KR100730888B1 - Common-type power supply comprising a seperate voltage-sensing circuit to an each channel - Google Patents

Abstract

A COM-type power supply having a separate V(Voltage)-sensing circuit for each channel is provided to implement a power supply for high precision control at low cost by compensating DC voltage of a minute value outputted to each channel. A COM-type power supply having a separate V-sensing circuit for each channel includes a bridge rectifying unit(130), a voltage main rectifying unit(200), an output terminal(140), a signal sensing input terminal(160), a voltage sensing circuit(170), a reference voltage generation unit(180), and a control unit(190). The bridge rectifying unit(130) converts AC power applied to each of first and second output channels into DC power through bridge rectifying. A voltage main rectifying unit(200) controls DC voltage and current outputted to each channel. The output terminal(140) outputs the final DC power of each channel. The signal sensing input terminal(160) is connected to a load connected to an output terminal, and receives the output DC power. The voltage sensing circuit(170) senses the DC power inputted from the sensing input terminal(160), and removes inputted external noise. The voltage sensing circuit(170) stabilizes a distorted signal and performs final phase correction. The reference voltage generation unit(180) generates a constant voltage reference value to vary a DC voltage value outputted through each channel. The control unit(190) determines a final output voltage outputted to the output terminal by comparing a signal outputted from the reference voltage generation unit(180) with a signal outputted to the voltage sensing circuit(170). An output minus terminal of a first output channel and an output plus terminal of a second output channel are connected to a common terminal(150).

Description

COM-type power supply including independent voltage sensing circuit for each channel {COMMON-TYPE POWER SUPPLY COMPRISING A SEPERATE VOLTAGE-SENSING CIRCUIT TO AN EACH CHANNEL}

1 is a block diagram showing the configuration of a power supply according to an embodiment of the present invention;

2 is a specific circuit diagram of the power supply shown in FIG. 1;

3 is an apparatus diagram of an exemplary embodiment for measuring a value of an actual output voltage with respect to an input voltage when voltage compensation by voltage sensing is not performed;

4 is an apparatus diagram of a measurement embodiment for measuring a value of an actual output voltage with respect to an input voltage when voltage compensation by voltage sensing is performed according to the present invention. Explanation of symbols on the main parts of the drawings

100: power supply 110: AC input unit

120: transformer 130: bridge rectifier

140: output terminal 150: common terminal

160: sensing input terminal 170: voltage sensing circuit

180: reference voltage generation unit 190: control unit

200: voltage main rectifier 210: output voltage high speed stabilizer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply, and more particularly, to a power supply for outputting respective DC voltages through one or more channels, wherein each channel is provided with an independent voltage sensing circuit (V-sensing circuit). Relates to a power supply.

The power supply is a device for converting an external AC voltage into a direct current so that the system can be used stably. In recent years, there is an increasing need for a power supply system that provides a multi-channel DC output, that is, multiple outputs.

In the conventional case, a power supply composed of two isolated output channel structures for outputting two DC power sources, that is, a positive power supply and a negative power supply, has a controller that is 2 compared to a conventional single channel output power supply system. It had to be further provided by a ship, and a bias power supplied thereto had to be provided separately.

In other words, in the case of a high-precision power supply, if there is such an isolated output structure, a cost corresponding to twice the cost of the power supply of a short channel is generated.

In order to overcome this problem, in the multi-channel structure, when the structure is changed to a non-isolated common terminal (COM) method, the controller is solved with only one, so that the cost can be somewhat reduced.

However, in a structure in which two outputs of a power supply are connected in series, when current flows in one channel, the other channel is affected by interference, which causes a fine error value even though the actual current does not flow. .

The cause of such interference is a structure in which the output negative terminal of the positive power channel and the output positive terminal of the negative power channel are commonly connected internally (called a 'COM method'). Therefore, when current flows in the positive power channel side, a voltage drop occurs due to a contact capacity problem of the output terminal, and a measurement error occurs in the voltage and current sensing connected to the common terminal of the negative power source. Even if does not flow, a fine error value is generated.

In the case of a power supply used as a high-precision control power supply, even if an error occurs only 300mV, it is recognized as a huge number, and as a result, it is difficult to be used as a high-precision control power supply without overcoming the above-described problems.

The present invention provides a power supply for outputting respective DC voltages through one or more channels, wherein each output channel is connected to a common terminal (COM), and an independent voltage sensing circuit (V-sensing circuit) is provided for each channel. Accordingly, an object of the present invention is to provide a power supply capable of automatically compensating a DC voltage value output to each channel in real time and automatically compensating for a voltage value different from a preset voltage value.

In order to achieve the above object, a power supply according to an embodiment of the present invention is a COM-type power supply having first and second output channels, and the AC power is applied to each of the first and second output channels. A bridge rectifier for converting the signal into a direct current through the bridge rectification; A voltage main rectifier controlling the DC voltage and current actually output for each channel; An output terminal for outputting a final DC power for each channel; A signal sensing input terminal connected to a load source connected to the output terminal to receive the output DC power; A voltage sensing circuit which senses DC power input from the sensing input terminal, removes incoming external noise, stabilizes the distorted signal, and performs final phase correction; A reference voltage generator for generating a constant voltage reference value by itself in order to vary a DC voltage value output through each channel; And a control unit for comparing the signal output to the voltage sensing circuit and the signal output from the reference voltage generator to determine a final output voltage output to the output terminal, wherein the output negative terminal of the first output channel and In addition, the output plus (+) terminal of the second output channel is characterized in that the structure is connected in common.

In addition, an AC input unit for receiving AC power; A transformer for converting AC power input to the AC input unit into AC power suitable for first and second output channels, respectively; An output voltage high speed stabilization unit for realizing the stabilization of the final output voltage is further included.

The first output channel is a positive power channel for outputting a positive DC power, and the second output channel is a negative power channel for outputting a negative DC power. do.

In addition, the voltage main rectifier provided in the first output channel is provided with a P-channel MOSFET device as a main rectifying device, and the voltage main rectifier provided in the second output channel is provided with an N-channel MOSFET device as a main rectifying device. It is done.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a power supply according to an embodiment of the present invention. Referring to Figure 1, the power supply 100 according to an embodiment of the present invention, the AC input unit 110 for receiving an AC power; A transformer (120) for converting AC power input to the AC input unit into secondary power suitable for first and second output channels, respectively; A bridge rectifier 130 for converting the secondary power output for each channel into direct current through bridge rectification; A voltage main rectifier 200 for controlling a DC voltage and a current actually output for each channel; An output terminal 140 for outputting a final DC power for each channel; A signal sensing input terminal 160 connected to a load source connected to the output terminal to receive the output DC power; A voltage sensing circuit 170 for sensing DC power input from the sensing input terminal, removing external noise, stabilizing a distorted signal, and performing final phase correction; A reference voltage generator 180 for generating a constant voltage reference value by itself in order to vary a DC voltage value output through each channel; And a controller 190 comparing the signal output to the voltage sensing circuit with the signal output from the reference voltage generator to determine the final output voltage output to the output terminal.

In addition, the output voltage high speed stabilization unit 210 to implement the stabilization of the final output voltage is further included.

Here, in the exemplary embodiment of the present invention, the first output channel is a positive power channel for outputting a positive DC power, and the second output channel is a negative power for outputting a negative DC power. A) Power channel.

In addition, the embodiment of the present invention, as shown in the output negative terminal of the first output channel, that is, the positive (+) power channel, and the output plus ( The +) terminal is connected to the common terminal 150, that is, it is characterized in that the structure is connected inside.

AC power input through the AC input unit 110 is preferably a commercial AC voltage 110V or 220V, may be an AC power source having a different voltage.

This AC power is applied to the primary side winding of the transformer 120, which is converted into secondary side power suitable for the first and second output channels, respectively, through the secondary side winding of the transformer.

As such, the secondary power output for each channel is converted into direct current through the bridge rectifier 130 including the bridge diode rectifier 132 and the capacitor 134 independently provided for each channel.

That is, the secondary power output for each channel is full-wave rectified through the bridge diode rectifier, and the output power of the bridge diode rectifier is smoothed by the capacitor to output a current close to DC.

In addition, the embodiment of the present invention is provided with a voltage main rectifier 200 for controlling the voltage and current actually output for each channel.

At this time, the voltage main rectifier provided in the first output channel is provided with a P-channel MOSFET device as a main rectifying device as shown, and the voltage main rectifier provided in the second output channel is provided with an N-channel MOSFET device as shown. It is provided as a main rectifying element.

The voltage main rectifier 200 provided in each channel compares the signal output to the voltage sensing circuit 170 with the signal output to the reference voltage generator 180 and compares the final output voltage output to the output terminal. The output signal of the determining unit 190 is applied to compensate the value of the DC power output through each channel.

At this time, when the result of the comparison between the signal output to the voltage sensing circuit 170 and the signal output to the reference voltage generator 180 does not match each other through a comparator provided inside the control unit 190 The signal is provided to the output voltage high speed stabilization unit 210 to correct the value of the DC power output to the output terminal 140 of each channel.

Hereinafter, a detailed operation of the power supply according to the embodiment of the present invention will be described in detail with reference to FIG. 2. FIG. 2 is a detailed circuit diagram of the power supply shown in FIG. 1.

In the power supply 100 according to the embodiment of the present invention, as described above with reference to FIG. 1, AC power input through the AC input unit 110 is applied to the primary side winding of the transformer 120, thereby winding the secondary side of the transformer. Through the conversion to the secondary side power supply suitable for the first and second output channel, respectively.

Accordingly, as shown in FIG. 2, the AC power appropriately converted to the first and second output channels may be converted into a predetermined DC power through the bridge rectifier 130 provided on the first and second output channels, respectively. Is converted.

In this case, the bridge rectifier 130 is composed of a bridge diode rectifier and a capacitor, the secondary power output for each channel is passed through the bridge diode rectifier full-wave rectified, the output power of the bridge diode rectifier to the capacitor It is smoothed by this and outputs a current close to a direct current.

That is, the bridge rectifier 130 is full-wave rectified by the bridge full-wave rectification method of the secondary side AC voltage generated through the transformer 120 through the bridge diode rectifier, which is through the capacitor, that is, the primary rectifier capacitor DC pulsation voltage is output. In addition, as shown, a primary discharge resistor is further provided to naturally discharge the surplus power when the main power is cut off.

Here, the first output channel is a positive power channel for outputting a positive (+) DC power, the second output channel is a negative power channel for outputting a negative (-) DC power, shown As described above, the output negative terminal of the first output channel, that is, the positive power channel, and the output positive terminal of the second output channel, that is, the negative power channel, are connected to the common terminal 150. Characterized in that the structure is connected to.

The operation principle in the first output channel and the operation principle in the second output channel are the same, and according to whether the positive control output type (first output channel) or the negative control output format (second output channel) is shown in FIG. There is a difference in that the main rectifier elements provided in the voltage main rectifier are formed in different types as shown in FIG.

That is, as shown in the voltage main rectifier 200 provided in the first output channel, the P-channel MOSFET device is provided as a main rectifier, and the voltage main rectifier 200 provided in the second output channel is shown in FIG. Similarly, an N-channel MOSFET device is provided as the main rectifying device.

In describing the operation of the circuit illustrated in FIG. 2, the following description will be made based on the second output channel for convenience of description.

When the DC power is converted into a predetermined DC power through the bridge rectifier 130 formed on the second output channel side, the DC power is output to the output terminal through the voltage main rectifier 200 and connected to the output terminal 140. Is applied to the load.

Accordingly, the output DC power is fed back to the voltage sensing circuit 170 through the sensing input terminal 160 connected to the load source.

The voltage sensing circuit 170 includes a voltage sensing unit and a phase stabilizing unit as shown in the figure to sense DC power input through the sensing input terminal 160, remove external noise, and distort the signal. Stabilizes and performs phase correction.

In more detail, the voltage signal across the load flowing from the sensing input terminal 160 is input to the OP-AMP of the voltage sensing circuit 170 as shown, as a non-inverting input terminal of the OP-AMP The input of the sensing voltage is completed by the voltage distribution of the connected series resistors.

However, in this case, since the sensing voltage includes a distorted signal and noise components as input from a long distance, in order to filter and compensate for such noise components, each series resistor includes a ceramic capacitor and a resistor in parallel. do. That is, as a structure for feeding back the output of the OP-AMP through a non-inverting input terminal through a resistor, in order to minimize the noise component, a ceramic capacitor and a resistor connected in parallel and a ceramic capacitor connected in parallel to the resistor are provided. The final noise component is filtered.

As described above, the sensing output voltage generated from the OP-AMP passes through an impedance matching series resistor before being input to the controller 190. The series resistance is stabilized when the nodes connected to each other are close to 0V as compared with the voltage output from the reference voltage generator 180. That is, since the power supply based on stabilization is performed to the system, it is preferable that the series resistor uses a high precision resistor.

In addition, as described above, the phase stabilization unit serves to prevent oscillation at a time point when the voltage of the node connected to the reference voltage generator 180 is set to 0 V, which is a capacitor configured in parallel, that is, a ceramic capacitor. It is configured to include.

In addition, the second output channel side is provided with a reference voltage generator 180 for generating a constant voltage reference value by itself in order to vary the DC voltage value output through the second output channel.

The reference voltage generator 180 is a device that is responsible for output control of a common terminal (COM) type power supply, and generates a reference voltage.

The source generating the reference voltage may generate a reference voltage using a digital to analog converter (DAC) with precise resolution, and precisely control the voltage with a fixed resistor and a variable resistor to input the reference voltage. It can also be generated.

In addition, the reference voltage generated to minimize the influence from the impedance uses the buffer structure of the OP-AMP once more. In addition, the output of the OP-AMP passes through the aforementioned impedance matching series resistor before being input to the controller 190.

Accordingly, the controller 190 compares the DC voltage value sensed by the voltage sensing circuit 170 with the constant voltage reference value generated by the reference voltage generator 180, and when the compared values are the same, The main rectifier device provided in the voltage main rectifier 200 is stabilized to maintain the DC power output through the output terminal 140.

On the other hand, when the DC voltage value sensed by the voltage sensing circuit 170 is different from the constant voltage reference value generated by the reference voltage generator 180, a predetermined signal is provided through a comparator provided in the controller 190. The output voltage is provided to the high speed stabilization unit 210 to correct the value of the DC power output to the output terminal 140 of the second output channel.

As a result, since the DC power output to the output terminal 140 is compared with the reference value generated by being fed back through the sensing input terminal 170, continuous voltage compensation is performed in real time.

In other words, the outputs of the voltage sensing circuit 170 and the reference voltage generator 180 are compared with the voltage of the inverting input terminal of the OP-AMP. Since the inverting input terminal is substantially connected to the reference power supply of the circuit through the impedance resistor, the voltage of the non-inverting input terminal should be close to the reference voltage of the same circuit as that of the inverting pressure terminal, that is, a voltage close to 0 V. The OP-AMP performs an output operation so that the gate voltage of the main rectifier device of the voltage main rectifier 200 is amplified.

In addition, if the OP-AMP reacts too quickly, the voltage main rectifier 200 also reacts sensitively, so that the output voltage becomes unstable. It has a structure for feeding back.

In addition, the power supply has a fast response when the output voltage rises, but a slow response when falling. That is, as the responsiveness is slow, the OP-AMP of the controller 190 is exposed to the error output for a long time, and enters an unregulation state during this time. The output voltage high speed stabilization unit 210 is designed to operate when the output voltage falls, and at this time, the secondary side stabilizing capacitor is charged in parallel with the output terminal 140 and the common terminal 150. It is characterized in that it is provided to quickly discharge the amount of charge to minimize the unregulation state, and to make a normal regulation state.

That is, the output voltage is fastened through the output voltage high speed stabilization unit 210 to enable fast output voltage setting and measurement as a high precision power supply.

3 and 4 show device diagrams of an output voltage measurement embodiment for proving the effect of voltage compensation by output voltage sensing. 3 is a diagram illustrating an apparatus for measuring a value of an actual output voltage with respect to an input voltage when voltage compensation by voltage sensing is not performed, and FIG. 4 when voltage compensation by voltage sensing is performed according to the present invention. Device diagrams for measuring the value of the actual output voltage relative to the input voltage are respectively shown. For the sake of simplicity, only the output voltage for any one channel is measured.

First, in order to measure the actual output voltage when voltage compensation is not performed by voltage sensing, as shown in FIG. 3, the output terminal 140 of the power supply PS and the DMM (Digital Multi METER) may be loaded. ), Respectively. The output voltage output from the output terminal 140 of the power supply PS is applied to a load, and the voltage applied to the load is measured in the DMM. As shown in the figure, when a voltage of 10.001 V was supplied from the power supply, the voltage applied to the actual load was 9.598 V when voltage compensation by voltage sensing was not performed.

On the other hand, in order to measure the actual output voltage when the voltage compensation by the voltage sensing in accordance with the present invention, as shown in Figure 4, the voltage sensing of the sensing input terminal 160 and the load source (Load) of the power supply (PS) The cable (C) was connected. As shown in the figure, when a voltage of 10.001 V is supplied from the power supply, the voltage applied to the actual load source is found to be 10.002 V when voltage compensation by voltage sensing is performed. That is, it was confirmed that the voltage supplied from the power supply and the voltage measured by the DMM almost matched. The same results were obtained even in the repeated measurement under the same conditions. As such, it can be seen that the actual output voltage is stably compensated by the voltage sensing according to the present invention.

On the other hand, the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention It will be apparent to those skilled in the art.

According to the present invention, in the power supply for outputting each DC voltage through one or more channels, each output channel is connected to a common terminal (COM), the voltage sensing circuit (V-sensing) independent of each channel circuit), the DC voltage output to each channel can be compensated to a minute value (for example, 1㎶), and the same voltage is applied because the preset voltage is perfectly matched to the voltage applied to the end of the load. It can be supplied, and through this, a low cost high precision control power supply can be realized.

Claims (5)

A COM power supply having a first and a second output channel, A bridge rectifier for converting AC power applied for each of the first and second output channels into a direct current through bridge rectification; A voltage main rectifier controlling the DC voltage and current actually output for each channel; An output terminal for outputting a final DC power for each channel; A signal sensing input terminal connected to a load source connected to the output terminal to receive the output DC power; A voltage sensing circuit which senses DC power input from the sensing input terminal, removes incoming external noise, stabilizes the distorted signal, and performs final phase correction; A reference voltage generator for generating a constant voltage reference value by itself in order to vary a DC voltage value output through each channel; And a controller configured to compare the signal output to the voltage sensing circuit and the signal output from the reference voltage generator to determine a final output voltage output to the output terminal. And an output negative terminal of the first output channel and an output positive terminal of the second output channel in common. The method of claim 1, An AC input unit for receiving AC power; And a transformer for converting AC power input to the AC input unit into AC power suitable for the first and second output channels, respectively. The method of claim 1, The power supply further comprises an output voltage high speed stabilization unit for realizing the stabilization of the final output voltage. The method of claim 1, The first output channel is a positive power channel for outputting a positive (+) DC power, the second output channel is a negative power channel for outputting a negative (-) DC power Supply. The method of claim 4, wherein The voltage main rectifier provided in the first output channel is provided with a P-channel MOSFET element as the main rectifier, and the voltage main rectifier provided in the second output channel is provided with an N-channel MOSFET device as the main rectifier. Power supply.

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