CN204288035U - A kind of regulated power supply output terminal fictitious load control circuit - Google Patents
A kind of regulated power supply output terminal fictitious load control circuit Download PDFInfo
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- CN204288035U CN204288035U CN201420745003.3U CN201420745003U CN204288035U CN 204288035 U CN204288035 U CN 204288035U CN 201420745003 U CN201420745003 U CN 201420745003U CN 204288035 U CN204288035 U CN 204288035U
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- power supply
- regulated power
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Abstract
The utility model discloses a kind of regulated power supply output terminal fictitious load control circuit, comprise feedback circuit, described feedback circuit obtains the voltage of regulated power supply output terminal; Also comprise the control circuit that described regulated power supply output current is controlled, described control circuit is connected with described feedback circuit, when the voltage that described feedback circuit obtains regulated power supply output terminal is high voltage, the regulated power supply exported described in controlling exports the control signal of small area analysis, when the voltage that described feedback circuit obtains the output of regulated power supply output terminal is low-voltage, the regulated power supply exported described in controlling exports the control signal of big current.In the technical solution of the utility model, utilize the voltage levels inputted at the in-phase end of operation amplifier to produce different control signals, regulated power supply is exported and controls.Structure is simple, respond well.
Description
Technical field
The utility model relates to regulated power supply output terminal fictitious load control circuit.
Background technology
Fictitious load, be replacement terminal at a certain circuit (as amplifier) or electrical output terminal mouth, receiving the components and parts of electric power, parts or device can be called fictitious load.The requirement the most basic to fictitious load is and the power impedance matching that can bear.Usually debug or detect machine performance time Interim use informal load.
Electronic load is the one used in fictitious load widely, the principle of electronic load is the conduction amount (amount dutycycle size) controlling internal power MOSFET or transistor, dissipated power by power tube consumes the equipment of electric energy, it accurately can detect load voltage, accurate adjustment load current, can realize fictitious load short circuit, fictitious load is the resistive and capacitive of perception simultaneously, the capacitive load currents rise time.It is indispensable that the debugging of general Switching Power Supply detects.
In electronic measuring instrument industry, the reliability needs of electronic product carry out the test and validation work of various performance index in the design and manufaction stage.In today that electronic technology is growing, no matter be the electronic product exchanging input or direct current input, require that the voltage range of input is more and more wider, compatibility is also more and more stronger, this just need we can provide can for test various electronic product, output voltage can wide region regulate alternating current-direct current testing power supply.
As everyone knows, because testing power supply requires the non-constant width of output voltage range, time minimum, even requirement can export zero volts nearly, and Gao Shineng exports tens volts to a few hectovolt.And all have a minimum value due to the dutycycle of present most of chip, unconfinedly can not turn down, littlely will to close.Therefore, want to reach the very low burning voltage of output, fictitious load must be set at circuit output end.In addition, because the discontinuous meeting of inductive current causes output voltage unstable, now also need to arrange fictitious load.
Fictitious load is divided into resistance fictitious load and electronics fictitious load.Resistance fictitious load is fixed, when electric power output voltage is low, power consumption is little, but power consumption is large when output voltage height, heating is serious, relatively be applicable on the small-power power of some fixed voltages output, and not too applicable on relatively high power power supply or on the power supply of Width funtion range of adjustment, will be substituted gradually; Electronics fictitious load is made up of active devices such as metal-oxide-semiconductors usually, by controlling the size of current of the adjustable electronics fictitious load of voltage levels of metal-oxide-semiconductor grid, by different fictitious load control modes, thus fictitious load load current when low pressure can be made large, and load current is little when high pressure, both can make electric power output voltage steady operation, and there will not be again too high loss, affect service efficiency.
Utility model content
In order to solve the usual too complexity of control circuit adopting active device to control fictitious load size in the market, the shortcoming that stability is not high, the utility model provides a kind of regulated power supply and exports fictitious load control circuit.
The utility model is realize the technical scheme that above technical requirement adopts to be: a kind of regulated power supply output terminal fictitious load control circuit, comprises feedback circuit, and described feedback circuit obtains the voltage of regulated power supply output terminal; Also comprise the control circuit that described regulated power supply output current is controlled, described control circuit is connected with described feedback circuit, when the voltage that described feedback circuit obtains regulated power supply output terminal is high voltage, the regulated power supply exported described in controlling exports the control signal of small area analysis, when the voltage that described feedback circuit obtains the output of regulated power supply output terminal is low-voltage, the regulated power supply exported described in controlling exports the control signal of big current.
In the technical solution of the utility model, utilize the voltage levels inputted at the in-phase end of operation amplifier to produce different control signals, regulated power supply is exported and controls.Structure is simple, respond well.
Further, in above-mentioned regulated power supply output terminal fictitious load control circuit: described control circuit comprises operation amplifier U3, reference voltage VREF, divider resistance R5, divider resistance R6, controlling resistance R4;
Divider resistance R5 and divider resistance R6 is connected between reference voltage VREF and ground GND;
The tie point of divider resistance R5 and divider resistance R6 connects the in-phase end of described operational amplifier U3, and what the end of oppisite phase ground connection GND of operational amplifier U3, operational amplifier U3 exported is the control signal controlling controlled fictitious load;
Described control circuit R4 is when the voltage that described feedback circuit obtains regulated power supply output is high voltage and between the in-phase end being connected to operational amplifier U3 and ground, when the voltage that described feedback circuit obtains regulated power supply output is low-voltage, disconnect the connection with the in-phase end of operational amplifier U3.
Further, in above-mentioned regulated power supply output terminal fictitious load control circuit: described feedback circuit comprises sampling divider resistance R1, divider resistance R2, three terminal regulator U1, and photoelectrical coupler U2 and power supply VCC;
Described divider resistance R1 and divider resistance R2 is connected between regulated power supply output terminal and ground GND, described divider resistance R1 and the tie point of divider resistance R2 connect described three terminal regulator U1 reference edge, the negative electrode of described three terminal regulator U1 is connected with the former limit diode cathode of photoelectrical coupler U2, the plus earth of described three terminal regulator U1;
The former limit diode anode of described photoelectrical coupler U2 is connected with power supply VCC;
The emitter and collector paying limit triode of described photoelectrical coupler U2 is connected between the in-phase end of controlling resistance R4 and computing transformer.
Further, in above-mentioned regulated power supply output terminal fictitious load control circuit: be also provided with voltage stabilizing diode ZD1 in described feedback circuit, voltage stabilizing diode ZD1 is connected in parallel between three terminal regulator U1 reference edge and anode, and the anode of voltage stabilizing diode ZD1 is connected with the anode of three terminal regulator U1.
Further, in above-mentioned regulated power supply output terminal fictitious load control circuit: also comprise current-limiting resistance R3 in described feedback circuit, described current-limiting resistance R3 is connected between the former limit diode anode of power supply VCC and photoelectrical coupler U2.
Compared with the electronics fictitious load of the resistance fictitious load also comparatively commonly used now or control circuit complexity, the utility model has the following advantages:
1, economy, efficiency are high.
Because the utility model achieves the characteristic exporting fictitious load electric current and regulate with output voltage, the loss of regulated power supply when exporting high-pressure work is greatly reduced, not only save electricity consumption, raise the efficiency, the cooling requirements of regulated power supply is also greatly reduced simultaneously, while the saving electricity charge, the hardware cost of regulated power supply product is also made to reduce.
2, simple, reliable, failure rate is low.
Because the utility model is simple and convenient, device is few, and compared with the control circuit of other electronic load complexity, the probability that fault occurs reduces.And switch because the switching exporting fictitious load all have employed hardware circuit, switch speed quickly, therefore, it is possible to while improving product reliability, reduces the maintenance cost of product.
Below with reference to drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment schematic diagram.
Embodiment
As shown in Figure 1, the present embodiment is a control circuit controlled the output fictitious load of electronic product test adjustable DC power supply.In the present embodiment, adjustable DC output power of power supply is 3KW, exports DC voltage 0 ~ 80V adjustable, the maximum 50A of output current.Owing to adopting the circuit of the present embodiment, detecting that in the present embodiment, adjustable DC electric power output voltage adjustable extent is wider, therefore exporting the fictitious load circuit that have employed in the utility model and carried out the control exporting fictitious load.
As shown in Figure 1, the present embodiment comprises the feedback circuit feeding back to three terminal regulator reference edge from adjustable DC electric power output voltage end, and the control voltage comparator circuit of optical coupling secondary edges.Feedback circuit comprises sampling divider resistance R1, divider resistance R2, voltage stabilizing diode ZD1, three terminal regulator U1, power supply current-limiting resistance R3 and photoelectrical coupler U2; The reference edge R of three terminal regulator U1 and regulated power supply output voltage sampled voltage through divider resistance R1, the node after divider resistance R2 dividing potential drop, and being connected with the negative pole of zener diode ZD1; The negative electrode K of three terminal regulator is connected with the former limit diode cathode of photoelectrical coupler U2, the plus earth of three terminal regulator U1; The former limit diode anode of photoelectrical coupler U2 is connected with power supply VCC by power supply current-limiting resistance R3.
Control circuit comprises controlling resistance R4, divider resistance R5, divider resistance R6 and operational amplifier U3; Controlling resistance R4 one end ground connection, the other end is connected with photoelectrical coupler U2 secondary transistor emitter; Operational amplifier U3 end of oppisite phase ground connection, in-phase end is contacted to be connected with divider resistance R5 and divider resistance R6 and is a little connected.Photoelectrical coupler U2 secondary transistor collector is connected with operational amplifier U3 in-phase end, the output termination electronics fictitious load control end of operational amplifier U3.
In embodiment, a kind of regulated power supply output fictitious load control circuit divides two grades of controls, i.e. low pressure shelves and high pressure shelves, output voltage is lower than being low pressure shelves during 16V, export fictitious load electric current and be about 2A, output voltage is higher than being high pressure shelves time more than 16V (to 80V), export fictitious load electric current and be about 0.2A, concrete control principle is described below:
When regulated power supply output voltage OUT+ is below 16V, by sampling divider resistance R1, divider resistance R2 institute component voltage is not enough to make three terminal regulator U1 conducting, thus photoelectrical coupler U2 also fails conducting, photoelectrical coupler U2 secondary does not work, operational amplifier U3 in-phase end voltage is divider resistance R5 and divider resistance R6 institute component voltage, the control voltage LOAD-C of an electronics fictitious load is exported more afterwards with operational amplifier U3 end of oppisite phase, this control voltage by after controlling outside active device, be with fictitious load electric current to be about 2A.
When regulated power supply output voltage OUT+ reaches more than 16V, by sampling divider resistance R1, divider resistance voltage that R2 gets makes three terminal regulator U1 conducting, thus photoelectrical coupler U2 also will conducting, photoelectrical coupler U2 secondary triode ON, be equivalent to operational amplifier U3 in-phase end divider resistance R5, divider resistance R6 institute component voltage adds a load controlling resistance R4 over the ground, a namely resistance R4 in parallel on R6, drag down the in-phase end reference voltage of operational amplifier U3, by exporting the control voltage LOAD-C of the lower electronics fictitious load of original voltage of ratio more afterwards with operational amplifier U3 end of oppisite phase, this control voltage is passed through after outside active device control, be with fictitious load electric current to be about 0.2A.
In sum, a kind of regulated power supply of the utility model exports fictitious load control circuit by above embodiment, and the output current achieving the output fictitious load size of regulated power supply controls automatically.
Claims (5)
1. a regulated power supply output terminal fictitious load control circuit, comprises feedback circuit, and described feedback circuit obtains the voltage of regulated power supply output terminal; It is characterized in that: also comprise the control circuit that described regulated power supply output current is controlled, described control circuit is connected with described feedback circuit, when the voltage that described feedback circuit obtains regulated power supply output terminal is high voltage, the regulated power supply exported described in controlling exports the control signal of small area analysis, when the voltage that described feedback circuit obtains the output of regulated power supply output terminal is low-voltage, the regulated power supply exported described in controlling exports the control signal of big current.
2. regulated power supply output terminal fictitious load control circuit according to claim 1, is characterized in that: described control circuit comprises operation amplifier U3, reference voltage VREF, divider resistance R5, divider resistance R6, controlling resistance R4;
Divider resistance R5 and divider resistance R6 is connected between reference voltage VREF and ground GND;
The tie point of divider resistance R5 and divider resistance R6 connects the in-phase end of described operational amplifier U3, and what the end of oppisite phase ground connection GND of operational amplifier U3, operational amplifier U3 exported is the control signal controlling controlled fictitious load;
Described control circuit R4 is when the voltage that described feedback circuit obtains regulated power supply output is high voltage and between the in-phase end being connected to operational amplifier U3 and ground, when the voltage that described feedback circuit obtains regulated power supply output is low-voltage, disconnect the connection with the in-phase end of operational amplifier U3.
3. regulated power supply output terminal fictitious load control circuit according to claim 2, is characterized in that: described feedback circuit comprises sampling divider resistance R1, divider resistance R2, three terminal regulator U1, and photoelectrical coupler U2 and power supply VCC;
Described divider resistance R1 and divider resistance R2 is connected between regulated power supply output terminal and ground GND, described divider resistance R1 and the tie point of divider resistance R2 connect described three terminal regulator U1 reference edge, the negative electrode of described three terminal regulator U1 is connected with the former limit diode cathode of photoelectrical coupler U2, the plus earth of described three terminal regulator U1;
The former limit diode anode of described photoelectrical coupler U2 is connected with power supply VCC;
The emitter and collector paying limit triode of described photoelectrical coupler U2 is connected between the in-phase end of controlling resistance R4 and computing transformer.
4. regulated power supply output terminal fictitious load control circuit according to claim 3, it is characterized in that: in described feedback circuit, be also provided with voltage stabilizing diode ZD1, voltage stabilizing diode ZD1 is connected in parallel between three terminal regulator U1 reference edge and anode, and the anode of voltage stabilizing diode ZD1 is connected with the anode of three terminal regulator U1.
5. regulated power supply output terminal fictitious load control circuit according to claim 3, it is characterized in that: also comprise current-limiting resistance R3 in described feedback circuit, described current-limiting resistance R3 is connected between the former limit diode anode of power supply VCC and photoelectrical coupler U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745003.3U CN204288035U (en) | 2014-12-02 | 2014-12-02 | A kind of regulated power supply output terminal fictitious load control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745003.3U CN204288035U (en) | 2014-12-02 | 2014-12-02 | A kind of regulated power supply output terminal fictitious load control circuit |
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| CN204288035U true CN204288035U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420745003.3U Expired - Fee Related CN204288035U (en) | 2014-12-02 | 2014-12-02 | A kind of regulated power supply output terminal fictitious load control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947308A (en) * | 2018-01-04 | 2018-04-20 | 江苏索尔新能源科技股份有限公司 | Air-cooled charger dummy load circuit |
| CN112965003A (en) * | 2021-02-01 | 2021-06-15 | 佛山市博顿光电科技有限公司 | Power supply aging load circuit |
-
2014
- 2014-12-02 CN CN201420745003.3U patent/CN204288035U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947308A (en) * | 2018-01-04 | 2018-04-20 | 江苏索尔新能源科技股份有限公司 | Air-cooled charger dummy load circuit |
| CN112965003A (en) * | 2021-02-01 | 2021-06-15 | 佛山市博顿光电科技有限公司 | Power supply aging load circuit |
| CN112965003B (en) * | 2021-02-01 | 2024-04-30 | 佛山市博顿光电科技有限公司 | Power supply aging load circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 518000 Floors 1-3 and 1-5 of Block A, Block B2, Jinweiyuan Industrial Plant, Longshan District, Pingshan New District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Gold Power Technology Co., Ltd. Address before: 518000 Shenzhen, Guangdong, Pingshan new industrial zone, poly dragon hill area Jinwei Industrial Zone A 1 floor. Patentee before: Shenzhen Gold Power Technology Co., Ltd. |
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| CP02 | Change in the address of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20181202 |
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| CF01 | Termination of patent right due to non-payment of annual fee |