CN215990738U - Ideal bridge control circuit - Google Patents
Ideal bridge control circuit Download PDFInfo
- Publication number
- CN215990738U CN215990738U CN202121128655.9U CN202121128655U CN215990738U CN 215990738 U CN215990738 U CN 215990738U CN 202121128655 U CN202121128655 U CN 202121128655U CN 215990738 U CN215990738 U CN 215990738U
- Authority
- CN
- China
- Prior art keywords
- control circuit
- ideal
- power supply
- ideal bridge
- filter capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Rectifiers (AREA)
Abstract
The utility model provides an ideal bridge control circuit, which has extremely low conduction loss, effectively reduces the energy consumption of products, is simple and reliable, and has higher economic value and practical value. The ideal bridge control circuit is connected with a power supply unit which utilizes a power supply VccSupplying power to an operational amplifier in the ideal bridge control circuit; the power supply unit comprises a rectifying and filtering circuit, a series voltage stabilizing circuit and a reference voltage Vref(ii) a The ideal bridge control circuit comprises an ideal bridge and a control circuit, and the ideal bridge control circuit compares the source electrode voltage and the drain electrode voltage of the power field effect transistor in real time by using an operational amplifier; the ideal bridge control circuit includes a power supply input PortAAnd PortBAnd an ideal bridge output port Vout(ii) a The ideal bridge comprises an N-type power field effect transistor Q1、Q2And a P-type power field effect transistor Q3、Q4(ii) a The control circuit comprises an operational amplifier AMP1、AMP2And a discrete component Q5、Q6、R4‑R9。
Description
Technical Field
The utility model belongs to the field of circuits, and particularly relates to an ideal bridge control circuit.
Background
The traditional rectifier bridge adopts a diode scheme, and even if a Schottky diode is adopted, the voltage drop of the rectifier bridge also reaches more than 1 volt. The traditional diode rectifier bridge has high conduction loss, low energy consumption cost performance of products, complex circuit and low economical efficiency and practicability.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides an ideal bridge control circuit which has extremely low conduction loss compared with the traditional diode rectifier bridge, effectively reduces the energy consumption of products, is simple and reliable, and has higher economic value and practical value.
The ideal bridge control circuit provided by the utility model is connected with a power supply unit, and the power supply unit utilizes a power supply source VccSupplying power to an operational amplifier in the ideal bridge control circuit;
the power supply unit comprises a rectifying and filtering circuit, a series voltage stabilizing circuit and a reference voltage Vref；
The ideal bridge control circuit also comprises an ideal bridge and a control circuit, and the ideal bridge control circuit compares the voltage of a source electrode and the voltage of a drain electrode of the power field effect transistor in real time by using an operational amplifier;
the ideal bridge control circuit comprises a power supply input PortAAnd PortBAnd an ideal bridge output port Vout；
An ideal bridge in the ideal bridge control circuit comprises an N-type power field effect transistor Q1、Q2And a P-type power field effect transistor Q3、Q4；
The control circuit in the ideal bridge control circuit comprises an operational amplifier AMP1、AMP2And a discrete component Q5、Q6、R4-R9。
One technical scheme of the utility model is further that the rectification and filtering circuit consists of a rectifier bridge and a filter capacitor C1Is obtained by parallel connection, one end of the rectifier bridge and the filter capacitor C1The other end of the rectifier bridge is connected with the filter capacitor C1Is connected with the negative electrode of the filter capacitor C1The negative electrode of (2) is grounded.
One embodiment of the present invention is further configured such that the series voltage stabilizationThe circuit comprises a voltage regulator tube ZD and a resistor R1Filter capacitor C2And an adjusting tube Q7Composition is carried out;
the filter capacitor C2Are connected in parallel with a resistor R2And R3Said resistance R2And R3Connected in parallel to the filter capacitor C after being connected in series2Said power supply source VccIs arranged on the adjusting pipe Q7Said reference voltage VrefIs arranged on the resistor R2And R3Said reference voltage Vref＝Vcc*R3/(R2+R3)。
In one embodiment of the utility model, the power supply input Port is further configured toAConnected with the junction of two diodes of the rectifier bridge, and the power supply input PortBAnd is connected with the junction of the other two diodes of the rectifier bridge.
In one embodiment of the present invention, the adjusting tube Q is further configured to7The base electrode of the voltage stabilizing tube ZD is connected with the negative electrode of the voltage stabilizing tube ZD, the positive electrode of the voltage stabilizing tube ZD is grounded, and the positive electrode of the voltage stabilizing tube ZD is connected with the filter capacitor C1Is connected with the negative electrode of the adjusting tube Q7Collector electrode of and the filter capacitor C1The positive electrode of the adjusting tube Q is connected with7And the filter capacitor C2Is connected with the positive pole of the filter capacitor C2The negative pole of the resistor R is grounded, and the resistor R is connected with the ground1Connecting the filter capacitor C1And the cathode of the voltage stabilizing tube ZD.
In one embodiment of the present invention, the ideal bridge control circuit includes an ideal bridge and a control circuit, and the power supply input Port is configured to receive the ideal bridge and the control circuitAIs arranged on the operational amplifier AMP1The negative pole of (1), the power supply input PortBIs arranged on the operational amplifier AMP2The negative pole of (2), the reference voltage VrefConnecting the operational amplifier AMP1、AMP2The positive electrode of (1).
The utility model has the beneficial effects that:
(1) the utility model can reliably control the rectifier bridge field effect transistor, compares the source electrode voltage and the drain electrode voltage of the field effect transistor in real time by using the operational amplifier, accurately monitors the current direction, realizes the reliable control of the rectifier bridge field effect transistor, reduces the voltage loss of an ideal bridge to about 60 millivolts, and effectively reduces the circuit loss.
(2) The utility model replaces the traditional rectifier bridge, has been practically applied to the application of the Ethernet power supply equipment, has higher practical value, has extremely low conduction loss compared with the traditional diode rectifier bridge, effectively reduces the energy consumption of products, has simple and reliable circuit, and has higher economic value and practical value.
(3) The utility model compares the input level and the output level of the power field effect transistor in real time by using the operational amplifier, accurately monitors the current direction of the rectifier bridge and realizes the reliable control of the rectifier bridge power field effect transistor.
Drawings
FIG. 1 is a schematic circuit diagram of a power supply unit according to the present invention;
FIG. 2 is a circuit diagram of an ideal bridge and control circuit according to the present invention.
Detailed Description
In order to facilitate an understanding of the utility model, the utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the utility model are shown, but which may be embodied in many different forms and are not limited to the embodiments described herein, but rather are provided for the purpose of providing a more thorough disclosure of the utility model.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The ideal bridge control circuit of the present invention is described in detail with reference to fig. 1 and 2.
The utility model provides an ideal bridge control circuit, which is connected with a power supply unit, wherein the power supply unit utilizes a power supply VccSupplying power to an operational amplifier in the ideal bridge control circuit; the power supply unit comprises a rectifying and filtering circuit, a series voltage stabilizing circuit and a reference voltage Vref(ii) a The ideal bridge control circuit also comprises an ideal bridge and a control circuit, and the ideal bridge control circuit compares the source electrode voltage and the drain electrode voltage of the power field effect transistor in real time by using the operational amplifier; the ideal bridge control circuit includes a power supply input PortAAnd PortBAnd an ideal bridge output port Vout(ii) a An ideal bridge in the ideal bridge control circuit comprises an N-type power field effect transistor Q1、Q2And a P-type power field effect transistor Q3、Q4(ii) a The control circuit in the ideal bridge control circuit comprises an operational amplifier AMP1、 AMP2And a discrete component Q5、Q6、R4-R9。
Specifically, the rectifying and filtering circuit consists of a rectifying bridge and a filtering capacitor C1Connected in parallel, one end of the rectifier bridge and the filter capacitor C1Is connected with the positive pole of the rectifier bridge, and the other end of the rectifier bridge is connected with the filter capacitor C1Is connected with the negative electrode of the filter capacitor C1The negative electrode of (2) is grounded.
Specifically, the series voltage stabilizing circuit comprises a voltage stabilizing tube ZD and a resistor R1Filter capacitor C2And an adjusting tube Q7Composition is carried out;
filter capacitor C2Are connected in parallel with a resistor R2And R3Resistance R2And R3Connected in parallel to the filter capacitor C after being connected in series2At both ends of the power supply VccIs arranged on the adjusting tube Q7Of the emitter, reference voltage VrefIs arranged on the resistor R2And R3Between, reference voltage Vref＝Vcc*R3/(R2+R3)。
In particular, the power supply input PortAConnected with the junction of two diodes of the rectifier bridge, and a power supply input PortBAnd is connected with the junction of the other two diodes of the rectifier bridge.
Specifically, the adjusting tube Q7The base electrode of the voltage stabilizing tube ZD is connected with the negative electrode of the voltage stabilizing tube ZD, the positive electrode of the voltage stabilizing tube ZD is grounded, and the positive electrode of the voltage stabilizing tube ZD is connected with the filter capacitor C1Is connected with the negative electrode of the adjusting tube Q7Collector and filter capacitor C1Is connected with the positive pole of the adjusting tube Q7Emitter and filter capacitor C2Is connected with the positive electrode of the filter capacitor C2The negative electrode of (3) is grounded, and a resistor R1Connecting filter capacitor C1And the cathode of the voltage stabilizing tube ZD.
Specifically, the ideal bridge control circuit comprises an ideal bridge, a control circuit and a power supply input PortAIs arranged in the operational amplifier AMP1Negative pole of (1), power supply input PortBIs arranged in the operational amplifier AMP2Negative pole of (1), reference voltage VrefConnecting an operational amplifier AMP1、AMP2The positive electrode of (1).
The control principle of the ideal bridge control circuit is as follows:
in an ideal bridge circuit, Q1-Q4The body diode of the rectifier circuit forms a full-bridge rectifier circuit, and before the control circuit does not act, the working characteristic of the rectifier circuit is consistent with that of a conventional diode rectifier bridge;
when working normally, the power supply input PortAVoltage and reference voltage VrefRespectively connected to the operational amplifiers AMP1Comparing the reference voltage VrefPort larger than power supply input PortAVoltage, operational amplifier AMP1Output high level, Q1(N-MOS) is conducted; at the same time, the user can select the desired position,operational amplifier AMP1Output high level pass resistor R8Make triode Q6Is turned on to thereby make Q4(P-MOS) on; meanwhile, the power supply input PortBVoltage and reference voltage VrefRespectively connected to the operational amplifiers AMP2Comparing, when the reference voltage Vref is less than the power supply input PortBVoltage, operational amplifier AMP2Output low level to make Q2、Q5、 Q3Respectively in a cut-off state;
otherwise, the power supply input PortBVoltage and reference voltage VrefRespectively connected to the operational amplifiers AMP2Comparing the reference voltage VrefPort larger than power supply input PortBOperational amplifier AMP2Output high level, Q2(N-MOS) is conducted; meanwhile, the operational amplifier AMP2Output high level pass resistor R9Make triode Q5Is turned on to thereby make Q3(P-MOS) on; meanwhile, the power supply input PortAVoltage and reference voltage VrefRespectively connected to an operational amplifier AMP1 for comparison when the reference voltage V isrefPort smaller than power supply input PortAOperational amplifier AMP1Output low level to make Q1、Q6、Q4Respectively in the off state.
In particular, the utility model relates to the internal resistance and reference voltage V of power field effect transistorrefSetting of (1):
for example, for the application of ethernet equipment, the internal resistance of MOSFET is usually 30 milliohm, and the reference voltage V is selectedrefSetting the load current to 30 millivolts, for example 1A, the voltage loss of the ideal bridge is 60 mV.
Under a certain load condition, the reference voltage VrefThe setting of (c) determines the lowest loss of the ideal bridge. Reference is also generally made to the selection of the internal resistance of the power fet.
Through the arrangement of the ideal bridge control circuit, the input level and the output level of the power field effect transistor are compared in real time by using the remote computing amplifier, the current direction of the rectifier bridge is accurately monitored, and the reliable control of the rectifier bridge power field effect transistor is realized. The voltage loss of the ideal bridge is reduced to about 60 millivolts, and the circuit loss is effectively reduced. The ideal bridge scheme has the advantages that the traditional rectifier bridge is replaced, the practical application is realized in the application of the Ethernet power supply equipment, the practical value is high, compared with the traditional diode rectifier bridge, the ideal bridge scheme has extremely low conduction loss, the energy consumption of products is effectively reduced, the circuit is simple and reliable, and the economic value and the practical value are high.
The above examples only express certain embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which are within the protection scope of the present invention; therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. The ideal bridge control circuit is characterized in that the ideal bridge control circuit is connected with a power supply unit, and the power supply unit utilizes a power supply source VccSupplying power to an operational amplifier in the ideal bridge control circuit;
the power supply unit comprises a rectifying and filtering circuit, a series voltage stabilizing circuit and a reference voltage Vref；
The ideal bridge control circuit also comprises an ideal bridge and a control circuit, and the ideal bridge control circuit compares the voltage of a source electrode and the voltage of a drain electrode of the power field effect transistor in real time by using an operational amplifier;
the ideal bridge control circuit comprises a power supply input PortAAnd PortBAnd an ideal bridge output port Vout；
An ideal bridge in the ideal bridge control circuit comprises an N-type power field effect transistor Q1、Q2And a P-type power field effect transistor Q3、Q4；
The control circuit in the ideal bridge control circuit comprises an operational amplifier AMP1、AMP2And a discrete component Q5、Q6、R4-R9。
2. The ideal bridge control circuit of claim 1, wherein the rectifying and filtering circuit is composed of a rectifying bridge and a filter capacitor C1Is obtained by parallel connection, one end of the rectifier bridge and the filter capacitor C1The other end of the rectifier bridge is connected with the filter capacitor C1Is connected with the negative electrode of the filter capacitor C1The negative electrode of (2) is grounded.
3. The ideal bridge control circuit of claim 2, wherein the series regulator circuit is composed of a voltage regulator tube ZD and a resistor R1Filter capacitor C2And an adjusting tube Q7Composition is carried out;
the filter capacitor C2Are connected in parallel with a resistor R2And R3Said resistance R2And R3Connected in parallel to the filter capacitor C after being connected in series2Said power supply source VccIs arranged on the adjusting pipe Q7Said reference voltage VrefIs arranged on the resistor R2And R3Said reference voltage Vref＝Vcc*R3/(R2+R3)。
4. The ideal bridge control circuit of claim 3, wherein the supply input Port PortAConnected with the junction of two diodes of the rectifier bridge, and the power supply input PortBAnd is connected with the junction of the other two diodes of the rectifier bridge.
5. The ideal bridge control circuit of claim 4, wherein the tuning transistor Q7The base electrode of the voltage stabilizing tube ZD is connected with the negative electrode of the voltage stabilizing tube ZD, the positive electrode of the voltage stabilizing tube ZD is grounded, and the positive electrode of the voltage stabilizing tube ZD is connected with the filter capacitor C1Is connected with the negative electrode of the adjusting tube Q7Collector electrode of and the filter capacitor C1Is connected with the positive electrode ofAdjusting tube Q7And the filter capacitor C2Is connected with the positive pole of the filter capacitor C2The negative pole of the resistor R is grounded, and the resistor R is connected with the ground1Connecting the filter capacitor C1And the cathode of the voltage stabilizing tube ZD.
6. The ideal bridge control circuit of claim 5, wherein the ideal bridge control circuit comprises an ideal bridge and a control circuit, and the power supply input Port isAIs arranged on the operational amplifier AMP1The negative pole of (1), the power supply input PortBIs arranged on the operational amplifier AMP2The negative pole of (2), the reference voltage VrefConnecting the operational amplifier AMP1、AMP2The positive electrode of (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121128655.9U CN215990738U (en) | 2021-05-24 | 2021-05-24 | Ideal bridge control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121128655.9U CN215990738U (en) | 2021-05-24 | 2021-05-24 | Ideal bridge control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215990738U true CN215990738U (en) | 2022-03-08 |
Family
ID=80513311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121128655.9U Active CN215990738U (en) | 2021-05-24 | 2021-05-24 | Ideal bridge control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215990738U (en) |
-
2021
- 2021-05-24 CN CN202121128655.9U patent/CN215990738U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103269550B (en) | LED ((Light Emitting Diode) current ripple elimination driving circuit | |
| CN101552560B (en) | Switch voltage stabilizing circuit and control method thereof | |
| CN206759147U (en) | Power supply switch circuit and power circuit | |
| CN104253957B (en) | The constant current of low-power consumption and backlight control circuit and television set | |
| CN111432528A (en) | L ED driving power supply and controller thereof | |
| CN103280765A (en) | Overvoltage protection circuit | |
| CN203301611U (en) | Direct-current switching circuit and switching power source | |
| US10381928B2 (en) | Voltage regulator and method for operating a voltage regulator | |
| CN106505526B (en) | One kind being used for motor-driven high-end over-current protection circuit topological structure | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN215990738U (en) | Ideal bridge control circuit | |
| CN203673378U (en) | Low-dropout direct-current stabilized power supply circuit | |
| CN208861199U (en) | A kind of multilevel decompression voltage regulator circuit with clamper function | |
| CN204993098U (en) | Computer adapter power | |
| CN205791623U (en) | Charge port protector | |
| CN108206550A (en) | High pressure lithium battery BMS power supply circuits | |
| CN211046482U (en) | Anti-reverse circuit of large-current power supply end | |
| CN205750611U (en) | A kind of regulator control circuit | |
| CN210167964U (en) | Direct current surge driving circuit | |
| CN210669882U (en) | Vienna topology driven auxiliary power supply circuit | |
| CN215120605U (en) | Wide input voltage stabilized power supply circuit | |
| CN104243876B (en) | The constant-current control circuit and television set of low-power consumption | |
| CN209593289U (en) | Buck-Boost circuit | |
| CN215817926U (en) | Switching circuit for low voltage of LDO (low dropout regulator) non-differential input voltage | |
| CN216387198U (en) | Overcurrent detection circuit and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |