CN203747654U - DC-DC converter with input voltage compensation circuit - Google Patents
DC-DC converter with input voltage compensation circuit Download PDFInfo
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- CN203747654U CN203747654U CN201420068772.4U CN201420068772U CN203747654U CN 203747654 U CN203747654 U CN 203747654U CN 201420068772 U CN201420068772 U CN 201420068772U CN 203747654 U CN203747654 U CN 203747654U
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Abstract
The utility model is titled as a DC-DC converter with an input voltage compensation circuit and relates to a DC-DC converter capable of converting a direct-current voltage into other direct-current voltages. Therefore, a problem that the manufacturing cost and the using cost of the DC-DC converter are increased because the conventional DC-DC converter has the high output pulse and needs configuration of the inverter loop and the semiconductor operational amplifier and the like can be solved. According to the scheme, in the DC-DC converter circuit, a voltage state measuring circuit or a current state measuring circuit is arranged at a primary side of a transformer; a main switching element is connected in series to a primary winding of the transformer; and a correction circuit in the voltage state measuring circuit or the current state measuring circuit and a control terminal of the main switching element are connected to an output terminal of a driving circuit. An output state of a transformer secondary side is detected and the output voltage of the transformer secondary side is corrected, so that the transformer secondary side can output the stable direct-current voltage. Moreover, the provided DC-DC converter has advantages of simple structure, low cost, easy implementation, and small occupied space.
Description
Technical field
The utility model relates to a kind of DC-DC transducer with input voltage compensation circuit, concrete relates to a kind of DC-DC transducer that on power electronic equipment, direct voltage is converted to other direct voltage that is applied in.
Background technology
DC-DC transducer is called again Switching Power Supply or switch adjuster, is generally made up of control chip, inductance coil, diode, triode, capacitor.It can convert a direct voltage to other direct voltage,
DC-DC transducer is because its low quiescent current, high efficiency, volume are little and the advantage such as large electric current is widely used in various electronic equipments.Because conventional DC-DC transducer output ripple is larger, for addressing this problem and needing to configure other complicated circuit, as: inverter loop, semiconductor amplifier etc., these additional circuit significantly increase the manufacturing cost of DC-DC transducer and use cost, occupy again huge space, limited greatly the promotion and application of DC-DC transducer simultaneously.
The basic technology of existing DC-DC transducer is pulse modulation technique, and major control mode is divided into three kinds: PWM controls, PFM controls, PWM/PFM conversion and control.According to the demand difference of DC-DC transducer, adopt different control modes, and the defect of bringing for its control mode is carried out calibration and compensation targetedly.The patent of invention " the former limit feedback inverse-excitation type constant-current supply of tape input voltage compensation " of Chengdu Chengdian Guihai Science & Technology Co., Ltd.'s application, it comprises controller, MOSFET(metal oxide semiconductor field effect tube, the one of metal-oxide-semiconductor), current feedback resistance, transformer, diode, output capacitance, comparator etc.Because main circuit adopts flyback transformer circuit, therefore its output voltage ripple is larger, for the problems referred to above, this patent proposes the compensation way compensation input voltage of a kind of reaction type, and then ensure that its output current keeps constant, its embodiment as shown in Figure 1, under the prerequisite of the system delay time of known (obtaining by calculating or testing) this circuit (Δ is t) Lp with transformer primary side inductance 4(inductance value), controlling the first resistance 21(resistance value is Rout), current feedback resistance 3(resistance value is Rcs), the 4th resistance 24(resistance value is Rin) resistance value, make it meet equation
.
The patent of invention " ON-OFF control circuit and self-excited DC-DC converter " of Osaka, Japan Sanyo Electric Co., Ltd application; design a kind of self-excited DC-DC converter, mainly comprised: switch element, ON-OFF control circuit, smoothing circuit, switch control signal generating circuit, output correction circuit, overcurrent protection signal generating circuit, delay circuit etc.By means of the feedback voltage and the reference voltage that obtain by feedback output resistance are compared, detect the variation of the ripple of output voltage, and produce a level controling signal for control switch element, control the conduction and cut-off of two nmos pass transistors by controlling PWM, realize the rectification building-out of input voltage.Above-mentioned two DC-DC transducers, still exist output ripple large, need to configure complicated subsidiary circuit and correcting circuit, make circuit structure complexity, need a large amount of components and parts, and cost is higher.
Summary of the invention
The purpose of this utility model is for above-mentioned deficiency, and a kind of output ripple proposing is little, and circuit structure is simple, and the components and parts that need are few, the DC-DC transducer of what cost was low have input voltage compensation circuit.
Technical solution of the present utility model is: in this DC-DC converter circuit, voltage status measuring circuit or current status measuring circuit are located at the primary side of transformer, main switch element is connected on the armature winding of transformer, and the correcting circuit in voltage status measuring circuit or current status measuring circuit and the control terminal of main switch element are all connected on the output of drive circuit.
Correcting circuit described in technical solution of the present utility model is made up of resistor and capacitor's series, and correcting circuit is connected on the output of drive circuit by resistor.
Voltage status measuring circuit described in technical solution of the present utility model comprises correcting circuit, boost voltage output circuit, voltage detecting circuit and comparison circuit, voltage detecting circuit is made up of two resistor in series, the output of one termination boost voltage output circuit of voltage detecting circuit, the other end of voltage detecting circuit is connected on the resistor of correcting circuit and the node of capacitor's series, the series connection node of two resistors in voltage detecting circuit connects the negative input end of comparison circuit, the positive input terminal of comparison circuit is connected with the power supply that reference voltage is provided.
Current status measuring circuit described in technical solution device of the present utility model comprises correcting circuit, voltage detecting circuit and comparison circuit, one end of the voltage detecting circuit being made up of two resistor in series is connected on the node between main switch element and current sensing resistor, the other end of voltage detecting circuit is connected on the resistor of correcting circuit and the node of capacitor's series, the series connection node of two resistors in voltage detecting circuit connects the negative input end of comparison circuit, and the positive input terminal of comparison circuit is connected with the power supply that reference voltage is provided.
The utility model provides the drive circuit for generation of PWM driving pulse, and its output is connected on the control end of main switch element, and the output voltage of correcting circuit is inversely proportional to the input voltage providing.Therefore,, according to the level and smooth PWM driving pulse voltage that is connected to the drive circuit generation on main switch element, can revise by correcting circuit the output valve of boost voltage output circuit; Therefore, can carry out by proofreading and correct input voltage with a simple circuit output voltage of stabilizing transformer primary side, need to not have state measurement circuit in transformer secondary; The utility model can be applied to the indirect control of output voltage and proofread and correct, and measures overvoltage or overcurrent etc.; DC-DC transducer of the present utility model is owing to being the state measurement circuit that has increased a bag circuit in common DC-DC converter circuit, by detecting the output state of transformer secondary, ripple to transformer secondary output voltage is proofreaied and correct, and makes the direct voltage that transformer secondary can stable output; Therefore compared with existing DC-DC converter circuit, the utlity model has simple in structure, cost is low, easy realization, the advantage such as little takes up room.
Brief description of the drawings
Fig. 1 is the electrical schematic diagram of known technology.
Fig. 2 is an embodiment electrical schematic diagram of the present utility model.
Fig. 3 is another embodiment electrical schematic diagram of the present utility model.
Embodiment
As shown in Figure 2,3, DC-DC(DC-to-DC of the present utility model) transducer comprises: the transformer 1 of primary side and primary side mutual insulating, there is PWM(pulse width modulation) control main switch element 2, main switch element 2 adopts metal oxide semiconductor field effect tube MOSFET, for generation of the drive circuit 3 of pwm pulse, control voltage status measuring circuit 5 or the current status measuring circuit 6 of correcting circuit 4; The secondary winding of transformer 1 is connected with power-switching circuit, and power-switching circuit is made up of diode 21, resistance 22 and electric capacity 23; Voltage status measuring circuit 5 or current status measuring circuit 6 are located at the primary side of transformer 1, can be at the state of indirect measuring transformer 1 primary side of primary side; Main switch element 2 is connected on the armature winding of transformer 1, and the control terminal of main switch element 2 is connected with the output of drive circuit 3, and main switch element 2 carries out PWM control to switching circuit, so that the output voltage of stabilizing transformer 1 primary side; Correcting circuit 4 is made up of resistor 11 and capacitor 12 series circuits, and correcting circuit 4 is connected on the output of drive circuit 3 by resistor 11.
Fig. 2 is an embodiment of the present utility model, this embodiment is Bian voltage status measuring circuit 5, the voltage status measuring circuit 5 that is located at transformer 1 primary side comprises boost voltage output circuit 7, voltage detecting circuit 8, correcting circuit 4, comparison circuit 9, boost voltage output circuit 7 is by an auxiliary winding, rectifier cell 13, out put reactor 14 and filtering capacitor 15 form, the auxiliary winding of boost voltage output circuit 7 is in the primary side of transformer 1, out put reactor 14 and filtering capacitor 15 are for the voltage of level and smooth auxiliary winding, so that the ratio of the output voltage of change-over circuit and boost voltage output circuit and the primary side winding of the transformer 1 and turn ratio of auxiliary winding is directly proportional, the output of boost voltage output circuit 7 is connected with voltage detecting circuit 8, the output voltage of auxiliary winding can be measured by voltage detecting circuit 8 after boost voltage output circuit 7 is level and smooth, voltage detecting circuit 8 is made up of two resistor in series, one end of voltage detecting circuit 8 is connected with boost voltage output circuit 7, the other end is connected on the resistor 11 of correcting circuit 4 and the series connection node of capacitor 12, series connection node between two resistors of voltage detecting circuit 8 connects the negative input end of comparison circuit 9, the positive input terminal of comparator 9 is connected with the power supply that reference voltage is provided.
Operation principle: a pulse drive signal of being controlled by PWM, be sent to main switch element 2 from drive circuit 3, main switch element 2 is alternately turned on and off, electric current flows through at the armature winding of transformer 1; In the time that the armature winding of transformer 1 has electric current to flow through, electric current also flows through secondary winding and the auxiliary winding of transformer 1; The capacitor 12 that the drive pulse signal of being controlled by PWM sending from drive circuit 3 is correcting circuit 4 by the resistor 11 of correcting circuit 4 charges; When the signal of drive circuit 3 is set to on-state, the voltage of correcting circuit 4 increases gradually, when the signal of drive circuit 3 is set to off state, capacitor 12 discharges, the voltage of correcting circuit 4 is reduced gradually, the increase of voltage and minimizing are alternately repeated, and the waveform of output voltage of correcting circuit 4 and the average pulse signal of drive circuit 3 are approached; In the time that PWM control is performed, input voltage (being Vin) is higher, and it is just shorter that the pulse signal of drive circuit 3 is placed in the time of " connection "; Otherwise input voltage is lower, it is just longer that the pulse signal of drive circuit 3 is placed in time of " shutoff "; That is, in the time that input voltage is higher, the average voltage of correcting circuit 4 is low, otherwise when input voltage is low, the average voltage of correcting circuit 4 is higher; Therefore, the output voltage of correcting circuit 4 and input voltage are inversely proportional to.In the present embodiment, in the time that input voltage increases, the output voltage of correcting circuit 4 reduces, the incoming level of the negative terminal of comparison circuit 9 remains unchanged, proofread and correct by output voltage detecting circuit 8 and correcting circuit 4, the auxiliary winding of boost voltage output circuit 7 will produce one and respond to the magnetic induction line of magnetic induction line opposite direction with transformer 1 primary side winding, thereby makes not change by the magnetic flux of transformer 1 primary side winding; Otherwise, in the time that input voltage reduces, the output voltage of correcting circuit 4 increases, the incoming level of the negative terminal of comparison circuit 9 remains unchanged, proofread and correct by output voltage detecting circuit 8 and correcting circuit 4, the auxiliary winding of boost voltage output circuit 7 will produce a magnetic induction line identical with transformer 1 primary side winding induction magnetic induction line direction, thereby makes not change by the magnetic flux of primary side winding.Therefore the output voltage of the auxiliary winding of primary side keeps constant.In the present embodiment, in the time that input voltage increases, the output voltage of correcting circuit 4 reduces, and the output voltage of boost voltage output circuit 7 is directly proportional to input voltage, proofread and correct by output voltage detecting circuit 8 and correcting circuit 4, thereby the incoming level of the negative terminal of comparison circuit 9 is remained unchanged.
Fig. 3 is in another embodiment of the present utility model, between main switch element 4 and input voltage negative terminal, be connected with a current sensing resistor 16, the current status measuring circuit 6 that is located at transformer 1 primary side is connected on the node between main switch element 2 and current sensing resistor 16, the effect of current sensing resistor 16 is to convert input current to can be detected by current status measuring circuit 6 magnitude of voltage, current status measuring circuit 6 comprises correcting circuit 4, voltage detecting circuit 8 and comparison circuit 9, voltage detecting circuit 8 is made up of two resistors in seriess, one end of voltage detecting circuit 8 is connected on the connected node between main switch element 2 and current sensing resistor 16, the other end of voltage detecting circuit 8 is connected on the resistor 11 of correcting circuit 4 and the series connection node of capacitor 12, series connection node between two resistors of voltage detecting circuit 8 connects the negative input end of comparison circuit 9, the positive input terminal of comparator 9 is connected with the power supply that reference voltage is provided.
Operation principle: a pulse drive signal of being controlled by PWM, be sent to main switch element 2 from drive circuit 3, main switch element 2 is alternately turned on and off, electric current flows through at the armature winding of transformer 1.In the time that the armature winding of transformer 1 has electric current to flow through, electric current also flows through secondary winding and the input current state measurement circuit 6 of transformer 1; The capacitor 12 that the drive pulse signal of being controlled by PWM sending from drive circuit 3 is also correcting circuit 4 by the resistor 11 of correcting circuit 4 charges; Be similar to the principle of Fig. 2 embodiment, output voltage and the input voltage of correcting circuit 4 are inversely proportional to.In the time that input voltage increases, the output voltage of correcting circuit 4 reduces, the incoming level of the negative terminal of comparison circuit 9 remains unchanged, proofread and correct by output voltage detecting circuit 8 and correcting circuit 4, current status measuring circuit 6 will produce one with the electric current of transformer 1 primary side winding current opposite direction, make the induced field of transformer 1 primary side winding constant, do not change by the magnetic flux of transformer 1 primary side winding; Otherwise, in the time that input voltage reduces, the output voltage of correcting circuit 4 increases, the incoming level of the negative terminal of comparison circuit 9 remains unchanged, proofread and correct by output voltage detecting circuit 8 and correcting circuit 4, current status measuring circuit 6 will produce an electric current identical with transformer 1 primary side winding current direction, makes the induced field of transformer 1 primary side winding constant, does not change by the magnetic flux of transformer 1 primary side winding.Therefore the output voltage of the auxiliary winding of transformer 1 primary side keeps constant.
Claims (4)
1. one kind has the DC-DC transducer of input voltage compensation circuit, it is characterized in that: in DC-DC transducer, voltage status measuring circuit (5) or current status measuring circuit (6) are located at the primary side of transformer (1), main switch element (2) is connected on the armature winding of transformer (1), and the correcting circuit (4) in voltage status measuring circuit (5) or current status measuring circuit (6) and the control terminal of main switch element (2) are all connected on the output of drive circuit (3).
2. a kind of DC-DC transducer with input voltage compensation circuit according to claim 1, it is characterized in that: described correcting circuit (4) is composed in series by resistor (11) and capacitor (12), and correcting circuit (4) is connected on the output of drive circuit (3) by resistor (11).
3. a kind of DC-DC transducer with input voltage compensation circuit according to claim 1 and 2, it is characterized in that: described voltage status measuring circuit (5) comprises correcting circuit (4), boost voltage output circuit (7), voltage detecting circuit (8) and comparison circuit (9), voltage detecting circuit (8) is made up of two resistor in series, the output of one termination boost voltage output circuit (7) of voltage detecting circuit (8), the other end of voltage detecting circuit (8) is connected on the resistor (11) of correcting circuit (4) and the node of capacitor (12) series connection, the series connection node of two resistors in voltage detecting circuit (8) connects the negative input end of comparison circuit (9), the positive input terminal of comparison circuit (9) is connected with the power supply that reference voltage is provided.
4. a kind of DC-DC transducer with input voltage compensation circuit according to claim 1 and 2, it is characterized in that: described current status measuring circuit (6) comprises correcting circuit (4), voltage detecting circuit (8) and comparison circuit (9), one end of the voltage detecting circuit (8) being made up of two resistor in series is connected on the node between main switch element (2) and current sensing resistor (16), the other end of voltage detecting circuit (8) is connected on the resistor (11) of correcting circuit (4) and the node of capacitor (12) series connection, the series connection node of two resistors in voltage detecting circuit (8) connects the negative input end of comparison circuit (9), the positive input terminal of comparison circuit (9) is connected with the power supply that reference voltage is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420068772.4U CN203747654U (en) | 2014-02-18 | 2014-02-18 | DC-DC converter with input voltage compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420068772.4U CN203747654U (en) | 2014-02-18 | 2014-02-18 | DC-DC converter with input voltage compensation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203747654U true CN203747654U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420068772.4U Expired - Fee Related CN203747654U (en) | 2014-02-18 | 2014-02-18 | DC-DC converter with input voltage compensation circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660049A (en) * | 2014-02-18 | 2015-05-27 | 襄阳南车电气系统技术有限公司 | DC-DC converter with input voltage compensating circuit |
| CN106341046A (en) * | 2015-07-08 | 2017-01-18 | 英飞凌科技奥地利有限公司 | Input Voltage Detection for a Converter |
| CN109039070A (en) * | 2018-08-08 | 2018-12-18 | 深圳市德赛微电子技术有限公司 | A kind of BUCK type DCDC output constant current detection control circuit and method |
-
2014
- 2014-02-18 CN CN201420068772.4U patent/CN203747654U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660049A (en) * | 2014-02-18 | 2015-05-27 | 襄阳南车电气系统技术有限公司 | DC-DC converter with input voltage compensating circuit |
| CN106341046A (en) * | 2015-07-08 | 2017-01-18 | 英飞凌科技奥地利有限公司 | Input Voltage Detection for a Converter |
| CN106341046B (en) * | 2015-07-08 | 2019-06-14 | 英飞凌科技奥地利有限公司 | Input voltage measurement for converter |
| CN109039070A (en) * | 2018-08-08 | 2018-12-18 | 深圳市德赛微电子技术有限公司 | A kind of BUCK type DCDC output constant current detection control circuit and method |
| CN109039070B (en) * | 2018-08-08 | 2020-12-15 | 深圳市德赛微电子技术有限公司 | BUCK type DCDC output constant current detection control circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XIANGYANG CSR ELECTRIC MACHINERY CO., LTD. Free format text: FORMER OWNER: XIANGYANG CSR ELECTRICAL SYSTEM TECHNOLOGY CO., LTD. Effective date: 20150513 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150513 Address after: 441047 Xiangfan North Road, Hubei, No. 132 Changhong Patentee after: Xiangyang CSR Electric Machinery Co., Ltd. Address before: 441047 No. 359 mountain road, hi tech Development Zone, Hubei, Xiangfan Patentee before: XIANGYANG CSR ELECTRICAL SYSTEM TECHNOLOGY CO., LTD. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20170218 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |