CN201556108U - Load current control circuit and device - Google Patents
Load current control circuit and device Download PDFInfo
- Publication number
- CN201556108U CN201556108U CN2009202611625U CN200920261162U CN201556108U CN 201556108 U CN201556108 U CN 201556108U CN 2009202611625 U CN2009202611625 U CN 2009202611625U CN 200920261162 U CN200920261162 U CN 200920261162U CN 201556108 U CN201556108 U CN 201556108U
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- China
- Prior art keywords
- resistance
- operational amplifier
- load current
- current control
- port
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- 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.)
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Abstract
The utility model discloses a load current control circuit, which comprises a supply voltage VCC, a microprocessor comprising a port I/O1, a port I/O2 and a port I/O3, a load driving circuit connected to the port I/O1 of the microprocessor so as to input pulse width modulation signal, a voltage clamping circuit connected with the integrator circuit of the load driving circuit and comprising a transistor Q1, a transistor Q2 with the base electrode connected with the emitter of the transistor Q1, and a current detecting circuit connected between the transistor Q1 and the port I/O2 of the microprocessor. The utility model provides a load current control device as well. The load current control circuit and the device control the load current of household appliance through the microprocessor and the transistors.
Description
[technical field]
The utility model relates to a kind of control circuit, relates in particular to a kind of load current control circuit and device.
[background technology]
Reliability is the emphasis of household appliances research.Household appliances design at present is more and more higher to the requirement of safety, reliably working.A lot of household appliances all need the electric current of load is controlled accurately, no matter from energy-conservation angle or security standpoint all has very actively and realistic meanings.
[utility model content]
The technical problems to be solved in the utility model provides a kind of load current control circuit and device, by microprocessor and electric crystal the load current of household appliances is controlled.
The utility model provides a kind of load current control circuit, comprises supply voltage VCC; Microprocessor comprises port I/O1, port I/O2 and port I/O3; Load driving circuits is connected in the port I/O1 of described microprocessor, and the input pulse-width signal comprises the low-pass filter and the integrating circuit of series connection; Voltage clamping circuit is connected in the integrating circuit of described load driving circuits, comprises transistor Q1, and the collector of described transistor Q1 is connected in supply voltage VCC; Transistor Q2, its base stage is connected in the emitter of described transistor Q1; Current detection circuit is connected between the port I/O2 of the emitter of described transistor Q1 and described microprocessor; Press testing circuit, be connected between the port I/O3 of the collector of described transistor Q1 and described microprocessor.
The utility model also provides a kind of load current control device, and it comprises load current control circuit.
Load current control circuit provided by the utility model and device are controlled at load current within certain numerical value by microprocessor and electric crystal Q2, and the load current of electrical equipment is carried out the high control of reliability.
[description of drawings]
Fig. 1 is the module map of the utility model load current control circuit;
Fig. 2 is the circuit diagram of the utility model load current control circuit.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and embodiment of the present utility model:
Be illustrated in figure 1 as the module map of the utility model load current control circuit.This load current control circuit comprises supply voltage VCC, microprocessor MCU, load driving circuits 10, voltage clamping circuit 20, transistor Q2, current detection circuit 30 and voltage detecting circuit 40.Wherein, microprocessor MCU comprises port I/O1, port I/O2 and port I/O3.Load driving circuits 10 is connected in the port I/O1 of microprocessor, imports pulse-width signal, comprises the low-pass filter and the integrating circuit of series connection.Voltage clamping circuit 20 is connected in the integrating circuit of load driving circuits 10, comprises transistor Q1, and the collector of transistor Q1 is connected in supply voltage VCC.The base stage of transistor Q2 is connected in the emitter of transistor Q1.Current detection circuit 30 is connected between the port I/O2 of the emitter of transistor Q1 and microprocessor MCU.Voltage detecting circuit 40 is connected between the port I/O3 of the collector of transistor Q1 and microprocessor MCU.
Be illustrated in figure 2 as the circuit diagram of the utility model load current control circuit.In the present embodiment, load driving circuits 10 comprises resistance R 1, resistance R 2, resistance R 8, resistance R 9, capacitor C 1, capacitor C 3 and operational amplifier U1B.Wherein, resistance R 1 and capacitor C 3 are series between the port I/O1 of microprocessor MCU and the ground and form low-pass filter.One end of capacitor C 1 is connected between the inverting input of resistance R 2 and operational amplifier U1B.The other end of capacitor C 1 is connected in the output terminal of operational amplifier U1B.Resistance R 8 is connected between the in-phase input end and ground of operational amplifier U1B, and an end of resistance R 9 is connected between the in-phase input end of resistance R 8 and operational amplifier U1B.
Wherein, resistance R 2, capacitor C 1 is formed integrating circuit with operational amplifier U1B, introduces the voltage negative feedback signal of load at the in-phase input end of operational amplifier U1B, makes the output voltage of operational amplifier U1B with in-phase input signals for 1 and rp input signal following relation be arranged:
V in the formula
B(t) be expressed as the output voltage of operational amplifier U1B, V
InBe the node voltage of resistance R 2 with resistance R 1, V
RefIn-phase input end voltage for operational amplifier U1B.By formula as can be seen, when the load current increase causes voltage to raise, V
B(t) can raise accordingly, thereby the electric current of reduction Q2 collector has also just reduced load current.Avoid because microprocessor MCU causes damage to circuit and load when out of control.
In the present embodiment, voltage clamping circuit 20 also comprises resistance R 4, resistance R 5, resistance R 6 and capacitor C 2, wherein, resistance R 4 is connected between the output terminal of supply voltage VCC and operational amplifier U1B, resistance R 4 and R5 are series between supply voltage VCC and the ground, and capacitor C 2 is connected between the output terminal of the base stage of transistor Q1 and operational amplifier U1B.
This voltage clamping circuit 20 is clamped on a threshold values with the base voltage value of transistor Q2, so make the collector current of transistor Q2 by clamped at one below the current threshold, thereby realize the restriction of load current.
In the present embodiment, the emitter of transistor Q2 is connected in supply voltage VCC, and its collector is connected in voltage detecting circuit 30.
Current detection circuit 30 comprises resistance R 10, resistance R 13, resistance R 14 and operational amplifier U1A.Wherein, resistance R 10 is connected between the inverting input of the emitting stage of electric crystal Q2 and operational amplifier U1A.Resistance R 13 is connected between the output terminal of the inverting input of operational amplifier U1A and operational amplifier U1A.Resistance R 14 is connected between the port I/O2 of the output terminal of U1A and microprocessor.This current detection circuit 30 is a see-saw circuit, and load current signal is converted to the port I/O2 that voltage signal transfers to little processing MCU.Wherein, the magnitude of voltage that transfers to little processing MCU with the pass of load current is:
V in the formula
OFor transferring to the magnitude of voltage of little processing MCU, I
LBe load current, all the other parameters are constant.
In the present embodiment, voltage detecting circuit comprises resistance R 15, resistance R 16, capacitor C 4 and operational amplifier U1C.The inverting input of operational amplifier U1C is connected with output terminal.Between the collector of resistance R 15 connections and electric crystal Q2 and the in-phase input end of operational amplifier U1C.One end of capacitor C 4 is connected between the in-phase input end of resistance R 15 and operational amplifier U1C, and the other end is connected to ground.Resistance R 16 is connected between the port I/O3 of the output terminal of operational amplifier U1C and microprocessor.Wherein, resistance R 15, resistance R 16, capacitor C 4 formed voltage follower with operational amplifier U1C, and load voltage is transferred to the output terminal of operational amplifier U1C, transfers to microprocessor MCU port I/O3 by resistance R 16.
The utility model also provides a kind of load current control device, and it comprises this load current control circuit.
Load current control circuit provided by the utility model and device are controlled at load current within certain numerical value by microprocessor MCU and electric crystal Q2, and the load current of electrical equipment is carried out the high control of reliability.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. a load current control circuit comprises supply voltage VCC, it is characterized in that, also comprises:
Microprocessor comprises port I/O1, port I/O2 and port I/O3;
Load driving circuits is connected in the port I/O1 of described microprocessor, and the input pulse-width signal comprises the low-pass filter and the integrating circuit of series connection;
Voltage clamping circuit is connected in the integrating circuit of described load driving circuits, comprises transistor Q1, and the collector of described transistor Q1 is connected in supply voltage VCC;
Transistor Q2, its base stage is connected in the emitter of described transistor Q1;
Current detection circuit is connected between the port I/O2 of the emitter of described transistor Q1 and described microprocessor;
Voltage detecting circuit is connected between the port I/O3 of the collector of described transistor Q1 and described microprocessor.
2. load current control circuit according to claim 1 is characterized in that: the emitter of described transistor Q2 is connected in supply voltage VCC, and its collector is connected in described voltage detecting circuit.
3. load current control circuit according to claim 1, it is characterized in that: described load driving circuits comprises resistance R 1, capacitor C 3, resistance R 2, capacitor C 1 and operational amplifier U1B, wherein said resistance R 1 and capacitor C 3 are series at forms described low-pass filter between the port I/O1 of described single-chip microcomputer and the ground, described resistance R 2 capacitor C 1 are formed described integrating circuit with operational amplifier U1B, one end of described capacitor C 1 is connected between the inverting input of described resistance R 2 and described operational amplifier U1B, and the other end of described capacitor C 1 is connected in the output terminal of described operational amplifier U1B.
4. load current control circuit according to claim 3, it is characterized in that: described load driving circuits also comprises resistance R 8 and resistance R 9, described resistance R 8 is connected between the in-phase input end and ground of described operational amplifier U1B, and an end of described resistance R 9 is connected between the in-phase input end of described resistance R 8 and described operational amplifier U1B.
5. load current control circuit according to claim 1, it is characterized in that: described voltage clamping circuit also comprises resistance R 4, resistance R 5, resistance R 6 and capacitor C 2, wherein, described resistance R 4 is connected between the output terminal of described supply voltage VCC and described operational amplifier U1B, described resistance R 4 and R5 are series between described supply voltage VCC and the ground, and described capacitor C 2 is connected between the output terminal of the base stage of described transistor Q1 and described operational amplifier U1B.
6. load current control circuit according to claim 2 is characterized in that: described current detection circuit comprises resistance R 10, resistance R 13, resistance R 14 and operational amplifier U1A.
7. load current control circuit according to claim 6 is characterized in that: described resistance R 10 is connected between the inverting input of the emitting stage of described electric crystal Q2 and described operational amplifier U1A; Described resistance R 13 is connected between the output terminal of the inverting input of described operational amplifier U1A and described operational amplifier U1A; Described resistance R 14 is connected between the port I/O2 of the output terminal of described U1A and described microprocessor.
8. load current control circuit according to claim 2 is characterized in that: described voltage detecting circuit comprises resistance R 15, resistance R 16, capacitor C 4 and operational amplifier U1C.
9. load current control circuit according to claim 8 is characterized in that: the inverting input of described operational amplifier U1C is connected with output terminal; Between the collector of described resistance R 15 connections and described electric crystal Q2 and the in-phase input end of described operational amplifier U1C; One end of described capacitor C 4 is connected between the in-phase input end of described resistance R 15 and described operational amplifier U1C, and the other end is connected to ground; Described resistance R 16 is connected between the port I/O3 of the output terminal of described operational amplifier U1C and microprocessor.
10. a load current control device is characterized in that: comprise that claim 1 is to each described load current control circuit of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202611625U CN201556108U (en) | 2009-12-04 | 2009-12-04 | Load current control circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202611625U CN201556108U (en) | 2009-12-04 | 2009-12-04 | Load current control circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201556108U true CN201556108U (en) | 2010-08-18 |
Family
ID=42615796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202611625U Expired - Fee Related CN201556108U (en) | 2009-12-04 | 2009-12-04 | Load current control circuit and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201556108U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754801A (en) * | 2013-12-30 | 2015-07-01 | 宝星电器（上海）有限公司 | Low-power-consumption control method for electrical equipment in low-voltage power supply system |
| CN105717463A (en) * | 2012-06-21 | 2016-06-29 | 九尊城网络科技（深圳）有限公司 | Power supply load test apparatus |
-
2009
- 2009-12-04 CN CN2009202611625U patent/CN201556108U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717463A (en) * | 2012-06-21 | 2016-06-29 | 九尊城网络科技（深圳）有限公司 | Power supply load test apparatus |
| CN105717463B (en) * | 2012-06-21 | 2018-08-17 | 东莞市输变电工程公司 | Power source loads test device |
| CN104754801A (en) * | 2013-12-30 | 2015-07-01 | 宝星电器（上海）有限公司 | Low-power-consumption control method for electrical equipment in low-voltage power supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100818 Termination date: 20161204 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |