CN206820655U - A kind of chip high voltage power supply circuit - Google Patents
A kind of chip high voltage power supply circuit Download PDFInfo
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- CN206820655U CN206820655U CN201720751661.7U CN201720751661U CN206820655U CN 206820655 U CN206820655 U CN 206820655U CN 201720751661 U CN201720751661 U CN 201720751661U CN 206820655 U CN206820655 U CN 206820655U
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Abstract
The utility model discloses a kind of chip high voltage power supply circuit; including constant-current charging circuit, breaking circuit, linear voltage-stabilizing circuit, overvoltage crowbar; the constant-current charging circuit is connected with linear voltage-stabilizing circuit; the constant-current charging circuit is connected with the first voltage-regulator diode VZ1; the first voltage-regulator diode VZ1 is connected with breaking circuit; the breaking circuit is connected with overvoltage crowbar, and the overvoltage crowbar is connected with linear voltage-stabilizing circuit.The chip high voltage power supply circuit, charged by high voltage and constant current and charged to chip capacity, close this high voltage and constant current charging circuit after chip normal work, and input over-voltage protecting function can be realized.
Description
Technical field
The utility model belongs to electric power network technique field, and in particular to a kind of chip high voltage power supply circuit.
Background technology
Efficiency is one of Key Performance Indicator of Switching Power Supply, and the loss for reducing high-voltage power supply circuit itself is to improve effect
The important measures of rate, but the problem of larger is lost in existing high-voltage power supply circuit generally existing.Existing high-voltage power supply circuit is straight
Connect with it is rectified after AC-input voltage be connected, output supply current to LED chip power supply capacitor.Due to higher exchange
Input voltage and larger supply current cause the loss of high-voltage power supply circuit in itself larger.
In addition, in high-voltage power supply circuit, when ac input voltage drops to below supply voltage, in order to prevent power supply electricity
Hold to the anti-sink current in AC input end, one-way conduction is often realized using Diode series mode.But, because supply current is larger
Seeking the diode current flow area of series connection needs reverse leakage current and parasitic triode sufficiently large, while that also increase the diode
Influence, reduce the reliability of circuit.
Because input voltage is very high in AC power power supply circuit, in the situation for meeting to start the time when chip starts
Under, starting resistance loss can be very big, as shown in figure 1, R1 losses are very big.And voltage is being restarted repeatedly during input overvoltage protection,
Protecting effect is undesirable.
Utility model content
The purpose of this utility model is to provide a kind of chip high voltage power supply circuit, to solve to propose in above-mentioned background technology
The problem of.
To achieve the above object, the utility model provides following technical scheme：A kind of chip high voltage power supply circuit, including perseverance
Current charge circuit, breaking circuit, linear voltage-stabilizing circuit, overvoltage crowbar, the constant-current charging circuit and linear voltage-stabilizing circuit
Connection, the constant-current charging circuit are connected with the first voltage-regulator diode VZ1, the first voltage-regulator diode VZ1 and breaking circuit
Connection, the breaking circuit are connected with overvoltage crowbar, and the overvoltage crowbar is connected with linear voltage-stabilizing circuit.
Preferably, the constant-current charging circuit includes first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity
C1 and the first metal-oxide-semiconductor VT1, the first resistor R1 is in parallel with 3rd resistor R3, the first resistor R1 and the first metal-oxide-semiconductor VT1
Drain electrode connection, the second resistance R2 is connected with the first metal-oxide-semiconductor VT1 source electrode.
Preferably, the breaking circuit includes the 4th resistance R4, the 5th resistance R5 and the second metal-oxide-semiconductor VT2, and described second
Metal-oxide-semiconductor VT2 drain electrode respectively with 3rd resistor R3, the first metal-oxide-semiconductor VT1 grid, the first voltage-regulator diode VZ1 and the first electric capacity
C1 is electrically connected with, the 3rd resistor R3, the first metal-oxide-semiconductor VT1 grid, the first voltage-regulator diode VZ1 and the first electric capacity C1 phases
In parallel between mutually, the grid of the second metal-oxide-semiconductor VT2 is in parallel with the 4th resistance R4 and the 5th resistance R5 respectively.
Preferably, the overvoltage crowbar includes the second electric capacity C2, the 6th resistance R6, the 7th resistance R7, NPN triode
VT3 and diode VD1, parallel with one another between the second electric capacity C2, the 6th resistance R6 and the 7th resistance R7, the 6th resistance
R6 and the 7th resistance R7 and NPN triode VT3 base stage is electrically connected with, the colelctor electrode of the NPN triode VT3 and two two poles
Pipe VD1 is electrically connected with.
Preferably, the linear voltage-stabilizing circuit includes the 8th resistance R8, the 3rd electric capacity C3, the second NPN triode VT4, the
Two voltage-regulator diode VZ2, the second diode VD2 and battery E1, the 8th resistance R8 and diode VD1 are electrically connected with, described
8th resistance R8 and the second NPN triode VT4 colelctor electrode are electrically connected with, the base stage and second of the second NPN triode VT4
Voltage-regulator diode VZ2 is electrically connected with, the emitter stage of the second NPN triode VT4 and the second voltage-regulator diode VZ2 conduction terminal
It is electrically connected with, the 3rd electric capacity C3 and the second voltage-regulator diode VZ2 are in parallel, and the battery E1 electrically connects with constant-current charging circuit
Connect.
Technique effect of the present utility model and advantage：The chip high voltage power supply circuit, is charged to chip by high voltage and constant current
Electric capacity charges, and closes this high voltage and constant current charging circuit after chip normal work, and can realize input over-voltage protecting function.
Brief description of the drawings
Fig. 1 is a kind of chip high voltage power supply circuit of prior art.
Fig. 2 is circuit theory diagrams of the present utility model.
In figure：1 constant-current charging circuit, 2 breaking circuits, 3 linear voltage-stabilizing circuits, 4 overvoltage crowbars.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
The utility model provides a kind of chip high voltage power supply circuit as shown in Figure 2, including constant-current charging circuit 1, pass
Deenergizing 2, linear voltage-stabilizing circuit 3, overvoltage crowbar 4, the constant-current charging circuit 1 is connected with linear voltage-stabilizing circuit 3, described
Constant-current charging circuit 1 is connected with the first voltage-regulator diode VZ1, and the first voltage-regulator diode VZ1 is connected with breaking circuit 2, institute
State breaking circuit 2 to be connected with overvoltage crowbar 4, the overvoltage crowbar 4 is connected with linear voltage-stabilizing circuit 3, the constant current
Charging circuit 1 includes first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1 and the first metal-oxide-semiconductor VT1, and described the
One resistance R1 is in parallel with 3rd resistor R3, and the first resistor R1 is connected with the first metal-oxide-semiconductor VT1 drain electrode, the second resistance
R2 is connected with the first metal-oxide-semiconductor VT1 source electrode, and the breaking circuit 2 includes the 4th resistance R4, the 5th resistance R5 and the second metal-oxide-semiconductor
VT2, the second metal-oxide-semiconductor VT2 drain electrode respectively with 3rd resistor R3, the first metal-oxide-semiconductor VT1 grid, the first voltage-regulator diode
VZ1 and the first electric capacity C1 are electrically connected with, the 3rd resistor R3, the first metal-oxide-semiconductor VT1 grid, the first voltage-regulator diode VZ1 and
First electric capacity C1 is in parallel between each other, the grid of the second metal-oxide-semiconductor VT2 respectively with the 4th resistance R4 and the 5th resistance R5 simultaneously
Connection, the overvoltage crowbar 4 include the second electric capacity C2, the 6th resistance R6, the 7th resistance R7, NPN triode VT3 and diode
VD1, parallel with one another between the second electric capacity C2, the 6th resistance R6 and the 7th resistance R7, the electricity of the 6th resistance R6 and the 7th
The base stage for hindering R7 and NPN triode VT3 is electrically connected with, and the colelctor electrode of the NPN triode VT3 and two diode VD1 are electrical
Connection, the linear voltage-stabilizing circuit 3 include the 8th resistance R8, the 3rd electric capacity C3, the second NPN triode VT4, the pole of the second voltage stabilizing two
Pipe VZ2, the second diode VD2 and battery E1, the 8th resistance R8 and diode VD1 are electrically connected with, the 8th resistance R8
It is electrically connected with the second NPN triode VT4 colelctor electrode, base stage and the second voltage-regulator diode of the second NPN triode VT4
VZ2 is electrically connected with, and the emitter stage of the second NPN triode VT4 and the second voltage-regulator diode VZ2 conduction terminal are electrically connected with,
The 3rd electric capacity C3 and the second voltage-regulator diode VZ2 are in parallel, and the battery E1 is electrically connected with constant-current charging circuit 1.
Operation principle first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1 and the first metal-oxide-semiconductor VT1 compositions
Approximate constant-current charging circuit, charged to battery E1.When battery E1 voltages reach chip cut-in voltage, chip is started working,
There is normal voltage in VCC-1.4th resistance R4, the 5th resistance R5 and the second metal-oxide-semiconductor VT2 composition breaking circuits, VCC-1 are normally electric
The second metal-oxide-semiconductor VT2 is turned on after pressure output, and constant-current charging circuit is closed, and when ensureing normal work, damage is not present in this partial circuit
Consumption.8th resistance R8, the 3rd electric capacity C3, the second NPN triode VT4, the second voltage-regulator diode VZ2, the second diode VD2 and electricity
Pond E1 forms linear voltage-stabilizing circuit, ensures the stable power supply of chip.Second electric capacity C2, the 6th resistance R6, the 7th resistance R7, NPN
Triode VT3 and diode VD1 composition overvoltage crowbars, when inputting over-pressed, OVP voltage high level, NPN triode VT3
Conducting, constant-current charging circuit and linear voltage-stabilizing circuit are closed, chip unpowered, whole circuit is not working, and inputs over-pressed shape
After state disappears, circuit could normal work.
Finally it should be noted that：Preferred embodiment of the present utility model is the foregoing is only, is not limited to this
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it can still modify to the technical scheme described in foregoing embodiments, or to which part technical characteristic
Progress equivalent substitution, all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc.,
It should be included within the scope of protection of the utility model.
Claims (5)
1. a kind of chip high voltage power supply circuit, including constant-current charging circuit, breaking circuit, linear voltage-stabilizing circuit, overvoltage protection electricity
Road, it is characterised in that：The constant-current charging circuit is connected with linear voltage-stabilizing circuit, the constant-current charging circuit and the first voltage stabilizing two
Pole pipe VZ1 connections, the first voltage-regulator diode VZ1 are connected with breaking circuit, and the breaking circuit connects with overvoltage crowbar
Connect, the overvoltage crowbar is connected with linear voltage-stabilizing circuit.
A kind of 2. chip high voltage power supply circuit according to claim 1, it is characterised in that：The constant-current charging circuit includes
First resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1 and the first metal-oxide-semiconductor VT1, the first resistor R1 and
Three resistance R3 are in parallel, and the first resistor R1 is connected with the first metal-oxide-semiconductor VT1 drain electrode, the second resistance R2 and the first metal-oxide-semiconductor
VT1 source electrode connection.
A kind of 3. chip high voltage power supply circuit according to claim 1, it is characterised in that：The breaking circuit includes the 4th
Resistance R4, the 5th resistance R5 and the second metal-oxide-semiconductor VT2, the drain electrode of the second metal-oxide-semiconductor VT2 respectively with 3rd resistor R3, first
Metal-oxide-semiconductor VT1 grid, the first voltage-regulator diode VZ1 and the first electric capacity C1 are electrically connected with, the 3rd resistor R3, the first metal-oxide-semiconductor
VT1 grid, the first voltage-regulator diode VZ1 and the first electric capacity C1 are in parallel between each other, the grid point of the second metal-oxide-semiconductor VT2
It is not in parallel with the 4th resistance R4 and the 5th resistance R5.
A kind of 4. chip high voltage power supply circuit according to claim 1, it is characterised in that：The overvoltage crowbar includes
Second electric capacity C2, the 6th resistance R6, the 7th resistance R7, NPN triode VT3 and diode VD1, the second electric capacity C2, the 6th
It is parallel with one another between resistance R6 and the 7th resistance R7, the 6th resistance R6 and the 7th resistance R7 and NPN triode VT3 base stage
It is electrically connected with, the colelctor electrode of the NPN triode VT3 and two diode VD1 are electrically connected with.
A kind of 5. chip high voltage power supply circuit according to claim 1, it is characterised in that：The linear voltage-stabilizing circuit includes
8th resistance R8, the 3rd electric capacity C3, the second NPN triode VT4, the second voltage-regulator diode VZ2, the second diode VD2 and battery
E1, the 8th resistance R8 and diode VD1 are electrically connected with, the colelctor electrode of the 8th resistance R8 and the second NPN triode VT4
It is electrically connected with, base stage and the second voltage-regulator diode VZ2 of the second NPN triode VT4 are electrically connected with, the 2nd NPN tri-
Pole pipe VT4 emitter stage and the second voltage-regulator diode VZ2 conduction terminal are electrically connected with, the 3rd electric capacity C3 and the second voltage stabilizing two
Pole pipe VZ2 is in parallel, and the battery E1 is electrically connected with constant-current charging circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720751661.7U CN206820655U (en) | 2017-06-26 | 2017-06-26 | A kind of chip high voltage power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720751661.7U CN206820655U (en) | 2017-06-26 | 2017-06-26 | A kind of chip high voltage power supply circuit |
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| CN206820655U true CN206820655U (en) | 2017-12-29 |
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| CN201720751661.7U Active CN206820655U (en) | 2017-06-26 | 2017-06-26 | A kind of chip high voltage power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639145A (en) * | 2019-01-28 | 2019-04-16 | 安徽智训机器人技术有限公司 | Elevator card media system |
-
2017
- 2017-06-26 CN CN201720751661.7U patent/CN206820655U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639145A (en) * | 2019-01-28 | 2019-04-16 | 安徽智训机器人技术有限公司 | Elevator card media system |
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