CN208158452U - Isolated from power device - Google Patents
Isolated from power device Download PDFInfo
- Publication number
- CN208158452U CN208158452U CN201820372878.1U CN201820372878U CN208158452U CN 208158452 U CN208158452 U CN 208158452U CN 201820372878 U CN201820372878 U CN 201820372878U CN 208158452 U CN208158452 U CN 208158452U
- Authority
- CN
- China
- Prior art keywords
- input terminal
- switch unit
- operational amplifier
- connect
- isolated
- 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
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to a kind of isolated from power devices.Including voltage doubling rectifing circuit, operational amplifier and switch unit, switch unit includes input, output end and control terminal；One end of voltage doubling rectifing circuit and the positive supply input terminal of operational amplifier connect, the negative supply input terminal of operational amplifier is connect with the input terminal of the other end of voltage doubling rectifing circuit and switch unit respectively, the non-inverting input terminal of operational amplifier and the input terminal of switch unit connect, the inverting input terminal of operational amplifier and the output end of switch unit connect, and the output end of operational amplifier and the control terminal of switch unit connect.The isolated from power device is when the input terminal voltage of switch unit is higher than the output end voltage of switch unit, switching means conductive；When the output end voltage of switch unit is higher than the input terminal voltage of switch unit, switch unit shutdown；Operational amplifier is given to provide trigger voltage by voltage doubling rectifing circuit, operational amplifier control switch unit on-off again can reduce circuit fever.
Description
Technical field
The utility model relates to power electronics fields, more particularly to a kind of isolated from power device.
Background technique
The power supply of low-voltage and high-current is exported when carrying out double copies operation, needs to increase isolation electricity in power output end
Road, to ensure the flow direction of electric current, such as LED display power supply.
Traditional isolation circuit is made of Schottky diode, but this isolation circuit being made of Schottky diode
Calorific value is big when its work.
Utility model content
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of isolated from power device that can reduce fever.
A kind of isolated from power device, including voltage doubling rectifing circuit, operational amplifier and switch unit, switch unit include
Input, output end and control terminal；
One end of voltage doubling rectifing circuit and the positive supply input terminal of operational amplifier connect, and the negative supply of operational amplifier is defeated
Enter end to connect with the input terminal of the other end of voltage doubling rectifing circuit and switch unit respectively, the non-inverting input terminal of operational amplifier
It is connect with the input terminal of switch unit, the inverting input terminal of operational amplifier and the output end of switch unit connect, operation amplifier
The output end of device and the control terminal of switch unit connect.
Above-mentioned isolated from power device, including voltage doubling rectifing circuit, operational amplifier and switch unit, switch unit include
Input, output end and control terminal；One end of voltage doubling rectifing circuit and the positive supply input terminal of operational amplifier connect, and operation is put
The negative supply input terminal of big device is connect with the input terminal of the other end of voltage doubling rectifing circuit and switch unit respectively, operation amplifier
The non-inverting input terminal of device and the input terminal of switch unit connect, the inverting input terminal of operational amplifier and the output end of switch unit
Connection, the output end of operational amplifier and the control terminal of switch unit connect；When the input terminal voltage of switch unit is higher than switch
When the output end voltage of unit, switching means conductive；When the output end voltage of switch unit is higher than the input terminal electricity of switch unit
When pressure, switch unit shutdown；The isolated from power device provides trigger voltage, operation to operational amplifier by voltage doubling rectifing circuit
Amplifier according to the turn-on and turn-off of trigger voltage control switch unit, in this way can to avoid when diode-isolated because of forward voltage drop
Heating problem caused by big, can effectively reduce the calorific value of isolated from power device.
In one embodiment, the switch unit in isolated from power device includes metal-oxide-semiconductor, and source electrode and the operation of metal-oxide-semiconductor are put
The non-inverting input terminal connection of big device, the grid of metal-oxide-semiconductor and the output end of operational amplifier connect, the drain electrode of metal-oxide-semiconductor and the fortune
Calculate the inverting input terminal connection of amplifier.
In one embodiment, the operational amplifier in isolated from power device is LM2904 operational amplifier.
In one embodiment, isolated from power device further includes same phase resistance, and the non-inverting input terminal of operational amplifier passes through
It is connected with the input terminal of phase resistance and switch unit.
In one embodiment, the resistance that the same phase resistance in isolated from power device is 1 kilohm of resistance value.Implement at one
In example, isolated from power device further includes anti-phase resistance, and the inverting input terminal of operational amplifier passes through anti-phase resistance and switch unit
Output end connection.
In one embodiment, the resistance that the anti-phase resistance in isolated from power device is 1 kilohm of resistance value.
In one embodiment, voltage doubling rectifing circuit includes first input end, the second input terminal, the first output end and second
Output end, the first input end of voltage doubling rectifing circuit connects with an external times voltage source, the second input terminal of voltage doubling rectifing circuit and
External power supply connection, the first output end of voltage doubling rectifing circuit and the positive supply input terminal of operational amplifier connect, voltage multiplying rectifier
The second output terminal of circuit and the negative supply input terminal of operational amplifier connect.
In one embodiment, the voltage doubling rectifing circuit in isolated from power device includes first capacitor, the second capacitor, first
Diode and the second diode, one end of first capacitor are connect with an external times voltage source, and the other end of first capacitor is respectively with the
The anode of the cathode of one diode and the second diode connection, the anode of first diode respectively with the input terminal of switch unit
And external power supply connection, the cathode of the second diode are defeated with the positive supply of one end of the second capacitor and operational amplifier respectively
Enter end connection, the other end of the second capacitor and the input terminal of switch unit connect.
In one embodiment, first capacitor is ceramic disc capacitor in isolated from power device.
Detailed description of the invention
Fig. 1 is the structural block diagram of isolated from power device in one embodiment；
Fig. 2 is the structural block diagram of isolated from power device in another embodiment；
Fig. 3 is the circuit diagram of isolated from power device in one embodiment.
Specific embodiment
As shown in Figure 1, a kind of isolated from power device, including voltage doubling rectifing circuit 100, operational amplifier 200 and switch
Unit 300, switch unit 300 include input, output end and control terminal；
One end of voltage doubling rectifing circuit 100 is connect with the positive supply input terminal of operational amplifier 200, operational amplifier 200
Negative supply input terminal connect respectively with the input terminal of the other end of voltage doubling rectifing circuit 100 and switch unit 300, operation is put
The non-inverting input terminal of big device 200 is connect with the input terminal of switch unit 300, the inverting input terminal and switch of operational amplifier 200
The output end of unit 300 connects, and the output end of operational amplifier 200 is connect with the control terminal of switch unit 300.
Voltage doubling rectifing circuit 100 is used to provide trigger voltage to operational amplifier 200, and operational amplifier 200 receives triggering
Voltage, and turned off according to trigger voltage come the conducting of control switch unit 300, touching of the switch unit 300 in operational amplifier 200
Give on or off.In one embodiment, the switch unit 100 in the isolated from power device includes metal-oxide-semiconductor, metal-oxide-semiconductor
The connection of the non-inverting input terminal of source electrode and operational amplifier, the grid of metal-oxide-semiconductor and the output end of operational amplifier connect, metal-oxide-semiconductor
Drain electrode is connect with the inverting input terminal of the operational amplifier.When the source voltage of metal-oxide-semiconductor is higher than the drain voltage of metal-oxide-semiconductor,
Metal-oxide-semiconductor conducting；When the drain voltage of metal-oxide-semiconductor is higher than the source voltage of metal-oxide-semiconductor, metal-oxide-semiconductor shutdown.
Above-mentioned isolated from power device, including voltage doubling rectifing circuit 100, operational amplifier 200 and switch unit 300, are opened
Closing unit 300 includes input, output end and control terminal；One end of voltage doubling rectifing circuit 100 and the positive electricity of operational amplifier 200
Source input terminal connection, the negative supply input terminal of operational amplifier 200 respectively with the other end and switch of voltage doubling rectifing circuit 100
The input terminal of unit 300 connects, and the non-inverting input terminal of operational amplifier 200 is connect with the input terminal of switch unit 300, and operation is put
The inverting input terminal of big device 200 is connect with the output end of switch unit 300, the output end and switch unit of operational amplifier 200
300 control terminal connection；When the input terminal voltage of switch unit 300 is higher than the output end voltage of switch unit 300, switch is single
Member 300 is connected；When the output end voltage of switch unit 300 is higher than the input terminal voltage of switch unit 300, switch unit 300
Shutdown；The isolated from power device provides trigger voltage to operational amplifier by voltage doubling rectifing circuit, and operational amplifier is according to touching
Generate electricity the turn-on and turn-off of voltage-controlled switch unit processed, in this way can to avoid when diode-isolated because forward voltage drop it is big caused by generate heat
Problem can effectively reduce the calorific value of isolated from power device.
In one embodiment, the operational amplifier in isolated from power device is LM2904 operational amplifier.Operation amplifier
Device is with the circuit unit of very high-amplification-factor, it is a kind of amplifier with special Coupling circuit and feedback, output
Signal can be input signal and add, subtract or the result of the mathematical operations such as differential, integral.There are two input terminals for operational amplifier (instead
Phase input terminal and non-inverting input terminal) an and output end, when input voltage is added in inverting input terminal and common end, (common end is electricity
The point that pressure is zero, it is equivalent to the datum node in circuit) between, and its actual direction is higher than common end from inverting input terminal
When, output voltage actual direction is then directed toward output end from common end, i.e. the direction of the two is exactly the opposite；When input voltage is added in together
Between phase input terminal and common end, output voltage common end opposite with the actual direction of both input voltages is just identical.
LM2904 operational amplifier is encapsulated using SOIC (Small Outline Integrated Circuit, small outline integrated circuit)
Mode.
In one embodiment, isolated from power device further includes same phase resistance, and the non-inverting input terminal of operational amplifier passes through
It is connected with the input terminal of phase resistance and switch unit.In another embodiment, isolated from power device further includes anti-phase resistance, fortune
The inverting input terminal for calculating amplifier is connected by the output end of anti-phase resistance and switch unit.Integrated operational amplifier it is same mutually defeated
Enter end and inverting input terminal institute connecting resistance is equal, it is equal with phase resistance and anti-phase resistance, the difference inside operational amplifier can be made
Divide amplifier to be in equilibrium state, improves common-mode rejection ratio.Specifically, the same phase resistance in isolated from power device can be resistance value
1 kilohm of resistance, anti-phase resistance can be 1 kilohm of resistance value of resistance.
In one embodiment, voltage doubling rectifing circuit includes first input end, the second input terminal, the first output end and second
Output end, the first input end of voltage doubling rectifing circuit connects with an external times voltage source, the second input terminal of voltage doubling rectifing circuit and
External power supply connection, the first output end of voltage doubling rectifing circuit and the positive supply input terminal of operational amplifier connect, voltage multiplying rectifier
The second output terminal of circuit and the negative supply input terminal of operational amplifier connect, as shown in Figure 2.Voltage doubling rectifing circuit is put to operation
Big device provides trigger voltage, so as to be turned off by the conducting of operational amplifier control switch unit.
In one embodiment, the voltage doubling rectifing circuit in isolated from power device includes first capacitor, the second capacitor, first
Diode and the second diode, one end of first capacitor are connect with an external times voltage source, and the other end of first capacitor is respectively with the
The anode of the cathode of one diode and the second diode connection, the anode of first diode respectively with the input terminal of switch unit
And external power supply connection, the cathode of the second diode are defeated with the positive supply of one end of the second capacitor and operational amplifier respectively
Enter end connection, the other end of the second capacitor and the input terminal of switch unit connect.One end of first capacitor and external times voltage source
Connection, for example may be coupled to the winding output end of power source internal transformer, obtain a square-wave voltage；Pass through first capacitor reality
Existing multiplication of voltage obtains the confession of control unit power input using the current rectifying and wave filtering circuit that first diode and the second capacitor form
Piezoelectric voltage.Wherein, first capacitor and the second capacitor can be ceramic disc capacitor.
In one embodiment, isolated from power device circuit diagram as shown in figure 3, OR_S connection be the output of power supply just
End；AGND is the output negative terminal of power supply；Vout+ is the output end of isolated from power device.Come using the minimum metal-oxide-semiconductor Q3 of internal resistance real
Existing electric current can only flow to the output end of isolated from power device from the output plus terminal of power supply.The pole S of metal-oxide-semiconductor Q3 is connected to power supply output
The pole D of anode OR_S, Q3 are connected to the output end of isolated from power device, and the pole G of Q3 is by operational amplifier U7-A (model
LM2904 it) controls.When the S pole tension of metal-oxide-semiconductor Q3 is higher than D pole tension in figure, illustrate electric current forward flow, at this time operational amplifier
U7-A output HIGH voltage to the pole G of metal-oxide-semiconductor Q3, metal-oxide-semiconductor is connected.Because internal resistance very little, only 1 milliohm, so pressure is connected in metal-oxide-semiconductor
Very little is dropped, is lost very low.When the D pole tension of Q3 is higher than S pole tension, operational amplifier U7-A exports low-voltage to the G of metal-oxide-semiconductor
Pole, metal-oxide-semiconductor shutdown, prevents the reverse flow of electric current.
Operational amplifier U7-A realizes the above-mentioned action function, needs its 8 foot voltage 10V at least higher than OR_S voltage left
It is right.Obtaining the voltage of this 10V, there are many modes, for example use voltage doubling rectifing circuit shown in Fig. 3, the circuit include capacitor C1,
Diode D1, diode D2 and capacitor C2.One end of C1 is connected to one end of power source internal transformer, and D1 anode is connected to
The pole OR_S, D1 cathode are connected to the other end of C1；The anode of D2 is connected with the cathode of D1, and the cathode of D2 is connected to one end of C2,
And 8 feet of U7-A are connected to as U7-A power supply；The C2 other end is connected to the end OR_S.One end of C1 is connected to power source internal transformation
The winding output end of device obtains a square-wave voltage；By C1 realize multiplication of voltage, using D1, C2 form current rectifying and wave filtering circuit,
Obtain the supply voltage of about 10V or so；The circuit can obtain the level of 10V or so simply very as U7-A power supply.
Above-mentioned isolated from power device controls Q3 using the voltage difference at the pole the D pole-S both ends of operational amplifier detection metal-oxide-semiconductor Q3
G pole tension, realize electric current can only from S to D flow.It includes capacitor C1, diode D1, two poles that above-mentioned isolated from power device, which uses,
The voltage doubling rectifing circuit of pipe D2 and capacitor C2, D1 are connected to the end OR_S, and the power supply electricity of 10V or so can be obtained on C2
Pressure.Isolated from power device including metal-oxide-semiconductor, operational amplifier and voltage doubling rectifing circuit, generate heat small, high-efficient, circuit knot
Structure is simple and reliable, can solve the heating problem of conventional diode isolation.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of isolated from power device, which is characterized in that including voltage doubling rectifing circuit, operational amplifier and switch unit, institute
Stating switch unit includes input, output end and control terminal；
One end of the voltage doubling rectifing circuit is connect with the positive supply input terminal of the operational amplifier, the operational amplifier
Negative supply input terminal is connect with the input terminal of the other end of the voltage doubling rectifing circuit and the switch unit respectively, the fortune
The non-inverting input terminal for calculating amplifier is connect with the input terminal of the switch unit, the inverting input terminal of the operational amplifier and institute
The output end connection of switch unit is stated, the output end of the operational amplifier is connect with the control terminal of the switch unit.
2. isolated from power device according to claim 1, which is characterized in that the switch unit includes metal-oxide-semiconductor, described
The source electrode of metal-oxide-semiconductor is connect with the non-inverting input terminal of the operational amplifier, the grid of the metal-oxide-semiconductor and the operational amplifier
Output end connection, the drain electrode of the metal-oxide-semiconductor are connect with the inverting input terminal of the operational amplifier.
3. isolated from power device according to claim 1, which is characterized in that the operational amplifier is that LM2904 operation is put
Big device.
4. isolated from power device according to claim 1, which is characterized in that further include same phase resistance, the operation amplifier
The non-inverting input terminal of device is connect by the same phase resistance with the input terminal of the switch unit.
5. isolated from power device according to claim 4, which is characterized in that the same phase resistance is 1 kilohm of resistance value
Resistance.
6. isolated from power device according to claim 1, which is characterized in that it further include anti-phase resistance, the operation amplifier
The inverting input terminal of device is connect by the anti-phase resistance with the output end of the switch unit.
7. isolated from power device according to claim 6, which is characterized in that the anti-phase resistance is 1 kilohm of resistance value
Resistance.
8. isolated from power device according to claim 1, which is characterized in that the voltage doubling rectifing circuit includes the first input
End, the second input terminal, the first output end and second output terminal, the first input end of the voltage doubling rectifing circuit and external times piezoelectricity
Source connection, the second input terminal of the voltage doubling rectifing circuit are connect with external power supply, the first output of the voltage doubling rectifing circuit
End is connect with the positive supply input terminal of the operational amplifier, and the second output terminal of the voltage doubling rectifing circuit is put with the operation
The negative supply input terminal connection of big device.
9. isolated from power device according to claim 8, which is characterized in that the voltage doubling rectifing circuit further includes the first electricity
Appearance, the second capacitor, first diode and the second diode, one end of the first capacitor are connect with the outside times voltage source,
The other end of the first capacitor is connect with the anode of the cathode of the first diode and second diode respectively, institute
The anode for stating first diode is connect with the input terminal of the switch unit and the external power supply respectively, the two or two pole
The cathode of pipe is connect with the positive supply input terminal of one end of second capacitor and the operational amplifier respectively, and described second
The other end of capacitor is connect with the input terminal of the switch unit.
10. isolated from power device according to claim 9, which is characterized in that the first capacitor is ceramic disc capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820372878.1U CN208158452U (en) | 2018-03-15 | 2018-03-15 | Isolated from power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820372878.1U CN208158452U (en) | 2018-03-15 | 2018-03-15 | Isolated from power device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208158452U true CN208158452U (en) | 2018-11-27 |
Family
ID=64392068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820372878.1U Active CN208158452U (en) | 2018-03-15 | 2018-03-15 | Isolated from power device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208158452U (en) |
-
2018
- 2018-03-15 CN CN201820372878.1U patent/CN208158452U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105811761B (en) | A kind of BOOST circuit of current sampling circuit and integrated current sample circuit | |
| CN104374986B (en) | The electronic controller of breaker | |
| WO2016086897A1 (en) | Current zero-crossing detection circuit and method, and load voltage detection circuit and method | |
| CN109152156A (en) | A kind of constant current source driving circuit | |
| CN208158452U (en) | Isolated from power device | |
| CN106786462B (en) | A kind of amplifier switching mode overvoltage crowbar | |
| CN109557356A (en) | The current sampling circuit of isolated electrical energy transformer | |
| CN208890640U (en) | A kind of booster plate with high safety performance | |
| CN207442697U (en) | A kind of switching power circuit | |
| CN110139427A (en) | A kind of device and lamps and lanterns for closing emergency function | |
| CN203719790U (en) | NTC identification circuit with high return difference | |
| CN101895216A (en) | State switching circuit of wide-voltage switch | |
| CN205283507U (en) | Direct -current solid -state relay | |
| CN205320053U (en) | Quick break -make direct current solid state relay | |
| CN206542331U (en) | A kind of auto-excitation type anti exciting converter | |
| CN106950414A (en) | Metal-oxide-semiconductor current sampling circuit and push-pull circuit | |
| CN203251234U (en) | Switch power supply voltage stabilizing circuit | |
| CN203645895U (en) | Load sampling circuit of non-isolated LED driving circuit | |
| CN208739028U (en) | A kind of circuit of control negative pressure output | |
| CN201717796U (en) | Wide voltage switch state converting circuit | |
| CN205407768U (en) | Electronic switching circuit and metering device who makes with this circuit | |
| CN111294032A (en) | Electronic switch power supply device adopting series connection mode | |
| CN212875763U (en) | Light-operated single-phase three-wire plug | |
| CN203014367U (en) | Circuit device which inhibits input impulse current | |
| CN106922044A (en) | A kind of microwave oven supply power circuit and micro-wave oven |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Power supply isolation device and TD-SCDMA terminal Effective date of registration: 20190701 Granted publication date: 20181127 Pledgee: Bank of Communications Co., Ltd. Hunan Branch Pledgor: Changsha hang te Electronic Technology Co., Ltd. Registration number: 2019430000062 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20211102 Granted publication date: 20181127 Pledgee: Bank of Communications Co.,Ltd. Hunan Branch Pledgor: CHANGSHA HANGTE ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: 2019430000062 |