CN207625277U - A kind of current foldback circuit that Auto-reconnect connects - Google Patents
A kind of current foldback circuit that Auto-reconnect connects Download PDFInfo
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- CN207625277U CN207625277U CN201721766359.5U CN201721766359U CN207625277U CN 207625277 U CN207625277 U CN 207625277U CN 201721766359 U CN201721766359 U CN 201721766359U CN 207625277 U CN207625277 U CN 207625277U
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Abstract
The utility model is related to a kind of current foldback circuits that Auto-reconnect connects, including：Examine leakage resistance, comparator, reference voltage generator, negative pressure charge pump circuit, state control process circuit, power switch tube, switch triode, fly-wheel diode, filter capacitor.Reference voltage generator can be set according to current limit threshold size; it examines leakage resistance and carries out current sample; it is compared with reference voltage; when the electric current for flowing through inspection leakage resistance is more than the threshold value of setting; comparator exports high level; this level passes through state control process circuit; the running clock of negative pressure charge pump is set to stop; the grid voltage of power switch tube is VIN; power switch tube is off state, and VIN and VOUT is made to disconnect, and Simultaneous Switching triode is in the conduction state; it can make load repid discharge, reach protection load system purpose.
Description
Technical field
The utility model is related to electronic system field of power management, especially a kind of overcurrent threshold value is adjustable and can Auto-reconnect
The current foldback circuit connect.
Background technology
With the development of space technology and the needs of national defense safety, more and more electronic systems have been widely used for newly
In type satellite and all kinds of weaponrys, and some electronic systems are radiated in cosmic space by various high energy particles and ray
When, locking single particle effect is easy tod produce, high current is generated, electronic system damage, or even failure is in turn resulted in, brings serious
Economic loss.
There are mainly two types of patterns for existing current protection technology, the first is overcurrent freewheeling mode, is system load overcurrent
Afterwards, it can maintain to be supported under the maximum current set and work, such operating mode, which cannot allow, loads thorough power down；It is another
Kind is shutdown mode, this pattern uses power switch tube mode, and when system load overcurrent, power switch tube shutdown keeps system negative
It carries and is disconnected with power supply, the access cut off the power between system load reaches protection power source and the function of system load, but herein
Under kind operating mode, needs additional control excitation that power switch tube is made to be connected again, just system load can be made to connect again with power supply
It connects.
Space is communicated with terrestrial information so that system load is powered in time, thus need one kind can cut off the power with
Access between system load achievees the purpose that overcurrent protection to make system load be detached from locking single particle state, and can be
The function of being reconnected automatically after load break power supply loads normal operating conditions with recovery system.
Utility model content
The utility model aim is to provide a kind of current foldback circuit connect with Auto-reconnect, mainly solves system load
When locking, so that load power down is detached from lock-out state, load equipment is avoided to cause equipment damage problem because electric current is excessive,
Meanwhile and can reconnect in load by power supply automatically, so that load is reworked.
The utility model adopts the following technical solution：A kind of current foldback circuit that Auto-reconnect connects, including reference voltage
Generator, comparator, negative pressure charge pump circuit, state control process circuit, power switch tube P1, switch triode Q1；
The comparator is connect with reference voltage generator, state control process circuit, state control process circuit with it is negative
Charge pump circuit, switch triode Q1 connections, the power switch tube P1 is pressed to connect with negative pressure charge pump circuit, switch triode Q1
It connects.
The state control process circuit structure is as follows：The input terminal CMP of state control process circuit successively through resistance R7,
The output end OC of phase inverter INV1, diode D3, phase inverter INV2 to state control process circuit；Output end OC passes through resistance R5
For inverted device INV3 to D4 cathode terminals, D4 anode taps connect resistance R8；The input terminal EN of state control process circuit (004) is successively
Output end through resistance R8, phase inverter INV4, diode D6, phase inverter INV5, phase inverter INV6 to state control process circuit
CLK, the node between the D6 and INV5 are connect with INV6 by resistance R6, are grounded by capacitance C5, also by diode D5 with
Node connectedness between R7 and INV1；Node between INV3 input terminals and R5 is grounded by capacitance C4；
Power supply is successively through resistance R1, resistance R2, resistance R3, resistance R4, capacitance C3 ground connection, triode Q2 emitters and power supply
Connection, Node connectedness between base stage and R1 and R2, node passes through Node connectedness between diode D2 and INV4 and D6 between R2 and R3；Q2's
Collector is grounded by capacitance C2, the Node connectedness also between R7 and INV1；Node connectedness between node and INV1 and D3 between R3 and R4.
The output end of the input terminal CMP and comparator connects, and input terminal EN is for connecting ppu, output end OC
It is connect with Q1 base stages, output end CLK is connect with negative pressure charge pump circuit input terminal.
Overcurrent threshold value setting resistance Rrun, Rrun and input are connected between two input terminals of the reference voltage generator
Resistance Rstb ground connection is arranged by overcurrent threshold value in the node at end, and output end is connect with comparator input terminal.
Two input terminals of the comparator are respectively coupled to the both ends inspection leakage resistance R1, and external voltage input is connected to work(through R1
The source electrode of rate switching tube P1.
The grid of the power switch tube P1 is connect with the output end of negative pressure charge pump circuit, drain electrode and switch triode Q1
Collector connection, and as the voltage output end of current foldback circuit.
The emitter ground connection of the switch triode Q1, is parallel with diode D1 and capacitance C1 between collector and base stage.
Switch, control terminal and the state control of switch are connected between the output end and the source electrode of P1 of the negative pressure charge pump circuit
The output end OC connections of processing circuit processed.
The utility model has the following effects that and advantage：
1. the utility model provides a kind of current foldback circuit connect with Auto-reconnect, has and rapidly switch off and weigh automatically
The characteristics of new connection.
2. the overcurrent size of the utility model tool is adjustable, have adjustable range wide, the characteristics of having a wide range of application.
3. the utility model has system repid discharge characteristic, it can be used for capacitive load and inductive load.
4. the utility model provides overcurrent protection for the electronic system of locking single particle effect sensitivity, avoidable load is set
It is standby to be damaged because electric current is excessive.
It can be used in the complication system of multimode 5. the utility model uses, be connected between power supply and function module, press
It is protected according to function module.
Description of the drawings
There is Fig. 1 the utility model Auto-reconnect to connect overcurrent protection circuit block diagram；
The state control circuit schematic diagram of Fig. 2 the utility model；
The application schematic diagram of Fig. 3 the utility model；
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
A kind of current foldback circuit that Auto-reconnect connects, circuit structure include inspection leakage resistance R1, reference voltage generator
002, overcurrent threshold value setting resistance (Rstb, Rrun), comparator 001, negative pressure charge pump circuit 003, state control process circuit
004, power switch tube P1, switch triode Q1, sustained diode 1, filter capacitor C1, wherein：
Sample rate current is converted to and is adopted for being sampled to the electric current for flowing through the paths VIN to VOUT by the inspection leakage resistance
Sample control source comparator；The reference voltage generator is used to generate reference voltage, this voltage by the overcurrent threshold value set
Input reference voltage as comparator；The overcurrent threshold value setting resistance is for setting overcurrent threshold point.The comparator is used
In sampled voltage to be compared with reference voltage, when circuit works normally, sampled voltage is less than reference voltage, and comparator is defeated
Go out low level；When overcurrent occurs, sampled voltage is more than reference voltage, and comparator exports high level.The negative pressure charge pump is used
In generating negative pressure signal, power switch tube can be quickly opened.The state control process circuit includes for generating negative pressure charge
Control clock signal, the base control signal of output stage switch triode and the grid control signal of power switch tube of pump.Institute
State connecting valve of the power switch tube for VIN and the paths VOUT.The switch triode is used to carry out system load circuit
Repid discharge.The fly-wheel diode can be used for inductive load and discharge.The filter capacitor is for stablizing VOUT outputs.
Power switch tube is P-channel MOSFET, and grid control is provided by charge pump.Charge pump is negative pressure charge pump, defeated
Go out the gate terminal of voltage connection P-channel MOSFET.
State processing circuit is made of discrete device, and exports connection negative pressure charge pump and output switch triode.
State processing circuit structure includes resistance (R2, R3, R4, R5, R6), capacitance (C1, C2, C3, C4, C5), diode
(D2, D3, D4, D5, D6), phase inverter (INV1, INV2, INV3, INV4, INV5, INV6), triode (Q2).
State processing circuit includes 4 working conditions, non-enabled working condition, the non-over-current state of enabled work, overcurrent shape
State is reconnected after state and overcurrent.
The voltage of reference voltage generator is different according to electric threshold size.
The size of current threshold is set by the way that threshold resistance (Rstb, Rrun) is arranged.
Fig. 1 is a kind of current foldback circuit connect with Auto-reconnect of the utility model, as shown in Figure 1, including：Inspection stream
Resistance, comparator, reference voltage generator, negative pressure charge pump circuit, state control process circuit, power switch tube, switch three
Grade pipe, fly-wheel diode, filter capacitor.
Wherein reference voltage generator can generate corresponding reference voltage level according to presetting current threshold, this reference
Voltage is used to connect the inverting input of comparator.
The relationship of presetting current threshold and VIN and overcurrent threshold value setting resistance (Rstb, Rrun) is：Wherein Ith_stb、Ith_runFor presetting current threshold
Maximum value and minimum value, VIN are input voltage, Req=Rstb//Rrun.
Inspection leakage resistance is for sampling system load electric current, and the value after sampling is voltage value, for connecting comparator
In-phase input end.
Comparator is compared for reference voltage and sampled voltage, when system load electric current is less than the current threshold of setting
When, sampled voltage is less than reference voltage, and when system load electric current is more than the threshold current of setting, sampled voltage is more than with reference to electricity
Pressure, comparator export high level.
Negative pressure charge pump circuit connects the grid of power switch tube, this negative pressure value can make power switch for generating negative pressure
Pipe conducting is opened.
State control process circuit is used to generate the control clock of negative pressure charge pump and the base stage of output stage switch triode
Control, when overcurrent does not occur for system load, state control process circuit generates running clock and connects negative pressure charge pump, works as system
When overcurrent occurs for load, negative pressure charge pump clock stops, and power switch tube disconnects, and is that system load is discharged rapidly；Power switch
After pipe disconnects, state control process circuit is by internal state, after one section of delay time, when regenerating charge pump
Clock, control power switch tube conducting, makes power supply and system load reconnect.
Triode is switched to be used to carry out repid discharge to system load circuit, when overcurrent occurs for system, switching transistor
Conducting, when system load power end with ground communicate, make load circuit repid discharge, as load lock when, can be rapidly from lock
Determine state to detach.
Fly-wheel diode can be used for inductive load and discharge, and when system load is in inductive circuit, overcurrent protection occurs
Afterwards, due to inductance characteristic, current direction is constant, and induced voltage direction by fly-wheel diode generation circuit on the contrary, can prevent from feeling
It should press and system load is damaged.
Fig. 2 is a kind of state control process circuit diagram of the utility model, as shown in Fig. 2, state control process electricity
Road port is respectively：Comparison result input port CMP, enabled input port EN, over-current state mark output end mouth OC and clock
Output port CLK.
It is broadly divided into following 4 working conditions, the non-enabled working conditions of EN according to circuit function, EN enables the non-overcurrent of work
State, over-current state reconnect state after overcurrent.It is implemented as follows：
(1) the non-enabled working conditions of EN：When EN is low level, after this signal passes sequentially through INV4, D6, INV5, INV6,
CLK outputs are high level, and dead-beat clock, negative pressure charge pump can not work, and power tube shutdown, under this state, no current passes through
Leakage resistance is examined, comparator output voltage (CMP voltages) is low level.Simultaneously as power supply gives capacitance C3 by R1, R2, R3, R4
Charging, D3 input terminals are high level, and D3 conductings are low level by OC outputs after INV2, i.e., overcurrent protection does not occur.
(2) EN enables the non-over-current state of work：When EN is high level, this signal becomes low level by INV4, due to having
D6 and D2 effects, signal can not be propagated, at this point, C5, R6, INV5 and INV6 will generate clock oscillation, CLK exports square wave clock letter
Number, so that negative pressure charge pump, power tube is opened, power supply VIN is connected with system load, overcurrent does not such as occur, then comparator
Low level is exported, OC exports low level.
(3) over-current state：On the basis of (2), over-current phenomenon avoidance such as occurs, then comparator exports high level, is by D5
CLK exports high level, and clock stops oscillation, and negative pressure charge pump is closed, and power tube is made to turn off, and cuts off the power logical with the connection of load
Road, comparator output level become low level.INV1 exports low level in this state, and Q2 is made to open, and C2 charges to high level, this
When Q2, INV1, R3, R2, R1 form loop-locking state, INV1 output maintain low level, make under this state OC export high level.
(4) state is reconnected after overcurrent：On the basis of (3), OC output ends are charged by R5 to C4, when C4 is charged to
When high level, INV3 exports low level, and it is low level to force the input terminal of INV4 and D4, and INV4 exports high level, this high level
After signal is by D2, Q2 is closed, disconnects and loop-locking state is formed by Q2, INV1, R3, R2, R1, OC is finally made to export low electricity
Flat, circuit returns to state (2), and power supply VIN is made to be connected with system load, reaches reconnection purpose.
Fig. 3 show the application schematic diagram of the utility model, as shown in figure 3, the utility model can be used for answering for multi-load
In miscellaneous system, 005 is power-supply system, and the example of the utility model is 006 and 007, is connected on power supply and system load 008 and 009
Between, it is protected according to loading functional.The current foldback circuit of the utility model can be according to different loads, in power-supply system
Output end is used in parallel, is not limited to two quantity in Fig. 3, can be added quantity according to power-supply system fan-out capability.
Claims (8)
1. a kind of current foldback circuit that Auto-reconnect connects, it is characterised in that：Including reference voltage generator (002), comparator
(001), negative pressure charge pump circuit (003), state control process circuit (004), power switch tube P1, switch triode Q1；
The comparator (001) connect with reference voltage generator (002), state control process circuit (004), at state control
Reason circuit (004) is connect with negative pressure charge pump circuit (003), switch triode Q1, the power switch tube P1 and negative pressure charge
Pump circuit (003), switch triode Q1 connections.
2. the current foldback circuit that a kind of Auto-reconnect according to claim 1 connects, it is characterised in that the state control
Processing circuit (004) structure is as follows：The input terminal CMP of state control process circuit (004) is successively through resistance R7, phase inverter
The output end OC of INV1, diode D3, phase inverter INV2 to state control process circuit (004)；Output end OC passes through resistance R5
For inverted device INV3 to D4 cathode terminals, D4 anode taps connect resistance R8；The input terminal EN of state control process circuit (004) is successively
It is defeated to state control process circuit (004) through resistance R8, phase inverter INV4, diode D6, phase inverter INV5, phase inverter INV6
Outlet CLK, the node between the D6 and INV5 are connect with INV6 by resistance R6, are grounded by capacitance C5, and diode is also passed through
Node connectedness between D5 and R7 and INV1；Node between INV3 input terminals and R5 is grounded by capacitance C4；
Successively through resistance R1, resistance R2, resistance R3, resistance R4, capacitance C3 ground connection, triode Q2 emitters connect power supply with power supply
It connects, Node connectedness between base stage and R1 and R2, node passes through Node connectedness between diode D2 and INV4 and D6 between R2 and R3；The collection of Q2
Electrode is grounded by capacitance C2, the Node connectedness also between R7 and INV1；Node connectedness between node and INV1 and D3 between R3 and R4.
3. the current foldback circuit that a kind of Auto-reconnect according to claim 2 connects, it is characterised in that the input terminal CMP
It is connect with the output end of comparator (001), for connecting ppu, output end OC is connect input terminal EN with Q1 base stages, defeated
Outlet CLK is connect with negative pressure charge pump circuit (003) input terminal.
4. the current foldback circuit that a kind of Auto-reconnect according to claim 1 connects, it is characterised in that the reference voltage
The node that overcurrent threshold value setting resistance Rrun, Rrun and input terminal are connected between two input terminals of generator (002) passed through
Threshold value setting resistance Rstb ground connection is flowed, output end is connect with comparator (001) input terminal.
5. the current foldback circuit that a kind of Auto-reconnect according to claim 1 connects, it is characterised in that the comparator
(001) two input terminals are respectively coupled to the both ends inspection leakage resistance R1, and external voltage input is connected to power switch tube P1's through R1
Source electrode.
6. the current foldback circuit that a kind of Auto-reconnect according to claim 1 connects, it is characterised in that the power switch
The grid of pipe P1 is connect with the output end of negative pressure charge pump circuit (003), is drained and is connect with the collector of switch triode Q1, and
Voltage output end as current foldback circuit.
7. the current foldback circuit that a kind of Auto-reconnect according to claim 1 connects, it is characterised in that the switch three-level
The emitter of pipe Q1 is grounded, and diode D1 and capacitance C1 are parallel between collector and base stage.
8. the current foldback circuit that a kind of Auto-reconnect according to claim 1 connects, it is characterised in that the negative pressure charge
Switch, control terminal and the state control process circuit (004) of switch are connected between the output end and the source electrode of P1 of pump circuit (003)
Output end OC connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721766359.5U CN207625277U (en) | 2017-12-18 | 2017-12-18 | A kind of current foldback circuit that Auto-reconnect connects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721766359.5U CN207625277U (en) | 2017-12-18 | 2017-12-18 | A kind of current foldback circuit that Auto-reconnect connects |
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|---|---|
| CN207625277U true CN207625277U (en) | 2018-07-17 |
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ID=62820104
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721766359.5U Active CN207625277U (en) | 2017-12-18 | 2017-12-18 | A kind of current foldback circuit that Auto-reconnect connects |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525197A (en) * | 2018-11-28 | 2019-03-26 | 中国电子科技集团公司第四十七研究所 | Overriding high-precision rc oscillator |
| CN109637474A (en) * | 2018-12-19 | 2019-04-16 | 惠科股份有限公司 | Current foldback circuit and display device |
| CN110928391A (en) * | 2019-11-14 | 2020-03-27 | 西安海的电子科技有限公司 | Computer host monitoring method |
| CN117439013A (en) * | 2023-11-29 | 2024-01-23 | 无锡力芯微电子股份有限公司 | Load switch chip with rapid overvoltage response |
-
2017
- 2017-12-18 CN CN201721766359.5U patent/CN207625277U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525197A (en) * | 2018-11-28 | 2019-03-26 | 中国电子科技集团公司第四十七研究所 | Overriding high-precision rc oscillator |
| CN109525197B (en) * | 2018-11-28 | 2022-09-13 | 中国电子科技集团公司第四十七研究所 | High-precision RC oscillator capable of being modified and adjusted |
| CN109637474A (en) * | 2018-12-19 | 2019-04-16 | 惠科股份有限公司 | Current foldback circuit and display device |
| CN110928391A (en) * | 2019-11-14 | 2020-03-27 | 西安海的电子科技有限公司 | Computer host monitoring method |
| CN117439013A (en) * | 2023-11-29 | 2024-01-23 | 无锡力芯微电子股份有限公司 | Load switch chip with rapid overvoltage response |
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