor control equipment |
-
2014
- 2014-11-28 CN CN201410706018.3A patent/CN104467451A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515381A (en) * | 2016-01-27 | 2016-04-20 | 南京能瑞电力科技有限公司 | Multi-level converter direct-current side voltage balancing circuit |
| CN106124844A (en) * | 2016-07-15 | 2016-11-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of direct current bus voltage detecting circuit |
| CN106124844B (en) * | 2016-07-15 | 2018-11-30 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of direct current bus voltage detecting circuit |
| CN106972451A (en) * | 2017-05-23 | 2017-07-21 | 湖南晟和电子技术有限公司 | Novel power supply protection circuit, guard method and its measuring instrument being made |
| CN110071623A (en) * | 2019-01-16 | 2019-07-30 | 广东美的制冷设备有限公司 | Drive control circuit, air-conditioner controller and air conditioner |
| CN113794384A (en) * | 2021-09-10 | 2021-12-14 | 珠海格力电器股份有限公司 | Capacitor voltage control device and method and motor control equipment |
| CN113794384B (en) * | 2021-09-10 | 2023-09-29 | 珠海格力电器股份有限公司 | Capacitor voltage control device and method and motor control equipment |
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Application publication date: 20150325 |